4.3BSD-Reno/share/man/cat3/getgrgid.0

GETGRENT(3)		      1990		      GETGRENT(3)



NNAAMMEE
     getgrent, getgrnam, getgrgid, setgroupent, setgrfile, set-
     grent, endgrent - get group file entry

SSYYNNOOPPSSIISS
     ##iinncclluuddee <<ggrrpp..hh>>

     ssttrruucctt ggrroouupp **ggeettggrreenntt(())

     ssttrruucctt ggrroouupp **ggeettggrrnnaamm((nnaammee))
     cchhaarr **nnaammee;;

     ssttrruucctt ggrroouupp **ggeettggrrggiidd((ggiidd))
     ggiidd__tt ggiidd;;

     sseettggrroouuppeenntt((ssttaayyooppeenn))
     iinntt ssttaayyooppeenn;;

     vvooiidd sseettggrrffiillee((nnaammee))
     cchhaarr **nnaammee;;

     sseettggrreenntt(())

     vvooiidd eennddggrreenntt(())

DDEESSCCRRIIPPTTIIOONN
     _G_e_t_g_r_e_n_t, _g_e_t_g_r_g_i_d and _g_e_t_g_r_n_a_m each return a pointer to a
     structure containing the broken-out fields of a line in the
     group file.  This structure is defined by the include file
     <grp.h>, and contains the following fields:

	  struct group {
	       char	 *gr_name;	/* group name */
	       char	 *gr_passwd;	/* group password */
	       gid_t	 gr_gid;	/* group id */
	       char	 **gr_mem;	/* group members */
	  };

     These fields are more completely described in _g_r_o_u_p(5).

     _G_e_t_g_r_n_a_m and _g_e_t_g_r_g_i_d search the group database for a match-
     ing  group  name  or  group  id, respectively, returning the
     first one encountered.  Identical group names or group  gids
     may result in undefined behavior.

     _G_e_t_g_r_e_n_t  sequentially  reads  the  group	database  and  is
     intended for programs that wish to step through the complete
     list of groups.

     All three routines will open the group file for reading,  if
     necesssary.




Printed 7/27/90               June				1






GETGRENT(3)		      1990		      GETGRENT(3)



     _S_e_t_g_r_f_i_l_e changes the  default  group  file  to  _f_i_l_e,  thus
     allowing the use of alternate group files.

     _S_e_t_g_r_o_u_p_e_n_t opens the file, or rewinds it if it  is  already
     open.   If  _s_t_a_y_o_p_e_n  is non-zero, file descriptors are left
     open, significantly  speeding  up	subsequent  calls.   This
     functionality  is	unnecessary  for  _g_e_t_g_r_e_n_t  as it doesn't
     close its file descriptors by default.  It  should  also  be
     noted  that it is dangerous for long-running programs to use
     this functionality as the group file may be updated.

     _S_e_t_g_r_e_n_t is identical to _s_e_t_g_r_o_u_p_e_n_t  with  an  argument  of
     zero.

     _E_n_d_g_r_e_n_t closes any open files.

FFIILLEESS
     /etc/group

SSEEEE AALLSSOO
      getpwent(3), group(5)

DDIIAAGGNNOOSSTTIICCSS
     The routines _g_e_t_g_r_e_n_t, _g_e_t_g_r_n_a_m, and _g_e_t_g_r_g_i_d, return a null
     pointer  on EOF or error.	_S_e_t_g_r_o_u_p_e_n_t and _s_e_t_g_r_e_n_t return 0
     on failure, 1 on success.	_E_n_d_g_r_e_n_t and  _s_e_t_g_r_f_i_l_e  have  no
     return value.

BBUUGGSS
     All information is contained in a	static	buffer	which  is
     overwritten  by  each new call.  It must be copied elsewhere
     to be retained.

     The routines _g_e_t_g_r_e_n_t, _e_n_d_g_r_e_n_t, _s_e_t_g_r_o_u_p_e_n_t,  and  _s_e_t_g_r_e_n_t
     are  fairly useless in a networked environment and should be
     avoided, if possible.



















Printed 7/27/90               June				2