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GETGROUPS(2) UNIX Programmer's Manual GETGROUPS(2)
NNAAMMEE
ggeettggrroouuppss - get group access list
SSYYNNOOPPSSIISS
##iinncclluuddee <<ssyyss//ppaarraamm..hh>>
##iinncclluuddee <<uunniissttdd..hh>>
_i_n_t
ggeettggrroouuppss(_i_n_t _g_i_d_s_e_t_l_e_n, _i_n_t _*_g_i_d_s_e_t)
DDEESSCCRRIIPPTTIIOONN
GGeettggrroouuppss() gets the current group access list of the user process and
stores it in the array _g_i_d_s_e_t. The parameter _g_i_d_s_e_t_l_e_n indicates the num
ber of entries that may be placed in _g_i_d_s_e_t. GGeettggrroouuppss() returns the ac
tual number of groups returned in _g_i_d_s_e_t. No more than NGROUPS, as de
fined in <_s_y_s_/_p_a_r_a_m_._h>, will ever be returned.
RREETTUURRNN VVAALLUUEESS
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 _e_r_r_n_o.
EERRRROORRSS
The possible errors for ggeettggrroouuppss() are:
[EINVAL] The argument _g_i_d_s_e_t_l_e_n is smaller than the number of groups
in the group set.
[EFAULT] The argument _g_i_d_s_e_t specifies an invalid address.
SSEEEE AALLSSOO
setgroups(2), initgroups(3)
BBUUGGSS
The _g_i_d_s_e_t array should be of type _g_i_d___t _,
but remains integer for compatibility with earlier systems.
HHIISSTTOORRYY
The ggeettggrroouuppss function call appeared in 4.2BSD.
4.2 Berkeley Distribution March 10, 1991 1