$ qemu-x86_64 --version
qemu-x86_64 version 9.0.50 (v9.0.0-1211-gd16cab541a)
Copyright (c) 2003-2024 Fabrice Bellard and the QEMU Project developers
$ cat fork.rb
begin
r, w = IO.pipe
if pid1 = fork
w.close
r.read 1
Process.kill "USR1", pid1
Process.wait2 pid1
else
print "child\n"
r.close
if pid2 = fork
trap("USR1") { print "child: kill\n"; Process.kill "USR2", pid2 }
w.close
print "child: wait\n"
Process.wait2 pid2
else
print "grandchild\n"
w.close
sleep 0.2
end
end
end
$ ruby fork.rb
child
child: wait
grandchild
child: kill
$ qemu-x86_64 /usr/bin/ruby fork.rb
child
child: wait
^Z
[1]+ Stopped qemu-x86_64 /usr/bin/ruby fork.rb
$ grep SigB $(for p in $(pidof qemu-x86_64); do echo /proc/$p/status; done |
sort)
/proc/3221/status:SigBlk: 0000000000000000
/proc/3224/status:SigBlk: 0000000000000000
/proc/3228/status:SigBlk: fffffff27ffbfa9f
--
Andreas Schwab, SUSE Labs, sch...@suse.de
GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE 1748 E4D4 88E3 0EEA B9D7
"And now for something completely different."
