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-rw-r--r--patch/ipc/IPCClient.c67
-rw-r--r--patch/ipc/IPCClient.h62
-rw-r--r--patch/ipc/dwm-msg.c549
-rw-r--r--patch/ipc/ipc.c1202
-rw-r--r--patch/ipc/ipc.h320
-rw-r--r--patch/ipc/util.c136
-rw-r--r--patch/ipc/util.h5
-rw-r--r--patch/ipc/yajl_dumps.c356
-rw-r--r--patch/ipc/yajl_dumps.h66
9 files changed, 2763 insertions, 0 deletions
diff --git a/patch/ipc/IPCClient.c b/patch/ipc/IPCClient.c
new file mode 100644
index 0000000..a157513
--- /dev/null
+++ b/patch/ipc/IPCClient.c
@@ -0,0 +1,67 @@
+#include "IPCClient.h"
+
+#include <string.h>
+#include <sys/epoll.h>
+
+#include "util.h"
+
+IPCClient *
+ipc_client_new(int fd)
+{
+ IPCClient *c = (IPCClient *)malloc(sizeof(IPCClient));
+
+ if (c == NULL) return NULL;
+
+ // Initialize struct
+ memset(&c->event, 0, sizeof(struct epoll_event));
+
+ c->buffer_size = 0;
+ c->buffer = NULL;
+ c->fd = fd;
+ c->event.data.fd = fd;
+ c->next = NULL;
+ c->prev = NULL;
+ c->subscriptions = 0;
+
+ return c;
+}
+
+void
+ipc_list_add_client(IPCClientList *list, IPCClient *nc)
+{
+ DEBUG("Adding client with fd %d to list\n", nc->fd);
+
+ if (*list == NULL) {
+ // List is empty, point list at first client
+ *list = nc;
+ } else {
+ IPCClient *c;
+ // Go to last client in list
+ for (c = *list; c && c->next; c = c->next)
+ ;
+ c->next = nc;
+ nc->prev = c;
+ }
+}
+
+void
+ipc_list_remove_client(IPCClientList *list, IPCClient *c)
+{
+ IPCClient *cprev = c->prev;
+ IPCClient *cnext = c->next;
+
+ if (cprev != NULL) cprev->next = c->next;
+ if (cnext != NULL) cnext->prev = c->prev;
+ if (c == *list) *list = c->next;
+}
+
+IPCClient *
+ipc_list_get_client(IPCClientList list, int fd)
+{
+ for (IPCClient *c = list; c; c = c->next) {
+ if (c->fd == fd) return c;
+ }
+
+ return NULL;
+}
+
diff --git a/patch/ipc/IPCClient.h b/patch/ipc/IPCClient.h
new file mode 100644
index 0000000..ee93030
--- /dev/null
+++ b/patch/ipc/IPCClient.h
@@ -0,0 +1,62 @@
+#ifndef IPC_CLIENT_H_
+#define IPC_CLIENT_H_
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/epoll.h>
+
+typedef struct IPCClient IPCClient;
+/**
+ * This structure contains the details of an IPC Client and pointers for a
+ * linked list
+ */
+struct IPCClient {
+ int fd;
+ int subscriptions;
+
+ char *buffer;
+ uint32_t buffer_size;
+
+ struct epoll_event event;
+ IPCClient *next;
+ IPCClient *prev;
+};
+
+typedef IPCClient *IPCClientList;
+
+/**
+ * Allocate memory for new IPCClient with the specified file descriptor and
+ * initialize struct.
+ *
+ * @param fd File descriptor of IPC client
+ *
+ * @return Address to allocated IPCClient struct
+ */
+IPCClient *ipc_client_new(int fd);
+
+/**
+ * Add an IPC Client to the specified list
+ *
+ * @param list Address of the list to add the client to
+ * @param nc Address of the IPCClient
+ */
+void ipc_list_add_client(IPCClientList *list, IPCClient *nc);
+
+/**
+ * Remove an IPCClient from the specified list
+ *
+ * @param list Address of the list to remove the client from
+ * @param c Address of the IPCClient
+ */
+void ipc_list_remove_client(IPCClientList *list, IPCClient *c);
+
+/**
+ * Get an IPCClient from the specified IPCClient list
+ *
+ * @param list List to remove the client from
+ * @param fd File descriptor of the IPCClient
+ */
+IPCClient *ipc_list_get_client(IPCClientList list, int fd);
+
+#endif // IPC_CLIENT_H_
+
diff --git a/patch/ipc/dwm-msg.c b/patch/ipc/dwm-msg.c
new file mode 100644
index 0000000..ca1e1a4
--- /dev/null
+++ b/patch/ipc/dwm-msg.c
@@ -0,0 +1,549 @@
+#include <ctype.h>
+#include <errno.h>
+#include <inttypes.h>
+#include <stdarg.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <unistd.h>
+#include <yajl/yajl_gen.h>
+
+#define IPC_MAGIC "DWM-IPC"
+// clang-format off
+#define IPC_MAGIC_ARR { 'D', 'W', 'M', '-', 'I', 'P', 'C' }
+// clang-format on
+#define IPC_MAGIC_LEN 7 // Not including null char
+
+#define IPC_EVENT_TAG_CHANGE "tag_change_event"
+#define IPC_EVENT_CLIENT_FOCUS_CHANGE "client_focus_change_event"
+#define IPC_EVENT_LAYOUT_CHANGE "layout_change_event"
+#define IPC_EVENT_MONITOR_FOCUS_CHANGE "monitor_focus_change_event"
+#define IPC_EVENT_FOCUSED_TITLE_CHANGE "focused_title_change_event"
+#define IPC_EVENT_FOCUSED_STATE_CHANGE "focused_state_change_event"
+
+#define YSTR(str) yajl_gen_string(gen, (unsigned char *)str, strlen(str))
+#define YINT(num) yajl_gen_integer(gen, num)
+#define YDOUBLE(num) yajl_gen_double(gen, num)
+#define YBOOL(v) yajl_gen_bool(gen, v)
+#define YNULL() yajl_gen_null(gen)
+#define YARR(body) \
+ { \
+ yajl_gen_array_open(gen); \
+ body; \
+ yajl_gen_array_close(gen); \
+ }
+#define YMAP(body) \
+ { \
+ yajl_gen_map_open(gen); \
+ body; \
+ yajl_gen_map_close(gen); \
+ }
+
+typedef unsigned long Window;
+
+const char *DEFAULT_SOCKET_PATH = "/tmp/dwm.sock";
+static int sock_fd = -1;
+static unsigned int ignore_reply = 0;
+
+typedef enum IPCMessageType {
+ IPC_TYPE_RUN_COMMAND = 0,
+ IPC_TYPE_GET_MONITORS = 1,
+ IPC_TYPE_GET_TAGS = 2,
+ IPC_TYPE_GET_LAYOUTS = 3,
+ IPC_TYPE_GET_DWM_CLIENT = 4,
+ IPC_TYPE_SUBSCRIBE = 5,
+ IPC_TYPE_EVENT = 6
+} IPCMessageType;
+
+// Every IPC message must begin with this
+typedef struct dwm_ipc_header {
+ uint8_t magic[IPC_MAGIC_LEN];
+ uint32_t size;
+ uint8_t type;
+} __attribute((packed)) dwm_ipc_header_t;
+
+static int
+recv_message(uint8_t *msg_type, uint32_t *reply_size, uint8_t **reply)
+{
+ uint32_t read_bytes = 0;
+ const int32_t to_read = sizeof(dwm_ipc_header_t);
+ char header[to_read];
+ char *walk = header;
+
+ // Try to read header
+ while (read_bytes < to_read) {
+ ssize_t n = read(sock_fd, header + read_bytes, to_read - read_bytes);
+
+ if (n == 0) {
+ if (read_bytes == 0) {
+ fprintf(stderr, "Unexpectedly reached EOF while reading header.");
+ fprintf(stderr,
+ "Read %" PRIu32 " bytes, expected %" PRIu32 " total bytes.\n",
+ read_bytes, to_read);
+ return -2;
+ } else {
+ fprintf(stderr, "Unexpectedly reached EOF while reading header.");
+ fprintf(stderr,
+ "Read %" PRIu32 " bytes, expected %" PRIu32 " total bytes.\n",
+ read_bytes, to_read);
+ return -3;
+ }
+ } else if (n == -1) {
+ return -1;
+ }
+
+ read_bytes += n;
+ }
+
+ // Check if magic string in header matches
+ if (memcmp(walk, IPC_MAGIC, IPC_MAGIC_LEN) != 0) {
+ fprintf(stderr, "Invalid magic string. Got '%.*s', expected '%s'\n",
+ IPC_MAGIC_LEN, walk, IPC_MAGIC);
+ return -3;
+ }
+
+ walk += IPC_MAGIC_LEN;
+
+ // Extract reply size
+ memcpy(reply_size, walk, sizeof(uint32_t));
+ walk += sizeof(uint32_t);
+
+ // Extract message type
+ memcpy(msg_type, walk, sizeof(uint8_t));
+ walk += sizeof(uint8_t);
+
+ (*reply) = malloc(*reply_size);
+
+ // Extract payload
+ read_bytes = 0;
+ while (read_bytes < *reply_size) {
+ ssize_t n = read(sock_fd, *reply + read_bytes, *reply_size - read_bytes);
+
+ if (n == 0) {
+ fprintf(stderr, "Unexpectedly reached EOF while reading payload.");
+ fprintf(stderr, "Read %" PRIu32 " bytes, expected %" PRIu32 " bytes.\n",
+ read_bytes, *reply_size);
+ free(*reply);
+ return -2;
+ } else if (n == -1) {
+ if (errno == EINTR || errno == EAGAIN) continue;
+ free(*reply);
+ return -1;
+ }
+
+ read_bytes += n;
+ }
+
+ return 0;
+}
+
+static int
+read_socket(IPCMessageType *msg_type, uint32_t *msg_size, char **msg)
+{
+ int ret = -1;
+
+ while (ret != 0) {
+ ret = recv_message((uint8_t *)msg_type, msg_size, (uint8_t **)msg);
+
+ if (ret < 0) {
+ // Try again (non-fatal error)
+ if (ret == -1 && (errno == EINTR || errno == EAGAIN)) continue;
+
+ fprintf(stderr, "Error receiving response from socket. ");
+ fprintf(stderr, "The connection might have been lost.\n");
+ exit(2);
+ }
+ }
+
+ return 0;
+}
+
+static ssize_t
+write_socket(const void *buf, size_t count)
+{
+ size_t written = 0;
+
+ while (written < count) {
+ const ssize_t n =
+ write(sock_fd, ((uint8_t *)buf) + written, count - written);
+
+ if (n == -1) {
+ if (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR)
+ continue;
+ else
+ return n;
+ }
+ written += n;
+ }
+ return written;
+}
+
+static void
+connect_to_socket()
+{
+ struct sockaddr_un addr;
+
+ int sock = socket(AF_UNIX, SOCK_STREAM, 0);
+
+ // Initialize struct to 0
+ memset(&addr, 0, sizeof(struct sockaddr_un));
+
+ addr.sun_family = AF_UNIX;
+ strcpy(addr.sun_path, DEFAULT_SOCKET_PATH);
+
+ connect(sock, (const struct sockaddr *)&addr, sizeof(struct sockaddr_un));
+
+ sock_fd = sock;
+}
+
+static int
+send_message(IPCMessageType msg_type, uint32_t msg_size, uint8_t *msg)
+{
+ dwm_ipc_header_t header = {
+ .magic = IPC_MAGIC_ARR, .size = msg_size, .type = msg_type};
+
+ size_t header_size = sizeof(dwm_ipc_header_t);
+ size_t total_size = header_size + msg_size;
+
+ uint8_t buffer[total_size];
+
+ // Copy header to buffer
+ memcpy(buffer, &header, header_size);
+ // Copy message to buffer
+ memcpy(buffer + header_size, msg, header.size);
+
+ write_socket(buffer, total_size);
+
+ return 0;
+}
+
+static int
+is_float(const char *s)
+{
+ size_t len = strlen(s);
