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NAME    [Toc]    [Back]

     getgroups - get group access list

SYNOPSIS    [Toc]    [Back]

     #include <sys/types.h>
     #include <unistd.h>

     getgroups(int gidsetlen, gid_t *gidset);

DESCRIPTION    [Toc]    [Back]

     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.
     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    [Toc]    [Back]

     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    [Toc]    [Back]

     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    [Toc]    [Back]

     getegid(2), setgid(2), setgroups(2), initgroups(3)

HISTORY    [Toc]    [Back]

     The getgroups() function call appeared in 4.2BSD.

OpenBSD     3.6                          April      16,      1994
[ Back ]
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