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* $Id: mktemp.c,v 1.3 2001/06/29 14:14:46 rufustfirefly Exp $
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* Copyright (c) 1987 Regents of the University of California.
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* Redistribution and use in source and binary forms are permitted
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* provided that: (1) source distributions retain this entire copyright
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* notice and comment, and (2) distributions including binaries display
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* the following acknowledgement: ``This product includes software
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* developed by the University of California, Berkeley and its contributors''
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* in the documentation or other materials provided with the distribution
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* and in all advertising materials mentioning features or use of this
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* software. Neither the name of the University nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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#endif /* HAVE_CONFIG_H */
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)mktemp.c 5.9 (Berkeley) 6/1/90";
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#endif /* LIBC_SCCS and not lint */
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static int _mktemp_dummy;
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#include <sys/types.h>
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return (_gettemp(path, &fd) ? fd : -1);
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return(_gettemp(path, (int *)NULL) ? path : (char *)NULL);
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_gettemp(path, doopen)
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register char *start, *trv;
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for (trv = path; *trv; ++trv); /* extra X's get set to 0's */
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while (*--trv == 'X') {
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*trv = (pid % 10) + '0';
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* check the target directory; if you have six X's and it
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* doesn't exist this runs for a *very* long time.
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for (start = trv + 1;; --trv) {
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if (stat(path, &sbuf))
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if (!S_ISDIR(sbuf.st_mode)) {
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open(path, O_CREAT|O_EXCL|O_RDWR, 0600)) >= 0)
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else if (stat(path, &sbuf))
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return(errno == ENOENT ? 1 : 0);
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/* tricky little algorithm for backward compatibility */
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for (trv = start;;) {