Name
getpwent, setpwent, endpwent — get password file entry
Synopsis
#include <sys/types.h> #include <pwd.h>
struct passwd *getpwent( |
void); |
void
setpwent( |
void); |
void
endpwent( |
void); |
![[Note]](../stylesheet/note.png) |
Note | ||
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DESCRIPTION
The getpwent() function
returns a pointer to a structure containing the broken-out
fields of a record from the password database (e.g., the
local password file /etc/passwd, NIS, and LDAP). The first time
it is called it returns the first entry; thereafter, it
returns successive entries.
The setpwent() function
rewinds to the beginning of the password database.
The endpwent() function is
used to close the password database after all processing has
been performed.
The passwd structure is
defined in <pwd.h> as
follows:
struct passwd { char * pw_name;char * pw_passwd;uid_t pw_uid;gid_t pw_gid;char * pw_gecos;char * pw_dir;char * pw_shell;};
RETURN VALUE
The getpwent() function
returns a pointer to a passwd
structure, or NULL if there are no more entries or an error
occurs. If an error occurs, errno is set appropriately. 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 maximum number (
OPEN_MAX) of files was open already in the calling process. - ENFILE
-
The maximum number of files was open already in the system.
- ENOMEM
-
Insufficient memory to allocate passwd 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/.
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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 Since the Linux kernel and libraries are constantly changing, this manual page may be incorrect or out-of-date.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 19:22:14 1993 by Rik Faith (faithcs.unc.edu) Modified Mon May 27 21:37:47 1996 by Martin Schulze (joeylinux.de) |