1 files changed, 59 insertions, 0 deletions
diff --git a/reference/C/CONTRIB/OR_USING_C/11.5.c b/reference/C/CONTRIB/OR_USING_C/11.5.c
new file mode 100644
index 0000000..50038de
--- /dev/null
+++ b/reference/C/CONTRIB/OR_USING_C/11.5.c
@@ -0,0 +1,59 @@
+#include <sys/types.h>
+#include <sys/ipc.h>
+#include <sys/shm.h>
+#include <stdio.h>
+
+#define SHMSZ     27
+
+main()
+{
+    char c;
+    int shmid;
+    key_t key;
+    char *shmat();
+    char *shm, *s;
+
+    /*
+     * We'll name our shared memory segment
+     * "5678".
+     */
+    key = 5678;
+
+    /*
+     * Create the segment.
+     */
+    if ((shmid = shmget(key, SHMSZ, IPC_CREAT | 0666)) < 0) {
+        perror("shmget");
+        exit(1);
+    }
+
+    /*
+     * Now we attach the segment to our data space.
+     */
+    if ((shm = shmat(shmid, NULL, 0)) == (char *) -1) {
+        perror("shmat");
+        exit(1);
+    }
+
+    /*
+     * Now put some things into the memory for the
+     * other process to read.
+     */
+    s = shm;
+
+    for (c = 'a'; c <= 'z'; c++)
+        *s++ = c;
+    *s = NULL;
+
+    /*
+     * Finally, we wait until the other process 
+     * changes the first character of our memory
+     * to '*', indicating that it has read what 
+     * we put there.
+     */
+    while (*shm != '*')
+        sleep(1);
+
+    exit(0);
+}
+