mpv/input/ipc-unix.c

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/*
* 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 <signal.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());
// We don't use MSG_NOSIGNAL because the moldy fruit OS doesn't support it.
struct sigaction sa = { .sa_handler = SIG_IGN, .sa_flags = SA_RESTART };
sigfillset(&sa.sa_mask);
sigaction(SIGPIPE, &sa, NULL);
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);
while (1) {
rc = poll(fds, 2, 0);
if (rc == 0)
rc = poll(fds, 2, -1);
if (rc < 0) {
MP_ERR(arg, "Poll error\n");
continue;
}
if (fds[0].revents & POLLIN) {
mp_flush_wakeup_pipe(pipe_fd);
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;
}
MP_VERBOSE(arg, "Listening to IPC socket.\n");
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;
(void)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);
}