watchdog: add -T option

function                                             old     new   delta
 watchdog_main                                        159     219     +60
mdev: support match by major,minor. See bug 4714.
 +100 bytes.

debianutils/start_stop_daemon.c

@@ -428,7 +428,7 @@ int start_stop_daemon_main(int argc UNUSED_PARAM, char **argv)
 		write_pidfile(pidfile);
 	}
 	if (opt & OPT_c) {
-		struct bb_uidgid_t ugid;
+		struct bb_uidgid_t ugid = { -1, -1 };
 		parse_chown_usergroup_or_die(&ugid, chuid);
 		if (ugid.gid != (gid_t) -1) xsetgid(ugid.gid);
 		if (ugid.uid != (uid_t) -1) xsetuid(ugid.uid);

docs/mdev.txt

@@ -51,9 +51,11 @@ device nodes if your system needs something more than the default root/root
 660 permissions.
 
 The file has the format:
-	<device regex> <uid>:<gid> <octal permissions>
+    <device regex>       <uid>:<gid> <octal permissions>
+ or @<maj[,min1[-min2]]> <uid>:<gid> <octal permissions>
+
 For example:
-	hd[a-z][0-9]* 0:3 660
+    hd[a-z][0-9]* 0:3 660
 
 The config file parsing stops at the first matching line.  If no line is
 matched, then the default of 0:0 660 is used.  To set your own default, simply

include/usage.h

@@ -4561,14 +4561,15 @@
        "Mon Dec 17 10:31:44 GMT 2000"
 
 #define watchdog_trivial_usage \
-       "[-t N[ms]] [-F] DEV"
+       "[-t N[ms]] [-T N[ms]] [-F] DEV"
 #define watchdog_full_usage "\n\n" \
        "Periodically write to watchdog device DEV\n" \
      "\nOptions:" \
-     "\n	-t N	Timer period (default 30)" \
+     "\n	-T N	Reboot after N seconds if not reset (default 60)" \
+     "\n	-t N	Reset every N seconds (default 30)" \
      "\n	-F	Run in foreground" \
      "\n" \
-     "\nUse -t 500ms to specify period in milliseconds" \
+     "\nUse 500ms to specify period in milliseconds" \
 
 #define wc_trivial_usage \
        "[OPTION]... [FILE]..."

libpwdgrp/uidgid_get.c

@@ -87,15 +87,12 @@ void FAST_FUNC xget_uidgid(struct bb_uidgid_t *u, const char *ug)
  * ":group" sets gid only
  * "user:" sets uid and gid (to user's primary group id)
  * "user:group" sets uid and gid
- * ('unset' uid or gid is actually set to -1)
+ * ('unset' uid or gid retains the value it has on entry)
  */
 void FAST_FUNC parse_chown_usergroup_or_die(struct bb_uidgid_t *u, char *user_group)
 {
 	char *group;
 
-	u->uid = -1;
-	u->gid = -1;
-
 	/* Check if there is a group name */
 	group = strchr(user_group, '.'); /* deprecated? */
 	if (!group)

miscutils/watchdog.c

@@ -4,14 +4,17 @@
  *
  * Copyright (C) 2003  Paul Mundt <lethal@linux-sh.org>
  * Copyright (C) 2006  Bernhard Fischer <busybox@busybox.net>
+ * Copyright (C) 2008  Darius Augulis <augulis.darius@gmail.com>
  *
  * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
  */
 
 #include "libbb.h"
+#include "linux/watchdog.h"
 
-#define OPT_FOREGROUND 0x01
-#define OPT_TIMER      0x02
+#define OPT_FOREGROUND  (1 << 0)
+#define OPT_STIMER      (1 << 1)
+#define OPT_HTIMER      (1 << 2)
 
 static void watchdog_shutdown(int sig UNUSED_PARAM)
 {
@@ -26,38 +29,42 @@ static void watchdog_shutdown(int sig UNUSED_PARAM)
 int watchdog_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int watchdog_main(int argc, char **argv)
 {
+	static const struct suffix_mult suffixes[] = {
+		{ "ms", 1 },
+		{ "", 1000 },
+		{ }
+	};
+
 	unsigned opts;
-	unsigned timer_duration = 30000; /* Userspace timer duration, in milliseconds */
-	char *t_arg;
+	unsigned stimer_duration; /* how often to restart */
+	unsigned htimer_duration = 60000; /* reboots after N ms if not restarted */
+	char *st_arg;
+	char *ht_arg;
 
