lib/libuutil/uu_open.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, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27
  28
  29 #include "libuutil_common.h"
  30
  31 #include <sys/time.h>
  32
  33 #include <errno.h>
  34 #include <fcntl.h>
  35 #include <limits.h>
  36 #include <stdio.h>
  37 #include <unistd.h>
  38
  39 #ifdef _LP64
  40 #define TMPPATHFMT      "%s/uu%ld"
  41 #else /* _LP64 */
  42 #define TMPPATHFMT      "%s/uu%lld"
  43 #endif /* _LP64 */
  44
  45 /*ARGSUSED*/
  46 int
  47 uu_open_tmp(const char *dir, uint_t uflags)
  48 {
  49         int f;
  50         char *fname = uu_zalloc(PATH_MAX);
  51
  52         if (fname == NULL)
  53                 return (-1);
  54
  55         for (;;) {
  56                 (void) snprintf(fname, PATH_MAX, "%s/uu%lld", dir, gethrtime());
  57
  58                 f = open(fname, O_CREAT | O_EXCL | O_RDWR, 0600);
  59
  60                 if (f >= 0 || errno != EEXIST)
  61                         break;
  62         }
  63
  64         if (f >= 0)
  65                 (void) unlink(fname);
  66
  67         uu_free(fname);
  68
  69         return (f);
  70 }