+ int is_dot_used = 0;
+ int is_minus_used = 0;
+
+ // Floats can only have one decimal point in between or digits
+ // Optionally, floats can also be below zero (negative)
+ for (int i = 0; i < len; i++) {
+ if (isdigit(s[i]))
+ continue;
+ else if (!is_dot_used && s[i] == '.' && i != 0 && i != len - 1) {
+ is_dot_used = 1;
+ continue;
+ } else if (!is_minus_used && s[i] == '-' && i == 0) {
+ is_minus_used = 1;
+ continue;
+ } else
+ return 0;
+ }
+
+ return 1;
+}
+
+static int
+is_unsigned_int(const char *s)
+{
+ size_t len = strlen(s);
+
+ // Unsigned int can only have digits
+ for (int i = 0; i < len; i++) {
+ if (isdigit(s[i]))
+ continue;
+ else
+ return 0;
+ }
+
+ return 1;
+}
+
+static int
+is_signed_int(const char *s)
+{
+ size_t len = strlen(s);
+
+ // Signed int can only have digits and a negative sign at the start
+ for (int i = 0; i < len; i++) {
+ if (isdigit(s[i]))
+ continue;
+ else if (i == 0 && s[i] == '-') {
+ continue;
+ } else
+ return 0;
+ }
+
+ return 1;
+}
+
+static void
+flush_socket_reply()
+{
+ IPCMessageType reply_type;
+ uint32_t reply_size;
+ char *reply;
+
+ read_socket(&reply_type, &reply_size, &reply);
+
+ free(reply);
+}
+
+static void
+print_socket_reply()
+{
+ IPCMessageType reply_type;
+ uint32_t reply_size;
+ char *reply;
+
+ read_socket(&reply_type, &reply_size, &reply);
+
+ printf("%.*s\n", reply_size, reply);
+ fflush(stdout);
+ free(reply);
+}
+
+static int
+run_command(const char *name, char *args[], int argc)
+{
+ const unsigned char *msg;
+ size_t msg_size;
+
+ yajl_gen gen = yajl_gen_alloc(NULL);
+
+ // Message format:
+ // {
+ // "command": "<name>",
+ // "args": [ ... ]
+ // }
+ // clang-format off
+ YMAP(
+ YSTR("command"); YSTR(name);
+ YSTR("args"); YARR(
+ for (int i = 0; i < argc; i++) {
+ if (is_signed_int(args[i])) {
+ long long num = atoll(args[i]);
+ YINT(num);
+ } else if (is_float(args[i])) {
+ float num = atof(args[i]);
+ YDOUBLE(num);
+ } else {
+ YSTR(args[i]);
+ }
+ }
+ )
+ )
+ // clang-format on
+
+ yajl_gen_get_buf(gen, &msg, &msg_size);
+
+ send_message(IPC_TYPE_RUN_COMMAND, msg_size, (uint8_t *)msg);
+
+ if (!ignore_reply)
+ print_socket_reply();
+ else
+ flush_socket_reply();
+
+ yajl_gen_free(gen);
+
+ return 0;
+}
+
+static int
+get_monitors()
+{
+ send_message(IPC_TYPE_GET_MONITORS, 1, (uint8_t *)"");
+ print_socket_reply();
+ return 0;
+}
+
+static int
+get_tags()
+{
+ send_message(IPC_TYPE_GET_TAGS, 1, (uint8_t *)"");
+ print_socket_reply();
+
+ return 0;
+}
+
+static int
+get_layouts()
+{
+ send_message(IPC_TYPE_GET_LAYOUTS, 1, (uint8_t *)"");
+ print_socket_reply();
+
+ return 0;
+}
+
+static int
+get_dwm_client(Window win)
+{
+ const unsigned char *msg;
+ size_t msg_size;
+
+ yajl_gen gen = yajl_gen_alloc(NULL);
+
+ // Message format:
+ // {
+ // "client_window_id": "<win>"
+ // }
+ // clang-format off
+ YMAP(
+ YSTR("client_window_id"); YINT(win);
+ )
+ // clang-format on
+
+ yajl_gen_get_buf(gen, &msg, &msg_size);
+
+ send_message(IPC_TYPE_GET_DWM_CLIENT, msg_size, (uint8_t *)msg);
+
+ print_socket_reply();
+
+ yajl_gen_free(gen);
+
+ return 0;
+}
+
+static int
+subscribe(const char *event)
+{
+ const unsigned char *msg;
+ size_t msg_size;
+
+ yajl_gen gen = yajl_gen_alloc(NULL);
+
+ // Message format:
+ // {
+ // "event": "<event>",
+ // "action": "subscribe"
+ // }
+ // clang-format off
+ YMAP(
+ YSTR("event"); YSTR(event);
+ YSTR("action"); YSTR("subscribe");
+ )
+ // clang-format on
+
+ yajl_gen_get_buf(gen, &msg, &msg_size);
+
+ send_message(IPC_TYPE_SUBSCRIBE, msg_size, (uint8_t *)msg);
+
+ if (!ignore_reply)
+ print_socket_reply();
+ else
+ flush_socket_reply();
+
+ yajl_gen_free(gen);
+
+ return 0;
+}
+
+static void
+usage_error(const char *prog_name, const char *format, ...)
+{
+ va_list args;
+ va_start(args, format);
+
+ fprintf(stderr, "Error: ");
+ vfprintf(stderr, format, args);
+ fprintf(stderr, "\nusage: %s <command> [...]\n", prog_name);
+ fprintf(stderr, "Try '%s help'\n", prog_name);
+
+ va_end(args);
+ exit(1);
+}
+
+static void
+print_usage(const char *name)
+{
+ printf("usage: %s [options] <command> [...]\n", name);
+ puts("");
+ puts("Commands:");
+ puts(" run_command <name> [args...] Run an IPC command");
+ puts("");
+ puts(" get_monitors Get monitor properties");
+ puts("");
+ puts(" get_tags Get list of tags");
+ puts("");
+ puts(" get_layouts Get list of layouts");
+ puts("");
+ puts(" get_dwm_client <window_id> Get dwm client proprties");
+ puts("");
+ puts(" subscribe [events...] Subscribe to specified events");
+ puts(" Options: " IPC_EVENT_TAG_CHANGE ",");
+ puts(" " IPC_EVENT_LAYOUT_CHANGE ",");
+ puts(" " IPC_EVENT_CLIENT_FOCUS_CHANGE ",");
+ puts(" " IPC_EVENT_MONITOR_FOCUS_CHANGE ",");
+ puts(" " IPC_EVENT_FOCUSED_TITLE_CHANGE ",");
+ puts(" " IPC_EVENT_FOCUSED_STATE_CHANGE);
+ puts("");
+ puts(" help Display this message");
+ puts("");
+ puts("Options:");
+ puts(" --ignore-reply Don't print reply messages from");
+ puts(" run_command and subscribe.");
+ puts("");
+}
+
+int
+main(int argc, char *argv[])
+{
+ const char *prog_name = argv[0];
+
+ connect_to_socket();
+ if (sock_fd == -1) {
+ fprintf(stderr, "Failed to connect to socket\n");
+ return 1;
+ }
+
+ int i = 1;
+ if (i < argc && strcmp(argv[i], "--ignore-reply") == 0) {
+ ignore_reply = 1;
+ i++;
+ }
+
+ if (i >= argc) usage_error(prog_name, "Expected an argument, got none");
+
+ if (!argc || strcmp(argv[i], "help") == 0)
+ print_usage(prog_name);
+ else if (strcmp(argv[i], "run_command") == 0) {
+ if (++i >= argc) usage_error(prog_name, "No command specified");
+ // Command name
+ char *command = argv[i];
+ // Command arguments are everything after command name
+ char **command_args = argv + ++i;
+ // Number of command arguments
+ int command_argc = argc - i;
+ run_command(command, command_args, command_argc);
+ } else if (strcmp(argv[i], "get_monitors") == 0) {
+ get_monitors();
+ } else if (strcmp(argv[i], "get_tags") == 0) {
+ get_tags();
+ } else if (strcmp(argv[i], "get_layouts") == 0) {
+ get_layouts();
+ } else if (strcmp(argv[i], "get_dwm_client") == 0) {
+ if (++i < argc) {
+ if (is_unsigned_int(argv[i])) {
+ Window win = atol(argv[i]);
+ get_dwm_client(win);
+ } else
+ usage_error(prog_name, "Expected unsigned integer argument");
+ } else
+ usage_error(prog_name, "Expected the window id");
+ } else if (strcmp(argv[i], "subscribe") == 0) {
+ if (++i < argc) {
+ for (int j = i; j < argc; j++) subscribe(argv[j]);
+ } else
+ usage_error(prog_name, "Expected event name");
+ // Keep listening for events forever
+ while (1) {
+ print_socket_reply();
+ }
+ } else
+ usage_error(prog_name, "Invalid argument '%s'", argv[i]);
+
+ return 0;
+}
+
diff --git a/patch/ipc/ipc.c b/patch/ipc/ipc.c
new file mode 100644
index 0000000..eae9667
--- /dev/null
+++ b/patch/ipc/ipc.c
@@ -0,0 +1,1202 @@
+#include "ipc.h"
+
+#include <errno.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/epoll.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <unistd.h>
+#include <yajl/yajl_gen.h>
+#include <yajl/yajl_tree.h>
+
+#include "util.h"
+#include "yajl_dumps.h"
+
+static struct sockaddr_un sockaddr;
+static struct epoll_event sock_epoll_event;
+static IPCClientList ipc_clients = NULL;
+static int epoll_fd = -1;
+static int sock_fd = -1;
+static IPCCommand *ipc_commands;
+static unsigned int ipc_commands_len;
+// Max size is 1 MB
+static const uint32_t MAX_MESSAGE_SIZE = 1000000;
+static const int IPC_SOCKET_BACKLOG = 5;
+
+/**
+ * Create IPC socket at specified path and return file descriptor to socket.
+ * This initializes the static variable sockaddr.
+ */
+static int
+ipc_create_socket(const char *filename)
+{
+ char *normal_filename;
+ char *parent;
+ const size_t addr_size = sizeof(struct sockaddr_un);
+ const int sock_type = SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC;
+
+ normalizepath(filename, &normal_filename);
+
+ // In case socket file exists
+ unlink(normal_filename);
+
+ // For portability clear the addr structure, since some implementations have
+ // nonstandard fields in the structure
+ memset(&sockaddr, 0, addr_size);
+
+ parentdir(normal_filename, &parent);
+ // Create parent directories
+ mkdirp(parent);
+ free(parent);
+
+ sockaddr.sun_family = AF_LOCAL;
+ strcpy(sockaddr.sun_path, normal_filename);
+ free(normal_filename);
+
+ sock_fd = socket(AF_LOCAL, sock_type, 0);
+ if (sock_fd == -1) {
+ fputs("Failed to create socket\n", stderr);
+ return -1;
+ }
+
+ DEBUG("Created socket at %s\n", sockaddr.sun_path);
+
+ if (bind(sock_fd, (const struct sockaddr *)&sockaddr, addr_size) == -1) {
+ fputs("Failed to bind socket\n", stderr);
+ return -1;
+ }
+
+ DEBUG("Socket binded\n");
+
+ if (listen(sock_fd, IPC_SOCKET_BACKLOG) < 0) {
+ fputs("Failed to listen for connections on socket\n", stderr);
+ return -1;
+ }
+
+ DEBUG("Now listening for connections on socket\n");
+
+ return sock_fd;
+}
+
+/**
+ * Internal function used to receive IPC messages from a given file descriptor.
