lib/mkdir.c

   1 /* mkrmdir.c -- BSD compatible directory functions for System V
   2    Copyright (C) 1988, 1990 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program 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
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software
  16    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  17
  18 #include <sys/types.h>
  19 #include <sys/stat.h>
  20 #include <errno.h>
  21 #ifndef STDC_HEADERS
  22 extern int errno;
  23 #endif
  24
  25 /* mkdir and rmdir adapted from GNU tar.  */
  26
  27 /* Make directory DPATH, with permission mode DMODE.
  28
  29    Written by Robert Rother, Mariah Corporation, August 1985
  30    (sdcsvax!rmr or rmr@uscd).  If you want it, it's yours.
  31
  32    Severely hacked over by John Gilmore to make a 4.2BSD compatible
  33    subroutine.  11Mar86; hoptoad!gnu
  34
  35    Modified by rmtodd@uokmax 6-28-87 -- when making an already existing dir,
  36    subroutine didn't return EEXIST.  It does now.  */
  37
  38 int
  39 mkdir (dpath, dmode)
  40      char *dpath;
  41      int dmode;
  42 {
  43   int cpid, status;
  44   struct stat statbuf;
  45
  46   if (stat (dpath, &statbuf) == 0)
  47     {
  48       errno = EEXIST;           /* stat worked, so it already exists.  */
  49       return -1;
  50     }
  51
  52   /* If stat fails for a reason other than non-existence, return error.  */
  53   if (errno != ENOENT)
  54     return -1;
  55
  56   cpid = fork ();
  57   switch (cpid)
  58     {
  59     case -1:                    /* Cannot fork.  */
  60       return -1;                /* errno is set already.  */
  61
  62     case 0:                     /* Child process.  */
  63       /* Cheap hack to set mode of new directory.  Since this child
  64          process is going away anyway, we zap its umask.
  65          This won't suffice to set SUID, SGID, etc. on this
  66          directory, so the parent process calls chmod afterward.  */
  67       status = umask (0);       /* Get current umask.  */
  68       umask (status | (0777 & ~dmode)); /* Set for mkdir.  */
  69       execl ("/bin/mkdir", "mkdir", dpath, (char *) 0);
  70       _exit (1);
  71
  72     default:                    /* Parent process.  */
  73       while (wait (&status) != cpid) /* Wait for kid to finish.  */
  74         /* Do nothing.  */ ;
  75
  76       if (status & 0xFFFF)
  77         {
  78           errno = EIO;          /* /bin/mkdir failed.  */
  79           return -1;
  80         }
  81       return chmod (dpath, dmode);
  82     }
  83 }
  84
  85 /* Remove directory DPATH.
  86    Return 0 if successful, -1 if not.  */
  87
  88 int
  89 rmdir (dpath)
  90      char *dpath;
  91 {
  92   int cpid, status;
  93   struct stat statbuf;
  94
  95   if (stat (dpath, &statbuf) != 0)
  96     return -1;                  /* stat set errno.  */
  97
  98   if ((statbuf.st_mode & S_IFMT) != S_IFDIR)
  99     {
 100       errno = ENOTDIR;
 101       return -1;
 102     }
 103
 104   cpid = fork ();
 105   switch (cpid)
 106     {
 107     case -1:                    /* Cannot fork.  */
 108       return -1;                /* errno is set already.  */
 109
 110     case 0:                     /* Child process.  */
 111       execl ("/bin/rmdir", "rmdir", dpath, (char *) 0);
 112       _exit (1);
 113
 114     default:                    /* Parent process.  */
 115       while (wait (&status) != cpid) /* Wait for kid to finish.  */
 116         /* Do nothing.  */ ;
 117
 118       if (status & 0xFFFF)
 119         {
 120           errno = EIO;          /* /bin/rmdir failed.  */
 121           return -1;
 122         }
 123       return 0;
 124     }
 125 }