Win32 + ctrl-c of child processes

ruby-talk
1

Ruby under Unix allows me to see if a child process died of a signal.
E.g. ruby 1.8.0 I can check $?.signaled?.

Unlike Unix, under Win32, $?.signaled? is not true when the child dies
of Ctrl-C.

Is this a known, fixable bug or a limitation of Windows?

2

Hi,

···

At Thu, 6 Feb 2003 05:25:38 +0900, Matt Armstrong wrote:

Ruby under Unix allows me to see if a child process died of a signal.
E.g. ruby 1.8.0 I can check $?.signaled?.

Unlike Unix, under Win32, $?.signaled? is not true when the child dies
of Ctrl-C.

Is this a known, fixable bug or a limitation of Windows?

Also command.com/cmd.exe tell you nothing about it, I guess
it’s a limitation of Windows. GetExitCodeProcess() API returns
exit code only. Anyone has more info?

–
Nobu Nakada

3

Ruby under Unix allows me to see if a child process died of a signal.
E.g. ruby 1.8.0 I can check $?.signaled?.

Unlike Unix, under Win32, $?.signaled? is not true when the child dies
of Ctrl-C.

Is this a known, fixable bug or a limitation of Windows?

I wrote this routine for my clutil win.rb lib[1], that calls spawnvp
asynchronously. The async call returns the process handle. “The return value
from a synchronous _spawnv or _wspawnv (_P_WAIT specified for mode) is the
exit status of the new process. … The exit status is 0 if the process
terminated normally. … If the new process did not explicitly set a
positive exit status, a positive exit status indicates an abnormal exit with
an abort or an interrupt.”

So, maybe tweaking what I’ve done below for a sync call will give you a
suitable workraround for what you need – though notice my comment about
segfaults – I haven’t tinkered with this on any newer versions
(1.6.8/1.8.0-preview)

P_WAIT = 0
P_NOWAIT = 1
OLD_P_OVERLAY = 2
P_NOWAITO = 3
P_DETACH = 4

def async_system(command)

···

wnv.asp

this is working – but frequently Segfaults ruby 1.6.6 mswin32

spawn = Win32API.new(“crtdll”, “_spawnvp”, [‘I’, ‘P’, ‘P’] ,‘L’)
res = spawn.Call(P_NOWAIT, command, ‘’)
if res == -1
Win32API.new(“crtdll”, “perror”, [‘P’], ‘V’).call(‘async_system’)
end
res
end

[1] http://clabs.org/dl/clutil/clutil.2003.027.0.zip

Chris

4

Hello,

In message “Re: win32 + ctrl-c of child processes”

···

on Feb.06,2003 09:46:00, nobu.nokada@softhome.net wrote:

Also command.com/cmd.exe tell you nothing about it, I guess
it’s a limitation of Windows. GetExitCodeProcess() API returns
exit code only. Anyone has more info?

Borland C++Builder’s help says that wait() returns information
about how child process died by using bit 0-7 of status word,
just like same function of UNIX.
But I don’t know how C++Builder gets the information, and also
don’t know whether it works really.

Regards,

U.Nakamura usa@osb.att.ne.jp

5

“U.Nakamura” usa@osb.att.ne.jp writes:

Hello,

In message “Re: win32 + ctrl-c of child processes”

Also command.com/cmd.exe tell you nothing about it, I guess
it’s a limitation of Windows. GetExitCodeProcess() API returns
exit code only. Anyone has more info?

Borland C++Builder’s help says that wait() returns information
about how child process died by using bit 0-7 of status word,
just like same function of UNIX.
But I don’t know how C++Builder gets the information, and also
don’t know whether it works really.

Actually I just need a way to spawn a child process without blocking
SIGINT.

trap('SIGINT') {
  puts "got SIGINT"
}
ret = system('ruby -e "loop {}"')
puts "after system #{ret}"
if $?.exited?
  puts "exited with %d" % [ $?.exitstatus ]
end
if $?.signaled?
  puts "signaled with %d" % [ $?.termsig ]
end
if $?.coredump?
  puts "coredump!"
end

E.g. both Unix and Windows never print “got SIGINT” but under Unix I
can write my own “system” with fork/exec.

I have a separate Win32 C program that installs a SIGINT handler
with signal() before using spawnvp() to spawn a child process. In
this way it receives notice of Ctrl-C. But it does not look like I
can currently do this with Ruby, true?

··· 
on Feb.06,2003 09:46:00, <nobu.nokada@softhome.net> wrote: