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mkfifo.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1992-2010 AT&T Intellectual Property          *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                    by AT&T Intellectual Property                     *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                  David Korn <dgk@research.att.com>                   *
*                                                                      *
***********************************************************************/
#pragma prototyped
/*
 * David Korn
 * AT&T Bell Laboratories
 *
 * mkfifo
 */

static const char usage[] =
"[-?\n@(#)$Id: mkfifo (AT&T Research) 2009-01-02 $\n]"
USAGE_LICENSE
"[+NAME?mkfifo - make FIFOs (named pipes)]"
"[+DESCRIPTION?\bmkfifo\b creates one or more FIFO's.  By "
      "default, the mode of created FIFO is \ba=rw\b minus the "
      "bits set in the \bumask\b(1).]"
"[m:mode]:[mode?Set the mode of created FIFO to \amode\a.  "
      "\amode\a is symbolic or octal mode as in \bchmod\b(1).  Relative "
      "modes assume an initial mode of \ba=rw\b.]"
"\n"
"\nfile ...\n"
"\n"
"[+EXIT STATUS?]{"
        "[+0?All FIFO's created successfully.]"
        "[+>0?One or more FIFO's could not be created.]"
"}"
"[+SEE ALSO?\bchmod\b(1), \bumask\b(1)]"
;

#include <cmd.h>
#include <ls.h>

int
b_mkfifo(int argc, char *argv[], void* context)
{
      register char*    arg;
      register mode_t mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH;
      register mode_t   mask = 0;
      register int      mflag = 0;

      cmdinit(argc, argv, context, ERROR_CATALOG, 0);
      for (;;)
      {
            switch (optget(argv, usage))
            {
            case 'm':
                  mflag = 1;
                  mode = strperm(arg = opt_info.arg, &opt_info.arg, mode);
                  if (*opt_info.arg)
                        error(ERROR_exit(0), "%s: invalid mode", arg);
                  continue;
            case ':':
                  error(2, "%s", opt_info.arg);
                  break;
            case '?':
                  error(ERROR_usage(2), "%s", opt_info.arg);
                  break;
            }
            break;
      }
      argv += opt_info.index;
      if (error_info.errors || !*argv)
            error(ERROR_usage(2), "%s", optusage(NiL));
      mask = umask(0);
      if (!mflag)
      {
            mode &= ~mask;
            umask(mask);
            mask = 0;
      }
      while (arg = *argv++)
            if (mkfifo(arg, mode) < 0)
                  error(ERROR_system(0), "%s:", arg);
      if (mask)
            umask(mask);
      return error_info.errors != 0;
}

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