SYNOPSIS

     use Pipe::Find qw(find_pipe_processes get_stdout_pipe_process);
     $procs = find_pipe_processes(); # hashref, key=fd, value=process info hash
    
     if ($res->{0}) {
         say "STDIN is connected to a pipe";
         say "pid=$procs->{0}{pid}";
         say "cmdline=$procs->[0]{cmdline}";
         say "exe=$procs->[0]{exe}";
     }
     if ($res->{1}) {
         say "STDOUT is connected to a pipe";
         ...
     }
     if ($res->{3}) {
         say "STDERR is connected to a pipe";
         ...
     }
     # ...

DESCRIPTION

FUNCTIONS

    None exported by default, but they are exportable.

 find_pipe_processes([ $pid ]) => \%procs

    List all processes behind the pipes that your process opens. (You can
    also find pipes for another process by passing its PID.)

    Currently only works on Linux. Works by listing /proc/$$/fd and
    selecting all fd's that symlinks to pipe:*. Then it will list all
    /proc/*/fd and find matching pipes.

    STDIN pipe is at fd 0, STDOUT pipe at fd 1, STDERR at fd 2.

 get_stdin_pipe_process() => \%procinfo

    Basically a shortcut to get the fd 0 only, since this is common. Return
    undef if STDIN is not piped.

    If you plan on getting process information for both STDIN and STDOUT,
    it's better to use find_pipe_processes() than calling this function and
    get_stdout_pipe_process(), because the latter will scan twice.

 get_stdout_pipe_process() => \%procinfo

    Basically a shortcut to get the fd 1 only, since this is common. Return
    undef if STDOUT is not piped.

    If you plan on getting process information for both STDIN and STDOUT,
    it's better to use find_pipe_processes() than calling this function and
    get_stdin_pipe_process(), because the latter will scan twice.

SEE ALSO

