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tmpfile.c revision 1.4 
      1 /*-
      2  * Copyright (c) 1990 The Regents of the University of California.
      3  * All rights reserved.
      4  *
      5  * This code is derived from software contributed to Berkeley by
      6  * Chris Torek.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  * 3. All advertising materials mentioning features or use of this software
     17  *    must display the following acknowledgement:
     18  *	This product includes software developed by the University of
     19  *	California, Berkeley and its contributors.
     20  * 4. Neither the name of the University nor the names of its contributors
     21  *    may be used to endorse or promote products derived from this software
     22  *    without specific prior written permission.
     23  *
     24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  * SUCH DAMAGE.
     35  */
     36 
     37 #if defined(LIBC_SCCS) && !defined(lint)
     38 /*static char *sccsid = "from: @(#)tmpfile.c	5.4 (Berkeley) 5/27/91";*/
     39 static char *rcsid = "$Id: tmpfile.c,v 1.4 1993/12/28 19:45:46 jtc Exp $";
     40 #endif /* LIBC_SCCS and not lint */
     41 
     42 #include <sys/types.h>
     43 #include <unistd.h>
     44 #include <signal.h>
     45 #include <errno.h>
     46 #include <stdio.h>
     47 #include <string.h>
     48 #include <paths.h>
     49 
     50 FILE *
     51 tmpfile()
     52 {
     53 	sigset_t set, oset;
     54 	FILE *fp;
     55 	int fd, sverrno;
     56 #define	TRAILER	"tmp.XXXXXX"
     57 	char buf[sizeof(_PATH_TMP) + sizeof(TRAILER)];
     58 
     59 	bcopy(_PATH_TMP, buf, sizeof(_PATH_TMP) - 1);
     60 	bcopy(TRAILER, buf + sizeof(_PATH_TMP) - 1, sizeof(TRAILER));
     61 
     62 	sigfillset(&set);
     63 	(void)sigprocmask(SIG_BLOCK, &set, &oset);
     64 
     65 	fd = mkstemp(buf);
     66 	if (fd != -1)
     67 		(void)unlink(buf);
     68 
     69 	(void)sigprocmask(SIG_SETMASK, &oset, NULL);
     70 
     71 	if (fd == -1)
     72 		return (NULL);
     73 
     74 	if (!(fp = fdopen(fd, "w+"))) {
     75 		sverrno = errno;
     76 		(void)close(fd);
     77 		errno = sverrno;
     78 		return (NULL);
     79 	}
     80 	return (fp);
     81 }
     82