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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "GETPGID" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" getpgid 
+.SH NAME
+getpgid \- get the process group ID for a process
+.SH SYNOPSIS
+.LP
+\fB#include <unistd.h>
+.br
+.sp
+pid_t getpgid(pid_t\fP \fIpid\fP\fB); \fP
+\fB
+.br
+\fP
+.SH DESCRIPTION
+.LP
+The \fIgetpgid\fP() function shall return the process group ID of
+the process whose process ID is equal to \fIpid\fP. If
+\fIpid\fP is equal to 0, \fIgetpgid\fP() shall return the process
+group ID of the calling process.
+.SH RETURN VALUE
+.LP
+Upon successful completion, \fIgetpgid\fP() shall return a process
+group ID. Otherwise, it shall return (\fBpid_t\fP)-1 and
+set \fIerrno\fP to indicate the error.
+.SH ERRORS
+.LP
+The \fIgetpgid\fP() function shall fail if:
+.TP 7
+.B EPERM
+The process whose process ID is equal to \fIpid\fP 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.
+.TP 7
+.B ESRCH
+There is no process with a process ID equal to \fIpid\fP.
+.sp
+.LP
+The \fIgetpgid\fP() function may fail if:
+.TP 7
+.B EINVAL
+The value of the \fIpid\fP argument is invalid.
+.sp
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+None.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIexec\fP() , \fIfork\fP() , \fIgetpgrp\fP() , \fIgetpid\fP() , \fIgetsid\fP()
+, \fIsetpgid\fP() , \fIsetsid\fP() , the Base Definitions volume of
+IEEE\ Std\ 1003.1-2001, \fI<unistd.h>\fP
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
+-- 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 .