NAME
getgroups —
get group access list
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.
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 ALSO
STANDARDS
The getgroups() function conforms to
IEEE Std 1003.1-2008 (“POSIX.1”).
HISTORY
The getgroups() system call first appeared
in 4.1cBSD.