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Command: getgroups | Section: 2 | Source: NetBSD | File: getgroups.2
GETGROUPS(2) FreeBSD System Calls Manual GETGROUPS(2)
NAME
getgroups - get group access list
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <unistd.h>
int
getgroups(int gidsetlen, gid_t *gidset);
DESCRIPTION
getgroups() gets the current group access list of the current user
process and stores it in the array gidset. The parameter gidsetlen
indicates the number of entries that may be placed in gidset.
getgroups() returns the actual number of groups returned in gidset. No
more than {NGROUPS_MAX} will ever be returned. If gidsetlen is 0,
getgroups() returns the number of groups without modifying the gidset
array.
This system call only returns the secondary groups.
RETURN VALUES
A successful call returns the number of groups in the group set. A value
of -1 indicates that an error occurred, and the error code is stored in
the global variable errno.
ERRORS
The possible errors for getgroups() are:
[EINVAL] The argument gidsetlen is non-zero and is smaller than
the number of groups in the group set.
[EFAULT] The argument gidset specifies an invalid address.
SEE ALSO
getegid(2), getgid(2), setgroups(2), initgroups(3)
STANDARDS
The getgroups() function conforms to IEEE Std 1003.1-1990 ("POSIX.1").
HISTORY
The getgroups() function call appeared in 4.2BSD.
FreeBSD 14.1-RELEASE-p8 October 7, 2006 FreeBSD 14.1-RELEASE-p8