utmpx.h (0p)

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()

Information

Source
POSIX
OS/version
IEEE/The Open Group
Source updated
January 1, 2013
Page created
March 3, 2018
Page generated
March 4, 2018