Added dwmblocks-pulse-listener.c

.gitignore

@@ -1,56 +1,3 @@
-# Custom blocks file
 blocks.h
-
-# Prerequisites
-*.d
-
-# Object files
-*.o
-*.ko
-*.obj
-*.elf
-
-# Linker output
-*.ilk
-*.map
-*.exp
-
-# Precompiled Headers
-*.gch
-*.pch
-
-# Libraries
-*.lib
-*.a
-*.la
-*.lo
-
-# Shared objects (inc. Windows DLLs)
-*.dll
-*.so
-*.so.*
-*.dylib
-
-# Executables
-*.exe
-*.out
-*.app
-*.i*86
-*.x86_64
-*.hex
 dwmblocks
-
+dwmblocks-pulse-listener
-# Debug files
-*.dSYM/
-*.su
-*.idb
-*.pdb
-
-# Kernel Module Compile Results
-*.mod*
-*.cmd
-.tmp_versions/
-modules.order
-Module.symvers
-Mkfile.old
-dkms.conf

Makefile

@@ -2,32 +2,38 @@ PREFIX  := /usr/local
 CC      := cc
 CFLAGS  := -pedantic -Wall -Wno-deprecated-declarations -Os
 LDFLAGS := -lX11
+PULSEFLAGS := -lpulse
 
 # FreeBSD (uncomment)
 #LDFLAGS += -L/usr/local/lib -I/usr/local/include
 # # OpenBSD (uncomment)
 #LDFLAGS += -L/usr/X11R6/lib -I/usr/X11R6/include
 
-all: options dwmblocks
+all: options dwmblocks dwmblocks-pulse-listener
 
 options:
 	@echo dwmblocks build options:
 	@echo "CFLAGS  = ${CFLAGS}"
 	@echo "LDFLAGS = ${LDFLAGS}"
 	@echo "CC      = ${CC}"
+	@echo "PULSEFLAGS = ${PULSEFLAGS}"
 
 dwmblocks: dwmblocks.c blocks.def.h blocks.h
 	${CC} -o dwmblocks dwmblocks.c ${CFLAGS} ${LDFLAGS}
 
+dwmblocks-pulse-listener: dwmblocks-pulse-listener.c
+	${CC} -o dwmblocks-pulse-listener dwmblocks-pulse-listener.c ${CFLAGS} ${PULSEFLAGS}
+
 blocks.h:
 	cp blocks.def.h $@
 
 clean:
-	rm -f *.o *.gch dwmblocks
+	rm -f *.o *.gch dwmblocks dwmblocks-pulse-listener
 
 install: dwmblocks
 	mkdir -p ${DESTDIR}${PREFIX}/bin
 	cp -f dwmblocks ${DESTDIR}${PREFIX}/bin
+	cp -f dwmblocks-pulse-listener ${DESTDIR}${PREFIX}/bin
 	chmod 755 ${DESTDIR}${PREFIX}/bin/dwmblocks
 	install -m0755 scripts/* ${DESTDIR}${PREFIX}/bin
 

blocks.def.h

@@ -4,7 +4,7 @@
 static const Block blocks[] = {
     /*Icon*/    /*Command*/     /*Update Interval*/ /*Update Signal*/
     {"", "dwmblocks-battery", SECONDS(10), 0},
-    {"", "dwmblocks-volume", 125, 0},
+    {"", "dwmblocks-volume", 0, 1},
     {" ", "date +'%a %b %d'", SECONDS(30), 0},
     {" ", "date +'%R'", SECONDS(2), 0},
     {"", "dwmblocks-network", SECONDS(5), 0},

