dwm/dwm-r1615-selfrestart.diff

# HG changeset patch
# User Barbu Paul - Gheorghe <barbu.paul.gheorghe@gmail.com>
# Date 1354650884 -7200
# Node ID 6c472a21a5887c5295a331c48c4da188ec2c8413
# Parent  aaab44133a6830c9a00263731d098c01cc1d6fb5
selfrestart now magically locates the current dwm (no need to hardcode a path)

diff -r aaab44133a68 -r 6c472a21a588 config.def.h
--- a/config.def.h	Tue Dec 04 21:54:44 2012 +0200
+++ b/config.def.h	Tue Dec 04 21:54:44 2012 +0200
@@ -54,6 +54,8 @@
 static const char *termcmd[]  = { "urxvtc", NULL };
 static const char *filemancmd[]  = { "thunar", NULL };
 
+#include "selfrestart.c"
+
 static Key keys[] = {
 	/* modifier                     key        function        argument */
 	{ MODKEY,                       XK_r,      spawn,          {.v = dmenucmd } },
@@ -89,6 +91,7 @@
 	TAGKEYS(                        XK_7,                      6)
 	TAGKEYS(                        XK_8,                      7)
 	TAGKEYS(                        XK_9,                      8)
+    { MODKEY|ShiftMask,             XK_r,      self_restart,   {0} },
 	{ MODKEY|ShiftMask,             XK_q,      quit,           {0} },
 };
 
@@ -108,4 +111,3 @@
 	{ ClkTagBar,            MODKEY,         Button1,        tag,            {0} },
 	{ ClkTagBar,            MODKEY,         Button3,        toggletag,      {0} },
 };
-
diff -r aaab44133a68 -r 6c472a21a588 selfrestart.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/selfrestart.c	Tue Dec 04 21:54:44 2012 +0200
@@ -0,0 +1,65 @@
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+/**
+ * Magically finds the current's executable path
+ *
+ * I'm doing the do{}while(); trick because Linux (what I'm running) is not
+ * POSIX compilant and so lstat() cannot be trusted on /proc entries
+ *
+ * @return char* the path of the current executable
+ */
+char *get_dwm_path(){
+    struct stat s;
+    int r, length, rate = 42;
+    char *path = NULL;
+
+    if(lstat("/proc/self/exe", &s) == -1){
+        perror("lstat:");
+        return NULL;
+    }
+
+    length = s.st_size + 1 - rate;
+
+    do{
+        length+=rate;
+
+        free(path);
+        path = malloc(sizeof(char) * length);
+
+        if(path == NULL){
+            perror("malloc:");
+            return NULL;
+        }
+
+        r = readlink("/proc/self/exe", path, length);
+
+        if(r == -1){
+            perror("readlink:");
+            return NULL;
+        }
+    }while(r >= length);
+
+    path[r] = '\0';
+
+    return path;
+}
+
+/**
+ * self-restart
+ *
+ * Initially inspired by: Yu-Jie Lin
+ * https://sites.google.com/site/yjlnotes/notes/dwm
+ */
+void self_restart(const Arg *arg) {
+    char *const argv[] = {get_dwm_path(), NULL};
+
+    if(argv[0] == NULL){
+        return;
+    }
+
+    execv(argv[0], argv);
+}