GETGROUPS(2) BSD System Calls Manual GETGROUPS(2)NAMEgetgroups — get group access list
SYNOPSIS
#include <sys/param.h>
#include <unistd.h>
int
getgroups(int gidsetlen, gid_t *gidset);
DESCRIPTIONGetgroups() gets the current group access list of the 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, as
defined in ⟨sys/param.h⟩, will ever be returned.
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 smaller than the number of
groups in the group set.
[EFAULT] The argument gidset specifies an invalid address.
SEE ALSOsetgroups(2), initgroups(3)HISTORY
The getgroups function call appeared in 4.2BSD.
4.2 Berkeley Distribution April 16, 1994 4.2 Berkeley Distribution