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freebsd/etc/rc.d/savecore
Gavin Atkinson 9e9a57a307 After writing a kernel core dump into /var/crash, call sync(8).
If we panic again shortly after boot (say, within 30 seconds), any core
dump we wrote out may be lost on reboot.  In this situation, we really
want to keep that core file, as it may be the only way to have the issue
resolved.  Call sync(8) after writing out the core file and running
crashinfo(8), in the hope that these will not be lost if we panic
again.  sync(8) is only called in the case where there is a core dump
to be written out, so won't be called during normal boots.

Discovered by:	Trying to debug an IPSEC panic
MFC after:	1 week
2013-08-28 15:12:15 +00:00

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#!/bin/sh
#
# $FreeBSD$
#
# PROVIDE: savecore
# REQUIRE: dumpon ddb syslogd
# KEYWORD: nojail
. /etc/rc.subr
name="savecore"
start_cmd="savecore_start"
start_precmd="savecore_prestart"
stop_cmd=":"
savecore_prestart()
{
# Quit if we have no dump device
case ${dumpdev} in
[Nn][Oo] | '')
debug 'No dump device. Quitting.'
return 1
;;
[Aa][Uu][Tt][Oo])
if [ ! -L /dev/dumpdev ]; then
return 1
fi
dumpdev=`/bin/realpath /dev/dumpdev`
;;
esac
# If there is no crash directory set it now
case ${dumpdir} in
'')
dumpdir='/var/crash'
;;
[Nn][Oo])
dumpdir='NO'
;;
esac
if [ ! -c "${dumpdev}" ]; then
warn "Dump device does not exist. Savecore not run."
return 1
fi
if [ ! -d "${dumpdir}" ]; then
warn "Dump directory does not exist. Savecore not run."
return 1
fi
return 0
}
savecore_start()
{
local dev
case "${dumpdev}" in
[Aa][Uu][Tt][Oo])
dev=
;;
*)
dev="${dumpdev}"
;;
esac
if savecore -C "${dev}" >/dev/null; then
savecore ${savecore_flags} ${dumpdir} ${dumpdev}
if checkyesno crashinfo_enable; then
${crashinfo_program} -d ${dumpdir}
fi
sync
else
check_startmsgs && echo 'No core dumps found.'
fi
}
load_rc_config $name
run_rc_command "$1"