[PATCH] remove udev_lib dependency from udevsend, which makes it smaller

Makefile

@@ -300,7 +300,7 @@ $(DAEMON): $(LIBC) $(DAEMON).o $(OBJS) udevd.h
 	$(QUIET) $(STRIPCMD) $@
 
 $(SENDER): $(LIBC) $(SENDER).o $(OBJS) udevd.h
-	$(QUIET) $(LD) $(LDFLAGS) -o $@ $(CRT0) udevsend.o udev_lib.o $(LIB_OBJS) $(ARCH_LIB_OBJS)
+	$(QUIET) $(LD) $(LDFLAGS) -o $@ $(CRT0) udevsend.o $(LIB_OBJS) $(ARCH_LIB_OBJS)
 	$(QUIET) $(STRIPCMD) $@
 
 $(WAIT): $(WAIT).o $(OBJS) $(HEADERS) $(LIBC)

udev_lib.c

@@ -229,22 +229,3 @@ int call_foreach_file(int fnct(char *f) , char *dirname, char *suffix)
 	closedir(dir);
 	return 0;
 }
-
-/* Set the FD_CLOEXEC  flag of desc if value is nonzero,
-   or clear the flag if value is 0.
-   Return 0 on success, or -1 on error with errno  set. */ 
-	
-int set_cloexec_flag (int desc, int value)
-{
-	int oldflags = fcntl (desc, F_GETFD, 0);
-	/* If reading the flags failed, return error indication now. */
-	if (oldflags < 0)
-		return oldflags;
-	/* Set just the flag we want to set. */
-	if (value != 0)
-		oldflags |= FD_CLOEXEC;
-	else
-		oldflags &= ~FD_CLOEXEC;
-	/* Store modified flag word in the descriptor. */
-	return fcntl (desc, F_SETFD, oldflags);
-}

udev_lib.h

@@ -85,6 +85,5 @@ extern void file_unmap(char *buf, size_t bufsize);
 extern size_t buf_get_line(char *buf, size_t buflen, size_t cur);
 extern void no_trailing_slash(char *path);
 extern int  call_foreach_file(int fnct(char *f) , char *filename, char *extension);
-extern int set_cloexec_flag (int desc, int value);
 
 #endif

udevd.c

@@ -43,6 +43,9 @@
 #include "udevd.h"
 #include "logging.h"
 
+/* global variables*/
+static int udevsendsock;
+
 static int pipefds[2];
 static unsigned long long expected_seqnum = 0;
 static volatile int sigchilds_waiting;
@@ -127,6 +130,7 @@ static void udev_run(struct hotplug_msg *msg)
 	switch (pid) {
 	case 0:
 		/* child */
+		close(udevsendsock);
 		execle(udev_bin, "udev", msg->subsystem, NULL, msg->envp);
 		dbg("exec of child failed");
 		_exit(1);
@@ -397,7 +401,7 @@ static void user_sighandler(void)
 
 int main(int argc, char *argv[], char *envp[])
 {
-	int ssock, maxsockplus;
+	int maxsockplus;
 	struct sockaddr_un saddr;
 	socklen_t addrlen;
 	int retval, fd;
@@ -476,28 +480,21 @@ int main(int argc, char *argv[], char *envp[])
 	strcpy(&saddr.sun_path[1], UDEVD_SOCK_PATH);
 	addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(saddr.sun_path+1) + 1;
 
-	ssock = socket(AF_LOCAL, SOCK_DGRAM, 0);
-	if (ssock == -1) {
+	udevsendsock = socket(AF_LOCAL, SOCK_DGRAM, 0);
+	if (udevsendsock == -1) {
 		dbg("error getting socket, exit");
 		exit(1);
 	}
 
-	set_cloexec_flag(ssock, 1);
-
 	/* the bind takes care of ensuring only one copy running */
-	retval = bind(ssock, (struct sockaddr *) &saddr, addrlen);
+	retval = bind(udevsendsock, (struct sockaddr *) &saddr, addrlen);
 	if (retval < 0) {
 		dbg("bind failed, exit");
 		goto exit;
 	}
-	retval = fcntl(ssock, F_SETFD, FD_CLOEXEC);
-	if (retval < 0) {
-		dbg("error fcntl on ssock: %s", strerror(errno));
-		exit(1);
-	}
 
 	/* enable receiving of the sender credentials */
-	setsockopt(ssock, SOL_SOCKET, SO_PASSCRED, &feature_on, sizeof(feature_on));
+	setsockopt(udevsendsock, SOL_SOCKET, SO_PASSCRED, &feature_on, sizeof(feature_on));
 
 	/* possible override of udev binary, used for testing */
 	udev_bin = getenv("UDEV_BIN");
@@ -507,9 +504,9 @@ int main(int argc, char *argv[], char *envp[])
 		udev_bin = UDEV_BIN;
 
 	FD_ZERO(&readfds);
-	FD_SET(ssock, &readfds);
+	FD_SET(udevsendsock, &readfds);
 	FD_SET(pipefds[0], &readfds);
-	maxsockplus = ssock+1;
+	maxsockplus = udevsendsock+1;
 	while (1) {
 		fd_set workreadfds = readfds;
 		retval = select(maxsockplus, &workreadfds, NULL, NULL, NULL);
@@ -520,8 +517,8 @@ int main(int argc, char *argv[], char *envp[])
 			continue;
 		}
 
-		if (FD_ISSET(ssock, &workreadfds))
-			handle_udevsend_msg(ssock);
+		if (FD_ISSET(udevsendsock, &workreadfds))
+			handle_udevsend_msg(udevsendsock);
 
 		if (FD_ISSET(pipefds[0], &workreadfds))
 			user_sighandler();
@@ -548,7 +545,7 @@ int main(int argc, char *argv[], char *envp[])
 		}
 	}
 exit:
-	close(ssock);
+	close(udevsendsock);
 	logging_close();
 	return 1;
 }

udevsend.c

@@ -41,6 +41,9 @@
 #include "udevd.h"
 #include "logging.h"
 
+/* global variables */
+static int sock = -1;
+
 #ifdef LOG
 unsigned char logname[LOGNAME_SIZE];
 void log_message (int level, const char *format, ...)
@@ -66,8 +69,7 @@ static int start_daemon(void)
 		switch (child_pid) {
 		case 0:
 			/* daemon */
-			setsid();
-			chdir("/");
+			close(sock);
 			execl(UDEVD_BIN, "udevd", NULL);
 			dbg("exec of daemon failed");
 			_exit(1);
@@ -119,7 +121,6 @@ int main(int argc, char *argv[], char *envp[])
 	int subsystem_env = 0;
 	int bufpos = 0;
 	int retval = 1;
-	int sock = -1;
 	int started_daemon = 0;
 
 	logging_init("udevsend");
@@ -137,8 +138,6 @@ int main(int argc, char *argv[], char *envp[])
 		goto fallback;
 	}
 
-	set_cloexec_flag(sock, 1);
-
 	memset(&saddr, 0x00, sizeof(struct sockaddr_un));
 	saddr.sun_family = AF_LOCAL;
 	/* use abstract namespace for socket path */