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 --- sysdeps/unix/sysv/linux/gentempfd.c | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) create mode 100644 sysdeps/unix/sysv/linux/gentempfd.c (limited to 'sysdeps/unix') diff --git a/sysdeps/unix/sysv/linux/gentempfd.c b/sysdeps/unix/sysv/linux/gentempfd.c new file mode 100644 index 0000000000..902cbe286e --- /dev/null +++ b/sysdeps/unix/sysv/linux/gentempfd.c @@ -0,0 +1,34 @@ +/* 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 + . */ + +#include +#include +#include + +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) -- cgit 1.4.1