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801c438304
assignments to the literal values it would have returned.
The concept of set_rcvar() was nice in theory, but the forks
it creates are a drag on the startup process, which is especially
noticeable on slower systems, such as embedded ones.
During the discussion on freebsd-rc@ a preference was expressed for
using ${name}_enable instead of the literal values. However the
code portability concept doesn't really apply since there are so
many other places where the literal name has to be searched for
and replaced. Also, using the literal value is also a tiny bit
faster than dereferencing the variables, and every little bit helps.
99 lines
2.1 KiB
Bash
Executable File
99 lines
2.1 KiB
Bash
Executable File
#!/bin/sh
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# $FreeBSD$
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#
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# PROVIDE: netwait
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# REQUIRE: NETWORKING
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# KEYWORD: nojail
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#
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# The netwait script is intended to be used by systems which have
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# statically-configured IP addresses in rc.conf(5). If your system
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# uses DHCP, you should use synchronous_dhclient="YES" in your
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# /etc/rc.conf instead of using netwait.
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. /etc/rc.subr
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name="netwait"
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rcvar="netwait_enable"
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start_cmd="${name}_start"
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stop_cmd=":"
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netwait_start()
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{
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local ip rc count output link
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if [ -z "${netwait_ip}" ]; then
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err 1 "You must define one or more IP addresses in netwait_ip"
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fi
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if [ ${netwait_timeout} -lt 1 ]; then
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err 1 "netwait_timeout must be >= 1"
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fi
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# Handle SIGINT (Ctrl-C); force abort of while() loop
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trap break SIGINT
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if [ -n "${netwait_if}" ]; then
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echo -n "Waiting for $netwait_if to have link"
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count=1
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while [ ${count} -le ${netwait_if_timeout} ]; do
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if output=`/sbin/ifconfig ${netwait_if} 2>/dev/null`; then
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link=`expr "${output}" : '.*[[:blank:]]status: \(no carrier\)'`
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if [ -z "${link}" ]; then
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echo '.'
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break
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fi
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else
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echo ''
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err 1 "ifconfig ${netwait_if} failed"
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fi
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sleep 1
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count=$((count+1))
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done
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if [ -n "${link}" ]; then
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# Restore default SIGINT handler
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trap - SIGINT
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echo ''
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warn "Interface still has no link. Continuing with startup, but"
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warn "be aware you may not have a fully functional networking"
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warn "layer at this point."
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return
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fi
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fi
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# Handle SIGINT (Ctrl-C); force abort of while() loop
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trap break SIGINT
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for ip in ${netwait_ip}; do
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echo -n "Waiting for ${ip} to respond to ICMP"
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count=1
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while [ ${count} -le ${netwait_timeout} ]; do
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/sbin/ping -t 1 -c 1 -o ${ip} >/dev/null 2>&1
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rc=$?
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if [ $rc -eq 0 ]; then
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# Restore default SIGINT handler
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trap - SIGINT
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echo '.'
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return
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fi
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count=$((count+1))
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done
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echo ': No response from host.'
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done
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# Restore default SIGINT handler
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trap - SIGINT
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warn "Exhausted IP list. Continuing with startup, but be aware you may"
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warn "not have a fully functional networking layer at this point."
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}
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load_rc_config $name
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run_rc_command "$1"
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