GETGRENT(3)

NAME
getgrent, getgrgid, getgrnam, setgrent, endgrent, fgetgrent - get group file entry

SYNOPSIS
#include <grp.h>

struct group *getgrent()

struct group *getgrgid(gid)
int gid;

struct group *getgrnam(name)
char *name;

setgrent()

endgrent()

struct group *fgetgrent()
FILE *f;

DESCRIPTION
Getgrent, getgrgid and getgrnam each return pointers to an object with the following structure containing the broken-out fields of a line in the group file.

The members of this structure are:

gr_name
    The name of the group.

gr_passwd
    The encrypted password of the group.

gr_gid
    The numerical group-ID.

gr_mem
    Null-terminated vector of pointers to the individual member names.

Getgrent simply reads the next line while getgrgid and getgrnam search until a matching gid or name is found (or until EOF is encountered). Each routine picks up where the others leave off so successive calls may be used to search the entire file.

A call to setgrent has the effect of rewinding the group file to allow repeated searches. Endgrent may be called to close the group file when processing is complete.

Fgetgrent returns a pointer to the next group structure in the stream f, which must refer to an open file in the same format as the group file /etc/group.

FILES
/etc/group

SEE ALSO
getlogin(3), getpwent(3), group(5), ypserv(8)

DIAGNOSTICS
A null pointer (0) is returned on EOF or error.

BUGS
All information is contained in a static area so it must be copied if it is to be saved.