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); |
![[Note]](../stylesheet/note.png) |
Note | ||
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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;char * gr_passwd;gid_t gr_gid;char ** gr_mem;};
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.
COLOPHON
This page is part of release 2.79 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) Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies. Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim copying, provided that the entire resulting derived work is distributed under the terms of a permission notice identical to this one. Since the Linux kernel and libraries are constantly changing, this manual page may be incorrect or out-of-date. The author(s) assume no responsibility for errors or omissions, or for damages resulting from the use of the information contained herein. The author(s) may not have taken the same level of care in the production of this manual, which is licensed free of charge, as they might when working professionally. Formatted or processed versions of this manual, if unaccompanied by the source, must acknowledge the copyright and authors of this work. References consulted: Linux libc source code Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991) 386BSD man pages Modified Sat Jul 24 19:29:54 1993 by Rik Faith (faithcs.unc.edu) |