From e3af0032b236dc52d4a74c4d740e57a1f6d520aa Mon Sep 17 00:00:00 2001 From: Max Kellermann Date: Sat, 7 Nov 2009 18:55:16 +0100 Subject: set the close-on-exec flag on all file descriptors 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. --- src/fd_util.h | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+) create mode 100644 src/fd_util.h (limited to 'src/fd_util.h') diff --git a/src/fd_util.h b/src/fd_util.h new file mode 100644 index 00000000..805d1cc3 --- /dev/null +++ b/src/fd_util.h @@ -0,0 +1,53 @@ +/* + * Copyright (C) 2003-2009 The Music Player Daemon Project + * http://www.musicpd.org + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +/* + * This library provides easy helper functions for working with file + * descriptors. It has wrappers for taking advantage of Linux 2.6 + * specific features like O_CLOEXEC. + * + */ + +#ifndef FD_UTIL_H +#define FD_UTIL_H + +#include +#include + +struct sockaddr; + +int +fd_set_cloexec(int fd, bool enable); + +int +open_cloexec(const char *path_fs, int flags); + +int +creat_cloexec(const char *path_fs, int mode); + +int +pipe_cloexec(int fd[2]); + +int +socket_cloexec(int domain, int type, int protocol); + +int +accept_cloexec(int fd, struct sockaddr *address, size_t *address_length_r); + +#endif -- cgit v1.2.3