sysdeps/unix/sysv/mkdir.c

   1 /* Copyright (C) 1992, 1994, 1995 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 <ansidecl.h>
  20 #include <errno.h>
  21 #include <stddef.h>
  22 #include <sys/stat.h>
  23 #include <sys/types.h>
  24 #include <stdlib.h>
  25 #include <sys/wait.h>
  26 #include <string.h>
  27
  28 /* Create a directory named PATH with protections MODE.  */
  29 int
  30 DEFUN(__mkdir, (path, mode), CONST char *path AND mode_t mode)
  31 {
  32   char *cmd = __alloca (80 + strlen (path));
  33   char *p;
  34   int status;
  35   mode_t mask;
  36   int save;
  37   struct stat statbuf;
  38
  39   if (path == NULL)
  40     {
  41       errno = EINVAL;
  42       return -1;
  43     }
  44
  45   /* Check for some errors.  */
  46   if (__stat (path, &statbuf) < 0)
  47     {
  48       if (errno != ENOENT)
  49         return -1;
  50       /* There is no file by that name.  Good.  */
  51     }
  52   else
  53     {
  54       errno = EEXIST;
  55       return -1;
  56     }
  57
  58   /* Race condition, but how else to do it?  */
  59   mask = __umask (0777);
  60   (void) __umask (mask);
  61
  62   p = cmd;
  63   *p++ = 'm';
  64   *p++ = 'k';
  65   *p++ = 'd';
  66   *p++ = 'i';
  67   *p++ = 'r';
  68   *p++ = ' ';
  69
  70   mode &= ~mask;
  71   *p++ = '-';
  72   *p++ = 'm';
  73   *p++ = ' ';
  74   *p++ = ((mode & 07000) >> 9) + '0';
  75   *p++ = ((mode & 0700) >> 6) + '0';
  76   *p++ = ((mode & 070) >> 3) + '0';
  77   *p++ = ((mode & 07)) + '0';
  78   *p++ = ' ';
  79
  80   strcpy (p, path);
  81
  82   save = errno;
  83   /* If system doesn't set errno, but the mkdir fails, we really
  84      have no idea what went wrong.  EIO is the vaguest error I
  85      can think of, so I'll use that.  */
  86   errno = EIO;
  87   status = system (cmd);
  88   if (WIFEXITED (status) && WEXITSTATUS (status) == 0)
  89     {
  90       errno = save;
  91       return 0;
  92     }
  93   else
  94     return -1;
  95 }
  96
  97 weak_alias (__mkdir, mkdir)