GETPGID(P) POSIX Programmer's Manual GETPGID(P)
getpgid - get the process group ID for a process
pid_t getpgid(pid_t pid);
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.
Upon successful completion, getpgid() shall return a process group ID. Otherwise, it shall return (pid_t)-1 and set errno to indicate the
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.
exec() , fork() , getpgrp() , getpid() , getsid() , setpgid() , setsid() , the Base Definitions volume of IEEE Std 1003.1-2001, <unistd.h>
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE
and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained
online at http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 GETPGID(P)