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tmp.c revision 1.1.1.1 
      1 /*-
      2  * Copyright (c) 1993
      3  *	The Regents of the University of California.  All rights reserved.
      4  *
      5  * This code is derived from software contributed to Berkeley by
      6  * Peter McIlroy.
      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 #ifndef lint
     38 static char sccsid[] = "@(#)tmp.c	8.1 (Berkeley) 6/6/93";
     39 #endif /* not lint */
     40 
     41 #include <sys/param.h>
     42 
     43 #include <err.h>
     44 #include <errno.h>
     45 #include <limits.h>
     46 #include <signal.h>
     47 #include <stdio.h>
     48 #include <stdlib.h>
     49 #include <string.h>
     50 #include <unistd.h>
     51 
     52 #include "pathnames.h"
     53 
     54 #define _NAME_TMP "sort.XXXXXXXX"
     55 
     56 FILE *
     57 ftmp()
     58 {
     59 	static char *envtmp;
     60 	sigset_t set, oset;
     61 	static int first = 0;
     62 	FILE *fd;
     63 	char pathb[_POSIX_PATH_MAX], *path;
     64 
     65 	path = pathb;
     66 	if (!first && !envtmp) {
     67 		envtmp = getenv("TMPDIR");
     68 		first = 1;
     69 	}
     70 	if (envtmp)
     71 		(void)snprintf(path,
     72 		    sizeof(pathb), "%s/%s", envtmp, _NAME_TMP);
     73 	else {
     74 		memmove(path, _PATH_SORTTMP, sizeof(_PATH_SORTTMP));
     75 	}
     76 	sigfillset(&set);
     77 	(void)sigprocmask(SIG_BLOCK, &set, &oset);
     78 	path = mktemp(path);
     79 	if (!path)
     80 		err(2, "%s");
     81 	if (!(fd = fopen(path, "w+")))
     82 		err(2, "%s", path);
     83 	(void)unlink(path);
     84 
     85 	(void)sigprocmask(SIG_SETMASK, &oset, NULL);
     86 	return (fd);
     87 };
     88