consult env var to find socket path

luac.c

@@ -103,6 +103,11 @@ int main(int argc, char **argv)
         exit(1);
     }
 
+    char * socket_path = getenv("LUAD_SOCKET_PATH");
+    if(! socket_path) {
+        error(1, 0, "Missing required environment variable LUAD_SOCKET_PATH");
+    }
+
     char * iobuf = (char *) calloc(1024, sizeof(char));
     if(!iobuf) return 1;
     int iobuf_len = encode_args(iobuf, 1024, argc, argv);
@@ -118,7 +123,8 @@ int main(int argc, char **argv)
     memcpy(my_addr.sun_path + 1, (void *) &mypid, sizeof mypid);
     memcpy(my_addr.sun_path + 1 + sizeof mypid, iobuf, maxnamelen - sizeof mypid - 1);
 
-    struct sockaddr_un peer_addr = { AF_UNIX, "/tmp/mysock" };
+    struct sockaddr_un peer_addr = { AF_UNIX };
+    strlcpy(peer_addr.sun_path, socket_path, sizeof peer_addr.sun_path);
     int socket = open_socket(&my_addr, &peer_addr);
 
     struct cmsghdr *cmsg;

luad.c

@@ -147,6 +147,11 @@ int main(int argc, char **argv)
     struct peer_entry * peer_table = calloc(501, sizeof (struct peer_entry));
     peer_table[500].pid = -1;
 
+    char * socket_path = getenv("LUAD_SOCKET_PATH");
+    if(! socket_path) {
+        error(1, 0, "Missing required environment variable LUAD_SOCKET_PATH");
+    }
+
     if(pipe(sigpipe_fds) < 0) {
         die("can't create pipe");
     }
@@ -161,7 +166,7 @@ int main(int argc, char **argv)
         }
     }
 
-    int socket = open_socket("/tmp/mysock"); /* FIXME hardcoded */
+    int socket = open_socket(socket_path);
     struct sockaddr_un peer_addr;
     socklen_t peer_addr_len;
     char buf[1025];