+ *
+ * Returns -1 on error reading (could be EAGAIN or EINTR)
+ * Returns -2 if EOF before header could be read
+ * Returns -3 if invalid IPC header
+ * Returns -4 if message length exceeds MAX_MESSAGE_SIZE
+ */
+static int
+ipc_recv_message(int fd, uint8_t *msg_type, uint32_t *reply_size,
+ uint8_t **reply)
+{
+ uint32_t read_bytes = 0;
+ const int32_t to_read = sizeof(dwm_ipc_header_t);
+ char header[to_read];
+ char *walk = header;
+
+ // Try to read header
+ while (read_bytes < to_read) {
+ const ssize_t n = read(fd, header + read_bytes, to_read - read_bytes);
+
+ if (n == 0) {
+ if (read_bytes == 0) {
+ fprintf(stderr, "Unexpectedly reached EOF while reading header.");
+ fprintf(stderr,
+ "Read %" PRIu32 " bytes, expected %" PRIu32 " total bytes.\n",
+ read_bytes, to_read);
+ return -2;
+ } else {
+ fprintf(stderr, "Unexpectedly reached EOF while reading header.");
+ fprintf(stderr,
+ "Read %" PRIu32 " bytes, expected %" PRIu32 " total bytes.\n",
+ read_bytes, to_read);
+ return -3;
+ }
+ } else if (n == -1) {
+ // errno will still be set
+ return -1;
+ }
+
+ read_bytes += n;
+ }
+
+ // Check if magic string in header matches
+ if (memcmp(walk, IPC_MAGIC, IPC_MAGIC_LEN) != 0) {
+ fprintf(stderr, "Invalid magic string. Got '%.*s', expected '%s'\n",
+ IPC_MAGIC_LEN, walk, IPC_MAGIC);
+ return -3;
+ }
+
+ walk += IPC_MAGIC_LEN;
+
+ // Extract reply size
+ memcpy(reply_size, walk, sizeof(uint32_t));
+ walk += sizeof(uint32_t);
+
+ if (*reply_size > MAX_MESSAGE_SIZE) {
+ fprintf(stderr, "Message too long: %" PRIu32 " bytes. ", *reply_size);
+ fprintf(stderr, "Maximum message size is: %d\n", MAX_MESSAGE_SIZE);
+ return -4;
+ }
+
+ // Extract message type
+ memcpy(msg_type, walk, sizeof(uint8_t));
+ walk += sizeof(uint8_t);
+
+ if (*reply_size > 0)
+ (*reply) = malloc(*reply_size);
+ else
+ return 0;
+
+ read_bytes = 0;
+ while (read_bytes < *reply_size) {
+ const ssize_t n = read(fd, *reply + read_bytes, *reply_size - read_bytes);
+
+ if (n == 0) {
+ fprintf(stderr, "Unexpectedly reached EOF while reading payload.");
+ fprintf(stderr, "Read %" PRIu32 " bytes, expected %" PRIu32 " bytes.\n",
+ read_bytes, *reply_size);
+ free(*reply);
+ return -2;
+ } else if (n == -1) {
+ // TODO: Should we return and wait for another epoll event?
+ // This would require saving the partial read in some way.
+ if (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK) continue;
+
+ free(*reply);
+ return -1;
+ }
+
+ read_bytes += n;
+ }
+
+ return 0;
+}
+
+/**
+ * Internal function used to write a buffer to a file descriptor
+ *
+ * Returns number of bytes written if successful write
+ * Returns 0 if no bytes were written due to EAGAIN or EWOULDBLOCK
+ * Returns -1 on unknown error trying to write, errno will carry over from
+ * write() call
+ */
+static ssize_t
+ipc_write_message(int fd, const void *buf, size_t count)
+{
+ size_t written = 0;
+
+ while (written < count) {
+ const ssize_t n = write(fd, (uint8_t *)buf + written, count - written);
+
+ if (n == -1) {
+ if (errno == EAGAIN || errno == EWOULDBLOCK)
+ return written;
+ else if (errno == EINTR)
+ continue;
+ else
+ return n;
+ }
+
+ written += n;
+ DEBUG("Wrote %zu/%zu to client at fd %d\n", written, count, fd);
+ }
+
+ return written;
+}
+
+/**
+ * Initialization for generic event message. This is used to allocate the yajl
+ * handle, set yajl options, and in the future any other initialization that
+ * should occur for event messages.
+ */
+static void
+ipc_event_init_message(yajl_gen *gen)
+{
+ *gen = yajl_gen_alloc(NULL);
+ yajl_gen_config(*gen, yajl_gen_beautify, 1);
+}
+
+/**
+ * Prepares buffers of IPC subscribers of specified event using buffer from yajl
+ * handle.
+ */
+static void
+ipc_event_prepare_send_message(yajl_gen gen, IPCEvent event)
+{
+ const unsigned char *buffer;
+ size_t len = 0;
+
+ yajl_gen_get_buf(gen, &buffer, &len);
+ len++; // For null char
+
+ for (IPCClient *c = ipc_clients; c; c = c->next) {
+ if (c->subscriptions & event) {
+ DEBUG("Sending selected client change event to fd %d\n", c->fd);
+ ipc_prepare_send_message(c, IPC_TYPE_EVENT, len, (char *)buffer);
+ }
+ }
+
+ // Not documented, but this frees temp_buffer
+ yajl_gen_free(gen);
+}
+
+/**
+ * Initialization for generic reply message. This is used to allocate the yajl
+ * handle, set yajl options, and in the future any other initialization that
+ * should occur for reply messages.
+ */
+static void
+ipc_reply_init_message(yajl_gen *gen)
+{
+ *gen = yajl_gen_alloc(NULL);
+ yajl_gen_config(*gen, yajl_gen_beautify, 1);
+}
+
+/**
+ * Prepares the IPC client's buffer with a message using the buffer of the yajl
+ * handle.
+ */
+static void
+ipc_reply_prepare_send_message(yajl_gen gen, IPCClient *c,
+ IPCMessageType msg_type)
+{
+ const unsigned char *buffer;
+ size_t len = 0;
+
+ yajl_gen_get_buf(gen, &buffer, &len);
+ len++; // For null char
+
+ ipc_prepare_send_message(c, msg_type, len, (const char *)buffer);
+
+ // Not documented, but this frees temp_buffer
+ yajl_gen_free(gen);
+}
+
+/**
+ * Find the IPCCommand with the specified name
+ *
+ * Returns 0 if a command with the specified name was found
+ * Returns -1 if a command with the specified name could not be found
+ */
+static int
+ipc_get_ipc_command(const char *name, IPCCommand *ipc_command)
+{
+ for (int i = 0; i < ipc_commands_len; i++) {
+ if (strcmp(ipc_commands[i].name, name) == 0) {
+ *ipc_command = ipc_commands[i];
+ return 0;
+ }
+ }
+
+ return -1;
+}
+
+/**
+ * Parse a IPC_TYPE_RUN_COMMAND message from a client. This function extracts
+ * the arguments, argument count, argument types, and command name and returns
+ * the parsed information as an IPCParsedCommand. If this function returns
+ * successfully, the parsed_command must be freed using
+ * ipc_free_parsed_command_members.
+ *
+ * Returns 0 if the message was successfully parsed
+ * Returns -1 otherwise
+ */
+static int
+ipc_parse_run_command(char *msg, IPCParsedCommand *parsed_command)
+{
+ char error_buffer[1000];
+ yajl_val parent = yajl_tree_parse(msg, error_buffer, 1000);
+
+ if (parent == NULL) {
+ fputs("Failed to parse command from client\n", stderr);
+ fprintf(stderr, "%s\n", error_buffer);
+ fprintf(stderr, "Tried to parse: %s\n", msg);
+ return -1;
+ }
+
+ // Format:
+ // {
+ // "command": "<command name>"
+ // "args": [ "arg1", "arg2", ... ]
+ // }
+ const char *command_path[] = {"command", 0};
+ yajl_val command_val = yajl_tree_get(parent, command_path, yajl_t_string);
+
+ if (command_val == NULL) {
+ fputs("No command key found in client message\n", stderr);
+ yajl_tree_free(parent);
+ return -1;
+ }
+
+ const char *command_name = YAJL_GET_STRING(command_val);
+ size_t command_name_len = strlen(command_name);
+ parsed_command->name = (char *)malloc((command_name_len + 1) * sizeof(char));
+ strcpy(parsed_command->name, command_name);
+
+ DEBUG("Received command: %s\n", parsed_command->name);
+
+ const char *args_path[] = {"args", 0};
+ yajl_val args_val = yajl_tree_get(parent, args_path, yajl_t_array);
+
+ if (args_val == NULL) {
+ fputs("No args key found in client message\n", stderr);
+ yajl_tree_free(parent);
+ return -1;
+ }
+
+ unsigned int *argc = &parsed_command->argc;
+ Arg **args = &parsed_command->args;
+ ArgType **arg_types = &parsed_command->arg_types;
+
+ *argc = args_val->u.array.len;
+
+ // If no arguments are specified, make a dummy argument to pass to the
+ // function. This is just the way dwm's void(Arg*) functions are setup.
+ if (*argc == 0) {
+ *args = (Arg *)malloc(sizeof(Arg));
+ *arg_types = (ArgType *)malloc(sizeof(ArgType));
+ (*arg_types)[0] = ARG_TYPE_NONE;
+ (*args)[0].f = 0;
+ (*argc)++;
+ } else if (*argc > 0) {
+ *args = (Arg *)calloc(*argc, sizeof(Arg));
+ *arg_types = (ArgType *)malloc(*argc * sizeof(ArgType));
+
+ for (int i = 0; i < *argc; i++) {
+ yajl_val arg_val = args_val->u.array.values[i];
+
+ if (YAJL_IS_NUMBER(arg_val)) {
+ if (YAJL_IS_INTEGER(arg_val)) {
+ // Any values below 0 must be a signed int
+ if (YAJL_GET_INTEGER(arg_val) < 0) {
+ (*args)[i].i = YAJL_GET_INTEGER(arg_val);
+ (*arg_types)[i] = ARG_TYPE_SINT;
+ DEBUG("i=%ld\n", (*args)[i].i);
+ // Any values above 0 should be an unsigned int
+ } else if (YAJL_GET_INTEGER(arg_val) >= 0) {
+ (*args)[i].ui = YAJL_GET_INTEGER(arg_val);
+ (*arg_types)[i] = ARG_TYPE_UINT;
+ DEBUG("ui=%ld\n", (*args)[i].i);
+ }
+ // If the number is not an integer, it must be a float
+ } else {
+ (*args)[i].f = (float)YAJL_GET_DOUBLE(arg_val);
+ (*arg_types)[i] = ARG_TYPE_FLOAT;
+ DEBUG("f=%f\n", (*args)[i].f);
+ // If argument is not a number, it must be a string
+ }
+ } else if (YAJL_IS_STRING(arg_val)) {
+ char *arg_s = YAJL_GET_STRING(arg_val);
+ size_t arg_s_size = (strlen(arg_s) + 1) * sizeof(char);
+ (*args)[i].v = (char *)malloc(arg_s_size);
+ (*arg_types)[i] = ARG_TYPE_STR;
+ strcpy((char *)(*args)[i].v, arg_s);
+ }
+ }
+ }
+
+ yajl_tree_free(parent);
+
+ return 0;
+}
+
+/**
+ * Free the members of a IPCParsedCommand struct
+ */
+static void
+ipc_free_parsed_command_members(IPCParsedCommand *command)
+{
+ for (int i = 0; i < command->argc; i++) {
+ if (command->arg_types[i] == ARG_TYPE_STR) free((void *)command->args[i].v);
+ }
+ free(command->args);
+ free(command->arg_types);
+ free(command->name);
+}
+
+/**
+ * Check if the given arguments are the correct length and type. Also do any
+ * casting to correct the types.
