usr/src/lib/libc/port/stdio/tmpnam_r.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*      Copyright (c) 1988 AT&T */
  28 /*        All Rights Reserved   */
  29
  30 #pragma ident   "%Z%%M% %I%     %E% SMI"
  31
  32 #include "lint.h"
  33 #include "mtlib.h"
  34 #include <sys/types.h>
  35 #include <stdio.h>
  36 #include <string.h>
  37 #include <stdlib.h>
  38 #include <errno.h>
  39 #include <thread.h>
  40 #include <synch.h>
  41 #include "tsd.h"
  42
  43 static char seed[] = { 'a', 'a', 'a', '\0' };
  44
  45 static mutex_t seed_lk = DEFAULTMUTEX;
  46
  47 char *
  48 tmpnam_r(char *s)
  49 {
  50         char *p = s, *q;
  51
  52         if (!s)
  53                 return (NULL);
  54
  55         (void) strcpy(p, P_tmpdir);
  56         lmutex_lock(&seed_lk);
  57         (void) strcat(p, seed);
  58         (void) strcat(p, "XXXXXX");
  59
  60         q = seed;
  61         while (*q == 'z')
  62                 *q++ = 'a';
  63         if (*q != '\0')
  64                 ++*q;
  65         lmutex_unlock(&seed_lk);
  66         (void) mktemp(p);
  67         return (p);
  68 }
  69
  70 char *
  71 tmpnam(char *s)
  72 {
  73         if (s == NULL)
  74                 s = tsdalloc(_T_TMPNAM, L_tmpnam, NULL);
  75         return (tmpnam_r(s));
  76 }