Add a simple regression test for the stat st_size bug just fixed in

sys_pipe.c

1 files changed, 82 insertions, 0 deletions

diff --git a/tools/regression/pipe/pipe-fstatbug.c b/tools/regression/pipe/pipe-fstatbug.c
new file mode 100644
index 0000000..ed038c2
--- /dev/null
+++ b/tools/regression/pipe/pipe-fstatbug.c
@@ -0,0 +1,82 @@
+/*
+Copyright (C) 2004 Michael J. Silbersack. All rights reserved.
+ 
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGE.
+*/
+
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/stat.h>
+
+/*
+ * $FreeBSD$
+ * The goal of this program is to see if fstat reports the correct
+ * data count for a pipe.  Prior to revision 1.172 of sys_pipe.c,
+ * 0 would be returned once the pipe entered direct write mode.
+ *
+ * Linux (2.6) always returns zero, so it's not a valuable platform
+ * for comparison.
+ */
+
+int main (void)
+{
+char buffer[32768], buffer2[32768];
+int desc[2];
+int error, successes;
+struct stat status;
+pid_t new_pid;
+
+error = pipe(desc);
+
+if (error)
+	err(0, "Couldn't allocate fds\n");
+
+new_pid = fork();
+
+if (new_pid == 0) {
+	write(desc[1], &buffer, 145);
+	usleep(1000000);
+	write(desc[1], &buffer, 2048);
+	usleep(1000000);
+	write(desc[1], &buffer, 4096);
+	usleep(1000000);
+	write(desc[1], &buffer, 8191);
+	usleep(1000000);
+	write(desc[1], &buffer, 8192);
+	usleep(1000000);
+} else {
+	while (successes < 5) {
+		usleep(3000);
+		fstat(desc[0], &status);
+		error = read(desc[0], &buffer2, 32768);
+		if (status.st_size != error)
+			err(0, "FAILURE: stat size %d read size %d\n", (int)status.st_size, error);
+		if (error > 0) {
+			printf("SUCCESS at stat size %d read size %d\n", (int)status.st_size, error);
+			successes++;
+			/* Sleep to avoid the natural race in reading st_size. */
+			usleep(1000000);
+		}
+	}
+}
+
+}