src/mkfifo.c

   1 /* mkfifo -- make fifo's (named pipes)
   2    Copyright (C) 90, 91, 1995-2004 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 Foundation,
  16    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  17
  18 /* David MacKenzie <djm@ai.mit.edu>  */
  19
  20 #include <config.h>
  21 #include <stdio.h>
  22 #include <getopt.h>
  23 #include <sys/types.h>
  24
  25 #include "system.h"
  26 #include "error.h"
  27 #include "modechange.h"
  28 #include "quote.h"
  29
  30 /* The official name of this program (e.g., no `g' prefix).  */
  31 #define PROGRAM_NAME "mkfifo"
  32
  33 #define AUTHORS "David MacKenzie"
  34
  35 /* The name this program was run with. */
  36 char *program_name;
  37
  38 static struct option const longopts[] =
  39 {
  40   {"mode", required_argument, NULL, 'm'},
  41   {GETOPT_HELP_OPTION_DECL},
  42   {GETOPT_VERSION_OPTION_DECL},
  43   {NULL, 0, NULL, 0}
  44 };
  45
  46 #ifdef S_ISFIFO
  47 void
  48 usage (int status)
  49 {
  50   if (status != EXIT_SUCCESS)
  51     fprintf (stderr, _("Try `%s --help' for more information.\n"),
  52              program_name);
  53   else
  54     {
  55       printf (_("Usage: %s [OPTION] NAME...\n"), program_name);
  56       fputs (_("\
  57 Create named pipes (FIFOs) with the given NAMEs.\n\
  58 \n\
  59 "), stdout);
  60       fputs (_("\
  61 Mandatory arguments to long options are mandatory for short options too.\n\
  62 "), stdout);
  63       fputs (_("\
  64   -m, --mode=MODE   set permission mode (as in chmod), not a=rw - umask\n\
  65 "), stdout);
  66       fputs (HELP_OPTION_DESCRIPTION, stdout);
  67       fputs (VERSION_OPTION_DESCRIPTION, stdout);
  68       printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
  69     }
  70   exit (status);
  71 }
  72 #endif
  73
  74 int
  75 main (int argc, char **argv)
  76 {
  77   mode_t newmode;
  78   struct mode_change *change;
  79   const char *specified_mode;
  80   int errors = 0;
  81   int optc;
  82
  83   initialize_main (&argc, &argv);
  84   program_name = argv[0];
  85   setlocale (LC_ALL, "");
  86   bindtextdomain (PACKAGE, LOCALEDIR);
  87   textdomain (PACKAGE);
  88
  89   atexit (close_stdout);
  90
  91   specified_mode = NULL;
  92
  93 #ifndef S_ISFIFO
  94   error (EXIT_FAILURE, 0, _("fifo files not supported"));
  95 #else
  96   while ((optc = getopt_long (argc, argv, "m:", longopts, NULL)) != -1)
  97     {
  98       switch (optc)
  99         {
 100         case 0:
 101           break;
 102         case 'm':
 103           specified_mode = optarg;
 104           break;
 105         case_GETOPT_HELP_CHAR;
 106         case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
 107         default:
 108           usage (EXIT_FAILURE);
 109         }
 110     }
 111
 112   if (optind == argc)
 113     {
 114       error (0, 0, _("too few arguments"));
 115       usage (EXIT_FAILURE);
 116     }
 117
 118   newmode = (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
 119   if (specified_mode)
 120     {
 121       newmode &= ~ umask (0);
 122       change = mode_compile (specified_mode, 0);
 123       if (change == MODE_INVALID)
 124         error (EXIT_FAILURE, 0, _("invalid mode"));
 125       else if (change == MODE_MEMORY_EXHAUSTED)
 126         xalloc_die ();
 127       newmode = mode_adjust (newmode, change);
 128     }
 129
 130   for (; optind < argc; ++optind)
 131     {
 132       int fail = mkfifo (argv[optind], newmode);
 133       if (fail)
 134         error (0, errno, _("cannot create fifo %s"), quote (argv[optind]));
 135
 136       /* If the containing directory happens to have a default ACL, chmod
 137          ensures the file mode permission bits are still set as desired.  */
 138
 139       if (fail == 0 && specified_mode)
 140         {
 141           fail = chmod (argv[optind], newmode);
 142           if (fail)
 143             error (0, errno, _("cannot set permissions of fifo %s"),
 144                    quote (argv[optind]));
 145         }
 146
 147       if (fail)
 148         errors = 1;
 149     }
 150
 151   exit (errors);
 152 #endif
 153 }