mirror of
https://github.com/mpv-player/mpv
synced 2024-12-30 19:22:11 +00:00
b7d0dfaf1a
Fixes #4452.
423 lines
11 KiB
C
423 lines
11 KiB
C
/*
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* This file is part of mpv.
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*
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* mpv is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* mpv is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <pthread.h>
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#include <errno.h>
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#include <unistd.h>
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#include <poll.h>
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#include <signal.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/un.h>
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#include "config.h"
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#include "osdep/io.h"
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#include "osdep/threads.h"
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#include "common/common.h"
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#include "common/global.h"
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#include "common/msg.h"
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#include "input/input.h"
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#include "libmpv/client.h"
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#include "options/options.h"
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#include "options/path.h"
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#include "player/client.h"
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#ifndef MSG_NOSIGNAL
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#define MSG_NOSIGNAL 0
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#endif
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struct mp_ipc_ctx {
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struct mp_log *log;
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struct mp_client_api *client_api;
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const char *path;
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pthread_t thread;
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int death_pipe[2];
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};
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struct client_arg {
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struct mp_log *log;
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struct mpv_handle *client;
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char *client_name;
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int client_fd;
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bool close_client_fd;
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bool writable;
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};
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static int ipc_write_str(struct client_arg *client, const char *buf)
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{
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size_t count = strlen(buf);
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while (count > 0) {
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ssize_t rc = send(client->client_fd, buf, count, MSG_NOSIGNAL);
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if (rc <= 0) {
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if (rc == 0)
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return -1;
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if (errno == EBADF) {
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client->writable = false;
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return 0;
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}
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if (errno == EINTR || errno == EAGAIN)
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continue;
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return rc;
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}
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count -= rc;
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buf += rc;
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}
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return 0;
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}
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static void *client_thread(void *p)
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{
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pthread_detach(pthread_self());
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// We don't use MSG_NOSIGNAL because the moldy fruit OS doesn't support it.
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struct sigaction sa = { .sa_handler = SIG_IGN, .sa_flags = SA_RESTART };
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sigfillset(&sa.sa_mask);
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sigaction(SIGPIPE, &sa, NULL);
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int rc;
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struct client_arg *arg = p;
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bstr client_msg = { talloc_strdup(NULL, ""), 0 };
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mpthread_set_name(arg->client_name);
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int pipe_fd = mpv_get_wakeup_pipe(arg->client);
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if (pipe_fd < 0) {
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MP_ERR(arg, "Could not get wakeup pipe\n");
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goto done;
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}
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MP_VERBOSE(arg, "Client connected\n");
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struct pollfd fds[2] = {
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{.events = POLLIN, .fd = pipe_fd},
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{.events = POLLIN, .fd = arg->client_fd},
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};
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fcntl(arg->client_fd, F_SETFL, fcntl(arg->client_fd, F_GETFL, 0) | O_NONBLOCK);
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while (1) {
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rc = poll(fds, 2, 0);
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if (rc == 0)
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rc = poll(fds, 2, -1);
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if (rc < 0) {
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MP_ERR(arg, "Poll error\n");
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continue;
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}
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if (fds[0].revents & POLLIN) {
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mp_flush_wakeup_pipe(pipe_fd);
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while (1) {
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mpv_event *event = mpv_wait_event(arg->client, 0);
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if (event->event_id == MPV_EVENT_NONE)
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break;
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if (event->event_id == MPV_EVENT_SHUTDOWN)
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goto done;
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if (!arg->writable)
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continue;
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char *event_msg = mp_json_encode_event(event);
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if (!event_msg) {
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MP_ERR(arg, "Encoding error\n");
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goto done;
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}
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rc = ipc_write_str(arg, event_msg);
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talloc_free(event_msg);
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if (rc < 0) {
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MP_ERR(arg, "Write error (%s)\n", mp_strerror(errno));
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goto done;
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}
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}
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}
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if (fds[1].revents & (POLLIN | POLLHUP)) {
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while (1) {
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char buf[128];
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bstr append = { buf, 0 };
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ssize_t bytes = read(arg->client_fd, buf, sizeof(buf));
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if (bytes < 0) {
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if (errno == EAGAIN)
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break;
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MP_ERR(arg, "Read error (%s)\n", mp_strerror(errno));
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goto done;
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}
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if (bytes == 0) {
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MP_VERBOSE(arg, "Client disconnected\n");
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goto done;
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}
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append.len = bytes;
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bstr_xappend(NULL, &client_msg, append);
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while (bstrchr(client_msg, '\n') != -1) {
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char *reply_msg = mp_ipc_consume_next_command(arg->client,
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NULL, &client_msg);
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if (reply_msg && arg->writable) {
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rc = ipc_write_str(arg, reply_msg);
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if (rc < 0) {
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MP_ERR(arg, "Write error (%s)\n", mp_strerror(errno));
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talloc_free(reply_msg);
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goto done;
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}
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}
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talloc_free(reply_msg);
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}
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}
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}
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}
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done:
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if (client_msg.len > 0)
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MP_WARN(arg, "Ignoring unterminated command on disconnect.\n");
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talloc_free(client_msg.start);
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if (arg->close_client_fd)
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close(arg->client_fd);
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mpv_detach_destroy(arg->client);
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talloc_free(arg);
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return NULL;
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}
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static void ipc_start_client(struct mp_ipc_ctx *ctx, struct client_arg *client)
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{
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client->client = mp_new_client(ctx->client_api, client->client_name),
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client->log = mp_client_get_log(client->client);
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pthread_t client_thr;
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if (pthread_create(&client_thr, NULL, client_thread, client)) {
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mpv_detach_destroy(client->client);
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if (client->close_client_fd)
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close(client->client_fd);
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talloc_free(client);
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}
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}
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static void ipc_start_client_json(struct mp_ipc_ctx *ctx, int id, int fd)
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{
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struct client_arg *client = talloc_ptrtype(NULL, client);
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*client = (struct client_arg){
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.client_name = talloc_asprintf(client, "ipc-%d", id),
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.client_fd = fd,
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.close_client_fd = true,
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.writable = true,
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};
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ipc_start_client(ctx, client);
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}
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static void ipc_start_client_text(struct mp_ipc_ctx *ctx, const char *path)
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{
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int mode = O_RDONLY;
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int client_fd = -1;
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bool close_client_fd = true;
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bool writable = false;
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if (strcmp(path, "/dev/stdin") == 0) { // for symmetry with Linux
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client_fd = STDIN_FILENO;
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close_client_fd = false;
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} else if (strncmp(path, "fd://", 5) == 0) {
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char *end = NULL;
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client_fd = strtol(path + 5, &end, 0);
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if (!end || end == path + 5 || end[0]) {
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MP_ERR(ctx, "Invalid FD: %s\n", path);
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return;
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}
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close_client_fd = false;
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writable = true; // maybe
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} else {
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// Use RDWR for FIFOs to ensure they stay open over multiple accesses.
