getgroups(2) - NetBSD Manual Pages

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GETGROUPS(2)              NetBSD 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 indi-
     cates 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.

NetBSD 9.0                      October 7, 2006                     NetBSD 9.0