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NetBSD 6.1.5 - man page for getgroups (netbsd section 2)

GETGROUPS(2)			     BSD 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 ISO/IEC 9945-1:1990 (``POSIX.1'').

HISTORY
     The getgroups() function call appeared in 4.2BSD.

BSD					 October 7, 2006				      BSD


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