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glibc/stdio-common/tmpfile.c
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/* Open a stdio stream on an anonymous temporary file. Generic/POSIX version. | |
Copyright (C) 1991-2016 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 <fcntl.h> | |
#include <stdio.h> | |
#include <unistd.h> | |
#include <iolibio.h> | |
#define __fdopen _IO_fdopen | |
#ifndef tmpfile | |
# define tmpfile __new_tmpfile | |
#endif | |
/* This returns a new stream opened on a temporary file (generated | |
by tmpnam). The file is opened with mode "w+b" (binary read/write). | |
If we couldn't generate a unique filename or the file couldn't | |
be opened, NULL is returned. */ | |
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); | |
if ((f = __fdopen (fd, "w+b")) == NULL) | |
__close (fd); | |
return f; | |
} | |
#if !defined O_LARGEFILE || O_LARGEFILE == 0 | |
weak_alias (__new_tmpfile, tmpfile64) | |
#endif | |
#ifndef FLAGS /* Not for tmpfile64. */ | |
# undef tmpfile | |
# include <shlib-compat.h> | |
versioned_symbol (libc, __new_tmpfile, tmpfile, GLIBC_2_1); | |
#endif |