utmpx.h - user accounting database definitions
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 pid_t type shall be defined through typedef as described in
The timeval structure shall be defined as described in <sys/time.h> .
Inclusion of the <utmpx.h> header may also make visible all symbols
The following symbolic constants shall be defined as possible values
for the ut_type member of the utmpx structure:
EMPTY No valid user accounting information.
Identifies time of system boot.
Identifies time when system clock changed.
Identifies time after system clock changed.
Identifies a process.
Identifies a process spawned by the init process.
Identifies the session leader of a logged-in user.
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.
struct utmpx *getutxent(void);
struct utmpx *getutxid(const struct utmpx *);
struct utmpx *getutxline(const struct utmpx *);
struct utmpx *pututxline(const struct utmpx *);
The following sections are informative.
<sys/time.h> , <sys/types.h> , the System Interfaces volume of
IEEE Std 1003.1-2001, endutxent()
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group. 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.opengroup.org/unix/online.html .