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tmpfile.c revision 1.5.2.1
      1  1.5.2.1  jtc /*	$NetBSD: tmpfile.c,v 1.5.2.1 1995/03/02 20:24:13 jtc Exp $	*/
      2      1.5  jtc 
      3      1.1  cgd /*-
      4      1.5  jtc  * Copyright (c) 1990, 1993
      5      1.5  jtc  *	The Regents of the University of California.  All rights reserved.
      6      1.1  cgd  *
      7      1.1  cgd  * This code is derived from software contributed to Berkeley by
      8      1.1  cgd  * Chris Torek.
      9      1.1  cgd  *
     10      1.1  cgd  * Redistribution and use in source and binary forms, with or without
     11      1.1  cgd  * modification, are permitted provided that the following conditions
     12      1.1  cgd  * are met:
     13      1.1  cgd  * 1. Redistributions of source code must retain the above copyright
     14      1.1  cgd  *    notice, this list of conditions and the following disclaimer.
     15      1.1  cgd  * 2. Redistributions in binary form must reproduce the above copyright
     16      1.1  cgd  *    notice, this list of conditions and the following disclaimer in the
     17      1.1  cgd  *    documentation and/or other materials provided with the distribution.
     18      1.1  cgd  * 3. All advertising materials mentioning features or use of this software
     19      1.1  cgd  *    must display the following acknowledgement:
     20      1.1  cgd  *	This product includes software developed by the University of
     21      1.1  cgd  *	California, Berkeley and its contributors.
     22      1.1  cgd  * 4. Neither the name of the University nor the names of its contributors
     23      1.1  cgd  *    may be used to endorse or promote products derived from this software
     24      1.1  cgd  *    without specific prior written permission.
     25      1.1  cgd  *
     26      1.1  cgd  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     27      1.1  cgd  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     28      1.1  cgd  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     29      1.1  cgd  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     30      1.1  cgd  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     31      1.1  cgd  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     32      1.1  cgd  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33      1.1  cgd  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34      1.1  cgd  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35      1.1  cgd  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36      1.1  cgd  * SUCH DAMAGE.
     37      1.1  cgd  */
     38      1.1  cgd 
     39      1.1  cgd #if defined(LIBC_SCCS) && !defined(lint)
     40      1.5  jtc #if 0
     41      1.5  jtc static char sccsid[] = "@(#)tmpfile.c	8.1 (Berkeley) 6/4/93";
     42      1.5  jtc #endif
     43  1.5.2.1  jtc static char rcsid[] = "$NetBSD: tmpfile.c,v 1.5.2.1 1995/03/02 20:24:13 jtc Exp $";
     44      1.1  cgd #endif /* LIBC_SCCS and not lint */
     45      1.1  cgd 
     46  1.5.2.1  jtc #include "namespace.h"
     47      1.1  cgd #include <sys/types.h>
     48      1.4  jtc #include <unistd.h>
     49      1.1  cgd #include <signal.h>
     50      1.1  cgd #include <errno.h>
     51      1.1  cgd #include <stdio.h>
     52      1.4  jtc #include <string.h>
     53      1.1  cgd #include <paths.h>
     54      1.1  cgd 
     55      1.1  cgd FILE *
     56      1.1  cgd tmpfile()
     57      1.1  cgd {
     58      1.1  cgd 	sigset_t set, oset;
     59      1.1  cgd 	FILE *fp;
     60      1.1  cgd 	int fd, sverrno;
     61      1.1  cgd #define	TRAILER	"tmp.XXXXXX"
     62      1.1  cgd 	char buf[sizeof(_PATH_TMP) + sizeof(TRAILER)];
     63      1.1  cgd 
     64      1.5  jtc 	(void)memcpy(buf, _PATH_TMP, sizeof(_PATH_TMP) - 1);
     65      1.5  jtc 	(void)memcpy(buf + sizeof(_PATH_TMP) - 1, TRAILER, sizeof(TRAILER));
     66      1.1  cgd 
     67      1.1  cgd 	sigfillset(&set);
     68      1.1  cgd 	(void)sigprocmask(SIG_BLOCK, &set, &oset);
     69      1.1  cgd 
     70      1.1  cgd 	fd = mkstemp(buf);
     71      1.1  cgd 	if (fd != -1)
     72      1.1  cgd 		(void)unlink(buf);
     73      1.1  cgd 
     74      1.1  cgd 	(void)sigprocmask(SIG_SETMASK, &oset, NULL);
     75      1.1  cgd 
     76      1.1  cgd 	if (fd == -1)
     77      1.1  cgd 		return (NULL);
     78      1.1  cgd 
     79      1.5  jtc 	if ((fp = fdopen(fd, "w+")) == NULL) {
     80      1.1  cgd 		sverrno = errno;
     81      1.1  cgd 		(void)close(fd);
     82      1.1  cgd 		errno = sverrno;
     83      1.1  cgd 		return (NULL);
     84      1.1  cgd 	}
     85      1.1  cgd 	return (fp);
     86      1.1  cgd }
     87