summaryrefslogtreecommitdiffstats
path: root/builtins/psize.c
diff options
context:
space:
mode:
Diffstat (limited to 'builtins/psize.c')
-rw-r--r--builtins/psize.c79
1 files changed, 79 insertions, 0 deletions
diff --git a/builtins/psize.c b/builtins/psize.c
new file mode 100644
index 0000000..30881fb
--- /dev/null
+++ b/builtins/psize.c
@@ -0,0 +1,79 @@
+/* psize.c - Find pipe size. */
+
+/* Copyright (C) 1987, 1991 Free Software Foundation, Inc.
+
+ This file is part of GNU Bash, the Bourne Again SHell.
+
+ Bash is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ Bash is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with Bash. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/* Write output in 128-byte chunks until we get a sigpipe or write gets an
+ EPIPE. Then report how many bytes we wrote. We assume that this is the
+ pipe size. */
+#include <config.h>
+
+#if defined (HAVE_UNISTD_H)
+# ifdef _MINIX
+# include <sys/types.h>
+# endif
+# include <unistd.h>
+#endif
+
+#include <stdio.h>
+#ifndef _MINIX
+#include "../bashtypes.h"
+#endif
+#include <signal.h>
+#include <errno.h>
+
+#include "../command.h"
+#include "../general.h"
+#include "../sig.h"
+
+#ifndef errno
+extern int errno;
+#endif
+
+int nw;
+
+sighandler
+sigpipe (sig)
+ int sig;
+{
+ fprintf (stderr, "%d\n", nw);
+ exit (0);
+}
+
+int
+main (argc, argv)
+ int argc;
+ char **argv;
+{
+ char buf[128];
+ register int i;
+
+ for (i = 0; i < 128; i++)
+ buf[i] = ' ';
+
+ signal (SIGPIPE, sigpipe);
+
+ nw = 0;
+ for (;;)
+ {
+ int n;
+ n = write (1, buf, 128);
+ nw += n;
+ }
+ return (0);
+}