[BZ-1534] ACE_Process::spawn() w/ avoid_zombies should return real process id

[jwillemsen]

Field	Value
Bugzilla ID	1534
Reporter	cumminss
Assigned to	@shuston
Product	ACE
Component	ACE Core
Version	5.3.1
Platform / OS	x86 / Linux
Priority	P3
Severity	normal
Status	NEW
Resolution
Created	2003-06-11 15:30:31 -0500

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Originally posted by cumminss on 2003-06-11 15:30:31 -0500

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The ACE_Process::getpid() function doesn't always return the process ID. If
ACE_Process_Options::avoid_zombies(1) is used on the option struct passed to
ACE_Process::spawn(), then the getpid() will return 1 if the process started
successfuly rather than the child pid. Either the function or documentation
should be modified to note this distinction.

[jwillemsen]

Originally posted by Nanbor Wang on 2003-06-25 13:08:09 -0500 (Bugzilla comment 1)

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Accpetd for tao-support

[jwillemsen]

Originally posted by Nanbor Wang on 2003-09-14 23:24:02 -0500 (Bugzilla comment 2)

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Giovanni Zito g.zito@acsys.it also reported the following:

SYNOPSIS:
    When using avoid_zombies() in ACE_Process_Options, and then =

spawn the process, the spawn() method should return
the pid of child process. Instead it always returns 1. This =
doesn't allow to use getpid(), running() and kill() methods =
consistently.

DESCRIPTION:
    This is due ACE::fork() method implementation, in that it =

returns -1, 1 or 0. This could be avoided using the "ignoring SIGCHILD" =
method.

REPEAT BY:

#include <ace/Process.h>

int main( int argc, char** argv)
{
ACE_Process process ;
ACE_Process_Options options ;
options.avoid_zombies(1) ;

options.command_line( argv[1] ) ;
pid_t childPid =3D process.spawn( options ) ;
std::cerr << "Spawned process [" << process.getpid() << "]" << =
std::endl ;
=20
std::cerr << "Process [" << process.wait() << "] exited." << =
std::endl ;
=20
return 0;
}

[jwillemsen]

Originally posted by Nanbor Wang on 2003-09-14 23:28:23 -0500 (Bugzilla comment 3)

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Randy Beckwith rpbeckwith35806@yahoo.com also reported the same bug.

[jwillemsen]

Originally posted by @jwillemsen on 2008-03-31 04:36:39 -0500 (Bugzilla comment 4)

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Steve, can you check this one?

[jwillemsen]

Originally posted by @shuston on 2009-02-04 17:05:42 -0600 (Bugzilla comment 5)

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FYI, the ACE_Process comments now state that spawn() will return 1 when avoid_zombies is used.

If the real issue is to be resolved, the grandchild has to somehow communicate to the child what the grandchild pid is. Maybe using a pipe?