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authorMax Kellermann <max@duempel.org>2009-11-07 18:55:16 +0100
committerMax Kellermann <max@duempel.org>2009-11-07 18:55:16 +0100
commite3af0032b236dc52d4a74c4d740e57a1f6d520aa (patch)
tree3984233a9b639e71ad80b4f6598539de3a27a008 /src/fd_util.h
parent9b21152600071ec46c021c8ba3b2ef69c90f039f (diff)
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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.
Diffstat (limited to '')
-rw-r--r--src/fd_util.h53
1 files changed, 53 insertions, 0 deletions
diff --git a/src/fd_util.h b/src/fd_util.h
new file mode 100644
index 000000000..805d1cc3d
--- /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 <stdbool.h>
+#include <stddef.h>
+
+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