dwmblocks-pulse-listener.c

@@ -0,0 +1,121 @@
+#include <pulse/pulseaudio.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <sys/signal.h>
+#include <limits.h>
+
+#define ERROR(...) fprintf(stderr, "error: " __VA_ARGS__)
+
+typedef struct {
+    size_t pid;
+    unsigned int signum;
+} TargetData;
+
+static void sink_info_callback(pa_context *ctx, const pa_sink_info *info,
+                               int eol, TargetData *target) {
+    if (info) {
+        kill(target->pid, target->signum);
+    }
+}
+
+static void server_info_callback(pa_context *ctx, const pa_server_info *info,
+                                 TargetData *target) {
+    pa_operation *op = pa_context_get_sink_info_by_name(
+            ctx,
+            info->default_sink_name,
+            (pa_sink_info_cb_t) sink_info_callback,
+            target);
+    pa_operation_unref(op);
+}
+
+static void subscribe_callback(pa_context *ctx,
+                               pa_subscription_event_type_t type, uint32_t idx,
+                               TargetData *target) {
+    unsigned int facility = type & PA_SUBSCRIPTION_EVENT_FACILITY_MASK;
+    pa_operation *op = NULL;
+    switch (facility) {
+    case PA_SUBSCRIPTION_EVENT_SINK:
+        op = pa_context_get_sink_info_by_index(ctx,
+                                               idx,
+                                               (pa_sink_info_cb_t) sink_info_callback,
+                                               target);
+        break;
+    }
+    if (op) {
+        pa_operation_unref(op);
+    }
+}
+
+static void state_callback(pa_context *ctx, TargetData *target) {
+    pa_operation *op;
+    switch (pa_context_get_state(ctx)) {
+    case PA_CONTEXT_READY:
+        op = pa_context_get_server_info(ctx,
+                                        (pa_server_info_cb_t) server_info_callback,
+                                        target);
+        pa_operation_unref(op);
+        pa_context_set_subscribe_callback(ctx,
+                                          (pa_context_subscribe_cb_t) subscribe_callback,
+                                          target);
+        op = pa_context_subscribe(ctx, PA_SUBSCRIPTION_MASK_SINK, NULL, NULL);
+        pa_operation_unref(op);
+        break;
+    case PA_CONTEXT_FAILED:
+        kill(target->pid, target->signum);
+        break;
+    default:
+        break;
+    }
+}
+
+int main(int argc, const char **argv) {
+    if (argc < 2) {
+        ERROR("no pid\n");
+        return 1;
+    }
+    char *endptr = NULL;
+    unsigned int signum = SIGRTMIN + 1;
+    if (argc >= 3 && argv[1][0] == '-') {
+        const char *signumstr = argv[1] + 1;
+        unsigned long num = strtoul(signumstr, &endptr, 10);
+        if (num > (SIGRTMAX - SIGRTMIN) + 1) {
+            ERROR("signal out of range: %lu\n", num);
+            return 1;
+        }
+        signum = SIGRTMIN + num;
+        ++argv;
+    }
+    endptr = NULL;
+    errno = 0;
+    unsigned long pid = strtoul(argv[1], &endptr, 10);
+    if (argv[1][0] == '-' || errno == ERANGE) {
+        ERROR("pid out of range: \"%s\"\n", argv[1]);
+        return 1;
+    }
+    pa_mainloop *mainloop = pa_mainloop_new();
+    if (!mainloop) {
+        ERROR("could not create pulse mainloop\n");
+        return 1;
+    }
+    pa_mainloop_api *api = pa_mainloop_get_api(mainloop);
+    if (!api) {
+        ERROR("could not create pulse mainloop api\n");
+        return 1;
+    }
+    pa_context *context = pa_context_new(api, "dwmblocks-listener");
+    if (!context) {
+        ERROR("could not create pulse context\n");
+        return 1;
+    }
+    TargetData target = { pid, signum };
+    pa_context_set_state_callback( context,
+                                  (pa_context_notify_cb_t)&state_callback,
+                                  &target);
+    if (pa_context_connect(context, NULL, PA_CONTEXT_NOAUTOSPAWN, NULL) < 0) {
+        ERROR("could not connect to pulse");
+        return 1;
+    }
+    pa_mainloop_run(mainloop, NULL);
+    return 0;
+}

dwmblocks.c

@@ -64,7 +64,7 @@ void getcmd(const Block *block, char *output) {
         return;
     }
     int i = strlen(block->icon);
-    fgets(output+i, CMDLENGTH-i-delimLen, cmdf);
+    fgets(output + i, CMDLENGTH - i - delimLen, cmdf);
     i = strlen(output);
     if (i == 0) {
         //return if block and command output are both empty
@@ -72,9 +72,9 @@ void getcmd(const Block *block, char *output) {
         return;
     }
     //only chop off newline if one is present at the end
-    i = output[i-1] == '\n' ? i-1 : i;
+    i = output[i - 1] == '\n' ? i - 1 : i;
     if (delim[0] != '\0') {
-        strncpy(output+i, delim, delimLen);
+        strncpy(output + i, delim, delimLen);
     } else {
         output[i++] = '\0';
     }
@@ -83,7 +83,7 @@ void getcmd(const Block *block, char *output) {
 
 void getcmds(int time) {
     const Block* current;
-    for (unsigned int i = 0; i < LENGTH(blocks); i++) {
+    for (unsigned int i = 0; i < LENGTH(blocks); ++i) {
         current = blocks + i;
         if ((current->interval != 0 && time % current->interval == 0) || time == -1) {
             getcmd(current,statusbar[i]);
@@ -93,7 +93,7 @@ void getcmds(int time) {
 
 void getsigcmds(unsigned int signal) {
     const Block *current;
-    for (unsigned int i = 0; i < LENGTH(blocks); i++) {
+    for (unsigned int i = 0; i < LENGTH(blocks); ++i) {
         current = blocks + i;
         if (current->signal == signal) {
             getcmd(current,statusbar[i]);
@@ -116,14 +116,14 @@ void sighandler(int signum) {
 void setupsignals() {
 #ifndef __OpenBSD__
     /* initialize all real time signals with dummy handler */
-    for (int i = SIGRTMIN; i <= SIGRTMAX; i++) {
+    for (int i = SIGRTMIN; i <= SIGRTMAX; ++i) {
         signal(i, dummysighandler);
     }
 #endif
 
-    for (unsigned int i = 0; i < LENGTH(blocks); i++) {
+    for (unsigned int i = 0; i < LENGTH(blocks); ++i) {
         if (blocks[i].signal > 0) {
-            signal(SIGMINUS+blocks[i].signal, sighandler);
+            signal(SIGMINUS + blocks[i].signal, sighandler);
         }
     }
 
@@ -132,7 +132,7 @@ void setupsignals() {
 int getstatus(char *str, char *last) {
     strcpy(last, str);
     str[0] = '\0';
-    for (unsigned int i = 0; i < LENGTH(blocks); i++) {
+    for (unsigned int i = 0; i < LENGTH(blocks); ++i) {
         strcat(str, statusbar[i]);
     }
     str[strlen(str)-strlen(delim)] = '\0';
@@ -160,7 +160,7 @@ int gcd(int n1, int n2) {
 void statusloop() {
     setupsignals();
     unsigned int interval = -1;
-    for (int i = 0; i < LENGTH(blocks); i++){
+    for (int i = 0; i < LENGTH(blocks); ++i){
         if (blocks[i].interval){
             interval = gcd(blocks[i].interval, interval);
         }