getgroups(2) [bsd man page]

GETGROUPS(2)							System Calls Manual						      GETGROUPS(2)

NAME

       getgroups - get group access list

SYNOPSIS

       #include <sys/param.h>

       ngroups = getgroups(gidsetlen, gidset)
       int ngroups, gidsetlen, *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
       number of entries that may be placed in gidset.	Getgroups returns the actual number of groups returned in gidset.  No more  than  NGROUPS,
       as defined in <sys/param.h>, will ever be returned.

RETURN VALUE

       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 getgroup 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(3X)

BUGS

       The gidset array should be of type gid_t, but remains integer for compatibility with earlier systems.

4.2 Berkeley Distribution					   May 13, 1986 						      GETGROUPS(2)

GETGROUPS(2)						      BSD System Calls Manual						      GETGROUPS(2)

NAME

     getgroups -- get group access list

SYNOPSIS

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

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					 4.2 Berkeley Distribution