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From: Ken Brown <kbrown AT cornell DOT edu>
To: "cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Subject: Re: Can't debug bash with gdb 8.2.1-1
Date: Wed, 24 Jul 2019 14:32:40 +0000
Message-ID: <69e822c7-d02c-170c-9fed-c0972df16438@cornell.edu>
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On 7/24/2019 8:33 AM, Ken Brown wrote:
> $ cat getpgrp_test.c
> #include <unistd.h>
> #include <stdio.h>
> #include <errno.h>
> 
> int
> main ()
> {
>     pid_t pid = getpid ();
>     pid_t pgid = getpgid (0);
>     printf ("getpid () = %d, getpgid (0) = %d, errno = %d\n", pid, pgid, errno);
> }
> 
> $ gcc -o getpgrp_test -Wall -g -O0 getpgrp_test.c
> 
> $ ./getpgrp_test.exe
> getpid () = 1424, getpgid (0) = 1424, errno = 0
> 
> $ gdb ./getpgrp_test.exe
> GNU gdb (GDB) (Cygwin 8.2.1-1) 8.2.1
> [...]
> (gdb) r
> Starting program: /home/kbrown/Documents/programming/misc_examples/getpgrp_test.exe
> [...]
> getpid () = 1427, getpgid (0) = -1, errno = 0
> [...]
> [Inferior 1 (process 23872) exited normally]
> 
> So getpgid (0) returns -1 without setting errno.  I think this means that
> pinfo::init() didn't fail, but for some reason myself->pgid == -1.

I just ran the above gdb session under strace and found several lines like this:

    25 32828861 [main] gdb 1799 tcsetpgrp: 0 = tcsetpgrp(0, -1)

I haven't looked at the gdb code, but doesn't this mean that gdb is trying to 
set pgrp to -1?  If so, why?  And shouldn't tcsetpgrp return -1 with EINVAL?

Ken

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