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      1 /*	$NetBSD: tmpfile.c,v 1.12 2012/03/15 18:22:30 christos 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
     38 static char sccsid[] = "@(#)tmpfile.c	8.1 (Berkeley) 6/4/93";
     39 #else
     40 __RCSID("$NetBSD: tmpfile.c,v 1.12 2012/03/15 18:22:30 christos 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 
     54 FILE *
     55 tmpfile(void)
     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