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GETGROUPS(2)                BSD Programmer's Manual               GETGROUPS(2)

NAME
     getgroups - get group access list

SYNOPSIS
     #include <&lt;sys/param.h>&gt;
     #include <&lt;unistd.h>&gt;

     int
     getgroups(int gidsetlen, gid_t *gidset);

DESCRIPTION
     Getgroups() gets the current group access list of the user process and
     stores it in the array gidset. The parameter gidsetlen indicates the num-
     ber of entries that may be placed in gidset. Getgroups() returns the ac-
     tual number of groups returned in gidset. No more than NGROUPS, as de-
     fined 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 ALSO
     setgroups(2),  initgroups(3)

HISTORY
     The getgroups function call appeared in 4.2BSD.

4.2 Berkeley Distribution       April 16, 1994                               1