PROLOG

       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.

NAME

       utmpx.h — user accounting database definitions

SYNOPSIS

       #include <utmpx.h>

DESCRIPTION

       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 in <sys/time.h>.

       Inclusion of the <utmpx.h> header may also make visible all symbols from <sys/time.h>.

       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.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       <sys_time.h>, <sys_types.h>

       The System Interfaces volume of POSIX.1‐2008, endutxent()

COPYRIGHT

       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 https://www.kernel.org/doc/man-pages/reporting_bugs.html .