endgrent man page on CentOS

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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
       broken-out fields of a record in the group database  (e.g.,  the	 local
       group  file /etc/group, NIS, and LDAP).	The first time it is called it
       returns the first entry; thereafter, it returns successive entries.

       The setgrent() function rewinds to the beginning of the group database,
       to allow repeated scans.

       The  endgrent()	function is used to close the group database after all
       processing has been performed.

       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 a pointer to a group structure, or NULL
       if there are no more entries or an error occurs.

       Upon  error,  errno  may be set.	 If one wants to check errno after the
       call, it should be set 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.

       ERANGE Insufficient buffer space supplied.

FILES
       /etc/group
	      local group database file

CONFORMING TO
       SVr4, 4.3BSD, POSIX.1-2001.

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

				  1993-04-04			   GETGRENT(3)
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