Line data    Source code

       1             : /* psize.c - Find pipe size. */
       2             : 
       3             : /* Copyright (C) 1987, 1991 Free Software Foundation, Inc.
       4             : 
       5             :    This file is part of GNU Bash, the Bourne Again SHell.
       6             : 
       7             :    Bash is free software: you can redistribute it and/or modify
       8             :    it under the terms of the GNU General Public License as published by
       9             :    the Free Software Foundation, either version 3 of the License, or
      10             :    (at your option) any later version.
      11             : 
      12             :    Bash is distributed in the hope that it will be useful,
      13             :    but WITHOUT ANY WARRANTY; without even the implied warranty of
      14             :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      15             :    GNU General Public License for more details.
      16             : 
      17             :    You should have received a copy of the GNU General Public License
      18             :    along with Bash.  If not, see <http://www.gnu.org/licenses/>.
      19             : */
      20             : 
      21             : /*  Write output in 128-byte chunks until we get a sigpipe or write gets an
      22             :     EPIPE.  Then report how many bytes we wrote.  We assume that this is the
      23             :     pipe size. */
      24             : #include <config.h>
      25             : 
      26             : #if defined (HAVE_UNISTD_H)
      27             : #  ifdef _MINIX
      28             : #    include <sys/types.h>
      29             : #  endif
      30             : #  include <unistd.h>
      31             : #endif
      32             : 
      33             : #include <stdio.h>
      34             : #ifndef _MINIX
      35             : #include "../bashtypes.h"
      36             : #endif
      37             : #include <signal.h>
      38             : #include <errno.h>
      39             : 
      40             : #include "../command.h"
      41             : #include "../general.h"
      42             : #include "../sig.h"
      43             : 
      44             : #ifndef errno
      45             : extern int errno;
      46             : #endif
      47             : 
      48             : int nw;
      49             : 
      50             : sighandler
      51           1 : sigpipe (sig)
      52             :      int sig;
      53             : {
      54           1 :   fprintf (stderr, "%d\n", nw);
      55           1 :   exit (0);
      56             : }
      57             : 
      58             : int
      59           1 : main (argc, argv)
      60             :      int argc;
      61             :      char **argv;
      62             : {
      63           1 :   char buf[128];
      64           1 :   register int i;
      65             : 
      66         129 :   for (i = 0; i < 128; i++)
      67         128 :     buf[i] = ' ';
      68             : 
      69           1 :   signal (SIGPIPE, sigpipe);
      70             : 
      71           1 :   nw = 0;
      72        1025 :   for (;;)
      73             :     {
      74         513 :       int n;
      75         513 :       n = write (1, buf, 128);
      76         512 :       nw += n;
      77             :     }
      78             :   return (0);
      79             : }