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struct stat st;
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if (stat(path, &st) == 0 && S_ISFIFO(st.st_mode))
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mode = O_RDWR;
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client_fd = open(path, mode);
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}
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if (client_fd < 0) {
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MP_ERR(ctx, "Could not open '%s'\n", path);
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return;
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}
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struct client_arg *client = talloc_ptrtype(NULL, client);
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*client = (struct client_arg){
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.client_name = "input-file",
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.client_fd = client_fd,
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.close_client_fd = close_client_fd,
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.writable = writable,
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};
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ipc_start_client(ctx, client);
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}
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static void *ipc_thread(void *p)
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{
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int rc;
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int ipc_fd;
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struct sockaddr_un ipc_un = {0};
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struct mp_ipc_ctx *arg = p;
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mpthread_set_name("ipc socket listener");
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MP_VERBOSE(arg, "Starting IPC master\n");
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ipc_fd = socket(AF_UNIX, SOCK_STREAM, 0);
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if (ipc_fd < 0) {
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MP_ERR(arg, "Could not create IPC socket\n");
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goto done;
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}
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#if HAVE_FCHMOD
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fchmod(ipc_fd, 0600);
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#endif
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size_t path_len = strlen(arg->path);
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if (path_len >= sizeof(ipc_un.sun_path) - 1) {
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MP_ERR(arg, "Could not create IPC socket\n");
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goto done;
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}
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ipc_un.sun_family = AF_UNIX,
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strncpy(ipc_un.sun_path, arg->path, sizeof(ipc_un.sun_path));
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unlink(ipc_un.sun_path);
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if (ipc_un.sun_path[0] == '@') {
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ipc_un.sun_path[0] = '\0';
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path_len--;
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}
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size_t addr_len = offsetof(struct sockaddr_un, sun_path) + 1 + path_len;
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rc = bind(ipc_fd, (struct sockaddr *) &ipc_un, addr_len);
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if (rc < 0) {
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MP_ERR(arg, "Could not bind IPC socket\n");
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goto done;
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}
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rc = listen(ipc_fd, 10);
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if (rc < 0) {
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MP_ERR(arg, "Could not listen on IPC socket\n");
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goto done;
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}
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MP_VERBOSE(arg, "Listening to IPC socket.\n");
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int client_num = 0;
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struct pollfd fds[2] = {
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{.events = POLLIN, .fd = arg->death_pipe[0]},
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{.events = POLLIN, .fd = ipc_fd},
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};
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while (1) {
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rc = poll(fds, 2, -1);
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if (rc < 0) {
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MP_ERR(arg, "Poll error\n");
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continue;
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}
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if (fds[0].revents & POLLIN)
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goto done;
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if (fds[1].revents & POLLIN) {
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int client_fd = accept(ipc_fd, NULL, NULL);
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if (client_fd < 0) {
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MP_ERR(arg, "Could not accept IPC client\n");
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goto done;
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}
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ipc_start_client_json(arg, client_num++, client_fd);
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}
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}
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done:
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if (ipc_fd >= 0)
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close(ipc_fd);
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return NULL;
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}
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struct mp_ipc_ctx *mp_init_ipc(struct mp_client_api *client_api,
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struct mpv_global *global)
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{
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struct MPOpts *opts = global->opts;
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struct mp_ipc_ctx *arg = talloc_ptrtype(NULL, arg);
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*arg = (struct mp_ipc_ctx){
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.log = mp_log_new(arg, global->log, "ipc"),
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.client_api = client_api,
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.path = mp_get_user_path(arg, global, opts->ipc_path),
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.death_pipe = {-1, -1},
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};
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char *input_file = mp_get_user_path(arg, global, opts->input_file);
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if (input_file && *input_file)
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ipc_start_client_text(arg, input_file);
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if (!opts->ipc_path || !*opts->ipc_path)
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goto out;
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if (mp_make_wakeup_pipe(arg->death_pipe) < 0)
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goto out;
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if (pthread_create(&arg->thread, NULL, ipc_thread, arg))
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goto out;
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return arg;
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out:
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close(arg->death_pipe[0]);
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close(arg->death_pipe[1]);
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talloc_free(arg);
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return NULL;
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}
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void mp_uninit_ipc(struct mp_ipc_ctx *arg)
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{
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if (!arg)
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return;
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(void)write(arg->death_pipe[1], &(char){0}, 1);
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pthread_join(arg->thread, NULL);
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close(arg->death_pipe[0]);
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close(arg->death_pipe[1]);
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talloc_free(arg);
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}
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