The Open Group Base Specifications Issue 6
IEEE Std 1003.1, 2004 Edition
Copyright © 2001-2004 The IEEE and The Open Group, All Rights reserved.

#### NAME

> getpgrp - get the process group ID of the calling process

#### SYNOPSIS

> ``#include <unistd.h>
> pid_t getpgrp(void);
> ``

#### DESCRIPTION

> The getpgrp() function shall return the process group ID of the calling process.

#### RETURN VALUE

> The getpgrp() function shall always be successful and no return value is reserved to indicate an error.

#### ERRORS

> No errors are defined.

The following sections are informative.

#### EXAMPLES

> None.

#### APPLICATION USAGE

> None.

#### RATIONALE

> 4.3 BSD provides a getpgrp() function that returns the process group ID for a specified process. Although this function supports job control, all known job control shells always specify the calling process with this function. Thus, the simpler System V getpgrp() suffices, and the added complexity of the 4.3 BSD getpgrp() is provided by the XSI extension getpgid().

#### FUTURE DIRECTIONS

> None.

#### SEE ALSO

> exec(), fork(), getpgid(), getpid(), getppid(), kill(), setpgid(), setsid(), the Base Definitions volume of IEEE Std 1003.1-2001, <sys/types.h>, <unistd.h>

#### CHANGE HISTORY

> First released in Issue 1. Derived from Issue 1 of the SVID.

#### Issue 6

> In the SYNOPSIS, the optional include of the <sys/types.h> header is removed.

> The following new requirements on POSIX implementations derive from alignment with the Single UNIX Specification:

> - The requirement to include <sys/types.h> has been removed. Although <sys/types.h> was required for conforming implementations of previous POSIX specifications, it was not required for UNIX applications.

End of informative text.

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