add separate path for reading key from SHM

1 files changed, 23 insertions, 0 deletions

diff --git a/readkey.c b/readkey.c
new file mode 100644
index 0000000..a7337b6
--- /dev/null
+++ b/readkey.c
@@ -0,0 +1,23 @@
+#define _XOPEN_SOURCE 700
+#include <fcntl.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/shm.h>
+#include "deonebook.h"
+
+unsigned char *readkey(const char *path)
+{
+	key_t key = ftok(path, 0x2a);
+	if (key == (key_t)(-1)) {
+		perror("ftok");
+		return NULL;
+	}
+
+	int shmid = shmget(key, 0, 0);
+	if (shmid == -1) {
+		perror("shmget");
+		return NULL;
+	}
+
+	return shmat(shmid, NULL, 0);
+}