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 it 8 under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 2, or (at your option) 10 any later version. 11 12 Bash is distributed in the hope that it will be useful, but WITHOUT 13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 14 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public 15 License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with Bash; see the file COPYING. If not, write to the Free 19 Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */ 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 45extern int errno; 46#endif 47 48int nw; 49 50sighandler 51sigpipe (sig) 52 int sig; 53{ 54 fprintf (stderr, "%d\n", nw); 55 exit (0); 56} 57 58int 59main (argc, argv) 60 int argc; 61 char **argv; 62{ 63 char buf[128]; 64 register int i; 65 66 for (i = 0; i < 128; i++) 67 buf[i] = ' '; 68 69 signal (SIGPIPE, sigpipe); 70 71 nw = 0; 72 for (;;) 73 { 74 int n; 75 n = write (1, buf, 128); 76 nw += n; 77 } 78 return (0); 79} 80