-	opt_complementary = "=1"; /* must have 1 argument */
-	opts = getopt32(argv, "Ft:", &t_arg);
+	opt_complementary = "=1"; /* must have exactly 1 argument */
+	opts = getopt32(argv, "Ft:T:", &st_arg, &ht_arg);
 
-	if (opts & OPT_TIMER) {
-		static const struct suffix_mult suffixes[] = {
-			{ "ms", 1 },
-			{ "", 1000 },
-			{ }
-		};
-		timer_duration = xatou_sfx(t_arg, suffixes);
-	}
-
-	if (!(opts & OPT_FOREGROUND)) {
-		bb_daemonize_or_rexec(DAEMON_CHDIR_ROOT, argv);
-	}
+	if (opts & OPT_HTIMER)
+		htimer_duration = xatou_sfx(ht_arg, suffixes);
+	stimer_duration = htimer_duration / 2;
+	if (opts & OPT_STIMER)
+		stimer_duration = xatou_sfx(st_arg, suffixes);
 
 	bb_signals(BB_FATAL_SIGS, watchdog_shutdown);
 
 	/* Use known fd # - avoid needing global 'int fd' */
 	xmove_fd(xopen(argv[argc - 1], O_WRONLY), 3);
 
-// TODO?
-//	if (!(opts & OPT_TIMER)) {
-//		if (ioctl(fd, WDIOC_GETTIMEOUT, &timer_duration) == 0)
-//			timer_duration *= 500;
-//		else
-//			timer_duration = 30000;
-//	}
+	ioctl_or_warn(3, WDIOC_SETTIMEOUT, &htimer_duration);
+#if 0
+	ioctl_or_warn(3, WDIOC_GETTIMEOUT, &htimer_duration);
+	printf("watchdog: SW timer is %dms, HW timer is %dms\n",
+		stimer_duration, htimer_duration * 1000);
+#endif
+
+	if (!(opts & OPT_FOREGROUND)) {
+		bb_daemonize_or_rexec(DAEMON_CHDIR_ROOT, argv);
+	}
 
 	while (1) {
 		/*
@@ -65,7 +72,7 @@ int watchdog_main(int argc, char **argv)
 		 * is undefined at this point -- PFM
 		 */
 		write(3, "", 1); /* write zero byte */
-		usleep(timer_duration * 1000L);
+		usleep(stimer_duration * 1000L);
 	}
 	return EXIT_SUCCESS; /* - not reached, but gcc 4.2.1 is too dumb! */
 }

testsuite/mdev.tests

@@ -98,7 +98,6 @@ brw-r--r-- 1 0 0 a_sda
 
 # continuing to use directory structure from prev test
 rm -rf mdev.testdir/dev/*
-# here we complicate things by having non-matching group 1 and using %0
 echo "sda 0:0 644 @echo @echo TEST" >mdev.testdir/etc/mdev.conf
 testing "mdev command" \
 	"env - PATH=$PATH ACTION=add DEVPATH=/block/sda chroot mdev.testdir /mdev 2>&1;
@@ -110,6 +109,18 @@ brw-r--r-- 1 0 0 8,0 sda
 " \
 	"" ""
 
+# continuing to use directory structure from prev test
+rm -rf mdev.testdir/dev/*
+echo "@8,0 :1 644" >mdev.testdir/etc/mdev.conf
+testing "mdev #maj,min and no explicit uid" \
+	"env - PATH=$PATH ACTION=add DEVPATH=/block/sda chroot mdev.testdir /mdev 2>&1;
+	ls -lnR mdev.testdir/dev | $FILTER_LS" \
+"\
+mdev.testdir/dev:
+brw-r--r-- 1 0 1 8,0 sda
+" \
+	"" ""
+
 # clean up
 rm -rf mdev.testdir
 

util-linux/mdev.c

@@ -59,8 +59,7 @@ static void make_device(char *path, int delete)
 	int major, minor, type, len;
 	int mode = 0660;
 #if ENABLE_FEATURE_MDEV_CONF
-	uid_t uid = 0;
-	gid_t gid = 0;
+	struct bb_uidgid_t ugid = { 0, 0 };
 	parser_t *parser;
 	char *tokens[5];
 #endif
@@ -78,9 +77,10 @@ static void make_device(char *path, int delete)
 
