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mdev: add syslog logging mode

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If mdev is run as daemon it should be possible to forward the debug
messages to syslog. This feature might be useful if mdev is run with -s
during boot too. OTOH it makes no sense for the daemon to log to
mdev.log. This can be handled by a syslog daemon way better. If the
daemon stays in the foreground due to -f, the messages are still written
to stderr as before.

Signed-off-by: Jan Klötzke <jan@kloetzke.net>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Jan Klötzke 2019-12-16 22:56:53 +01:00 committed by Denys Vlasenko
parent d560030548
commit e9003caf6d
1 changed files with 18 additions and 6 deletions
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24
util-linux/mdev.c
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@ -80,7 +80,7 @@
//kbuild:lib-$(CONFIG_MDEV) += mdev.o
//usage:#define mdev_trivial_usage
//usage: "[-s]" IF_FEATURE_MDEV_DAEMON(" | [-df]")
//usage: "[-S] " IF_FEATURE_MDEV_DAEMON("[") "[-s]" IF_FEATURE_MDEV_DAEMON(" | [-df]]")
//usage:#define mdev_full_usage "\n\n"
//usage: "mdev -s is to be run during boot to scan /sys and populate /dev.\n"
//usage: IF_FEATURE_MDEV_DAEMON(
@ -88,6 +88,9 @@
//usage: " -f: stay in foreground.\n"
//usage: )
//usage: "\n"
//usage: "optional arguments:\n"
//usage: " -S: Log to syslog too\n"
//usage: "\n"
//usage: "Bare mdev is a kernel hotplug helper. To activate it:\n"
//usage: " echo /sbin/mdev >/proc/sys/kernel/hotplug\n"
//usage: IF_FEATURE_MDEV_CONF(
@ -113,6 +116,7 @@
#include "common_bufsiz.h"
#include "xregex.h"
#include <linux/netlink.h>
#include <syslog.h>
/* "mdev -s" scans /sys/class/xxx, looking for directories which have dev
* file (it is of the form "M:m\n"). Example: /sys/class/tty/tty0/dev
@ -1237,8 +1241,9 @@ int mdev_main(int argc UNUSED_PARAM, char **argv)
{
enum {
MDEV_OPT_SCAN = 1 << 0,
MDEV_OPT_DAEMON = 1 << 1,
MDEV_OPT_FOREGROUND = 1 << 2,
MDEV_OPT_SYSLOG = 1 << 1,
MDEV_OPT_DAEMON = 1 << 2,
MDEV_OPT_FOREGROUND = 1 << 3,
};
int opt;
RESERVE_CONFIG_BUFFER(temp, PATH_MAX + SCRATCH_SIZE);
@ -1254,7 +1259,7 @@ int mdev_main(int argc UNUSED_PARAM, char **argv)
xchdir("/dev");
opt = getopt32(argv, "s" IF_FEATURE_MDEV_DAEMON("df"));
opt = getopt32(argv, "sS" IF_FEATURE_MDEV_DAEMON("df"));
#if ENABLE_FEATURE_MDEV_CONF
G.filename = "/etc/mdev.conf";
@ -1264,8 +1269,17 @@ int mdev_main(int argc UNUSED_PARAM, char **argv)
}
#endif
if (opt & MDEV_OPT_SYSLOG) {
openlog(applet_name, LOG_PID, LOG_DAEMON);
logmode |= LOGMODE_SYSLOG;
}
#if ENABLE_FEATURE_MDEV_DAEMON
if (opt & MDEV_OPT_DAEMON) {
// there is no point in write()ing to /dev/null
if (!(opt & MDEV_OPT_FOREGROUND))
logmode &= ~LOGMODE_STDIO;
/*
* Daemon mode listening on uevent netlink socket. Fork away
* after initial scan so that caller can be sure everything
@ -1276,8 +1290,6 @@ int mdev_main(int argc UNUSED_PARAM, char **argv)
if (!(opt & MDEV_OPT_FOREGROUND))
bb_daemonize_or_rexec(0, argv);
open_mdev_log(NULL, getpid());
daemon_loop(temp, fd);
}
#endif