utmpx.h man page

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.

utmpx.h ā€” 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()

Referenced By

endutxent(3p).

2013 IEEE/The Open Group POSIX Programmer's Manual