merge from the autoconf2 branch to the main branch

(This used to be commit 3bda7ac417107a7b01d91805ca71c4330657ed21)

1 files changed, 66 insertions, 0 deletions

diff --git a/source3/tests/sysv_ipc.c b/source3/tests/sysv_ipc.c
new file mode 100644
index 0000000000..2374174e8f
--- /dev/null
+++ b/source3/tests/sysv_ipc.c
@@ -0,0 +1,66 @@
+/* this tests whether we can use a sysv shared memory segment
+   as needed for the sysv varient of FAST_SHARE_MODES */
+
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/ipc.h>
+#include <sys/shm.h>
+
+#define KEY 0x963796
+#define SIZE (32*1024)
+
+main()
+{
+	int id;
+	int *buf;
+	int count=7;
+
+#ifdef LINUX
+	if (sizeof(struct shmid_ds) == 52) {
+		printf("WARNING: You probably have a broken set of glibc2 include files - disabling sysv shared memory\n");
+		exit(1);
+	}
+#endif
+
+	id = shmget(KEY, 0, 0);
+	if (id != -1) {
+		if (shmctl(id, IPC_RMID, 0) != 0) exit(1);
+	}
+
+	if (fork() == 0) {
+		/* uggh - need locking */
+		sleep(2);
+
+		/* get an existing area */
+		id = shmget(KEY, 0, 0);
+		if (id == -1) exit(1);
+
+		buf = (int *)shmat(id, 0, 0);
+		if (buf == (int *)-1) exit(1);
+
+
+		while (count-- && buf[6124] != 55732) sleep(1);
+
+		if (count <= 0) exit(1);
+
+		buf[1763] = 7268;
+		exit(0);
+	}
+	
+	id = shmget(KEY, SIZE, IPC_CREAT | IPC_EXCL | 0600);
+	if (id == -1) exit(1);
+
+	buf = (int *)shmat(id, 0, 0);
+
+	if (buf == (int *)-1) exit(1);
+
+	buf[6124] = 55732;
+
+	while (count-- && buf[1763] != 7268) sleep(1);
+
+	shmctl(id, IPC_RMID, 0);
+
+	if (count <= 0) exit(1);
+	exit(0);
+}