diff options
Diffstat (limited to 'input/ipc-unix.c')
| -rw-r--r-- | input/ipc-unix.c | 422 |
1 files changed, 422 insertions, 0 deletions
diff --git a/input/ipc-unix.c b/input/ipc-unix.c new file mode 100644 index 0000000000..8b8a158c5f --- /dev/null +++ b/input/ipc-unix.c @@ -0,0 +1,422 @@ +/* + * This file is part of mpv. + * + * mpv is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * mpv is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with mpv. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <pthread.h> +#include <errno.h> +#include <unistd.h> + +#include <poll.h> +#include <sys/types.h> +#include <sys/socket.h> +#include <sys/stat.h> +#include <sys/un.h> + +#include "config.h" + +#include "osdep/io.h" +#include "osdep/threads.h" + +#include "common/common.h" +#include "common/global.h" +#include "common/msg.h" +#include "input/input.h" +#include "libmpv/client.h" +#include "options/options.h" +#include "options/path.h" +#include "player/client.h" + +#ifndef MSG_NOSIGNAL +#define MSG_NOSIGNAL 0 +#endif + +struct mp_ipc_ctx { + struct mp_log *log; + struct mp_client_api *client_api; + const char *path; + + pthread_t thread; + int death_pipe[2]; +}; + +struct client_arg { + struct mp_log *log; + struct mpv_handle *client; + + char *client_name; + int client_fd; + bool close_client_fd; + + bool writable; +}; + +static int ipc_write_str(struct client_arg *client, const char *buf) +{ + size_t count = strlen(buf); + while (count > 0) { + ssize_t rc = send(client->client_fd, buf, count, MSG_NOSIGNAL); + if (rc <= 0) { + if (rc == 0) + return -1; + + if (errno == EBADF) { + client->writable = false; + return 0; + } + + if (errno == EINTR) + continue; + + if (errno == EAGAIN) + return 0; + + return rc; + } + + count -= rc; + buf += rc; + } + + return 0; +} + +static void *client_thread(void *p) +{ + pthread_detach(pthread_self()); + + int rc; + + struct client_arg *arg = p; + bstr client_msg = { talloc_strdup(NULL, ""), 0 }; + + mpthread_set_name(arg->client_name); + + int pipe_fd = mpv_get_wakeup_pipe(arg->client); + if (pipe_fd < 0) { + MP_ERR(arg, "Could not get wakeup pipe\n"); + goto done; + } + + MP_VERBOSE(arg, "Client connected\n"); + + struct pollfd fds[2] = { + {.events = POLLIN, .fd = pipe_fd}, + {.events = POLLIN, .fd = arg->client_fd}, + }; + + fcntl(arg->client_fd, F_SETFL, fcntl(arg->client_fd, F_GETFL, 0) | O_NONBLOCK); + mpv_suspend(arg->client); + + while (1) { + rc = poll(fds, 2, 0); + if (rc == 0) { + mpv_resume(arg->client); + rc = poll(fds, 2, -1); + mpv_suspend(arg->client); + } + if (rc < 0) { + MP_ERR(arg, "Poll error\n"); + continue; + } + + if (fds[0].revents & POLLIN) { + char discard[100]; + read(pipe_fd, discard, sizeof(discard)); + + while (1) { + mpv_event *event = mpv_wait_event(arg->client, 0); + + if (event->event_id == MPV_EVENT_NONE) + break; + + if (event->event_id == MPV_EVENT_SHUTDOWN) + goto done; + + if (!arg->writable) + continue; + + char *event_msg = mp_json_encode_event(event); + if (!event_msg) { + MP_ERR(arg, "Encoding error\n"); + goto done; + } + + rc = ipc_write_str(arg, event_msg); + talloc_free(event_msg); + if (rc < 0) { + MP_ERR(arg, "Write error (%s)\n", mp_strerror(errno)); + goto done; + } + } + } + + if (fds[1].revents & (POLLIN | POLLHUP)) { + while (1) { + char buf[128]; + bstr append = { buf, 0 }; + + ssize_t bytes = read(arg->client_fd, buf, sizeof(buf)); + if (bytes < 0) { + if (errno == EAGAIN) + break; + + MP_ERR(arg, "Read error (%s)\n", mp_strerror(errno)); + goto done; + } + + if (bytes == 0) { + MP_VERBOSE(arg, "Client disconnected\n"); + goto done; + } + + append.len = bytes; + + bstr_xappend(NULL, &client_msg, append); + + while (bstrchr(client_msg, '\n') != -1) { + char *reply_msg = mp_ipc_consume_next_command(arg->client, + NULL, &client_msg); + + if (reply_msg && arg->writable) { + rc = ipc_write_str(arg, reply_msg); + if (rc < 0) { + MP_ERR(arg, "Write error (%s)\n", mp_strerror(errno)); + talloc_free(reply_msg); + goto done; + } + } + + talloc_free(reply_msg); + } + } + } + } + +done: + if (client_msg.len > 0) + MP_WARN(arg, "Ignoring unterminated command on disconnect.