+ *
+ * Returns 0 if the arguments were the correct length and types
+ * Returns -1 if the argument count doesn't match
+ * Returns -2 if the argument types don't match
+ */
+static int
+ipc_validate_run_command(IPCParsedCommand *parsed, const IPCCommand actual)
+{
+ if (actual.argc != parsed->argc) return -1;
+
+ for (int i = 0; i < parsed->argc; i++) {
+ ArgType ptype = parsed->arg_types[i];
+ ArgType atype = actual.arg_types[i];
+
+ if (ptype != atype) {
+ if (ptype == ARG_TYPE_UINT && atype == ARG_TYPE_PTR)
+ // If this argument is supposed to be a void pointer, cast it
+ parsed->args[i].v = (void *)parsed->args[i].ui;
+ else if (ptype == ARG_TYPE_UINT && atype == ARG_TYPE_SINT)
+ // If this argument is supposed to be a signed int, cast it
+ parsed->args[i].i = parsed->args[i].ui;
+ else
+ return -2;
+ }
+ }
+
+ return 0;
+}
+
+/**
+ * Convert event name to their IPCEvent equivalent enum value
+ *
+ * Returns 0 if a valid event name was given
+ * Returns -1 otherwise
+ */
+static int
+ipc_event_stoi(const char *subscription, IPCEvent *event)
+{
+ if (strcmp(subscription, "tag_change_event") == 0)
+ *event = IPC_EVENT_TAG_CHANGE;
+ else if (strcmp(subscription, "client_focus_change_event") == 0)
+ *event = IPC_EVENT_CLIENT_FOCUS_CHANGE;
+ else if (strcmp(subscription, "layout_change_event") == 0)
+ *event = IPC_EVENT_LAYOUT_CHANGE;
+ else if (strcmp(subscription, "monitor_focus_change_event") == 0)
+ *event = IPC_EVENT_MONITOR_FOCUS_CHANGE;
+ else if (strcmp(subscription, "focused_title_change_event") == 0)
+ *event = IPC_EVENT_FOCUSED_TITLE_CHANGE;
+ else if (strcmp(subscription, "focused_state_change_event") == 0)
+ *event = IPC_EVENT_FOCUSED_STATE_CHANGE;
+ else
+ return -1;
+ return 0;
+}
+
+/**
+ * Parse a IPC_TYPE_SUBSCRIBE message from a client. This function extracts the
+ * event name and the subscription action from the message.
+ *
+ * Returns 0 if message was successfully parsed
+ * Returns -1 otherwise
+ */
+static int
+ipc_parse_subscribe(const char *msg, IPCSubscriptionAction *subscribe,
+ IPCEvent *event)
+{
+ char error_buffer[100];
+ yajl_val parent = yajl_tree_parse((char *)msg, error_buffer, 100);
+
+ if (parent == NULL) {
+ fputs("Failed to parse command from client\n", stderr);
+ fprintf(stderr, "%s\n", error_buffer);
+ return -1;
+ }
+
+ // Format:
+ // {
+ // "event": "<event name>"
+ // "action": "<subscribe|unsubscribe>"
+ // }
+ const char *event_path[] = {"event", 0};
+ yajl_val event_val = yajl_tree_get(parent, event_path, yajl_t_string);
+
+ if (event_val == NULL) {
+ fputs("No 'event' key found in client message\n", stderr);
+ return -1;
+ }
+
+ const char *event_str = YAJL_GET_STRING(event_val);
+ DEBUG("Received event: %s\n", event_str);
+
+ if (ipc_event_stoi(event_str, event) < 0) return -1;
+
+ const char *action_path[] = {"action", 0};
+ yajl_val action_val = yajl_tree_get(parent, action_path, yajl_t_string);
+
+ if (action_val == NULL) {
+ fputs("No 'action' key found in client message\n", stderr);
+ return -1;
+ }
+
+ const char *action = YAJL_GET_STRING(action_val);
+
+ if (strcmp(action, "subscribe") == 0)
+ *subscribe = IPC_ACTION_SUBSCRIBE;
+ else if (strcmp(action, "unsubscribe") == 0)
+ *subscribe = IPC_ACTION_UNSUBSCRIBE;
+ else {
+ fputs("Invalid action specified for subscription\n", stderr);
+ return -1;
+ }
+
+ yajl_tree_free(parent);
+
+ return 0;
+}
+
+/**
+ * Parse an IPC_TYPE_GET_DWM_CLIENT message from a client. This function
+ * extracts the window id from the message.
+ *
+ * Returns 0 if message was successfully parsed
+ * Returns -1 otherwise
+ */
+static int
+ipc_parse_get_dwm_client(const char *msg, Window *win)
+{
+ char error_buffer[100];
+
+ yajl_val parent = yajl_tree_parse(msg, error_buffer, 100);
+
+ if (parent == NULL) {
+ fputs("Failed to parse message from client\n", stderr);
+ fprintf(stderr, "%s\n", error_buffer);
+ return -1;
+ }
+
+ // Format:
+ // {
+ // "client_window_id": <client window id>
+ // }
+ const char *win_path[] = {"client_window_id", 0};
+ yajl_val win_val = yajl_tree_get(parent, win_path, yajl_t_number);
+
+ if (win_val == NULL) {
+ fputs("No client window id found in client message\n", stderr);
+ return -1;
+ }
+
+ *win = YAJL_GET_INTEGER(win_val);
+
+ yajl_tree_free(parent);
+
+ return 0;
+}
+
+/**
+ * Called when an IPC_TYPE_RUN_COMMAND message is received from a client. This
+ * function parses, executes the given command, and prepares a reply message to
+ * the client indicating success/failure.
+ *
+ * NOTE: There is currently no check for argument validity beyond the number of
+ * arguments given and types of arguments. There is also no way to check if the
+ * function succeeded based on dwm's void(const Arg*) function types. Pointer
+ * arguments can cause crashes if they are not validated in the function itself.
+ *
+ * Returns 0 if message was successfully parsed
+ * Returns -1 on failure parsing message
+ */
+static int
+ipc_run_command(IPCClient *ipc_client, char *msg)
+{
+ IPCParsedCommand parsed_command;
+ IPCCommand ipc_command;
+
+ // Initialize struct
+ memset(&parsed_command, 0, sizeof(IPCParsedCommand));
+
+ if (ipc_parse_run_command(msg, &parsed_command) < 0) {
+ ipc_prepare_reply_failure(ipc_client, IPC_TYPE_RUN_COMMAND,
+ "Failed to parse run command");
+ return -1;
+ }
+
+ if (ipc_get_ipc_command(parsed_command.name, &ipc_command) < 0) {
+ ipc_prepare_reply_failure(ipc_client, IPC_TYPE_RUN_COMMAND,
+ "Command %s not found", parsed_command.name);
+ ipc_free_parsed_command_members(&parsed_command);
+ return -1;
+ }
+
+ int res = ipc_validate_run_command(&parsed_command, ipc_command);
+ if (res < 0) {
+ if (res == -1)
+ ipc_prepare_reply_failure(ipc_client, IPC_TYPE_RUN_COMMAND,
+ "%u arguments provided, %u expected",
+ parsed_command.argc, ipc_command.argc);
+ else if (res == -2)
+ ipc_prepare_reply_failure(ipc_client, IPC_TYPE_RUN_COMMAND,
+ "Type mismatch");
+ ipc_free_parsed_command_members(&parsed_command);
+ return -1;
+ }
+
+ if (parsed_command.argc == 1)
+ ipc_command.func.single_param(parsed_command.args);
+ else if (parsed_command.argc > 1)
+ ipc_command.func.array_param(parsed_command.args, parsed_command.argc);
+
+ DEBUG("Called function for command %s\n", parsed_command.name);
+
+ ipc_free_parsed_command_members(&parsed_command);
+
+ ipc_prepare_reply_success(ipc_client, IPC_TYPE_RUN_COMMAND);
+ return 0;
+}
+
+/**
+ * Called when an IPC_TYPE_GET_MONITORS message is received from a client. It
+ * prepares a reply with the properties of all of the monitors in JSON.
+ */
+static void
+ipc_get_monitors(IPCClient *c, Monitor *mons, Monitor *selmon)
+{
+ yajl_gen gen;
+ ipc_reply_init_message(&gen);
+ dump_monitors(gen, mons, selmon);
+
+ ipc_reply_prepare_send_message(gen, c, IPC_TYPE_GET_MONITORS);
+}
+
+/**
+ * Called when an IPC_TYPE_GET_TAGS message is received from a client. It
+ * prepares a reply with info about all the tags in JSON.
+ */
+static void
+ipc_get_tags(IPCClient *c, const int tags_len)
+{
+ yajl_gen gen;
+ ipc_reply_init_message(&gen);
+
+ dump_tags(gen, tags_len);
+
+ ipc_reply_prepare_send_message(gen, c, IPC_TYPE_GET_TAGS);
+}
+
+/**
+ * Called when an IPC_TYPE_GET_LAYOUTS message is received from a client. It
+ * prepares a reply with a JSON array of available layouts
+ */
+static void
+ipc_get_layouts(IPCClient *c, const Layout layouts[], const int layouts_len)
+{
+ yajl_gen gen;
+ ipc_reply_init_message(&gen);
+
+ dump_layouts(gen, layouts, layouts_len);
+
+ ipc_reply_prepare_send_message(gen, c, IPC_TYPE_GET_LAYOUTS);
+}
+
+/**
+ * Called when an IPC_TYPE_GET_DWM_CLIENT message is received from a client. It
+ * prepares a JSON reply with the properties of the client with the specified
+ * window XID.
+ *
+ * Returns 0 if the message was successfully parsed and if the client with the
+ * specified window XID was found
+ * Returns -1 if the message could not be parsed
+ */
+static int
+ipc_get_dwm_client(IPCClient *ipc_client, const char *msg, const Monitor *mons)
+{
+ Window win;
+
+ if (ipc_parse_get_dwm_client(msg, &win) < 0) return -1;
+
+ // Find client with specified window XID
+ for (const Monitor *m = mons; m; m = m->next)
+ for (Client *c = m->clients; c; c = c->next)
+ if (c->win == win) {
+ yajl_gen gen;
+ ipc_reply_init_message(&gen);
+
+ dump_client(gen, c);
+
+ ipc_reply_prepare_send_message(gen, ipc_client,
+ IPC_TYPE_GET_DWM_CLIENT);
+
+ return 0;
+ }
+
+ ipc_prepare_reply_failure(ipc_client, IPC_TYPE_GET_DWM_CLIENT,
+ "Client with window id %d not found", win);
+ return -1;
+}
+
+/**
+ * Called when an IPC_TYPE_SUBSCRIBE message is received from a client. It
+ * subscribes/unsubscribes the client from the specified event and replies with
+ * the result.
+ *
+ * Returns 0 if the message was successfully parsed.
