e3af0032b2
Added the "fd_util" library, which attempts to use the new thread-safe Linux system calls pipe2(), accept4() and the options O_CLOEXEC, SOCK_CLOEXEC. Without these, it falls back to FD_CLOEXEC, which is not thread safe. This is particularly important for the "pipe" output plugin (and others, such as JACK/PulseAudio), because we were heavily leaking file descriptors to child processes.
151 lines
3.1 KiB
C
151 lines
3.1 KiB
C
/*
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* Copyright (C) 2003-2009 The Music Player Daemon Project
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* 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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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h" /* must be first for large file support */
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#include "input/file_input_plugin.h"
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#include "input_plugin.h"
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#include "fd_util.h"
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include <glib.h>
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#undef G_LOG_DOMAIN
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#define G_LOG_DOMAIN "input_file"
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static bool
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input_file_open(struct input_stream *is, const char *filename)
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{
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int fd, ret;
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struct stat st;
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char* pathname = g_strdup(filename);
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if (!g_path_is_absolute(filename))
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{
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g_free(pathname);
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return false;
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}
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if (stat(filename, &st) < 0) {
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char* slash = strrchr(pathname, '/');
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*slash = '\0';
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}
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fd = open_cloexec(pathname, O_RDONLY);
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if (fd < 0) {
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is->error = errno;
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g_debug("Failed to open \"%s\": %s",
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pathname, g_strerror(errno));
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g_free(pathname);
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return false;
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}
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is->seekable = true;
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ret = fstat(fd, &st);
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if (ret < 0) {
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is->error = errno;
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close(fd);
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g_free(pathname);
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return false;
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}
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if (!S_ISREG(st.st_mode)) {
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g_debug("Not a regular file: %s", pathname);
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is->error = EINVAL;
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close(fd);
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g_free(pathname);
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return false;
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}
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is->size = st.st_size;
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#ifdef POSIX_FADV_SEQUENTIAL
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posix_fadvise(fd, (off_t)0, is->size, POSIX_FADV_SEQUENTIAL);
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#endif
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is->plugin = &input_plugin_file;
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is->data = GINT_TO_POINTER(fd);
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is->ready = true;
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g_free(pathname);
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return true;
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}
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static bool
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input_file_seek(struct input_stream *is, goffset offset, int whence)
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{
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int fd = GPOINTER_TO_INT(is->data);
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offset = (goffset)lseek(fd, (off_t)offset, whence);
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if (offset < 0) {
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is->error = errno;
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return false;
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}
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is->offset = offset;
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return true;
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}
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static size_t
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input_file_read(struct input_stream *is, void *ptr, size_t size)
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{
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int fd = GPOINTER_TO_INT(is->data);
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ssize_t nbytes;
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nbytes = read(fd, ptr, size);
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if (nbytes < 0) {
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is->error = errno;
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g_debug("input_file_read: error reading: %s\n",
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strerror(is->error));
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return 0;
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}
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is->offset += nbytes;
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return (size_t)nbytes;
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}
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static void
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input_file_close(struct input_stream *is)
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{
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int fd = GPOINTER_TO_INT(is->data);
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close(fd);
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}
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static bool
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input_file_eof(struct input_stream *is)
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{
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return is->offset >= is->size;
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}
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const struct input_plugin input_plugin_file = {
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.name = "file",
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.open = input_file_open,
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.close = input_file_close,
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.read = input_file_read,
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.eof = input_file_eof,
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.seek = input_file_seek,
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};
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