Linux manual pages Section 3: Subroutines  

Name

fgetgrent — get group file entry

Synopsis

#include <stdio.h>
#include <sys/types.h>
#include <grp.h>
struct group *fgetgrent( FILE *stream);
 
[Note] Note
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
fgetgrent():
_SVID_SOURCE

DESCRIPTION

The fgetgrent() function returns a pointer to a structure containing the group information from the file referred to by stream. The first time it is called it returns the first entry; thereafter, it returns successive entries. The file referred to by stream must have the same format as /etc/group (see group(5)).

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 fgetgrent() function returns a pointer to a group structure, or NULL if there are no more entries or an error occurs. In the event of an error, errno is set to indicate the cause.

ERRORS

ENOMEM

Insufficient memory to allocate group structure.

CONFORMING TO

SVr4.

SEE ALSO

endgrent(3), fgetgrent_r(3), fopen(3), getgrent(3), getgrgid(3), getgrnam(3), putgrent(3), setgrent(3), group(5)

COLOPHON

This page is part of release 3.52 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man−pages/.


  Copyright 1993 David Metcalfe (davidprism.demon.co.uk)

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References consulted:
    Linux libc source code
    Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
    386BSD man pages
Modified Sat Jul 24 19:38:44 1993 by Rik Faith (faithcs.unc.edu)