+ * Returns -1 if the message could not be parsed
+ */
+static int
+ipc_subscribe(IPCClient *c, const char *msg)
+{
+ IPCSubscriptionAction action = IPC_ACTION_SUBSCRIBE;
+ IPCEvent event = 0;
+
+ if (ipc_parse_subscribe(msg, &action, &event)) {
+ ipc_prepare_reply_failure(c, IPC_TYPE_SUBSCRIBE, "Event does not exist");
+ return -1;
+ }
+
+ if (action == IPC_ACTION_SUBSCRIBE) {
+ DEBUG("Subscribing client on fd %d to %d\n", c->fd, event);
+ c->subscriptions |= event;
+ } else if (action == IPC_ACTION_UNSUBSCRIBE) {
+ DEBUG("Unsubscribing client on fd %d to %d\n", c->fd, event);
+ c->subscriptions ^= event;
+ } else {
+ ipc_prepare_reply_failure(c, IPC_TYPE_SUBSCRIBE,
+ "Invalid subscription action");
+ return -1;
+ }
+
+ ipc_prepare_reply_success(c, IPC_TYPE_SUBSCRIBE);
+ return 0;
+}
+
+int
+ipc_init(const char *socket_path, const int p_epoll_fd, IPCCommand commands[],
+ const int commands_len)
+{
+ // Initialize struct to 0
+ memset(&sock_epoll_event, 0, sizeof(sock_epoll_event));
+
+ int socket_fd = ipc_create_socket(socket_path);
+ if (socket_fd < 0) return -1;
+
+ ipc_commands = commands;
+ ipc_commands_len = commands_len;
+
+ epoll_fd = p_epoll_fd;
+
+ // Wake up to incoming connection requests
+ sock_epoll_event.data.fd = socket_fd;
+ sock_epoll_event.events = EPOLLIN;
+ if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, socket_fd, &sock_epoll_event)) {
+ fputs("Failed to add sock file descriptor to epoll", stderr);
+ return -1;
+ }
+
+ return socket_fd;
+}
+
+void
+ipc_cleanup()
+{
+ IPCClient *c = ipc_clients;
+ // Free clients and their buffers
+ while (c) {
+ ipc_drop_client(c);
+ c = ipc_clients;
+ }
+
+ // Stop waking up for socket events
+ epoll_ctl(epoll_fd, EPOLL_CTL_DEL, sock_fd, &sock_epoll_event);
+
+ // Uninitialize all static variables
+ epoll_fd = -1;
+ sock_fd = -1;
+ ipc_commands = NULL;
+ ipc_commands_len = 0;
+ memset(&sock_epoll_event, 0, sizeof(struct epoll_event));
+ memset(&sockaddr, 0, sizeof(struct sockaddr_un));
+
+ // Delete socket
+ unlink(sockaddr.sun_path);
+
+ shutdown(sock_fd, SHUT_RDWR);
+ close(sock_fd);
+}
+
+int
+ipc_get_sock_fd()
+{
+ return sock_fd;
+}
+
+IPCClient *
+ipc_get_client(int fd)
+{
+ return ipc_list_get_client(ipc_clients, fd);
+}
+
+int
+ipc_is_client_registered(int fd)
+{
+ return (ipc_get_client(fd) != NULL);
+}
+
+int
+ipc_accept_client()
+{
+ int fd = -1;
+
+ struct sockaddr_un client_addr;
+ socklen_t len = 0;
+
+ // For portability clear the addr structure, since some implementations
+ // have nonstandard fields in the structure
+ memset(&client_addr, 0, sizeof(struct sockaddr_un));
+
+ fd = accept(sock_fd, (struct sockaddr *)&client_addr, &len);
+ if (fd < 0 && errno != EINTR) {
+ fputs("Failed to accept IPC connection from client", stderr);
+ return -1;
+ }
+
+ if (fcntl(fd, F_SETFD, FD_CLOEXEC) < 0) {
+ shutdown(fd, SHUT_RDWR);
+ close(fd);
+ fputs("Failed to set flags on new client fd", stderr);
+ }
+
+ IPCClient *nc = ipc_client_new(fd);
+ if (nc == NULL) return -1;
+
+ // Wake up to messages from this client
+ nc->event.data.fd = fd;
+ nc->event.events = EPOLLIN | EPOLLHUP;
+ epoll_ctl(epoll_fd, EPOLL_CTL_ADD, fd, &nc->event);
+
+ ipc_list_add_client(&ipc_clients, nc);
+
+ DEBUG("%s%d\n", "New client at fd: ", fd);
+
+ return fd;
+}
+
+int
+ipc_drop_client(IPCClient *c)
+{
+ int fd = c->fd;
+ shutdown(fd, SHUT_RDWR);
+ int res = close(fd);
+
+ if (res == 0) {
+ struct epoll_event ev;
+
+ // Stop waking up to messages from this client
+ epoll_ctl(epoll_fd, EPOLL_CTL_DEL, fd, &ev);
+ ipc_list_remove_client(&ipc_clients, c);
+
+ free(c->buffer);
+ free(c);
+
+ DEBUG("Successfully removed client on fd %d\n", fd);
+ } else if (res < 0 && res != EINTR) {
+ fprintf(stderr, "Failed to close fd %d\n", fd);
+ }
+
+ return res;
+}
+
+int
+ipc_read_client(IPCClient *c, IPCMessageType *msg_type, uint32_t *msg_size,
+ char **msg)
+{
+ int fd = c->fd;
+ int ret =
+ ipc_recv_message(fd, (uint8_t *)msg_type, msg_size, (uint8_t **)msg);
+
+ if (ret < 0) {
+ // This will happen if these errors occur while reading header
+ if (ret == -1 &&
+ (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK))
+ return -2;
+
+ fprintf(stderr, "Error reading message: dropping client at fd %d\n", fd);
+ ipc_drop_client(c);
+
+ return -1;
+ }
+
+ // Make sure receive message is null terminated to avoid parsing issues
+ if (*msg_size > 0) {
+ size_t len = *msg_size;
+ nullterminate(msg, &len);
+ *msg_size = len;
+ }
+
+ DEBUG("[fd %d] ", fd);
+ if (*msg_size > 0)
+ DEBUG("Received message: '%.*s' ", *msg_size, *msg);
+ else
+ DEBUG("Received empty message ");
+ DEBUG("Message type: %" PRIu8 " ", (uint8_t)*msg_type);
+ DEBUG("Message size: %" PRIu32 "\n", *msg_size);
+
+ return 0;
+}
+
+ssize_t
+ipc_write_client(IPCClient *c)
+{
+ const ssize_t n = ipc_write_message(c->fd, c->buffer, c->buffer_size);
+
+ if (n < 0) return n;
+
+ // TODO: Deal with client timeouts
+
+ if (n == c->buffer_size) {
+ c->buffer_size = 0;
+ free(c->buffer);
+ // No dangling pointers!
+ c->buffer = NULL;
+ // Stop waking up when client is ready to receive messages
+ if (c->event.events & EPOLLOUT) {
+ c->event.events -= EPOLLOUT;
+ epoll_ctl(epoll_fd, EPOLL_CTL_MOD, c->fd, &c->event);
+ }
+ return n;
+ }
+
+ // Shift unwritten buffer to beginning of buffer and reallocate
+ c->buffer_size -= n;
+ memmove(c->buffer, c->buffer + n, c->buffer_size);
+ c->buffer = (char *)realloc(c->buffer, c->buffer_size);
+
+ return n;
+}
+
+void
+ipc_prepare_send_message(IPCClient *c, const IPCMessageType msg_type,
+ const uint32_t msg_size, const char *msg)
+{
+ dwm_ipc_header_t header = {
+ .magic = IPC_MAGIC_ARR, .type = msg_type, .size = msg_size};
+
+ uint32_t header_size = sizeof(dwm_ipc_header_t);
+ uint32_t packet_size = header_size + msg_size;
+
+ if (c->buffer == NULL)
+ c->buffer = (char *)malloc(c->buffer_size + packet_size);
+ else
+ c->buffer = (char *)realloc(c->buffer, c->buffer_size + packet_size);
+
+ // Copy header to end of client buffer
+ memcpy(c->buffer + c->buffer_size, &header, header_size);
+ c->buffer_size += header_size;
+
+ // Copy message to end of client buffer
+ memcpy(c->buffer + c->buffer_size, msg, msg_size);
+ c->buffer_size += msg_size;
+
+ // Wake up when client is ready to receive messages
+ c->event.events |= EPOLLOUT;
+ epoll_ctl(epoll_fd, EPOLL_CTL_MOD, c->fd, &c->event);
+}
+
+void
+ipc_prepare_reply_failure(IPCClient *c, IPCMessageType msg_type,
+ const char *format, ...)
