redhat man page for getgrent

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

NAME
       getgrent, setgrent, endgrent - get group file entry

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

ERRORS
       ENOMEM Insufficient memory to allocate group information structure.

FILES
       /etc/group
	       group database file

CONFORMING TO
       SVID 3, BSD 4.3

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

GNU
								    1993-04-04							       GETGRENT(3)