xref: /csrg-svn/lib/libc/stdio/tmpfile.c (revision 46559)
146111Sbostic /*-
246111Sbostic  * Copyright (c) 1990 The Regents of the University of California.
346111Sbostic  * All rights reserved.
446111Sbostic  *
546111Sbostic  * This code is derived from software contributed to Berkeley by
646111Sbostic  * Chris Torek.
746111Sbostic  *
846111Sbostic  * %sccs.include.redist.c%
946111Sbostic  */
1046111Sbostic 
1146111Sbostic #if defined(LIBC_SCCS) && !defined(lint)
12*46559Sbostic static char sccsid[] = "@(#)tmpfile.c	5.2 (Berkeley) 02/22/91";
1346111Sbostic #endif /* LIBC_SCCS and not lint */
1446111Sbostic 
15*46559Sbostic #include <sys/types.h>
16*46559Sbostic #include <signal.h>
17*46559Sbostic #include <errno.h>
1846111Sbostic #include <stdio.h>
19*46559Sbostic #include <paths.h>
2046111Sbostic 
2146111Sbostic FILE *
2246111Sbostic tmpfile()
2346111Sbostic {
24*46559Sbostic 	sigset_t set, oset;
2546111Sbostic 	FILE *fp;
26*46559Sbostic 	int fd, sverrno;
27*46559Sbostic #define	TRAILER	"tmp.XXXXXX"
28*46559Sbostic 	char buf[sizeof(_PATH_TMP) + sizeof(TRAILER)];
2946111Sbostic 
30*46559Sbostic 	bcopy(_PATH_TMP, buf, sizeof(_PATH_TMP) - 1);
31*46559Sbostic 	bcopy(TRAILER, buf + sizeof(_PATH_TMP) - 1, sizeof(TRAILER));
32*46559Sbostic 
33*46559Sbostic 	sigemptyset(&set);
34*46559Sbostic 	sigaddset(&set, SIGHUP);
35*46559Sbostic 	sigaddset(&set, SIGINT);
36*46559Sbostic 	sigaddset(&set, SIGQUIT);
37*46559Sbostic 	sigaddset(&set, SIGTERM);
38*46559Sbostic 	(void)sigprocmask(SIG_BLOCK, &set, &oset);
39*46559Sbostic 
40*46559Sbostic 	fd = mkstemp(buf);
41*46559Sbostic 	if (fd != -1)
42*46559Sbostic 		(void)unlink(buf);
43*46559Sbostic 
44*46559Sbostic 	(void)sigprocmask(SIG_SETMASK, &oset, (sigset_t *)NULL);
45*46559Sbostic 
46*46559Sbostic 	if (fd == -1)
47*46559Sbostic 		return(NULL);
48*46559Sbostic 
49*46559Sbostic 	if (!(fp = fdopen(fd, "w+"))) {
50*46559Sbostic 		sverrno = errno;
51*46559Sbostic 		(void)close(fd);
52*46559Sbostic 		errno = sverrno;
53*46559Sbostic 		return(NULL);
54*46559Sbostic 	}
55*46559Sbostic 	return(fp);
5646111Sbostic }
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