 	/* Try to read major/minor string.  Note that the kernel puts \n after
 	 * the data, so we don't need to worry about null terminating the string
-	 * because sscanf() will stop at the first nondigit, which \n is.  We
-	 * also depend on path having writeable space after it.
+	 * because sscanf() will stop at the first nondigit, which \n is.
+	 * We also depend on path having writeable space after it.
 	 */
+	major = -1;
 	if (!delete) {
 		strcpy(dev_maj_min, "/dev");
 		len = open_read_close(path, dev_maj_min + 1, 64);
@@ -90,6 +90,8 @@ static void make_device(char *path, int delete)
 				return;
 			/* no "dev" file, so just try to run script */
 			*dev_maj_min = '\0';
+		} else if (sscanf(dev_maj_min, "%u:%u", &major, &minor) != 2) {
+			major = -1;
 		}
 	}
 
@@ -113,8 +115,23 @@ static void make_device(char *path, int delete)
 
 		/* Fields: regex uid:gid mode [alias] [cmd] */
 
-		/* 1st field: regex to match this device */
-		{
+		/* 1st field: @<numeric maj,min>... */
+		if (tokens[0][0] == '@') {
+			/* @major,minor[-last] */
+			/* (useful when name is ambiguous:
+			 * "/sys/class/usb/lp0" and
+			 * "/sys/class/printer/lp0") */
+			int cmaj, cmin0, cmin1, sc;
+			if (major < 0)
+				continue; /* no dev, no match */
+			sc = sscanf(tokens[0], "@%u,%u-%u", &cmaj, &cmin0, &cmin1);
+			if (sc < 1 || major != cmaj
+			 || (sc == 2 && minor != cmin0)
+			 || (sc == 3 && (minor < cmin0 || minor > cmin1))
+			) {
+				continue; /* no match */
+			}
+		} else { /* ... or regex to match device name */
 			regex_t match;
 			int result;
 
@@ -144,27 +161,7 @@ static void make_device(char *path, int delete)
 		 * after parsing the rest of fields */
 
 		/* 2nd field: uid:gid - device ownership */
-		{
-			struct passwd *pass;
-			struct group *grp;
-			char *str_uid = tokens[1];
-			char *str_gid = strchrnul(str_uid, ':');
-
-			if (*str_gid)
-				*str_gid++ = '\0';
-			/* Parse UID */
-			pass = getpwnam(str_uid);
-			if (pass)
-				uid = pass->pw_uid;
-			else
-				uid = strtoul(str_uid, NULL, 10);
-			/* Parse GID */
-			grp = getgrnam(str_gid);
-			if (grp)
-				gid = grp->gr_gid;
-			else
-				gid = strtoul(str_gid, NULL, 10);
-		}
+		parse_chown_usergroup_or_die(&ugid, tokens[1]);
 
 		/* 3rd field: mode - device permissions */
 		mode = strtoul(tokens[2], NULL, 8);
@@ -243,7 +240,7 @@ static void make_device(char *path, int delete)
 	config_close(parser);
 #endif /* ENABLE_FEATURE_MDEV_CONF */
 
-	if (!delete && sscanf(dev_maj_min, "%u:%u", &major, &minor) == 2) {
+	if (!delete && major >= 0) {
 
 		if (ENABLE_FEATURE_MDEV_RENAME)
 			unlink(device_name);
@@ -255,7 +252,7 @@ static void make_device(char *path, int delete)
 			symlink(device_name, "root");
 
 #if ENABLE_FEATURE_MDEV_CONF
-		chown(device_name, uid, gid);
+		chown(device_name, ugid.uid, ugid.gid);
 
 #if ENABLE_FEATURE_MDEV_RENAME
 		if (alias) {