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97 lines
4.2 KiB
Plaintext
97 lines
4.2 KiB
Plaintext
Logging and backgrounding
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By default, bb_[p]error_msg[_and_die] messages go to stderr,
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and of course, usually applets do not auto-background. :)
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Historically, daemons and inetd services are different.
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Busybox is trying to provide compatible behavior, thus if an applet
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is emulating an existing utility, it should mimic it. If utility
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auto-backgrounds itself, busybox applet should do the same.
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If utility normally logs to syslog, busybox applet should do
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the same too.
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However, busybox should not needlessly restrict the freedom
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of the users. And users have different needs and different preferences.
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Some might like logging everything from daemons to syslog.
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Others prefer running stuff under runsv/svlogd and thus would like
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logging to stderr and no daemonization.
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To help with that, busybox applets should have options to override
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default behavior, whatever that is for a given applet.
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Current situation is a bit of a mess:
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acpid - auto-backgrounds unless -d
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crond - auto-backgrounds unless -f, logs to syslog unless -d or -L.
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option -d logs to stderr, -L FILE logs to FILE
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devfsd - (obsolete)
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dnsd - option -d makes it background and log to syslog
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fakeidentd - inetd service. Auto-backgrounds and logs to syslog
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if no -f and no -i and no -w (-i is "inetd service" flag,
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-w is "inetd-wait service" flag)
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ftpd - inetd service. Logs to syslog with -S, with -v logs to strerr too
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httpd - auto-backgrounds unless -f or -i (-i is "inetd service" flag)
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inetd - auto-backgrounds unless -f, logs to syslog unless -e
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klogd - auto-backgrounds unless -n
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syslogd - auto-backgrounds unless -n
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telnetd - auto-backgrounds unless -f or -i (-i is "inetd service" flag)
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udhcpc - auto-backgrounds unless -f after lease is obtained,
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option -b makes it background sooner (when lease attempt
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fails and retries start),
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after backgrounding it stops logging to stderr;
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logs to stderr, but option -S makes it log *also* to syslog
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udhcpd - auto-backgrounds and do not log to stderr unless -f,
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otherwise logs to stderr, but option -S makes it log *also* to syslog
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zcip - auto-backgrounds and logs *also* to syslog unless -f
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Total: 13 applets (+1 obsolete),
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4 log to syslog by default (crond fakeidentd inetd zcip),
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5 never log to syslog (acpid httpd telnetd klogd syslogd, last two
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- for obviously correct reasons),
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there are no daemons which always log to syslog,
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12 auto-background if not run as inetd services (all except dnsd.
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Note that there is no "standard" dnsd AFAIKS). But see below
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for daemons (tcpsvd etc) which don't auto-background.
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miscutils/crond.c: logmode = LOGMODE_SYSLOG;
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networking/dnsd.c: logmode = LOGMODE_SYSLOG;
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networking/ftpd.c: logmode = LOGMODE_NONE;
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networking/ftpd.c: logmode |= LOGMODE_SYSLOG;
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networking/inetd.c: logmode = LOGMODE_SYSLOG;
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networking/isrv_identd.c: logmode = LOGMODE_SYSLOG;
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networking/telnetd.c: logmode = LOGMODE_SYSLOG;
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networking/udhcp/dhcpc.c: logmode = LOGMODE_NONE;
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networking/udhcp/dhcpc.c: logmode |= LOGMODE_SYSLOG;
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networking/udhcp/dhcpc.c: logmode &= ~LOGMODE_STDIO;
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networking/udhcp/dhcpd.c: logmode = LOGMODE_NONE;
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networking/udhcp/dhcpd.c: logmode |= LOGMODE_SYSLOG;
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networking/zcip.c: logmode |= LOGMODE_SYSLOG;
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These daemons never auto-background and never log to syslog:
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lpd - inetd service. Has nothing to log so far, though
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dhcprelay - standard behavior
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inotifyd - standard behavior
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runsv - standard behavior
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runsvdir - standard behavior
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svlogd - standard behavior
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tcpsvd, udpsvd - standard behavior
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tftpd - standard behavior
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Non-daemons (seems to be use syslog for a good reason):
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networking/nameif.c: logmode |= LOGMODE_SYSLOG;
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loginutils/chpasswd.c: logmode = LOGMODE_BOTH;
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loginutils/chpasswd.c: logmode = LOGMODE_STDIO;
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loginutils/getty.c: logmode = LOGMODE_BOTH;
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loginutils/getty.c: logmode = LOGMODE_NONE;
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loginutils/passwd.c: logmode = LOGMODE_STDIO;
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loginutils/passwd.c: logmode = LOGMODE_BOTH;
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loginutils/sulogin.c: logmode = LOGMODE_SYSLOG; (used if stdio isn't a tty)
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loginutils/sulogin.c: logmode = LOGMODE_BOTH;
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util-linux/mount.c: logmode = LOGMODE_SYSLOG; (used in a backgrounded NFS mount helper)
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