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e0d2eb5a79
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
78 lines
2.1 KiB
C
78 lines
2.1 KiB
C
/* Open a stdio stream on an anonymous temporary file. Generic/POSIX version.
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Copyright (C) 1991-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <fcntl.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <iolibio.h>
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#define __fdopen _IO_fdopen
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#ifndef tmpfile
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# define tmpfile __new_tmpfile
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#endif
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/* This returns a new stream opened on a temporary file (generated
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by tmpnam). The file is opened with mode "w+b" (binary read/write).
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If we couldn't generate a unique filename or the file couldn't
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be opened, NULL is returned. */
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FILE *
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tmpfile (void)
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{
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int fd;
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FILE *f;
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int flags = 0;
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#ifdef FLAGS
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flags = FLAGS;
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#endif
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/* First try a system specific method. */
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fd = __gen_tempfd (flags);
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if (fd < 0)
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{
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char buf[FILENAME_MAX];
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if (__path_search (buf, sizeof buf, NULL, "tmpf", 0))
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return NULL;
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fd = __gen_tempname (buf, 0, flags, __GT_FILE);
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if (fd < 0)
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return NULL;
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/* Note that this relies on the Unix semantics that
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a file is not really removed until it is closed. */
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(void) __unlink (buf);
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}
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if ((f = __fdopen (fd, "w+b")) == NULL)
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__close (fd);
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return f;
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}
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#if !defined O_LARGEFILE || O_LARGEFILE == 0
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weak_alias (__new_tmpfile, tmpfile64)
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#endif
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#ifndef FLAGS /* Not for tmpfile64. */
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# undef tmpfile
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# include <shlib-compat.h>
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versioned_symbol (libc, __new_tmpfile, tmpfile, GLIBC_2_1);
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#endif
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