1/*	$NetBSD: tmpfile.c,v 1.10 2003/01/18 11:29:58 thorpej Exp $	*/
2
3/*-
4 * Copyright (c) 1990, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Chris Torek.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include <sys/cdefs.h>
36#if defined(LIBC_SCCS) && !defined(lint)
37#if 0
38static char sccsid[] = "@(#)tmpfile.c	8.1 (Berkeley) 6/4/93";
39#else
40__RCSID("$NetBSD: tmpfile.c,v 1.10 2003/01/18 11:29:58 thorpej Exp $");
41#endif
42#endif /* LIBC_SCCS and not lint */
43
44#include "namespace.h"
45#include <sys/types.h>
46#include <unistd.h>
47#include <signal.h>
48#include <errno.h>
49#include <stdio.h>
50#include <stdlib.h>
51#include <string.h>
52#include <paths.h>
53
54FILE *
55tmpfile()
56{
57	sigset_t set, oset;
58	FILE *fp;
59	int fd, sverrno;
60#define	TRAILER	"tmp.XXXXXXXXXX"
61	char buf[sizeof(_PATH_TMP) + sizeof(TRAILER)];
62
63	(void)memcpy(buf, _PATH_TMP, sizeof(_PATH_TMP) - 1);
64	(void)memcpy(buf + sizeof(_PATH_TMP) - 1, TRAILER, sizeof(TRAILER));
65
66	sigfillset(&set);
67	(void)sigprocmask(SIG_BLOCK, &set, &oset);
68
69	fd = mkstemp(buf);
70	if (fd != -1)
71		(void)unlink(buf);
72
73	(void)sigprocmask(SIG_SETMASK, &oset, NULL);
74
75	if (fd == -1)
76		return (NULL);
77
78	if ((fp = fdopen(fd, "w+")) == NULL) {
79		sverrno = errno;
80		(void)close(fd);
81		errno = sverrno;
82		return (NULL);
83	}
84	return (fp);
85}
86