endgrent

GETGRENT(3)		  Linux Programmer’s Manual		  GETGRENT(3)



NAME
       getgrent, setgrent, endgrent - get group file entry

SYNOPSIS
       #include <sys/types.h>
       #include <grp.h>

       struct group *getgrent(void);

       void setgrent(void);

       void endgrent(void);

DESCRIPTION
       The  getgrent()	function  returns a pointer to a structure containing
       the group information from /etc/group.  The first time it is called it
       returns the first entry; thereafter, it returns successive entries.

       The  setgrent()	function rewinds the file pointer to the beginning of
       the /etc/group file.

       The endgrent() function closes the /etc/group file.

       The group structure is defined in <grp.h> as follows:

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

RETURN VALUE
       The getgrent() function returns the group  information  structure,  or
       NULL if there are no more entries or an error occurs.

       Upon  error,  errno may be set. If you want to check its value, set it
       to zero before the call.

ERRORS
       EINTR  A signal was caught.

       EIO    I/O error.

       EMFILE The calling process already has too many open files.

       ENFILE Too many open files in the system.

       ENOMEM Insufficient memory to allocate group information structure.

FILES
       /etc/group
	       group database file

CONFORMING TO
       SVID 3, BSD 4.3, POSIX 1003.1-2003.

SEE ALSO
       fgetgrent(3), getgrent_r(3), getgrgid(3), getgrnam(3),



				  1993-04-04			  GETGRENT(3)