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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-24 04:52:22 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-24 04:52:22 +0000
commit3d08cd331c1adcf0d917392f7e527b3f00511748 (patch)
tree312f0d1e1632f48862f044b8bb87e602dcffb5f9 /man3/getpwent.3
parentAdding debian version 6.7-2. (diff)
downloadmanpages-3d08cd331c1adcf0d917392f7e527b3f00511748.tar.xz
manpages-3d08cd331c1adcf0d917392f7e527b3f00511748.zip
Merging upstream version 6.8.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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-'\" t
-.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" 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 (faith@cs.unc.edu)
-.\" Modified Mon May 27 21:37:47 1996 by Martin Schulze (joey@linux.de)
-.\"
-.TH getpwent 3 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-getpwent, setpwent, endpwent \- get password file entry
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <sys/types.h>
-.B #include <pwd.h>
-.P
-.B struct passwd *getpwent(void);
-.B void setpwent(void);
-.B void endpwent(void);
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR getpwent (),
-.BR setpwent (),
-.BR endpwent ():
-.nf
- _XOPEN_SOURCE >= 500
-.\" || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
- || /* glibc >= 2.19: */ _DEFAULT_SOURCE
- || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
-.fi
-.SH DESCRIPTION
-The
-.BR 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
-.IR /etc/passwd ,
-NIS, and LDAP).
-The first time
-.BR getpwent ()
-is called, it returns the first entry; thereafter, it returns successive
-entries.
-.P
-The
-.BR setpwent ()
-function rewinds to the beginning
-of the password database.
-.P
-The
-.BR endpwent ()
-function is used to close the password database
-after all processing has been performed.
-.P
-The \fIpasswd\fP structure is defined in \fI<pwd.h>\fP as follows:
-.P
-.in +4n
-.EX
-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; /* user information */
- char *pw_dir; /* home directory */
- char *pw_shell; /* shell program */
-};
-.EE
-.in
-.P
-For more information about the fields of this structure, see
-.BR passwd (5).
-.SH RETURN VALUE
-The
-.BR getpwent ()
-function returns a pointer to a
-.I passwd
-structure, or NULL if
-there are no more entries or an error occurred.
-If an error occurs,
-.I errno
-is set to indicate the error.
-If one wants to check
-.I errno
-after the call, it should be set to zero before the call.
-.P
-The return value may point to a static area, and may be overwritten
-by subsequent calls to
-.BR getpwent (),
-.BR getpwnam (3),
-or
-.BR getpwuid (3).
-(Do not pass the returned pointer to
-.BR free (3).)
-.SH ERRORS
-.TP
-.B EINTR
-A signal was caught; see
-.BR signal (7).
-.TP
-.B EIO
-I/O error.
-.TP
-.B EMFILE
-The per-process limit on the number of open file descriptors has been reached.
-.TP
-.B ENFILE
-The system-wide limit on the total number of open files has been reached.
-.TP
-.B ENOMEM
-.\" not in POSIX
-Insufficient memory to allocate
-.I passwd
-structure.
-.\" to allocate the passwd structure, or to allocate buffers
-.TP
-.B ERANGE
-Insufficient buffer space supplied.
-.SH FILES
-.TP
-.I /etc/passwd
-local password database file
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lb lb lbx
-l l l.
-Interface Attribute Value
-T{
-.na
-.nh
-.BR getpwent ()
-T} Thread safety T{
-.na
-.nh
-MT-Unsafe race:pwent
-race:pwentbuf locale
-T}
-T{
-.na
-.nh
-.BR setpwent (),
-.BR endpwent ()
-T} Thread safety T{
-.na
-.nh
-MT-Unsafe race:pwent locale
-T}
-.TE
-.P
-In the above table,
-.I pwent
-in
-.I race:pwent
-signifies that if any of the functions
-.BR setpwent (),
-.BR getpwent (),
-or
-.BR endpwent ()
-are used in parallel in different threads of a program,
-then data races could occur.
-.SH VERSIONS
-The
-.I pw_gecos
-field is not specified in POSIX, but is present on most implementations.
-.SH STANDARDS
-POSIX.1-2008.
-.SH HISTORY
-POSIX.1-2001, SVr4, 4.3BSD.
-.SH SEE ALSO
-.BR fgetpwent (3),
-.BR getpw (3),
-.BR getpwent_r (3),
-.BR getpwnam (3),
-.BR getpwuid (3),
-.BR putpwent (3),
-.BR passwd (5)