add awesome-client to communicate via awesome socket

Makefile

@@ -6,7 +6,10 @@ include config.mk
 SRC = client.c draw.c event.c layout.c awesome.c tag.c util.c config.c screen.c statusbar.c uicb.c tab.c window.c
 OBJ = ${SRC:.c=.o} ${LAYOUTS:.c=.o}
 
-all: options awesome
+SRCCLIENT = awesome-client.c util.c
+OBJCLIENT = ${SRCCLIENT:.c=.o}
+
+all: options awesome awesome-client
 
 options:
 	@echo awesome build options:
@@ -21,6 +24,12 @@ options:
 
 ${OBJ}: awesome.h config.mk
 
+${OBJCLIENT}: config.mk
+
+awesome-client: ${OBJCLIENT}
+	@echo -e \\t\(CC\) ${OBJCLIENT} -o $@
+	@${CC} -o $@ ${OBJCLIENT} ${LDFLAGS}
+
 awesome: ${OBJ}
 	@echo -e \\t\(CC\) ${OBJ} -o $@
 	@${CC} -o $@ ${OBJ} ${LDFLAGS}

awesome-client.c

@@ -0,0 +1,43 @@
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+
+#include "util.h"
+
+#define CONTROL_UNIX_SOCKET_PATH ".awesome_so_ctl"
+
+int
+main()
+{
+    ssize_t path_len;
+    struct sockaddr_un addr;
+    char buf[1024];
+    const char *homedir;
+    int csfd;
+    
+    homedir = getenv("HOME");
+    path_len = a_strlen(homedir) + a_strlen(CONTROL_UNIX_SOCKET_PATH) + 2;
+    if(path_len >= (int)sizeof(addr.sun_path))
+    {
+        fprintf(stderr, "error: path of control UNIX domain socket is too long");
+        exit(1);
+    }
+    a_strcpy(addr.sun_path, path_len, homedir);
+    a_strcat(addr.sun_path, path_len, "/");
+    a_strcat(addr.sun_path, path_len, CONTROL_UNIX_SOCKET_PATH);
+    csfd = socket(AF_UNIX, SOCK_DGRAM, 0);
+    if(csfd < 0)
+        perror("error opening UNIX domain socket");
+    addr.sun_family = AF_UNIX;
+    while(fgets(buf, sizeof(buf), stdin))
+    {
+        if(sendto(csfd, buf, strlen(buf), MSG_NOSIGNAL, (struct sockaddr*)&addr, sizeof(addr)) == -1)
+            perror("error sending datagram");
+    }
+}
+// vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99