Test writing to a mmapped file around the 4GB offset.

3 files changed, 83 insertions, 2 deletions

diff --git a/regress/sys/uvm/Makefile b/regress/sys/uvm/Makefile
index 58d25f717fc..a8955c8f019 100644
--- a/regress/sys/uvm/Makefile
+++ b/regress/sys/uvm/Makefile
@@ -1,6 +1,6 @@
-#	$OpenBSD: Makefile,v 1.3 2005/01/06 10:14:20 otto Exp $
+#	$OpenBSD: Makefile,v 1.4 2005/05/03 18:26:54 otto Exp $
 
-SUBDIR=misc mmap_size
+SUBDIR=misc mmap_4g mmap_size
 
 install:
 
diff --git a/regress/sys/uvm/mmap_4g/Makefile b/regress/sys/uvm/mmap_4g/Makefile
new file mode 100644
index 00000000000..95f2d7705ae
--- /dev/null
+++ b/regress/sys/uvm/mmap_4g/Makefile
@@ -0,0 +1,4 @@
+#	$OpenBSD: Makefile,v 1.1 2005/05/03 18:26:54 otto Exp $
+PROG=mmap_4g
+
+.include <bsd.regress.mk>
diff --git a/regress/sys/uvm/mmap_4g/mmap_4g.c b/regress/sys/uvm/mmap_4g/mmap_4g.c
new file mode 100644
index 00000000000..d6dbb17ee96
--- /dev/null
+++ b/regress/sys/uvm/mmap_4g/mmap_4g.c
@@ -0,0 +1,77 @@
+/*	$OpenBSD: mmap_4g.c,v 1.1 2005/05/03 18:26:54 otto Exp $	*/
+
+/*
+ * Public domain. 2005, Otto Moerbeek <otto@drijf.net>
+ */
+
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <err.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <unistd.h>
+
+/*
+ * Write near the 4g boundary using a mmaped file and check if the
+ * bytes do not wrap to offset 0.
+ */
+
+int
+main()
+{
+	int fd, i;
+	off_t offset;
+	size_t sz;
+	char *p, buf[100];
+	const char * file = "foo";
+
+	fd = open(file, O_WRONLY | O_CREAT | O_TRUNC, 0666);
+	if (fd == -1)
+		err(1, "open");
+
+	sz = sizeof(buf);;
+	offset = 4LL * 1024LL * 1024LL * 1024LL - sz/2;
+
+	if (lseek(fd, offset, SEEK_SET) != offset)
+		err(1, "lseek");
+	memset(buf, 0, sz);
+	if (write(fd, buf, sz) != sz)
+		err(1, "write");
+	close(fd);
+
+	fd = open(file, O_RDWR, 0);
+	if (fd == -1)
+		err(1, "open");
+	p = mmap(NULL, 100, PROT_READ | PROT_WRITE, MAP_FILE | MAP_SHARED,
+	    fd, offset);
+	if (p == MAP_FAILED)
+		err(1, "mmap");
+	for (i = 0; i < sz; i++)
+		p[i] = i + 1;
+	if (munmap(p, sz) == -1)
+		err(1, "munmap");
+	close(fd);
+
+	fd = open(file, O_RDONLY, 0);
+	if (fd == -1)
+		err(1, "open");
+	if (read(fd, buf, sz) != sz)
+		err(1, "read");
+	for (i = 0; i < sz; i++)
+		if (buf[i])
+			errx(1, "nonzero byte 0x%02x found at offset %zu", 
+			    buf[i], i);
+
+	if (lseek(fd, offset, SEEK_SET) != offset)
+		err(1, "lseek");
+	if (read(fd, buf, sz) != sz)
+		err(1, "read");
+	for (i = 0; i < sz; i++)
+		if (buf[i] != i + 1)
+			err(1, "incorrect value 0x%02x at offset %llx",
+			    p[i], offset + i);
+
+	close(fd);
+	unlink(file);
+	return 0;
+}