getpgrp (original) (raw)

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.

A newer edition of this document exists here

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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POSIX ® is a registered Trademark of The IEEE.
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