lib/glibc
1
0
Fork 0
mirror of https://sourceware.org/git/glibc.git synced 2025-07-28 00:21:52 +03:00
Code Activity

linux: Implement tmpfile with O_TMPFILE (BZ#21530)

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

28
stdio-common/tmpfile.c
View File

@ -34,23 +34,31 @@
FILE *
tmpfile (void)
{
char buf[FILENAME_MAX];
int fd;
FILE *f;
if (__path_search (buf, FILENAME_MAX, NULL, "tmpf", 0))
return NULL;
int flags = 0;
#ifdef FLAGS
flags = FLAGS;
#endif
fd = __gen_tempname (buf, 0, flags, __GT_FILE);
if (fd < 0)
return NULL;
/* Note that this relies on the Unix semantics that
a file is not really removed until it is closed. */
(void) __unlink (buf);
/* First try a system specific method. */
fd = __gen_tempfd (flags);
if (fd < 0)
{
char buf[FILENAME_MAX];
if (__path_search (buf, sizeof buf, NULL, "tmpf", 0))
return NULL;
fd = __gen_tempname (buf, 0, flags, __GT_FILE);
if (fd < 0)
return NULL;
/* Note that this relies on the Unix semantics that
a file is not really removed until it is closed. */
(void) __unlink (buf);
}
if ((f = __fdopen (fd, "w+b")) == NULL)
__close (fd);