udeveventrecorder: add small program that writes an event to disk

Used for debugging and event replay from initramfs.

Signed-off-by: Kay Sievers <kay.sievers@suse.de>

4 files changed, 153 insertions, 7 deletions

diff --git a/Makefile b/Makefile
index d36bd5866c..9ad6ee103b 100644
--- a/Makefile
+++ b/Makefile
@@ -45,6 +45,7 @@ ROOT =		udev
 DAEMON =	udevd
 SENDER =	udevsend
 INITSENDER =	udevinitsend
+RECORDER =	udeveventrecorder
 CONTROL =	udevcontrol
 INFO =		udevinfo
 TESTER =	udevtest
@@ -204,7 +205,7 @@ endif
 # config files automatically generated
 GEN_CONFIGS =	$(LOCAL_CFG_DIR)/udev.conf
 
-all: $(ROOT) $(SENDER) $(INITSENDER) $(CONTROL) $(DAEMON) $(INFO) $(TESTER) $(STARTER) $(GEN_CONFIGS) $(KLCC)
+all: $(ROOT) $(SENDER) $(INITSENDER) $(RECORDER) $(CONTROL) $(DAEMON) $(INFO) $(TESTER) $(STARTER) $(GEN_CONFIGS) $(KLCC)
 	@extras="$(EXTRAS)" ; for target in $$extras ; do \
 		echo $$target ; \
 		$(MAKE) prefix=$(prefix) \
@@ -271,6 +272,7 @@ $(INFO).o: $(HEADERS) $(GEN_HEADERS) $(HOST_PROGS) $(KLCC)
 $(DAEMON).o: $(HEADERS) $(GEN_HEADERS) $(HOST_PROGS) $(KLCC)
 $(SENDER).o: $(HEADERS) $(GEN_HEADERS) $(HOST_PROGS) $(KLCC)
 $(INITSENDER).o: $(GEN_HEADERS) $(HOST_PROGS) $(KLCC)
+$(RECORDER).o: $(GEN_HEADERS) $(HOST_PROGS) $(KLCC)
 $(CONTROL).o: $(HEADERS) $( $(HEADERS)GEN_HEADERS) $(HOST_PROGS) $(KLCC)
 $(STARTER).o: $(HEADERS) $(GEN_HEADERS) $(HOST_PROGS) $(KLCC)
 
@@ -298,6 +300,10 @@ $(INITSENDER): $(KLCC) $(INITSENDER).o $(OBJS) udevd.h
 	$(QUIET) $(LD) $(LDFLAGS) -o $@ $(INITSENDER).o $(OBJS) $(LIB_OBJS)
 	$(QUIET) $(STRIPCMD) $@
 