\n"); + talloc_free(client_msg.start); + if (arg->close_client_fd) + close(arg->client_fd); + mpv_detach_destroy(arg->client); + talloc_free(arg); + return NULL; +} + +static void ipc_start_client(struct mp_ipc_ctx *ctx, struct client_arg *client) +{ + client->client = mp_new_client(ctx->client_api, client->client_name), + client->log = mp_client_get_log(client->client); + + pthread_t client_thr; + if (pthread_create(&client_thr, NULL, client_thread, client)) { + mpv_detach_destroy(client->client); + if (client->close_client_fd) + close(client->client_fd); + talloc_free(client); + } +} + +static void ipc_start_client_json(struct mp_ipc_ctx *ctx, int id, int fd) +{ + struct client_arg *client = talloc_ptrtype(NULL, client); + *client = (struct client_arg){ + .client_name = talloc_asprintf(client, "ipc-%d", id), + .client_fd = fd, + .close_client_fd = true, + + .writable = true, + }; + + ipc_start_client(ctx, client); +} + +static void ipc_start_client_text(struct mp_ipc_ctx *ctx, const char *path) +{ + int mode = O_RDONLY; + int client_fd = -1; + bool close_client_fd = true; + bool writable = false; + + if (strcmp(path, "/dev/stdin") == 0) { // for symmetry with Linux + client_fd = STDIN_FILENO; + close_client_fd = false; + } else if (strncmp(path, "fd://", 5) == 0) { + char *end = NULL; + client_fd = strtol(path + 5, &end, 0); + if (!end || end == path + 5 || end[0]) { + MP_ERR(ctx, "Invalid FD: %s\n", path); + return; + } + close_client_fd = false; + writable = true; // maybe + } else { + // Use RDWR for FIFOs to ensure they stay open over multiple accesses. + struct stat st; + if (stat(path, &st) == 0 && S_ISFIFO(st.st_mode)) + mode = O_RDWR; + client_fd = open(path, mode); + } + if (client_fd < 0) { + MP_ERR(ctx, "Could not open '%s'\n", path); + return; + } + + struct client_arg *client = talloc_ptrtype(NULL, client); + *client = (struct client_arg){ + .client_name = "input-file", + .client_fd = client_fd, + .close_client_fd = close_client_fd, + .writable = writable, + }; + + ipc_start_client(ctx, client); +} + +static void *ipc_thread(void *p) +{ + int rc; + + int ipc_fd; + struct sockaddr_un ipc_un = {0}; + + struct mp_ipc_ctx *arg = p; + + mpthread_set_name("ipc socket listener"); + + MP_VERBOSE(arg, "Starting IPC master\n"); + + ipc_fd = socket(AF_UNIX, SOCK_STREAM, 0); + if (ipc_fd < 0) { + MP_ERR(arg, "Could not create IPC socket\n"); + goto done; + } + +#if HAVE_FCHMOD + fchmod(ipc_fd, 0600); +#endif + + size_t path_len = strlen(arg->path); + if (path_len >= sizeof(ipc_un.sun_path) - 1) { + MP_ERR(arg, "Could not create IPC socket\n"); + goto done; + } + + ipc_un.sun_family = AF_UNIX, + strncpy(ipc_un.sun_path, arg->path, sizeof(ipc_un.sun_path)); + + unlink(ipc_un.sun_path); + + if (ipc_un.sun_path[0] == '@') { + ipc_un.sun_path[0] = '\0'; + path_len--; + } + + size_t addr_len = offsetof(struct sockaddr_un, sun_path) + 1 + path_len; + rc = bind(ipc_fd, (struct sockaddr *) &ipc_un, addr_len); + if (rc < 0) { + MP_ERR(arg, "Could not bind IPC socket\n"); + goto done; + } + + rc = listen(ipc_fd, 10); + if (rc < 0) { + MP_ERR(arg, "Could not listen on IPC socket\n"); + goto done; + } + + int client_num = 0; + + struct pollfd fds[2] = { + {.events = POLLIN, .fd = arg->death_pipe[0]}, + {.events = POLLIN, .fd = ipc_fd}, + }; + + while (1) { + rc = poll(fds, 2, -1); + if (rc < 0) { + MP_ERR(arg, "Poll error\n"); + continue; + } + + if (fds[0].revents & POLLIN) + goto done; + + if (fds[1].revents & POLLIN) { + int client_fd = accept(ipc_fd, NULL, NULL); + if (client_fd < 0) { + MP_ERR(arg, "Could not accept IPC client\n"); + goto done; + } + + ipc_start_client_json(arg, client_num++, client_fd); + } + } + +done: + if (ipc_fd >= 0) + close(ipc_fd); + + return NULL; +} + +struct mp_ipc_ctx *mp_init_ipc(struct mp_client_api *client_api, + struct mpv_global *global) +{ + struct MPOpts *opts = global->opts; + + struct mp_ipc_ctx *arg = talloc_ptrtype(NULL, arg); + *arg = (struct mp_ipc_ctx){ + .log = mp_log_new(arg, global->log, "ipc"), + .client_api = client_api, + .path = mp_get_user_path(arg, global, opts->ipc_path), + .death_pipe = {-1, -1}, + }; + char *input_file = mp_get_user_path(arg, global, opts->input_file); + + if (input_file && *input_file) + ipc_start_client_text(arg, input_file); + + if (!opts->ipc_path || !*opts->ipc_path) + goto out; + + if (mp_make_wakeup_pipe(arg->death_pipe) < 0) + goto out; + + if (pthread_create(&arg->thread, NULL, ipc_thread, arg)) + goto out; + + return arg; + +out: + close(arg->death_pipe[0]); + close(arg->death_pipe[1]); + talloc_free(arg); + return NULL; +} + +void mp_uninit_ipc(struct mp_ipc_ctx *arg) +{ + if (!arg) + return; + + write(arg->death_pipe[1], &(char){0}, 1); + pthread_join(arg->thread, NULL); + + close(arg->death_pipe[0]); + close(arg->death_pipe[1]); + talloc_free(arg); +} |