e_ipc: fix creation of IPC server when $DISPLAY is a path

Summary:
Some implementations of the X server (e.g. Xquartz) define their $DISPLAY
as a path. Since ecore_ipc_server_add() does not create non-existant
directories, and since it may not worth to hide the socket in a complex
path, this patch aims at reducing the $DISPLAY by only keeping its basename.

Reviewers: zmike

Subscribers: cedric

Differential Revision: https://phab.enlightenment.org/D2465

src/bin/e_ipc.c

@@ -16,7 +16,7 @@ e_ipc_init(void)
 {
 #ifdef USE_IPC
    char buf[4096], buf2[128], buf3[4096];
-   char *tmp, *user, *disp, *base;
+   char *tmp, *user, *disp, *disp2, *base;
    int pid, trynum = 0, id1 = 0;
    struct stat st;
 
@@ -71,7 +71,13 @@ e_ipc_init(void)
    
    disp = getenv("DISPLAY");
    if (!disp) disp = ":0";
-   
+   else
+     {
+        /* $DISPLAY may be a path (e.g. Xquartz), keep the basename. */
+        disp2 = strrchr(disp, '/');
+        if (disp2) disp = disp2 + 1;
+     }
+
    e_util_env_set("E_IPC_SOCKET", "");
    
    pid = (int)getpid();