[ast-developers] ksh process group problem

[Brian Ginn]

I am seeing an intermittent problem on Red Hat Enterprise Linux 5.4 and 5.6, 
and HP-UX 11.0 and 11.31.
The processes launched from the AST ksh sometimes "own" the terminal, and 
sometimes don't.


Output from the test program below demonstrates the issue:


[fbg@sturgeon ~]$ /opt/ast/bin/ksh

$ /tmp/testprocessgroup_linux64

PID: 8678  MY_pgrp=8678 STDIN_PGRP:8674 --DO NOT own terminal

$ /tmp/testprocessgroup_linux64

PID: 8679  MY_pgrp=8679 STDIN_PGRP:8679 --own terminal

$ /tmp/testprocessgroup_linux64

PID: 8680  MY_pgrp=8680 STDIN_PGRP:8680 --own terminal

$ /tmp/testprocessgroup_linux64

PID: 8681  MY_pgrp=8681 STDIN_PGRP:8681 --own terminal

$ /tmp/testprocessgroup_linux64

PID: 8682  MY_pgrp=8682 STDIN_PGRP:8674 --DO NOT own terminal

$ /tmp/testprocessgroup_linux64

PID: 8683  MY_pgrp=8683 STDIN_PGRP:8683 --own terminal

$ /tmp/testprocessgroup_linux64

PID: 8684  MY_pgrp=8684 STDIN_PGRP:8674 --DO NOT own terminal

$




[fbg@sturgeon pgrp]$ cat testprocessgroup.c
#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/stat.h>
#include <fcntl.h>

int main(int argc, char **argv)
{
    int devtty;


    printf("PID:%5lu  MY_pgrp=%d STDIN_PGRP:%d --%s\n",
               getpid(),
               getpgid(getpid()),
               tcgetpgrp(fileno(stdin)),
               tcgetpgrp(fileno(stdin)) == getpgid(getpid()) ? "own terminal" : 
"DO NOT own terminal" );


    return(0);
}

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