sysdeps/unix/mkdir.c

   1 /* Copyright (C) 1992, 1994, 1995, 1996 Free Software Foundation, Inc.
   2 This file is part of the GNU C Library.
   3
   4 The GNU C Library is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 License, or (at your option) any later version.
   8
   9 The GNU C Library is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <errno.h>
  20 #include <stddef.h>
  21 #include <sys/stat.h>
  22 #include <sys/types.h>
  23 #include <stdlib.h>
  24 #include <sys/wait.h>
  25 #include <string.h>
  26
  27 /* Create a directory named PATH with protections MODE.  */
  28 int
  29 __mkdir (path, mode)
  30      const char *path;
  31      mode_t mode;
  32 {
  33   char *cmd = __alloca (80 + strlen (path));
  34   char *p;
  35   int status;
  36   mode_t mask;
  37   int save;
  38   struct stat statbuf;
  39
  40   if (path == NULL)
  41     {
  42       __set_errno (EINVAL);
  43       return -1;
  44     }
  45
  46   /* Check for some errors.  */
  47   if (__stat (path, &statbuf) < 0)
  48     {
  49       if (errno != ENOENT)
  50         return -1;
  51       /* There is no file by that name.  Good.  */
  52     }
  53   else
  54     {
  55       __set_errno (EEXIST);
  56       return -1;
  57     }
  58
  59   /* Race condition, but how else to do it?  */
  60   mask = __umask (0777);
  61   (void) __umask (mask);
  62
  63   p = cmd;
  64   *p++ = 'm';
  65   *p++ = 'k';
  66   *p++ = 'd';
  67   *p++ = 'i';
  68   *p++ = 'r';
  69   *p++ = ' ';
  70
  71   mode &= ~mask;
  72   *p++ = '-';
  73   *p++ = 'm';
  74   *p++ = ' ';
  75   *p++ = ((mode & 07000) >> 9) + '0';
  76   *p++ = ((mode & 0700) >> 6) + '0';
  77   *p++ = ((mode & 070) >> 3) + '0';
  78   *p++ = ((mode & 07)) + '0';
  79   *p++ = ' ';
  80
  81   strcpy (p, path);
  82
  83   save = errno;
  84   /* If system doesn't set errno, but the mkdir fails, we really
  85      have no idea what went wrong.  EIO is the vaguest error I
  86      can think of, so I'll use that.  */
  87   __set_errno (EIO);
  88   status = system (cmd);
  89   if (WIFEXITED (status) && WEXITSTATUS (status) == 0)
  90     {
  91       __set_errno (save);
  92       return 0;
  93     }
  94   else
  95     return -1;
  96 }
  97
  98 weak_alias (__mkdir, mkdir)