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-rw-r--r--lib/replace/tests/shared_mremap.c51
1 files changed, 51 insertions, 0 deletions
diff --git a/lib/replace/tests/shared_mremap.c b/lib/replace/tests/shared_mremap.c
new file mode 100644
index 0000000..08040e2
--- /dev/null
+++ b/lib/replace/tests/shared_mremap.c
@@ -0,0 +1,51 @@
+/* this tests whether we can use mremap */
+
+#if defined(HAVE_UNISTD_H)
+#include <unistd.h>
+#endif
+#ifdef HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#define DATA "conftest.mmap"
+
+#ifndef MAP_FILE
+#define MAP_FILE 0
+#endif
+
+#ifndef MAP_FAILED
+#define MAP_FAILED (int *)-1
+#endif
+
+int main(void)
+{
+ int *buf;
+ int fd;
+ int err = 1;
+
+ fd = open(DATA, O_RDWR|O_CREAT|O_TRUNC, 0666);
+ if (fd == -1) {
+ exit(1);
+ }
+
+ buf = (int *)mmap(NULL, 0x1000, PROT_READ | PROT_WRITE,
+ MAP_FILE | MAP_SHARED, fd, 0);
+ if (buf == MAP_FAILED) {
+ goto done;
+ }
+
+ buf = mremap(buf, 0x1000, 0x2000, MREMAP_MAYMOVE);
+ if (buf == MAP_FAILED) {
+ goto done;
+ }
+
+ err = 0;
+done:
+ close(fd);
+ unlink(DATA);
+ exit(err);
+}