From e0d2eb5a798613f9c24ad0056da86c8cfd19043d Mon Sep 17 00:00:00 2001 From: Adhemerval Zanella Date: Mon, 26 Jun 2017 11:52:14 -0300 Subject: linux: Implement tmpfile with O_TMPFILE (BZ#21530) 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 Andreas Schwab [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 --- stdio-common/tmpfile.c | 26 +++++++++++++++++--------- 1 file changed, 17 insertions(+), 9 deletions(-) (limited to 'stdio-common/tmpfile.c') diff --git a/stdio-common/tmpfile.c b/stdio-common/tmpfile.c index e6030be0af..c5cbb688f4 100644 --- a/stdio-common/tmpfile.c +++ b/stdio-common/tmpfile.c @@ -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); + + /* First try a system specific method. */ + fd = __gen_tempfd (flags); + if (fd < 0) - return NULL; + { + 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); + /* 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); -- cgit v1.2.3