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GETPWENT
Section: Linux Programmer's Manual (3)
Updated: 2010-09-20
Index
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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);
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
getpwent(),
setpwent(),
endpwent():
-
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 500 ||
_XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
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
getpwent()
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; /* username */
char *pw_passwd; /* user password */
uid_t pw_uid; /* user ID */
gid_t pw_gid; /* group ID */
char *pw_gecos; /* real name */
char *pw_dir; /* home directory */
char *pw_shell; /* shell program */
};
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.
The return value may point to a static area, and may be overwritten
by subsequent calls to
getpwent(),
getpwnam(3),
or
getpwuid(3).
(Do not pass the returned pointer to
free(3).)
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.
FILES
- /etc/passwd
-
local password database file
CONFORMING TO
SVr4, 4.3BSD, POSIX.1-2001.
SEE ALSO
fgetpwent(3),
getpw(3),
getpwent_r(3),
getpwnam(3),
getpwuid(3),
putpwent(3),
passwd(5)
COLOPHON
This page is part of release 3.27 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/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- FILES
-
- CONFORMING TO
-
- SEE ALSO
-
- COLOPHON
-
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