The Open Group Base Specifications Issue 7, 2018 edition
IEEE Std 1003.1-2017 (Revision of IEEE Std 1003.1-2008)
Copyright © 2001-2018 IEEE and The Open Group

NAME

getgid - get the real group ID

SYNOPSIS

#include <unistd.h>

gid_t getgid(void);

DESCRIPTION

The getgid() function shall return the real group ID of the calling process. The getgid() function shall not modify errno.

RETURN VALUE

The getgid() 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

In a conforming environment, getgid() will always succeed. It is possible for implementations to provide an extension where a process in a non-conforming environment will not be associated with a user or group ID. It is recommended that such implementations return (gid_t)-1 and set errno to indicate such an environment; doing so does not violate this standard, since such an environment is already an extension.

FUTURE DIRECTIONS

None.

SEE ALSO

getegid, geteuid, getuid, setegid, seteuid, setgid, setregid, setreuid, setuid

XBD <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:

Issue 7

POSIX.1-2008, Technical Corrigendum 2, XSH/TC2-2008/0159 [511] is applied.

End of informative text.

 

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