Better mmap() test
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
diff --git a/klibc/tests/mmaptest.c b/klibc/tests/mmaptest.c
index a654aff..9565c10 100644
--- a/klibc/tests/mmaptest.c
+++ b/klibc/tests/mmaptest.c
@@ -11,18 +11,64 @@
#include <stdint.h>
#include <sys/syscall.h>
+static void make_test_file(int fd)
+{
+ unsigned long v;
+ FILE *f = fdopen(fd, "wb");
+
+ for (v = 0; v < 262144; v += sizeof(v))
+ _fwrite(&v, sizeof(v), f);
+}
+
int main(int argc, char *argv[])
{
void *foo;
-
- (void)argc; (void)argv;
-
+ char *test_file = (argc > 1) ? argv[1] : "/tmp/mmaptest.tmp";
+ int rv, fd;
+ unsigned long q;
+
/* Important case, this is how we get memory for malloc() */
errno = 0;
- foo = mmap(0, 65536, PROT_READ|PROT_WRITE,
+ foo = mmap(NULL, 65536, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
-
+
printf("mmap() returned %p, errno = %d\n", foo, errno);
+ if (foo == MAP_FAILED)
+ return 1;
+
+ rv = munmap(foo, 65536);
+ printf("munmap() returned %d, errno = %d\n", rv, errno);
+ if (rv)
+ return 1;
+
+ /* Create test file */
+ fd = open(test_file, O_RDWR|O_CREAT|O_TRUNC, 0666);
+ if (fd < 0) {
+ perror(test_file);
+ return 1;
+ }
+
+ make_test_file(fd);
+
+ /* Map test file */
+ foo = mmap(NULL, 65536, PROT_READ, MAP_SHARED, fd, 131072);
+ printf("mmap() returned %p, errno = %d\n", foo, errno);
+ if (foo == MAP_FAILED)
+ return 1;
+
+ if (*(unsigned long *)foo != 131072) {
+ printf("mmap() with offset returned the wrong offset %ld!\n",
+ *(unsigned long *)foo);
+ return 1;
+ }
+
+ if (munmap(foo, 65536)) {
+ printf("munmap() returned nonzero, errno = %d\n", errno);
+ return 1;
+ }
+
+ close(fd);
+ unlink(test_file);
return 0;
}
