diff --git a/src/shm.h b/src/shm.h
new file mode 100644
index 0000000..332c5f1
--- /dev/null
+++ b/src/shm.h
@@ -0,0 +1,30 @@
+#ifndef _SHM_H
+#define _SHM_H
+// SHM support
+typedef enum {
+  SMS_EMPTY=0,
+  SMS_ROOT,
+  SMS_C,
+  SMS_R,
+  SMS_DS,
+  SMS_DS_DATA,
+  SMS_FS,
+  SMS_FS_DATA,
+  SMS_M,
+  SMS_M_DATA,
+  SMS_SIG
+} shm_section_t;
+
+typedef struct {
+  int          type;    // shm_section_t
+  int          addr;
+  int          size;
+} shm_header_entry_t;
+ 
+#define SHM_MAX_SECTIONS  256
+
+int   allocate_shm(char *key, int bufsize, void **buf);
+int   open_shm(char *key, int *bufsize, void **buf);
+void  close_shm(int fd);
+void *allocate_section(void *buf,shm_section_t type,int size); 
+#endif