GETEGID
Section: POSIX Programmer's Manual (3P)
Updated: 2017
Page Index
PROLOG
This manual page is part of the POSIX Programmer's Manual.
The Linux implementation of this interface may differ (consult
the corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.
NAME
getegid
--- get the effective group ID
SYNOPSIS
#include <unistd.h>
gid_t getegid(void);
DESCRIPTION
The
getegid()
function shall return the effective group ID of the calling process.
The
getegid()
function shall not modify
errno.
RETURN VALUE
The
getegid()
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,
getegid()
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
geteuid(),
getgid(),
getuid(),
setegid(),
seteuid(),
setgid(),
setregid(),
setreuid(),
setuid()
The Base Definitions volume of POSIX.1-2017,
<sys_types.h>,
<unistd.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1-2017, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 7, 2018 Edition,
Copyright (C) 2018 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 .
Any typographical or formatting errors that appear
in this page are most likely
to have been introduced during the conversion of the source files to
man page format. To report such errors, see
https://www.kernel.org/doc/man-pages/reporting_bugs.html .