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>

1 files changed, 127 insertions, 0 deletions

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;
+}