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linux: Implement tmpfile with O_TMPFILE (BZ#21530)

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This patch adds O_TMPFILE support to tmpfile on Linux.  This is
similar to the previous suggestion by Andreas Schwab [1] with the
difference the file descriptor creation is parameterized to
compartmentalize Linux only open flags (O_TMPFILE) on sysdeps.

Checked on x86_64-linux-gnu.

	Adhemerval Zanella  <adhemerval.zanella@linaro.org>
	Andreas Schwab  <schwab@suse.de>

	[BZ #21530]
	* include/stdio.h (__gen_tempfd): New function.
	* stdio-common/Makefile (routines): Add gentempfd.
	* stdio-common/gentempfd.c: New file.
	* sysdeps/unix/sysv/linux/gentempfd.c: Likewise.
	* stdio-common/tmpfile.c (tmpfile): First try to use a system specific
	unnamed file first.

[1] https://sourceware.org/ml/libc-alpha/2017-06/msg01293.html
This commit is contained in:
Adhemerval Zanella
2017-06-26 11:52:14 -03:00
parent da162bf234
commit e0d2eb5a79
6 changed files with 93 additions and 11 deletions
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34
sysdeps/unix/sysv/linux/gentempfd.c Normal file
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/* Generate a temporary file descriptor. Linux version.
Copyright (C) 2017 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library 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.
The GNU C Library 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 the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
int
__gen_tempfd (int flags)
{
int fd = __open (P_tmpdir, O_RDWR | O_TMPFILE | O_EXCL | flags,
S_IRUSR | S_IWUSR);
if (fd < 0 && errno == ENOENT && strcmp (P_tmpdir, "/tmp") != 0)
fd = __open ("/tmp", O_RDWR | O_TMPFILE | O_EXCL | flags,
S_IRUSR | S_IWUSR);
return fd;
}
libc_hidden_def (__gen_tempfd)