dwmblocks-statuscmd-signal.diff

diff --git a/dwmblocks.c b/dwmblocks.c
index 2f3b774..ba7dbb5 100644
--- a/dwmblocks.c
+++ b/dwmblocks.c
@@ -14,6 +14,7 @@ typedef struct {
 	unsigned int signal;
 } Block;
 void sighandler(int num);
+void buttonhandler(int sig, siginfo_t *si, void *ucontext);
 void getcmds(int time);
 #ifndef __OpenBSD__
 void getsigcmds(int signal);
@@ -33,15 +34,32 @@ static int screen;
 static Window root;
 static char statusbar[LENGTH(blocks)][CMDLENGTH] = {0};
 static char statusstr[2][256];
+static char button[] = "\0";
 static int statusContinue = 1;
 static void (*writestatus) () = setroot;
 
 //opens process *cmd and stores output in *output
 void getcmd(const Block *block, char *output)
 {
+	if (block->signal)
+	{
+		output[0] = block->signal;
+		output++;
+	}
 	strcpy(output, block->icon);
 	char *cmd = block->command;
-	FILE *cmdf = popen(cmd,"r");
+	FILE *cmdf;
+	if (*button)
+	{
+		setenv("BUTTON", button, 1);
+		cmdf = popen(cmd,"r");
+		*button = '\0';
+		unsetenv("BUTTON");
+	}
+	else
+	{
+		cmdf = popen(cmd,"r");
+	}
 	if (!cmdf)
 		return;
 	char c;
@@ -79,12 +97,18 @@ void getsigcmds(int signal)
 
 void setupsignals()
 {
+	struct sigaction sa;
 	for(int i = 0; i < LENGTH(blocks); i++)
 	{	  
 		if (blocks[i].signal > 0)
+		{
 			signal(SIGRTMIN+blocks[i].signal, sighandler);
+			sigaddset(&sa.sa_mask, SIGRTMIN+blocks[i].signal); // ignore signal when handling SIGUSR1
+		}
 	}
-
+	sa.sa_sigaction = buttonhandler;
+	sa.sa_flags = SA_SIGINFO;
+	sigaction(SIGUSR1, &sa, NULL);
 }
 #endif
 
@@ -143,6 +167,13 @@ void sighandler(int signum)
 	getsigcmds(signum-SIGRTMIN);
 	writestatus();
 }
+
+void buttonhandler(int sig, siginfo_t *si, void *ucontext)
+{
+	*button = '0' + si->si_value.sival_int & 0xff;
+	getsigcmds(si->si_value.sival_int >> 8);
+	writestatus();
+}
 #endif
 
 void termhandler(int signum)