src/mkfifo.c

   1 /* mkfifo -- make fifo's (named pipes)
   2    Copyright (C) 1990, 1991 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 /* Options:
  19    -m, --mode=mode      Set the mode of created fifo's to MODE, which is
  20                         symbolic as in chmod and uses the umask as a point of
  21                         departure.
  22
  23    David MacKenzie <djm@ai.mit.edu>  */
  24
  25 #ifdef HAVE_CONFIG_H
  26 #if defined (CONFIG_BROKETS)
  27 /* We use <config.h> instead of "config.h" so that a compilation
  28    using -I. -I$srcdir will use ./config.h rather than $srcdir/config.h
  29    (which it would do because it found this file in $srcdir).  */
  30 #include <config.h>
  31 #else
  32 #include "config.h"
  33 #endif
  34 #endif
  35
  36 #include <stdio.h>
  37 #include <getopt.h>
  38 #include <sys/types.h>
  39 #include "system.h"
  40 #include "modechange.h"
  41 #include "version.h"
  42
  43 void error ();
  44
  45 static void usage ();
  46
  47 /* The name this program was run with. */
  48 char *program_name;
  49
  50 /* If non-zero, display usage information and exit.  */
  51 static int show_help;
  52
  53 /* If non-zero, print the version on standard output and exit.  */
  54 static int show_version;
  55
  56 static struct option const longopts[] =
  57 {
  58   {"mode", required_argument, NULL, 'm'},
  59   {"help", no_argument, &show_help, 1},
  60   {"version", no_argument, &show_version, 1},
  61   {NULL, 0, NULL, 0}
  62 };
  63
  64 void
  65 main (argc, argv)
  66      int argc;
  67      char **argv;
  68 {
  69   unsigned short newmode;
  70   struct mode_change *change;
  71   char *symbolic_mode;
  72   int errors = 0;
  73   int optc;
  74
  75   program_name = argv[0];
  76   symbolic_mode = NULL;
  77
  78 #ifndef S_ISFIFO
  79   error (4, 0, "fifo files not supported");
  80 #else
  81   while ((optc = getopt_long (argc, argv, "m:", longopts, (int *) 0)) != EOF)
  82     {
  83       switch (optc)
  84         {
  85         case 0:
  86           break;
  87         case 'm':
  88           symbolic_mode = optarg;
  89           break;
  90         default:
  91           usage ();
  92         }
  93     }
  94
  95   if (show_version)
  96     {
  97       printf ("%s\n", version_string);
  98       exit (0);
  99     }
 100
 101   if (show_help)
 102     usage ();
 103
 104   if (optind == argc)
 105     usage ();
 106
 107   newmode = 0666 & ~umask (0);
 108   if (symbolic_mode)
 109     {
 110       change = mode_compile (symbolic_mode, 0);
 111       if (change == MODE_INVALID)
 112         error (1, 0, "invalid mode");
 113       else if (change == MODE_MEMORY_EXHAUSTED)
 114         error (1, 0, "virtual memory exhausted");
 115       newmode = mode_adjust (newmode, change);
 116     }
 117
 118   for (; optind < argc; ++optind)
 119     {
 120       if (mkfifo (argv[optind], newmode))
 121         {
 122           error (0, errno, "cannot make fifo `%s'", argv[optind]);
 123           errors = 1;
 124         }
 125     }
 126
 127   exit (errors);
 128 #endif
 129 }
 130
 131 #ifdef S_ISFIFO
 132 static void
 133 usage ()
 134 {
 135   fprintf (stderr, "\
 136 Usage: %s [-m mode] [--mode=mode] [--help] [--version] path...\n",
 137            program_name);
 138   exit (1);
 139 }
 140 #endif