Does strace support capturing session ID and process group ID?

[Eugene Syromyatnikov]

On Tue, Mar 14, 2017 at 4:42 PM, Leixiang Wu <leixiang.wu at stonybrook.edu> wrote:
> Hi,
>
> I am using strace to capture system call traces of a program. I would like
> to capture session ID and process group ID. Is this possible in strace? I
> looked the man page. It doens't say anything about those two process state
> information.
As strace is a system call tracer, this functionality is quite out of
its scope[1]. One can get this information from /proc/${pid}/stat, as
proc(5) suggests:

       /proc/[pid]/stat
              Status  information  about  the  process.  This is used
by ps(1).  It is defined in the kernel
              source file fs/proc/array.c.

              The fields, in order, with their proper scanf(3) format
specifiers, are listed below.  Whether
              or  not  certain of these fields display valid
information is governed by a ptrace access mode
              PTRACE_MODE_READ_FSCREDS | PTRACE_MODE_NOAUDIT check
(refer  to  ptrace(2)).   If  the  check
              denies access, then the field value is displayed as 0.
The affected fields are indicated with
              the marking [PT].

<...>

              (5) pgrp  %d
                        The process group ID of the process.

              (6) session  %d
                        The session ID of the process.

[1] You can, however, try to capture setpgid/getpgid and setsid/getsid
syscalls, in case you are sure tracee calls these.

> Best,
> Leixiang Wu
>
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-- 
Eugene Syromyatnikov
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