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-rw-r--r--tests/shared_mmap.c70
1 files changed, 70 insertions, 0 deletions
diff --git a/tests/shared_mmap.c b/tests/shared_mmap.c
new file mode 100644
index 0000000000..40d462302e
--- /dev/null
+++ b/tests/shared_mmap.c
@@ -0,0 +1,70 @@
+/* this tests whether we can use a shared writeable mmap on a file -
+ as needed for the mmap variant of FAST_SHARE_MODES */
+
+#if defined(HAVE_UNISTD_H)
+#include <unistd.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
+
+main()
+{
+ int *buf;
+ int i;
+ int fd = open(DATA,O_RDWR|O_CREAT|O_TRUNC,0666);
+ int count=7;
+
+ if (fd == -1) exit(1);
+
+ for (i=0;i<10000;i++) {
+ write(fd,&i,sizeof(i));
+ }
+
+ close(fd);
+
+ if (fork() == 0) {
+ fd = open(DATA,O_RDWR);
+ if (fd == -1) exit(1);
+
+ buf = (int *)mmap(NULL, 10000*sizeof(int),
+ (PROT_READ | PROT_WRITE),
+ MAP_FILE | MAP_SHARED,
+ fd, 0);
+
+ if (buf == (int *)-1) exit(1);
+
+ while (count-- && buf[9124] != 55732) sleep(1);
+
+ if (count <= 0) exit(1);
+
+ buf[1763] = 7268;
+ exit(0);
+ }
+
+ fd = open(DATA,O_RDWR);
+ if (fd == -1) exit(1);
+
+ buf = (int *)mmap(NULL, 10000*sizeof(int),
+ (PROT_READ | PROT_WRITE),
+ MAP_FILE | MAP_SHARED,
+ fd, 0);
+
+ if (buf == (int *)-1) exit(1);
+
+ buf[9124] = 55732;
+
+ while (count-- && buf[1763] != 7268) sleep(1);
+
+ unlink(DATA);
+
+ if (count > 0) exit(0);
+ exit(1);
+}