dwm/local-r1615-selfrestart.diff

diff -up -N a/config.def.h b/config.def.h
--- a/config.def.h	2020-12-01 10:21:09.920859006 +0100
+++ b/config.def.h	2020-12-01 10:22:27.167535028 +0100
@@ -66,6 +66,8 @@ static char dmenumon[2] = "0"; /* compon
 static const char *dmenucmd[] = { "dmenu_run", "-m", dmenumon, "-fn", dmenufont, "-nb", col_gray1, "-nf", col_gray3, "-sb", col_cyan, "-sf", col_gray4, NULL };
 static const char *termcmd[]  = { "st", NULL };
 
+#include "selfrestart.c"
+
 static Key keys[] = {
 	/* modifier                     key        function        argument */
 	{ MODKEY,                       XK_p,      spawn,          {.v = dmenucmd } },
@@ -103,6 +105,7 @@ static Key keys[] = {
 	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} },
 };
 
diff -up -N a/selfrestart.c b/selfrestart.c
--- a/selfrestart.c	1970-01-01 01:00:00.000000000 +0100
+++ b/selfrestart.c	2020-12-01 10:24:06.714211651 +0100
@@ -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);
+}