usr/src/lib/libc/port/gen/mkdtemp.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 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 /*
  30  * mkdtemp(3C) - create a directory with a unique name.
  31  */
  32
  33 #include "lint.h"
  34 #include <alloca.h>
  35 #include <errno.h>
  36 #include <stdlib.h>
  37 #include <string.h>
  38 #include <sys/stat.h>
  39
  40 char *
  41 mkdtemp(char *template)
  42 {
  43         char *t = alloca(strlen(template) + 1);
  44         char *r;
  45
  46         /* Save template */
  47         (void) strcpy(t, template);
  48         for (;;) {
  49                 r = mktemp(template);
  50
  51                 if (*r == '\0')
  52                         return (NULL);
  53
  54                 if (mkdir(template, 0700) == 0)
  55                         return (r);
  56
  57                 /* Other errors indicate persistent conditions. */
  58                 if (errno != EEXIST)
  59                         return (NULL);
  60
  61                 /* Reset template */
  62                 (void) strcpy(template, t);
  63         }
  64 }