+$(RECORDER): $(KLCC) $(RECORDER).o $(OBJS) udevd.h
+	$(QUIET) $(LD) $(LDFLAGS) -o $@ $(RECORDER).o $(OBJS) $(LIB_OBJS)
+	$(QUIET) $(STRIPCMD) $@
+
 $(CONTROL): $(KLCC) $(CONTROL).o $(OBJS) udevd.h
 	$(QUIET) $(LD) $(LDFLAGS) -o $@ $(CONTROL).o $(OBJS) $(LIB_OBJS)
 	$(QUIET) $(STRIPCMD) $@
@@ -313,7 +319,7 @@ clean:
 	-find . \( -not -type d \) -and \( -name '*~' -o -name '*.[oas]' \) -type f -print \
 	 | xargs rm -f 
 	-rm -f core $(ROOT) $(GEN_HEADERS) $(GEN_CONFIGS) $(GEN_MANPAGES) $(INFO) $(DAEMON) \
-	 $(SENDER) $(INITSENDER) $(CONTROL) $(TESTER) $(STARTER)
+	 $(SENDER) $(INITSENDER) $(RECORDER) $(CONTROL) $(TESTER) $(STARTER)
 	-rm -f ccdv
 	$(MAKE) -C klibc SUBDIRS=klibc clean
 	@extras="$(EXTRAS)" ; for target in $$extras ; do \
@@ -374,6 +380,7 @@ install: install-config install-man install-dev.d all
 	$(INSTALL_PROGRAM) -D $(DAEMON) $(DESTDIR)$(sbindir)/$(DAEMON)
 	$(INSTALL_PROGRAM) -D $(SENDER) $(DESTDIR)$(sbindir)/$(SENDER)
 	$(INSTALL_PROGRAM) -D $(INITSENDER) $(DESTDIR)$(sbindir)/$(INITSENDER)
+	$(INSTALL_PROGRAM) -D $(RECORDER) $(DESTDIR)$(sbindir)/$(RECORDER)
 	$(INSTALL_PROGRAM) -D $(CONTROL) $(DESTDIR)$(sbindir)/$(CONTROL)
 	$(INSTALL_PROGRAM) -D $(INFO) $(DESTDIR)$(usrbindir)/$(INFO)
 	$(INSTALL_PROGRAM) -D $(TESTER) $(DESTDIR)$(usrbindir)/$(TESTER)
@@ -400,6 +407,7 @@ uninstall: uninstall-man uninstall-dev.d
 	- rm $(sbindir)/$(DAEMON)
 	- rm $(sbindir)/$(SENDER)
 	- rm $(sbindir)/$(INITSENDER)
+	- rm $(sbindir)/$(RECORDER)
 	- rm $(sbindir)/$(CONTROL)
 	- rm $(sbindir)/$(STARTER)
 	- rm $(usrbindir)/$(INFO)
diff --git a/udevd.c b/udevd.c
index 873b05d946..f4c986b870 100644
--- a/udevd.c
+++ b/udevd.c
@@ -660,7 +660,7 @@ static void udev_done(int pid)
 	list_for_each_entry(msg, &running_list, node) {
 		if (msg->pid == pid) {
 			sysinfo(&info);
-			info("seq %llu exit, %ld sec old", msg->seqnum, info.uptime - msg->queue_time);
+			info("seq %llu exit, %ld seconds old", msg->seqnum, info.uptime - msg->queue_time);
 			run_queue_delete(msg);
 
