* malloc/memusage.sh (memusageso): Add quotes.
[glibc.git] / stdio-common / tmpfile.c
blob41f12bc8ba3eef8d3cf97da0da2448b1c804dd4b
1 /* Open a stdio stream on an anonymous temporary file. Generic/POSIX version.
2 Copyright (C) 1991,93,1996-2000,2002,2003 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18 02111-1307 USA. */
20 #include <stdio.h>
21 #include <unistd.h>
23 #ifdef USE_IN_LIBIO
24 # include <iolibio.h>
25 # define __fdopen INTUSE(_IO_fdopen)
26 # ifndef tmpfile
27 # define tmpfile __new_tmpfile
28 # endif
29 #endif
31 #ifndef GEN_THIS
32 # define GEN_THIS __GT_FILE
33 #endif
35 /* This returns a new stream opened on a temporary file (generated
36 by tmpnam). The file is opened with mode "w+b" (binary read/write).
37 If we couldn't generate a unique filename or the file couldn't
38 be opened, NULL is returned. */
39 FILE *
40 tmpfile (void)
42 char buf[FILENAME_MAX];
43 int fd;
44 FILE *f;
46 if (__path_search (buf, FILENAME_MAX, NULL, "tmpf", 0))
47 return NULL;
48 fd = __gen_tempname (buf, GEN_THIS);
49 if (fd < 0)
50 return NULL;
52 /* Note that this relies on the Unix semantics that
53 a file is not really removed until it is closed. */
54 (void) __unlink (buf);
56 if ((f = __fdopen (fd, "w+b")) == NULL)
57 __close (fd);
59 return f;
62 #if defined USE_IN_LIBIO && GEN_THIS == __GT_FILE /* Not for tmpfile64. */
63 # undef tmpfile
64 # include <shlib-compat.h>
65 versioned_symbol (libc, __new_tmpfile, tmpfile, GLIBC_2_1);
66 #endif