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tmp.c revision 1.2 
      1 /*	$NetBSD: tmp.c,v 1.2 2000/10/07 18:37:10 bjh21 Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 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  * Peter McIlroy.
      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. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the University of
     21  *	California, Berkeley and its contributors.
     22  * 4. Neither the name of the University nor the names of its contributors
     23  *    may be used to endorse or promote products derived from this software
     24  *    without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36  * SUCH DAMAGE.
     37  */
     38 
     39 #include "sort.h"
     40 
     41 #ifndef lint
     42 __RCSID("$NetBSD: tmp.c,v 1.2 2000/10/07 18:37:10 bjh21 Exp $");
     43 __SCCSID("@(#)tmp.c	8.1 (Berkeley) 6/6/93");
     44 #endif /* not lint */
     45 
     46 #include <sys/param.h>
     47 
     48 #include <err.h>
     49 #include <errno.h>
     50 #include <limits.h>
     51 #include <signal.h>
     52 #include <stdio.h>
     53 #include <stdlib.h>
     54 #include <string.h>
     55 #include <unistd.h>
     56 
     57 #include "pathnames.h"
     58 
     59 #define _NAME_TMP "sort.XXXXXXXX"
     60 
     61 FILE *
     62 ftmp()
     63 {
     64 	static char *envtmp;
     65 	sigset_t set, oset;
     66 	static int first = 0;
     67 	FILE *fd;
     68 	char pathb[_POSIX_PATH_MAX], *path;
     69 
     70 	path = pathb;
     71 	if (!first && !envtmp) {
     72 		envtmp = getenv("TMPDIR");
     73 		first = 1;
     74 	}
     75 	if (envtmp)
     76 		(void)snprintf(path,
     77 		    sizeof(pathb), "%s/%s", envtmp, _NAME_TMP);
     78 	else {
     79 		memmove(path, _PATH_SORTTMP, sizeof(_PATH_SORTTMP));
     80 	}
     81 	sigfillset(&set);
     82 	(void)sigprocmask(SIG_BLOCK, &set, &oset);
     83 	path = mktemp(path);
     84 	if (!path)
     85 		err(2, NULL);
     86 	if (!(fd = fopen(path, "w+")))
     87 		err(2, "%s", path);
     88 	(void)unlink(path);
     89 
     90 	(void)sigprocmask(SIG_SETMASK, &oset, NULL);
     91 	return (fd);
     92 };
     93