+{
+ yajl_gen gen;
+ va_list args;
+
+ // Get output size
+ va_start(args, format);
+ size_t len = vsnprintf(NULL, 0, format, args);
+ va_end(args);
+ char *buffer = (char *)malloc((len + 1) * sizeof(char));
+
+ ipc_reply_init_message(&gen);
+
+ va_start(args, format);
+ vsnprintf(buffer, len + 1, format, args);
+ va_end(args);
+ dump_error_message(gen, buffer);
+
+ ipc_reply_prepare_send_message(gen, c, msg_type);
+ fprintf(stderr, "[fd %d] Error: %s\n", c->fd, buffer);
+
+ free(buffer);
+}
+
+void
+ipc_prepare_reply_success(IPCClient *c, IPCMessageType msg_type)
+{
+ const char *success_msg = "{\"result\":\"success\"}";
+ const size_t msg_len = strlen(success_msg) + 1; // +1 for null char
+
+ ipc_prepare_send_message(c, msg_type, msg_len, success_msg);
+}
+
+void
+ipc_tag_change_event(int mon_num, TagState old_state, TagState new_state)
+{
+ yajl_gen gen;
+ ipc_event_init_message(&gen);
+ dump_tag_event(gen, mon_num, old_state, new_state);
+ ipc_event_prepare_send_message(gen, IPC_EVENT_TAG_CHANGE);
+}
+
+void
+ipc_client_focus_change_event(int mon_num, Client *old_client,
+ Client *new_client)
+{
+ yajl_gen gen;
+ ipc_event_init_message(&gen);
+ dump_client_focus_change_event(gen, old_client, new_client, mon_num);
+ ipc_event_prepare_send_message(gen, IPC_EVENT_CLIENT_FOCUS_CHANGE);
+}
+
+void
+ipc_layout_change_event(const int mon_num, const char *old_symbol,
+ const Layout *old_layout, const char *new_symbol,
+ const Layout *new_layout)
+{
+ yajl_gen gen;
+ ipc_event_init_message(&gen);
+ dump_layout_change_event(gen, mon_num, old_symbol, old_layout, new_symbol,
+ new_layout);
+ ipc_event_prepare_send_message(gen, IPC_EVENT_LAYOUT_CHANGE);
+}
+
+void
+ipc_monitor_focus_change_event(const int last_mon_num, const int new_mon_num)
+{
+ yajl_gen gen;
+ ipc_event_init_message(&gen);
+ dump_monitor_focus_change_event(gen, last_mon_num, new_mon_num);
+ ipc_event_prepare_send_message(gen, IPC_EVENT_MONITOR_FOCUS_CHANGE);
+}
+
+void
+ipc_focused_title_change_event(const int mon_num, const Window client_id,
+ const char *old_name, const char *new_name)
+{
+ yajl_gen gen;
+ ipc_event_init_message(&gen);
+ dump_focused_title_change_event(gen, mon_num, client_id, old_name, new_name);
+ ipc_event_prepare_send_message(gen, IPC_EVENT_FOCUSED_TITLE_CHANGE);
+}
+
+void
+ipc_focused_state_change_event(const int mon_num, const Window client_id,
+ const ClientState *old_state,
+ const ClientState *new_state)
+{
+ yajl_gen gen;
+ ipc_event_init_message(&gen);
+ dump_focused_state_change_event(gen, mon_num, client_id, old_state,
+ new_state);
+ ipc_event_prepare_send_message(gen, IPC_EVENT_FOCUSED_STATE_CHANGE);
+}
+
+void
+ipc_send_events(Monitor *mons, Monitor **lastselmon, Monitor *selmon)
+{
+ for (Monitor *m = mons; m; m = m->next) {
+ unsigned int urg = 0, occ = 0, tagset = 0;
+
+ for (Client *c = m->clients; c; c = c->next) {
+ occ |= c->tags;
+
+ if (c->isurgent) urg |= c->tags;
+ }
+ tagset = m->tagset[m->seltags];
+
+ TagState new_state = {.selected = tagset, .occupied = occ, .urgent = urg};
+
+ if (memcmp(&m->tagstate, &new_state, sizeof(TagState)) != 0) {
+ ipc_tag_change_event(m->num, m->tagstate, new_state);
+ m->tagstate = new_state;
+ }
+
+ if (m->lastsel != m->sel) {
+ ipc_client_focus_change_event(m->num, m->lastsel, m->sel);
+ m->lastsel = m->sel;
+ }
+
+ if (strcmp(m->ltsymbol, m->lastltsymbol) != 0 ||
+ m->lastlt != m->lt[m->sellt]) {
+ ipc_layout_change_event(m->num, m->lastltsymbol, m->lastlt, m->ltsymbol,
+ m->lt[m->sellt]);
+ strcpy(m->lastltsymbol, m->ltsymbol);
+ m->lastlt = m->lt[m->sellt];
+ }
+
+ if (*lastselmon != selmon) {
+ if (*lastselmon != NULL)
+ ipc_monitor_focus_change_event((*lastselmon)->num, selmon->num);
+ *lastselmon = selmon;
+ }
+
+ Client *sel = m->sel;
+ if (!sel) continue;
+ ClientState *o = &m->sel->prevstate;
+ ClientState n = {.oldstate = sel->oldstate,
+ .isfixed = sel->isfixed,
+ .isfloating = sel->isfloating,
+ .isfullscreen = sel->isfullscreen,
+ .isurgent = sel->isurgent,
+ .neverfocus = sel->neverfocus};
+ if (memcmp(o, &n, sizeof(ClientState)) != 0) {
+ ipc_focused_state_change_event(m->num, m->sel->win, o, &n);
+ *o = n;
+ }
+ }
+}
+
+int
+ipc_handle_client_epoll_event(struct epoll_event *ev, Monitor *mons,
+ Monitor **lastselmon, Monitor *selmon, const int tags_len,
+ const Layout *layouts, const int layouts_len)
+{
+ int fd = ev->data.fd;
+ IPCClient *c = ipc_get_client(fd);
+
+ if (ev->events & EPOLLHUP) {
+ DEBUG("EPOLLHUP received from client at fd %d\n", fd);
+ ipc_drop_client(c);
+ } else if (ev->events & EPOLLOUT) {
+ DEBUG("Sending message to client at fd %d...\n", fd);
+ if (c->buffer_size) ipc_write_client(c);
+ } else if (ev->events & EPOLLIN) {
+ IPCMessageType msg_type = 0;
+ uint32_t msg_size = 0;
+ char *msg = NULL;
+
+ DEBUG("Received message from fd %d\n", fd);
+ if (ipc_read_client(c, &msg_type, &msg_size, &msg) < 0) return -1;
+
+ if (msg_type == IPC_TYPE_GET_MONITORS)
+ ipc_get_monitors(c, mons, selmon);
+ else if (msg_type == IPC_TYPE_GET_TAGS)
+ ipc_get_tags(c, tags_len);
+ else if (msg_type == IPC_TYPE_GET_LAYOUTS)
+ ipc_get_layouts(c, layouts, layouts_len);
+ else if (msg_type == IPC_TYPE_RUN_COMMAND) {
+ if (ipc_run_command(c, msg) < 0) return -1;
+ ipc_send_events(mons, lastselmon, selmon);
+ } else if (msg_type == IPC_TYPE_GET_DWM_CLIENT) {
+ if (ipc_get_dwm_client(c, msg, mons) < 0) return -1;
+ } else if (msg_type == IPC_TYPE_SUBSCRIBE) {
+ if (ipc_subscribe(c, msg) < 0) return -1;
+ } else {
+ fprintf(stderr, "Invalid message type received from fd %d", fd);
+ ipc_prepare_reply_failure(c, msg_type, "Invalid message type: %d",
+ msg_type);
+ }
+ free(msg);
+ } else {
+ fprintf(stderr, "Epoll event returned %d from fd %d\n", ev->events, fd);
+ return -1;
+ }
+
+ return 0;
+}
+
+int
+ipc_handle_socket_epoll_event(struct epoll_event *ev)
+{
+ if (!(ev->events & EPOLLIN)) return -1;
+
+ // EPOLLIN means incoming client connection request
+ fputs("Received EPOLLIN event on socket\n", stderr);
+ int new_fd = ipc_accept_client();
+
+ return new_fd;
+}
+
diff --git a/patch/ipc/ipc.h b/patch/ipc/ipc.h
new file mode 100644
index 0000000..4a72fb8
--- /dev/null
+++ b/patch/ipc/ipc.h
@@ -0,0 +1,320 @@
+#ifndef IPC_H_
+#define IPC_H_
+
+#include <stdint.h>
+#include <sys/epoll.h>
+#include <yajl/yajl_gen.h>
+
+#include "IPCClient.h"
+
+// clang-format off
+#define IPC_MAGIC "DWM-IPC"
+#define IPC_MAGIC_ARR { 'D', 'W', 'M', '-', 'I', 'P', 'C'}
+#define IPC_MAGIC_LEN 7 // Not including null char
+
+#define IPCCOMMAND(FUNC, ARGC, TYPES) \
+ { #FUNC, {FUNC }, ARGC, (ArgType[ARGC])TYPES }
+// clang-format on
+
+typedef enum IPCMessageType {
+ IPC_TYPE_RUN_COMMAND = 0,
+ IPC_TYPE_GET_MONITORS = 1,
+ IPC_TYPE_GET_TAGS = 2,
+ IPC_TYPE_GET_LAYOUTS = 3,
+ IPC_TYPE_GET_DWM_CLIENT = 4,
+ IPC_TYPE_SUBSCRIBE = 5,
+ IPC_TYPE_EVENT = 6
+} IPCMessageType;
+
+typedef enum IPCEvent {
+ IPC_EVENT_TAG_CHANGE = 1 << 0,
+ IPC_EVENT_CLIENT_FOCUS_CHANGE = 1 << 1,
+ IPC_EVENT_LAYOUT_CHANGE = 1 << 2,
+ IPC_EVENT_MONITOR_FOCUS_CHANGE = 1 << 3,
+ IPC_EVENT_FOCUSED_TITLE_CHANGE = 1 << 4,
+ IPC_EVENT_FOCUSED_STATE_CHANGE = 1 << 5
+} IPCEvent;
+
+typedef enum IPCSubscriptionAction {
+ IPC_ACTION_UNSUBSCRIBE = 0,
+ IPC_ACTION_SUBSCRIBE = 1
+} IPCSubscriptionAction;
+
+/**
+ * Every IPC packet starts with this structure
+ */
+typedef struct dwm_ipc_header {
+ uint8_t magic[IPC_MAGIC_LEN];
+ uint32_t size;
+ uint8_t type;
+} __attribute((packed)) dwm_ipc_header_t;
+
+typedef enum ArgType {
+ ARG_TYPE_NONE = 0,
+ ARG_TYPE_UINT = 1,
+ ARG_TYPE_SINT = 2,
+ ARG_TYPE_FLOAT = 3,
+ ARG_TYPE_PTR = 4,
+ ARG_TYPE_STR = 5
+} ArgType;
+
+/**
+ * An IPCCommand function can have either of these function signatures
+ */
+typedef union ArgFunction {
+ void (*single_param)(const Arg *);
+ void (*array_param)(const Arg *, int);
+} ArgFunction;
+
+typedef struct IPCCommand {
+ char *name;
+ ArgFunction func;
+ unsigned int argc;
+ ArgType *arg_types;
+} IPCCommand;
+
+typedef struct IPCParsedCommand {
+ char *name;
+ Arg *args;
+ ArgType *arg_types;
+ unsigned int argc;
+} IPCParsedCommand;
+
+/**
+ * Initialize the IPC socket and the IPC module
+ *
+ * @param socket_path Path to create the socket at
+ * @param epoll_fd File descriptor for epoll
+ * @param commands Address of IPCCommands array defined in config.h
+ * @param commands_len Length of commands[] array
+ *
+ * @return int The file descriptor of the socket if it was successfully created,
+ * -1 otherwise
+ */
+int ipc_init(const char *socket_path, const int p_epoll_fd,
+ IPCCommand commands[], const int commands_len);
+
+/**
+ * Uninitialize the socket and module. Free allocated memory and restore static
+ * variables to their state before ipc_init
+ */
+void ipc_cleanup();
+
+/**
+ * Get the file descriptor of the IPC socket
+ *
+ * @return int File descriptor of IPC socket, -1 if socket not created.
+ */
+int ipc_get_sock_fd();
+
+/**
+ * Get address to IPCClient with specified file descriptor
+ *
+ * @param fd File descriptor of IPC Client
+ *
+ * @return Address to IPCClient with specified file descriptor, -1 otherwise
+ */
+IPCClient *ipc_get_client(int fd);
+
+/**
+ * Check if an IPC client exists with the specified file descriptor
+ *
+ * @param fd File descriptor
+ *
+ * @return int 1 if client exists, 0 otherwise
+ */
+int ipc_is_client_registered(int fd);
+
+/**
+ * Disconnect an IPCClient from the socket and remove the client from the list
+ * of known connected clients
+ *
+ * @param c Address of IPCClient
+ *
+ * @return 0 if the client's file descriptor was closed successfully, the
+ * result of executing close() on the file descriptor otherwise.
+ */
+int ipc_drop_client(IPCClient *c);
+
+/**
+ * Accept an IPC Client requesting to connect to the socket and add it to the
+ * list of clients
+ *
+ * @return File descriptor of new client, -1 on error
+ */
+int ipc_accept_client();
+
+/**
+ * Read an incoming message from an accepted IPC client
+ *
+ * @param c Address of IPCClient
+ * @param msg_type Address to IPCMessageType variable which will be assigned
+ * the message type of the received message
+ * @param msg_size Address to uint32_t variable which will be assigned the size
+ * of the received message
+ * @param msg Address to char* variable which will be assigned the address of
+ * the received message. This must be freed using free().
+ *
+ * @return 0 on success, -1 on error reading message, -2 if reading the message
+ * resulted in EAGAIN, EINTR, or EWOULDBLOCK.
+ */
+int ipc_read_client(IPCClient *c, IPCMessageType *msg_type, uint32_t *msg_size,
+ char **msg);
+
+/**
+ * Write any pending buffer of the client to the client's socket
+ *
+ * @param c Client whose buffer to write
+ *
+ * @return Number of bytes written >= 0, -1 otherwise. errno will still be set
+ * from the write operation.
+ */
+ssize_t ipc_write_client(IPCClient *c);
+
+/**
+ * Prepare a message in the specified client's buffer.
+ *
+ * @param c Client to prepare message for
+ * @param msg_type Type of message to prepare
+ * @param msg_size Size of the message in bytes. Should not exceed
+ * MAX_MESSAGE_SIZE
+ * @param msg Message to prepare (not including header). This pointer can be
+ * freed after the function invocation.
