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)

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SETGROUPS(2)						      BSD System Calls Manual						      SETGROUPS(2)

NAME

     setgroups -- set group access list

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

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

     int
     setgroups(int ngroups, const gid_t *gidset);

DESCRIPTION

     setgroups() sets the group access list of the current user process according to the array gidset.	The parameter ngroups indicates the number
     of entries in the array and must be no more than {NGROUPS_MAX}.

     Only the super-user may set new groups.

     This system call affects only secondary groups.

RETURN VALUES

     A 0 value is returned on success, -1 on error, with an error code stored in errno.

ERRORS

     The setgroups() call will fail if:

     [EINVAL]		The value of ngroups is greater than {NGROUPS_MAX}.

     [EPERM]		The caller is not the super-user.

     [EFAULT]		The address specified for gidset is outside the process address space.

SEE ALSO

     getgroups(2), setegid(2), setgid(2), setregid(2), initgroups(3)

HISTORY

     The setgroups() function call appeared in 4.2BSD.

BSD
								  October 7, 2006							       BSD

Linux and UNIX Man Pages

getgroups(2) [bsd man page]

Check Out this Related Man Page