X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=udevsend.c;h=b564d6453fce3020af181f8dccd600fa26147405;hb=3874126807efcc61eded424aace7e40c79a025a7;hp=c738fe22459fc55e43211236e9125d3b18963b48;hpb=d026a35d747c0a993281408a9644ab843cf89fdd;p=elogind.git

diff --git a/udevsend.c b/udevsend.c
index c738fe224..b564d6453 100644
--- a/udevsend.c
+++ b/udevsend.c
@@ -26,22 +26,23 @@
 #include <sys/socket.h>
 #include <sys/wait.h>
 #include <sys/un.h>
+#include <time.h>
 #include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <stddef.h>
 #include <string.h>
 #include <unistd.h>
-#include <time.h>
 #include <linux/stddef.h>
 
 #include "udev.h"
+#include "udev_lib.h"
 #include "udev_version.h"
 #include "udevd.h"
 #include "logging.h"
 
 #ifdef LOG
-unsigned char logname[42];
+unsigned char logname[LOGNAME_SIZE];
 void log_message (int level, const char *format, ...)
 {
 	va_list	args;
@@ -52,42 +53,6 @@ void log_message (int level, const char *format, ...)
 }
 #endif
 
-static inline char *get_action(void)
-{
-	char *action;
-
-	action = getenv("ACTION");
-	return action;
-}
-
-static inline char *get_devpath(void)
-{
-	char *devpath;
-
-	devpath = getenv("DEVPATH");
-	return devpath;
-}
-
-static inline char *get_seqnum(void)
-{
-	char *seqnum;
-
-	seqnum = getenv("SEQNUM");
-	return seqnum;
-}
-
-static int build_hotplugmsg(struct hotplug_msg *msg, char *action,
-			    char *devpath, char *subsystem, int seqnum)
-{
-	memset(msg, 0x00, sizeof(*msg));
-	strfieldcpy(msg->magic, UDEV_MAGIC);
-	msg->seqnum = seqnum;
-	strncpy(msg->action, action, 8);
-	strncpy(msg->devpath, devpath, 128);
-	strncpy(msg->subsystem, subsystem, 16);
-	return sizeof(struct hotplug_msg);
-}
-
 static int start_daemon(void)
 {
 	pid_t pid;
@@ -117,11 +82,31 @@ static int start_daemon(void)
 		dbg("fork of helper failed");
 		return -1;
 	default:
-		wait(NULL);
+		waitpid(pid, NULL, 0);
 	}
 	return 0;
 }
 
+static void run_udev(const char *subsystem)
+{
+	pid_t pid;
+
+	pid = fork();
+	switch (pid) {
+	case 0:
+		/* child */
+		execl(UDEV_BIN, UDEV_BIN, subsystem, NULL);
+		dbg("exec of child failed");
+		_exit(1);
+		break;
+	case -1:
+		dbg("fork of child failed");
+		break;
+	default:
+		waitpid(pid, NULL, 0);
+	}
+}
+
 int main(int argc, char* argv[])
 {
 	struct hotplug_msg msg;
@@ -129,92 +114,105 @@ int main(int argc, char* argv[])
 	char *devpath;
 	char *subsystem;
 	char *seqnum;
-	int seq;
+	unsigned long long seq;
 	int retval = 1;
-	int size;
 	int loop;
-	struct timespec tspec;
-	int sock;
+	int sock = -1;
 	struct sockaddr_un saddr;
 	socklen_t addrlen;
 	int started_daemon = 0;
 
-#ifdef DEBUG
-	init_logging("udevsend");
-#endif
+	logging_init("udevsend");
+	dbg("version %s", UDEV_VERSION);
 
-	subsystem = argv[1];
+	subsystem = get_subsystem(argv[1]);
 	if (subsystem == NULL) {
 		dbg("no subsystem");
 		goto exit;
 	}
+	dbg("subsystem = '%s'", subsystem);
 
 	devpath = get_devpath();
 	if (devpath == NULL) {
 		dbg("no devpath");
 		goto exit;
 	}
+	dbg("DEVPATH = '%s'", devpath);
 
 	action = get_action();
 	if (action == NULL) {
 		dbg("no action");
 		goto exit;
 	}
+	dbg("ACTION = '%s'", action);
 
 	seqnum = get_seqnum();
 	if (seqnum == NULL)
-		seq = -1;
+		seq = 0;
 	else
-		seq = atoi(seqnum);
+		seq = strtoull(seqnum, NULL, 10);
+	dbg("SEQNUM = '%llu'", seq);
 
 	sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
 	if (sock == -1) {
 		dbg("error getting socket");
-		goto exit;
+		goto fallback;
 	}
 
-	memset(&saddr, 0x00, sizeof(saddr));
+	set_cloexec_flag(sock, 1);
+
+	memset(&saddr, 0x00, sizeof(struct sockaddr_un));
 	saddr.sun_family = AF_LOCAL;
 	/* use abstract namespace for socket path */
 	strcpy(&saddr.sun_path[1], UDEVD_SOCK_PATH);
 	addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(saddr.sun_path+1) + 1;
 
-	size = build_hotplugmsg(&msg, action, devpath, subsystem, seq);
+	memset(&msg, 0x00, sizeof(struct hotplug_msg));
+	strcpy(msg.magic, UDEV_MAGIC);
+	msg.seqnum = seq;
+	strfieldcpy(msg.action, action);
+	strfieldcpy(msg.devpath, devpath);
+	strfieldcpy(msg.subsystem, subsystem);
 
 	/* If we can't send, try to start daemon and resend message */
-	loop = UDEVSEND_CONNECT_RETRY;
-	while (loop--) {
-		retval = sendto(sock, &msg, size, 0, (struct sockaddr *)&saddr, addrlen);
+	loop = SEND_WAIT_MAX_SECONDS * SEND_WAIT_LOOP_PER_SECOND;
+	while (--loop) {
+		retval = sendto(sock, &msg, sizeof(struct hotplug_msg), 0,
+				(struct sockaddr *)&saddr, addrlen);
 		if (retval != -1) {
 			retval = 0;
-			goto close_and_exit;
+			goto exit;
 		}
-		
+
 		if (errno != ECONNREFUSED) {
 			dbg("error sending message");
-			goto close_and_exit;
+			goto fallback;
 		}
-		
+
 		if (!started_daemon) {
-			dbg("connect failed, try starting daemon...");
+			info("starting udevd daemon");
 			retval = start_daemon();
 			if (retval) {
-				dbg("error starting daemon");
-				goto exit;
+				info("error starting daemon");
+				goto fallback;
 			}
-			
 			dbg("daemon started");
 			started_daemon = 1;
 		} else {
-			dbg("retry to connect %d", UDEVSEND_CONNECT_RETRY - loop);
-			tspec.tv_sec = 0;
-			tspec.tv_nsec = 100000000;  /* 100 millisec */
-			nanosleep(&tspec, NULL);
+			dbg("retry to connect %d", SEND_WAIT_MAX_SECONDS * SEND_WAIT_LOOP_PER_SECOND - loop);
+			usleep(1000 * 1000 / SEND_WAIT_LOOP_PER_SECOND);
 		}
 	}
-	
-close_and_exit:
-	close(sock);
+
+fallback:
+	info("unable to connect to event daemon, try to call udev directly");
+	run_udev(subsystem);
+
 exit:
+	if (sock != -1)
+		close(sock);
+
+	logging_close();
+
 	return retval;
 }