getpgid man page

Prolog

This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

getpgid — get the process group ID for a process

Synopsis

#include <unistd.h>

pid_t getpgid(pid_t pid);

Description

The getpgid() function shall return the process group ID of the process whose process ID is equal to pid. If pid is equal to 0, getpgid() shall return the process group ID of the calling process.

Return Value

Upon successful completion, getpgid() shall return a process group ID. Otherwise, it shall return (pid_t)-1 and set errno to indicate the error.

Errors

The getpgid() function shall fail if:

EPERM
The process whose process ID is equal to pid is not in the same session as the calling process, and the implementation does not allow access to the process group ID of that process from the calling process.
ESRCH
There is no process with a process ID equal to pid.

The getpgid() function may fail if:

EINVAL
The value of the pid argument is invalid.

The following sections are informative.

See Also

exec, fork(), getpgrp(), getpid(), getsid(), setpgid(), setsid()

The Base Definitions volume of POSIX.1‐2008, <unistd.h>

Info

2013 IEEE/The Open Group POSIX Programmer's Manual