+ */
+void ipc_prepare_send_message(IPCClient *c, const IPCMessageType msg_type,
+ const uint32_t msg_size, const char *msg);
+
+/**
+ * Prepare an error message in the specified client's buffer
+ *
+ * @param c Client to prepare message for
+ * @param msg_type Type of message
+ * @param format Format string following vsprintf
+ * @param ... Arguments for format string
+ */
+void ipc_prepare_reply_failure(IPCClient *c, IPCMessageType msg_type,
+ const char *format, ...);
+
+/**
+ * Prepare a success message in the specified client's buffer
+ *
+ * @param c Client to prepare message for
+ * @param msg_type Type of message
+ */
+void ipc_prepare_reply_success(IPCClient *c, IPCMessageType msg_type);
+
+/**
+ * Send a tag_change_event to all subscribers. Should be called only when there
+ * has been a tag state change.
+ *
+ * @param mon_num The index of the monitor (Monitor.num property)
+ * @param old_state The old tag state
+ * @param new_state The new (now current) tag state
+ */
+void ipc_tag_change_event(const int mon_num, TagState old_state,
+ TagState new_state);
+
+/**
+ * Send a client_focus_change_event to all subscribers. Should be called only
+ * when the client focus changes.
+ *
+ * @param mon_num The index of the monitor (Monitor.num property)
+ * @param old_client The old DWM client selection (Monitor.oldsel)
+ * @param new_client The new (now current) DWM client selection
+ */
+void ipc_client_focus_change_event(const int mon_num, Client *old_client,
+ Client *new_client);
+
+/**
+ * Send a layout_change_event to all subscribers. Should be called only
+ * when there has been a layout change.
+ *
+ * @param mon_num The index of the monitor (Monitor.num property)
+ * @param old_symbol The old layout symbol
+ * @param old_layout Address to the old Layout
+ * @param new_symbol The new (now current) layout symbol
+ * @param new_layout Address to the new Layout
+ */
+void ipc_layout_change_event(const int mon_num, const char *old_symbol,
+ const Layout *old_layout, const char *new_symbol,
+ const Layout *new_layout);
+
+/**
+ * Send a monitor_focus_change_event to all subscribers. Should be called only
+ * when the monitor focus changes.
+ *
+ * @param last_mon_num The index of the previously selected monitor
+ * @param new_mon_num The index of the newly selected monitor
+ */
+void ipc_monitor_focus_change_event(const int last_mon_num,
+ const int new_mon_num);
+
+/**
+ * Send a focused_title_change_event to all subscribers. Should only be called
+ * if a selected client has a title change.
+ *
+ * @param mon_num Index of the client's monitor
+ * @param client_id Window XID of client
+ * @param old_name Old name of the client window
+ * @param new_name New name of the client window
+ */
+void ipc_focused_title_change_event(const int mon_num, const Window client_id,
+ const char *old_name, const char *new_name);
+
+/**
+ * Send a focused_state_change_event to all subscribers. Should only be called
+ * if a selected client has a state change.
+ *
+ * @param mon_num Index of the client's monitor
+ * @param client_id Window XID of client
+ * @param old_state Old state of the client
+ * @param new_state New state of the client
+ */
+void ipc_focused_state_change_event(const int mon_num, const Window client_id,
+ const ClientState *old_state,
+ const ClientState *new_state);
+/**
+ * Check to see if an event has occured and call the *_change_event functions
+ * accordingly
+ *
+ * @param mons Address of Monitor pointing to start of linked list
+ * @param lastselmon Address of pointer to previously selected monitor
+ * @param selmon Address of selected Monitor
+ */
+void ipc_send_events(Monitor *mons, Monitor **lastselmon, Monitor *selmon);
+
+/**
+ * Handle an epoll event caused by a registered IPC client. Read, process, and
+ * handle any received messages from clients. Write pending buffer to client if
+ * the client is ready to receive messages. Drop clients that have sent an
+ * EPOLLHUP.
+ *
+ * @param ev Associated epoll event returned by epoll_wait
+ * @param mons Address of Monitor pointing to start of linked list
+ * @param selmon Address of selected Monitor
+ * @param lastselmon Address of pointer to previously selected monitor
+ * @param tags Array of tag names
+ * @param tags_len Length of tags array
+ * @param layouts Array of available layouts
+ * @param layouts_len Length of layouts array
+ *
+ * @return 0 if event was successfully handled, -1 on any error receiving
+ * or handling incoming messages or unhandled epoll event.
+ */
+int ipc_handle_client_epoll_event(struct epoll_event *ev, Monitor *mons,
+ Monitor **lastselmon, Monitor *selmon, const int tags_len,
+ const Layout *layouts, const int layouts_len);
+
+/**
+ * Handle an epoll event caused by the IPC socket. This function only handles an
+ * EPOLLIN event indicating a new client requesting to connect to the socket.
+ *
+ * @param ev Associated epoll event returned by epoll_wait
+ *
+ * @return 0, if the event was successfully handled, -1 if not an EPOLLIN event
+ * or if a new IPC client connection request could not be accepted.
+ */
+int ipc_handle_socket_epoll_event(struct epoll_event *ev);
+
+#endif /* IPC_H_ */
+
diff --git a/patch/ipc/util.c b/patch/ipc/util.c
new file mode 100644
index 0000000..7ea425e
--- /dev/null
+++ b/patch/ipc/util.c
@@ -0,0 +1,136 @@
+#include <errno.h>
+#include <sys/stat.h>
+
+int
+normalizepath(const char *path, char **normal)
+{
+ size_t len = strlen(path);
+ *normal = (char *)malloc((len + 1) * sizeof(char));
+ const char *walk = path;
+ const char *match;
+ size_t newlen = 0;
+
+ while ((match = strchr(walk, '/'))) {
+ // Copy everything between match and walk
+ strncpy(*normal + newlen, walk, match - walk);
+ newlen += match - walk;
+ walk += match - walk;
+
+ // Skip all repeating slashes
+ while (*walk == '/')
+ walk++;
+
+ // If not last character in path
+ if (walk != path + len)
+ (*normal)[newlen++] = '/';
+ }
+
+ (*normal)[newlen++] = '\0';
+
+ // Copy remaining path
+ strcat(*normal, walk);
+ newlen += strlen(walk);
+
+ *normal = (char *)realloc(*normal, newlen * sizeof(char));
+
+ return 0;
+}
+
+int
+parentdir(const char *path, char **parent)
+{
+ char *normal;
+ char *walk;
+
+ normalizepath(path, &normal);
+
+ // Pointer to last '/'
+ if (!(walk = strrchr(normal, '/'))) {
+ free(normal);
+ return -1;
+ }
+
+ // Get path up to last '/'
+ size_t len = walk - normal;
+ *parent = (char *)malloc((len + 1) * sizeof(char));
+
+ // Copy path up to last '/'
+ strncpy(*parent, normal, len);
+ // Add null char
+ (*parent)[len] = '\0';
+
+ free(normal);
+
+ return 0;
+}
+
+int
+mkdirp(const char *path)
+{
+ char *normal;
+ char *walk;
+ size_t normallen;
+
+ normalizepath(path, &normal);
+ normallen = strlen(normal);
+ walk = normal;
+
+ while (walk < normal + normallen + 1) {
+ // Get length from walk to next /
+ size_t n = strcspn(walk, "/");
+
+ // Skip path /
+ if (n == 0) {
+ walk++;
+ continue;
+ }
+
+ // Length of current path segment
+ size_t curpathlen = walk - normal + n;
+ char curpath[curpathlen + 1];
+ struct stat s;
+
+ // Copy path segment to stat
+ strncpy(curpath, normal, curpathlen);
+ strcpy(curpath + curpathlen, "");
+ int res = stat(curpath, &s);
+
+ if (res < 0) {
+ if (errno == ENOENT) {
+ DEBUG("Making directory %s\n", curpath);
+ if (mkdir(curpath, 0700) < 0) {
+ fprintf(stderr, "Failed to make directory %s\n", curpath);
+ perror("");
+ free(normal);
+ return -1;
+ }
+ } else {
+ fprintf(stderr, "Error statting directory %s\n", curpath);
+ perror("");
+ free(normal);
+ return -1;
+ }
+ }
+
+ // Continue to next path segment
+ walk += n;
+ }
+
+ free(normal);
+
+ return 0;
+}
+
+int
+nullterminate(char **str, size_t *len)
+{
+ if ((*str)[*len - 1] == '\0')
+ return 0;
+
+ (*len)++;
+ *str = (char*)realloc(*str, *len * sizeof(char));
+ (*str)[*len - 1] = '\0';
+
+ return 0;
+}
+
diff --git a/patch/ipc/util.h b/patch/ipc/util.h
new file mode 100644
index 0000000..8d2a626
--- /dev/null
+++ b/patch/ipc/util.h
@@ -0,0 +1,5 @@
+int normalizepath(const char *path, char **normal);
+int mkdirp(const char *path);
+int parentdir(const char *path, char **parent);
+int nullterminate(char **str, size_t *len);
+
diff --git a/patch/ipc/yajl_dumps.c b/patch/ipc/yajl_dumps.c
new file mode 100644
index 0000000..b24a429
--- /dev/null
+++ b/patch/ipc/yajl_dumps.c
@@ -0,0 +1,356 @@
+#include "yajl_dumps.h"
+
+#include <stdint.h>
+
+int
+dump_tag(yajl_gen gen, const char *name, const int tag_mask)
+{
+ if (!name)
+ return 0;
+
+ // clang-format off
+ YMAP(
+ YSTR("bit_mask"); YINT(tag_mask);
+ YSTR("name"); YSTR(name);
+ )
+ // clang-format on
+ return 0;
+}
+
+int
+dump_tags(yajl_gen gen, int tags_len)
+{
+ // clang-format off
+ YARR(
+ for (int i = 0; i < tags_len; i++)
+ dump_tag(gen, tagicon(mons, i), 1 << i);
+ )
+ // clang-format on
+
+ return 0;
+}
+
+int
+dump_client(yajl_gen gen, Client *c)
+{
+ // clang-format off
+ YMAP(
+ YSTR("name"); YSTR(c->name);
+ YSTR("tags"); YINT(c->tags);
+ YSTR("window_id"); YINT(c->win);
+ YSTR("monitor_number"); YINT(c->mon->num);
+
+ YSTR("geometry"); YMAP(
