ec926539a3
Use GLib's GError library for reporting output device failures. Note that some init() methods don't clean up properly after a failure, but that's ok for now, because the MPD core will abort anyway.
301 lines
6.0 KiB
C
301 lines
6.0 KiB
C
/* the Music Player Daemon (MPD)
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* Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
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* This project's homepage is: http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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 General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "../output_api.h"
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#include "../utils.h"
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#include "../timer.h"
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#include <glib.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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#undef G_LOG_DOMAIN
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#define G_LOG_DOMAIN "fifo"
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#define FIFO_BUFFER_SIZE 65536 /* pipe capacity on Linux >= 2.6.11 */
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struct fifo_data {
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char *path;
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int input;
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int output;
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bool created;
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Timer *timer;
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};
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/**
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* The quark used for GError.domain.
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*/
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static inline GQuark
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fifo_output_quark(void)
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{
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return g_quark_from_static_string("fifo_output");
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}
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static struct fifo_data *fifo_data_new(void)
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{
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struct fifo_data *ret;
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ret = g_new(struct fifo_data, 1);
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ret->path = NULL;
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ret->input = -1;
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ret->output = -1;
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ret->created = false;
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return ret;
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}
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static void fifo_data_free(struct fifo_data *fd)
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{
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g_free(fd->path);
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g_free(fd);
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}
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static void fifo_delete(struct fifo_data *fd)
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{
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g_debug("Removing FIFO \"%s\"", fd->path);
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if (unlink(fd->path) < 0) {
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g_warning("Could not remove FIFO \"%s\": %s",
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fd->path, strerror(errno));
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return;
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}
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fd->created = false;
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}
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static void
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fifo_close(struct fifo_data *fd)
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{
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struct stat st;
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if (fd->input >= 0) {
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close(fd->input);
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fd->input = -1;
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}
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if (fd->output >= 0) {
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close(fd->output);
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fd->output = -1;
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}
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if (fd->created && (stat(fd->path, &st) == 0))
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fifo_delete(fd);
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}
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static bool
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fifo_make(struct fifo_data *fd, GError **error)
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{
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if (mkfifo(fd->path, 0666) < 0) {
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g_set_error(error, fifo_output_quark(), errno,
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"Couldn't create FIFO \"%s\": %s",
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fd->path, strerror(errno));
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return false;
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}
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fd->created = true;
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return true;
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}
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static bool
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fifo_check(struct fifo_data *fd, GError **error)
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{
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struct stat st;
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if (stat(fd->path, &st) < 0) {
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if (errno == ENOENT) {
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/* Path doesn't exist */
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return fifo_make(fd, error);
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}
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g_set_error(error, fifo_output_quark(), errno,
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"Failed to stat FIFO \"%s\": %s",
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fd->path, strerror(errno));
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return false;
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}
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if (!S_ISFIFO(st.st_mode)) {
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g_set_error(error, fifo_output_quark(), 0,
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"\"%s\" already exists, but is not a FIFO",
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fd->path);
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return false;
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}
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return true;
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}
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static bool
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fifo_open(struct fifo_data *fd, GError **error)
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{
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if (!fifo_check(fd, error))
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return false;
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fd->input = open(fd->path, O_RDONLY|O_NONBLOCK);
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if (fd->input < 0) {
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g_set_error(error, fifo_output_quark(), errno,
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"Could not open FIFO \"%s\" for reading: %s",
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fd->path, strerror(errno));
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fifo_close(fd);
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return false;
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}
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fd->output = open(fd->path, O_WRONLY|O_NONBLOCK);
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if (fd->output < 0) {
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g_set_error(error, fifo_output_quark(), errno,
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"Could not open FIFO \"%s\" for writing: %s",
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fd->path, strerror(errno));
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fifo_close(fd);
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return false;
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}
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return true;
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}
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static void *
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fifo_output_init(G_GNUC_UNUSED const struct audio_format *audio_format,
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const struct config_param *param,
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GError **error)
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{
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struct fifo_data *fd;
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char *value, *path;
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value = config_dup_block_string(param, "path", NULL);
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if (value == NULL) {
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g_set_error(error, fifo_output_quark(), errno,
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"No \"path\" parameter specified");
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return NULL;
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}
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path = parsePath(value);
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g_free(value);
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if (!path) {
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g_set_error(error, fifo_output_quark(), errno,
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"Could not parse \"path\" parameter");
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return NULL;
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}
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fd = fifo_data_new();
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fd->path = path;
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if (!fifo_open(fd, error)) {
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fifo_data_free(fd);
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return NULL;
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}
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return fd;
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}
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static void
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fifo_output_finish(void *data)
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{
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struct fifo_data *fd = (struct fifo_data *)data;
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fifo_close(fd);
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fifo_data_free(fd);
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}
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static bool
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fifo_output_open(void *data, struct audio_format *audio_format,
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G_GNUC_UNUSED GError **error)
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{
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struct fifo_data *fd = (struct fifo_data *)data;
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fd->timer = timer_new(audio_format);
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return true;
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}
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static void
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fifo_output_close(void *data)
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{
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struct fifo_data *fd = (struct fifo_data *)data;
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timer_free(fd->timer);
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}
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static void
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fifo_output_cancel(void *data)
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{
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struct fifo_data *fd = (struct fifo_data *)data;
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char buf[FIFO_BUFFER_SIZE];
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int bytes = 1;
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timer_reset(fd->timer);
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while (bytes > 0 && errno != EINTR)
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bytes = read(fd->input, buf, FIFO_BUFFER_SIZE);
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if (bytes < 0 && errno != EAGAIN) {
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g_warning("Flush of FIFO \"%s\" failed: %s",
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fd->path, strerror(errno));
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}
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}
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static size_t
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fifo_output_play(void *data, const void *chunk, size_t size,
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GError **error)
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{
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struct fifo_data *fd = (struct fifo_data *)data;
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ssize_t bytes;
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if (!fd->timer->started)
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timer_start(fd->timer);
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else
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timer_sync(fd->timer);
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timer_add(fd->timer, size);
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while (true) {
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bytes = write(fd->output, chunk, size);
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if (bytes > 0)
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return (size_t)bytes;
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if (bytes < 0) {
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switch (errno) {
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case EAGAIN:
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/* The pipe is full, so empty it */
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fifo_output_cancel(fd);
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continue;
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case EINTR:
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continue;
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}
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g_set_error(error, fifo_output_quark(), errno,
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"Failed to write to FIFO %s: %s",
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fd->path, g_strerror(errno));
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return 0;
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}
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}
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}
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const struct audio_output_plugin fifo_output_plugin = {
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.name = "fifo",
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.init = fifo_output_init,
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.finish = fifo_output_finish,
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.open = fifo_output_open,
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.close = fifo_output_close,
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.play = fifo_output_play,
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.cancel = fifo_output_cancel,
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};
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