 			/* we want to run the exec queue manager since there may
@@ -951,9 +951,9 @@ int main(int argc, char *argv[], char *envp[])
 			msg = get_nl_msg();
 			if (msg) {
 				msg_queue_insert(msg);
-				/* disable kernel uevent_helper with first netlink message */
+				/* disable udevsend with first netlink message */
 				if (!uevent_nl_active) {
-					info("uevent_nl message received, disable uevent_helper messages");
+					info("uevent_nl message received, disable udevsend messages");
 					uevent_nl_active = 1;
 				}
 			}
diff --git a/udeveventrecorder.c b/udeveventrecorder.c
new file mode 100644
index 0000000000..af7ea7c15c
--- /dev/null
+++ b/udeveventrecorder.c
@@ -0,0 +1,127 @@
+/*
+ * udeveventrecorder.c
+ *
+ * Userspace devfs
+ *
+ * Copyright (C) 2004, 2005 Olaf Hering <olh@suse.de>
+ *
+ *	This program is free software; you can redistribute it and/or modify it
+ *	under the terms of the GNU General Public License as published by the
+ *	Free Software Foundation version 2 of the License.
+ * 
+ *	This program is distributed in the hope that it will be useful, but
+ *	WITHOUT ANY WARRANTY; without even the implied warranty of
+ *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *	General Public License for more details.
+ * 
+ *	You should have received a copy of the GNU General Public License along
+ *	with this program; if not, write to the Free Software Foundation, Inc.,
+ *	675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+#include "udev.h"
+#include "udev_version.h"
+#include "udev_utils.h"
+#include "logging.h"
+
+#define BUFSIZE 12345
+#define FNSIZE  123
+
+static int log = 0;
+
+#ifdef USE_LOG
+void log_message (int priority, const char *format, ...)
+{
+	va_list	args;
+
+	if (priority > log)
+		return;
+
+	va_start(args, format);
+	vsyslog(priority, format, args);
+	va_end(args);
+}
+#endif
+
+int main(int argc, char **argv, char **envp)
+{
+	int fd, i;
+	unsigned long seq;
+	char **ep = envp;
+	char *buf, *p, *a;
+	struct stat sb;
+	const char *env;
+
+	if (stat("/events", &sb) || !(S_ISDIR(sb.st_mode)))
+		return 1;
+
+	env = getenv("UDEV_LOG");
+	if (env)
+		log = log_priority(env);
+
+	logging_init("udeveventrecorder");
+	dbg("version %s", UDEV_VERSION);
+
+	p = getenv("SEQNUM");
+	a = getenv("ACTION");
+	buf = malloc(FNSIZE);
+	if (!(buf && a && argv[1]))
+		goto error;
+	if (p)
+		seq = strtoul(p, NULL, 0);
+	else
+		seq = 0;
+
+	snprintf(buf, FNSIZE, "/events/debug.%05lu.%s.%s.%u", seq, argv[1], a ? a : "", getpid());
+	if ((fd = open(buf, O_CREAT | O_WRONLY | O_TRUNC, 0644)) < 0) {
+		err("error creating '%s'", buf);
+		goto error;
+	}
+	free(buf);
+	p = malloc(BUFSIZE);
+	buf = p;
+	buf += snprintf(buf, p + BUFSIZE - buf, "set --");
+	for (i = 1; i < argc; ++i) {
+		buf += snprintf(buf, p + BUFSIZE - buf, " %s", argv[i]);
+		if (buf > p + BUFSIZE)
+			goto full;
+	}
+	buf += snprintf(buf, p + BUFSIZE - buf, "\n");
+	if (buf > p + BUFSIZE)
+		goto full;
+	while (*ep) {
+		unsigned char *t;
+		t = memchr(*ep, '=', strlen(*ep));
+		if (t) {
+			*t = '\0';
+			t++;
+			buf += snprintf(buf, p + BUFSIZE - buf, "%s='%s'\n", *ep, t);
+			--t;
+			*t = '=';
+		}
+		ep++;
+		if (buf > p + BUFSIZE)
+			break;
+	}
+
+full:
+	buf = p;
+	write(fd, buf, strlen(buf));
+	close(fd);
+	free(buf);
+	return 0;
+
+error:
+	fprintf(stderr, "record enviroment to /events, to be called from udev context\n");
+	return 1;
+}
diff --git a/udevinitsend.c b/udevinitsend.c
index c7d56fc259..31a7109d1b 100644
--- a/udevinitsend.c
+++ b/udevinitsend.c
@@ -23,6 +23,7 @@
 #include <stdio.h>
 #include <stddef.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <unistd.h>
 #include <fcntl.h>
 #include <errno.h>
@@ -38,16 +39,21 @@
 #include "udev.h"
 #include "udev_version.h"
 #include "udevd.h"
+#include "udev_utils.h"
 #include "logging.h"
 
+static int log = 0;
 
 #ifdef USE_LOG
-void log_message (int level, const char *format, ...)
+void log_message (int priority, const char *format, ...)
 {
 	va_list	args;
 
+	if (priority > log)
+		return;
+
 	va_start(args, format);
-	vsyslog(level, format, args);
+	vsyslog(priority, format, args);
 	va_end(args);
 }
 #endif
@@ -164,6 +170,11 @@ int main(int argc, char *argv[], char *envp[])
 	int retval = 1;
 	int disable_loop_detection = 0;
 	int sock;
+	const char *env;
+
+	env = getenv("UDEV_LOG");
+	if (env)
+		log = log_priority(env);
 
 	logging_init("udevinitsend");
 	dbg("version %s", UDEV_VERSION);