This manual page is part of the POSIX Programmer's Manual. The Linux
implementation of this interface may differ (consult the
corresponding Linux manual page for details of Linux behavior), or
the interface may not be implemented on Linux.
The <utmpx.h> header shall define the utmpx structure that shall
include at least the following members:
char ut_user User login name.
char ut_id Unspecified initialization process identifier.
char ut_line Device name.
pid_t ut_pid Process ID.
short ut_type Type of entry.
struct timeval ut_tv Time entry was made.
The <utmpx.h> header shall define the pid_t type through typedef, as
described in <sys/types.h>.
The <utmpx.h> header shall define the timeval structure as described
Inclusion of the <utmpx.h> header may also make visible all symbols
The <utmpx.h> header shall define the following symbolic constants as
possible values for the ut_type member of the utmpx structure:
EMPTY No valid user accounting information.
BOOT_TIME Identifies time of system boot.
OLD_TIME Identifies time when system clock changed.
NEW_TIME Identifies time after system clock changed.
USER_PROCESS Identifies a process.
INIT_PROCESS Identifies a process spawned by the init process.
LOGIN_PROCESS Identifies the session leader of a logged-in user.
DEAD_PROCESS Identifies a session leader who has exited.
The following shall be declared as functions and may also be defined
as macros. Function prototypes shall be provided.
void endutxent(void);struct utmpx *getutxent(void);struct utmpx *getutxid(const struct utmpx *);struct utmpx *getutxline(const struct utmpx *);struct utmpx *pututxline(const struct utmpx *);void setutxent(void);The following sections are informative.
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2013 Edition, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The Open
Group Base Specifications Issue 7, Copyright (C) 2013 by the
Institute of Electrical and Electronics Engineers, Inc and The Open
Group. (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1
applied.) In the event of any discrepancy between this version and
the original IEEE and The Open Group Standard, the original IEEE and
The Open Group Standard is the referee document. The original
Standard can be obtained online at http://www.unix.org/online.html .
Any typographical or formatting errors that appear in this page are
most likely to have been introduced during the conversion of the
source files to man page format. To report such errors, see
IEEE/The Open Group 2013 utmpx.h(0P)