+ YSTR("current"); YMAP (
+ YSTR("x"); YINT(c->x);
+ YSTR("y"); YINT(c->y);
+ YSTR("width"); YINT(c->w);
+ YSTR("height"); YINT(c->h);
+ )
+ YSTR("old"); YMAP(
+ YSTR("x"); YINT(c->oldx);
+ YSTR("y"); YINT(c->oldy);
+ YSTR("width"); YINT(c->oldw);
+ YSTR("height"); YINT(c->oldh);
+ )
+ )
+
+ YSTR("size_hints"); YMAP(
+ YSTR("base"); YMAP(
+ YSTR("width"); YINT(c->basew);
+ YSTR("height"); YINT(c->baseh);
+ )
+ YSTR("step"); YMAP(
+ YSTR("width"); YINT(c->incw);
+ YSTR("height"); YINT(c->inch);
+ )
+ YSTR("max"); YMAP(
+ YSTR("width"); YINT(c->maxw);
+ YSTR("height"); YINT(c->maxh);
+ )
+ YSTR("min"); YMAP(
+ YSTR("width"); YINT(c->minw);
+ YSTR("height"); YINT(c->minh);
+ )
+ YSTR("aspect_ratio"); YMAP(
+ YSTR("min"); YDOUBLE(c->mina);
+ YSTR("max"); YDOUBLE(c->maxa);
+ )
+ )
+
+ YSTR("border_width"); YMAP(
+ YSTR("current"); YINT(c->bw);
+ YSTR("old"); YINT(c->oldbw);
+ )
+
+ YSTR("states"); YMAP(
+ YSTR("is_fixed"); YBOOL(c->isfixed);
+ YSTR("is_floating"); YBOOL(c->isfloating);
+ YSTR("is_urgent"); YBOOL(c->isurgent);
+ YSTR("never_focus"); YBOOL(c->neverfocus);
+ YSTR("old_state"); YBOOL(c->oldstate);
+ YSTR("is_fullscreen"); YBOOL(c->isfullscreen);
+ )
+ )
+ // clang-format on
+
+ return 0;
+}
+
+int
+dump_monitor(yajl_gen gen, Monitor *mon, int is_selected)
+{
+ // clang-format off
+ YMAP(
+ YSTR("master_factor"); YDOUBLE(mon->mfact);
+ YSTR("num_master"); YINT(mon->nmaster);
+ YSTR("num"); YINT(mon->num);
+ YSTR("is_selected"); YBOOL(is_selected);
+
+ YSTR("monitor_geometry"); YMAP(
+ YSTR("x"); YINT(mon->mx);
+ YSTR("y"); YINT(mon->my);
+ YSTR("width"); YINT(mon->mw);
+ YSTR("height"); YINT(mon->mh);
+ )
+
+ YSTR("window_geometry"); YMAP(
+ YSTR("x"); YINT(mon->wx);
+ YSTR("y"); YINT(mon->wy);
+ YSTR("width"); YINT(mon->ww);
+ YSTR("height"); YINT(mon->wh);
+ )
+
+ YSTR("tagset"); YMAP(
+ YSTR("current"); YINT(mon->tagset[mon->seltags]);
+ YSTR("old"); YINT(mon->tagset[mon->seltags ^ 1]);
+ )
+
+ YSTR("tag_state"); dump_tag_state(gen, mon->tagstate);
+
+ YSTR("clients"); YMAP(
+ YSTR("selected"); YINT(mon->sel ? mon->sel->win : 0);
+ YSTR("stack"); YARR(
+ for (Client* c = mon->stack; c; c = c->snext)
+ YINT(c->win);
+ )
+ YSTR("all"); YARR(
+ for (Client* c = mon->clients; c; c = c->next)
+ YINT(c->win);
+ )
+ )
+
+ YSTR("layout"); YMAP(
+ YSTR("symbol"); YMAP(
+ YSTR("current"); YSTR(mon->ltsymbol);
+ YSTR("old"); YSTR(mon->lastltsymbol);
+ )
+ YSTR("address"); YMAP(
+ YSTR("current"); YINT((uintptr_t)mon->lt[mon->sellt]);
+ YSTR("old"); YINT((uintptr_t)mon->lt[mon->sellt ^ 1]);
+ )
+ )
+
+ if (mon->bar) {
+ YSTR("bar"); YMAP(
+ YSTR("y"); YINT(mon->bar->by);
+ YSTR("is_shown"); YBOOL(mon->showbar);
+ YSTR("is_top"); YBOOL(mon->bar->topbar);
+ YSTR("window_id"); YINT(mon->bar->win);
+ )
+ }
+ )
+ // clang-format on
+
+ return 0;
+}
+
+int
+dump_monitors(yajl_gen gen, Monitor *mons, Monitor *selmon)
+{
+ // clang-format off
+ YARR(
+ for (Monitor *mon = mons; mon; mon = mon->next) {
+ if (mon == selmon)
+ dump_monitor(gen, mon, 1);
+ else
+ dump_monitor(gen, mon, 0);
+ }
+ )
+ // clang-format on
+
+ return 0;
+}
+
+int
+dump_layouts(yajl_gen gen, const Layout layouts[], const int layouts_len)
+{
+ // clang-format off
+ YARR(
+ for (int i = 0; i < layouts_len; i++) {
+ YMAP(
+ // Check for a NULL pointer. The cycle layouts patch adds an entry at
+ // the end of the layouts array with a NULL pointer for the symbol
+ YSTR("symbol"); YSTR((layouts[i].symbol ? layouts[i].symbol : ""));
+ YSTR("address"); YINT((uintptr_t)(layouts + i));
+ )
+ }
+ )
+ // clang-format on
+
+ return 0;
+}
+
+int
+dump_tag_state(yajl_gen gen, TagState state)
+{
+ // clang-format off
+ YMAP(
+ YSTR("selected"); YINT(state.selected);
+ YSTR("occupied"); YINT(state.occupied);
+ YSTR("urgent"); YINT(state.urgent);
+ )
+ // clang-format on
+
+ return 0;
+}
+
+int
+dump_tag_event(yajl_gen gen, int mon_num, TagState old_state,
+ TagState new_state)
+{
+ // clang-format off
+ YMAP(
+ YSTR("tag_change_event"); YMAP(
+ YSTR("monitor_number"); YINT(mon_num);
+ YSTR("old_state"); dump_tag_state(gen, old_state);
+ YSTR("new_state"); dump_tag_state(gen, new_state);
+ )
+ )
+ // clang-format on
+
+ return 0;
+}
+
+int
+dump_client_focus_change_event(yajl_gen gen, Client *old_client,
+ Client *new_client, int mon_num)
+{
+ // clang-format off
+ YMAP(
+ YSTR("client_focus_change_event"); YMAP(
+ YSTR("monitor_number"); YINT(mon_num);
+ YSTR("old_win_id"); old_client == NULL ? YNULL() : YINT(old_client->win);
+ YSTR("new_win_id"); new_client == NULL ? YNULL() : YINT(new_client->win);
+ )
+ )
+ // clang-format on
+
+ return 0;
+}
+
+int
+dump_layout_change_event(yajl_gen gen, const int mon_num,
+ const char *old_symbol, const Layout *old_layout,
+ const char *new_symbol, const Layout *new_layout)
+{
+ // clang-format off
+ YMAP(
+ YSTR("layout_change_event"); YMAP(
+ YSTR("monitor_number"); YINT(mon_num);
+ YSTR("old_symbol"); YSTR(old_symbol);
+ YSTR("old_address"); YINT((uintptr_t)old_layout);
+ YSTR("new_symbol"); YSTR(new_symbol);
+ YSTR("new_address"); YINT((uintptr_t)new_layout);
+ )
+ )
+ // clang-format on
+
+ return 0;
+}
+
+int
+dump_monitor_focus_change_event(yajl_gen gen, const int last_mon_num,
+ const int new_mon_num)
+{
+ // clang-format off
+ YMAP(
+ YSTR("monitor_focus_change_event"); YMAP(
+ YSTR("old_monitor_number"); YINT(last_mon_num);
+ YSTR("new_monitor_number"); YINT(new_mon_num);
+ )
+ )
+ // clang-format on
+
+ return 0;
+}
+
+int
+dump_focused_title_change_event(yajl_gen gen, const int mon_num,
+ const Window client_id, const char *old_name,
+ const char *new_name)
+{
+ // clang-format off
+ YMAP(
+ YSTR("focused_title_change_event"); YMAP(
+ YSTR("monitor_number"); YINT(mon_num);
+ YSTR("client_window_id"); YINT(client_id);
+ YSTR("old_name"); YSTR(old_name);
+ YSTR("new_name"); YSTR(new_name);
+ )
+ )
+ // clang-format on
+
+ return 0;
+}
+
+int
+dump_client_state(yajl_gen gen, const ClientState *state)
+{
+ // clang-format off
+ YMAP(
+ YSTR("old_state"); YBOOL(state->oldstate);
+ YSTR("is_fixed"); YBOOL(state->isfixed);
+ YSTR("is_floating"); YBOOL(state->isfloating);
+ YSTR("is_fullscreen"); YBOOL(state->isfullscreen);
+ YSTR("is_urgent"); YBOOL(state->isurgent);
+ YSTR("never_focus"); YBOOL(state->neverfocus);
+ )
+ // clang-format on
+
+ return 0;
+}
+
+int
+dump_focused_state_change_event(yajl_gen gen, const int mon_num,
+ const Window client_id,
+ const ClientState *old_state,
+ const ClientState *new_state)
+{
+ // clang-format off
+ YMAP(
+ YSTR("focused_state_change_event"); YMAP(
+ YSTR("monitor_number"); YINT(mon_num);
+ YSTR("client_window_id"); YINT(client_id);
+ YSTR("old_state"); dump_client_state(gen, old_state);
+ YSTR("new_state"); dump_client_state(gen, new_state);
+ )
+ )
+ // clang-format on
+
+ return 0;
+}
+
+int
+dump_error_message(yajl_gen gen, const char *reason)
+{
+ // clang-format off
+ YMAP(
+ YSTR("result"); YSTR("error");
+ YSTR("reason"); YSTR(reason);
+ )
+ // clang-format on
+
+ return 0;
+}
+
diff --git a/patch/ipc/yajl_dumps.h b/patch/ipc/yajl_dumps.h
new file mode 100644
index 0000000..bb57a17
--- /dev/null
+++ b/patch/ipc/yajl_dumps.h
@@ -0,0 +1,66 @@
+#ifndef YAJL_DUMPS_H_
+#define YAJL_DUMPS_H_
+
+#include <string.h>
+#include <yajl/yajl_gen.h>
+
+#define YSTR(str) yajl_gen_string(gen, (unsigned char *)str, strlen(str))
+#define YINT(num) yajl_gen_integer(gen, num)
+#define YDOUBLE(num) yajl_gen_double(gen, num)
+#define YBOOL(v) yajl_gen_bool(gen, v)
+#define YNULL() yajl_gen_null(gen)
+#define YARR(body) \
+ { \
+ yajl_gen_array_open(gen); \
+ body; \
+ yajl_gen_array_close(gen); \
+ }
+#define YMAP(body) \
+ { \
+ yajl_gen_map_open(gen); \
+ body; \
+ yajl_gen_map_close(gen); \
+ }
+
+int dump_tag(yajl_gen gen, const char *name, const int tag_mask);
+
+int dump_tags(yajl_gen gen, int tags_len);
+
+int dump_client(yajl_gen gen, Client *c);
+
+int dump_monitor(yajl_gen gen, Monitor *mon, int is_selected);
+
+int dump_monitors(yajl_gen gen, Monitor *mons, Monitor *selmon);
+
+int dump_layouts(yajl_gen gen, const Layout layouts[], const int layouts_len);
+
+int dump_tag_state(yajl_gen gen, TagState state);
+
+int dump_tag_event(yajl_gen gen, int mon_num, TagState old_state,
+ TagState new_state);
+
+int dump_client_focus_change_event(yajl_gen gen, Client *old_client,
+ Client *new_client, int mon_num);
+
+int dump_layout_change_event(yajl_gen gen, const int mon_num,
+ const char *old_symbol, const Layout *old_layout,
+ const char *new_symbol, const Layout *new_layout);
+
+int dump_monitor_focus_change_event(yajl_gen gen, const int last_mon_num,
+ const int new_mon_num);
+
+int dump_focused_title_change_event(yajl_gen gen, const int mon_num,
+ const Window client_id,
+ const char *old_name, const char *new_name);
+
+int dump_client_state(yajl_gen gen, const ClientState *state);
+
+int dump_focused_state_change_event(yajl_gen gen, const int mon_num,
+ const Window client_id,
+ const ClientState *old_state,
+ const ClientState *new_state);
+
+int dump_error_message(yajl_gen gen, const char *reason);
+
+#endif // YAJL_DUMPS_H_
+
generated by cgit v1.2.1 (git 2.18.0) at 2025-12-12 12:01:52 +0000