utmpx.h man page


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 — user accounting database definitions


#include <utmpx.h>


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:

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.

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.

See Also

<sys_time.h>, <sys_types.h>

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


2013 IEEE/The Open Group POSIX Programmer's Manual