GETGROUPS(2) BSD System Calls Manual GETGROUPS(2)NAMEgetgroups — get group access list
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <sys/types.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_MAX
will ever be returned. If gidsetlen is zero, getgroups() returns the
number of supplementary group IDs associated with the calling process
without modifying the array pointed to by gidset.
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.
BSD March 5, 1999 BSD