logout man page on CentOS

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LOGIN(3)		  Linux System Administration		      LOGIN(3)

NAME
       login, logout - write utmp and wtmp entries

SYNOPSIS
       #include <utmp.h>

       void login(const struct utmp *ut);
       int logout(const char *ut_line);

DESCRIPTION
       The utmp file records who is currently using the system.	 The wtmp file
       records all logins and logouts. See utmp(5).

       The function login() takes the supplied struct utmp ut, and  writes  it
       to both utmp and wtmp file.

       The function logout() clears the entry in the utmp file again.

GNU DETAILS
       More  precisely,	 login() takes the argument ut struct, fills the field
       ut->ut_type (if there is such a field) with the value USER_PROCESS, and
       fills  the field ut->ut_pid (if there is such a field) with the process
       ID  of  the  calling  process.	Then  it  tries	 to  fill  the	 field
       ut->ut_line.   It  takes	 the  first of stdin, stdout, stderr that is a
       tty, and stores the corresponding pathname  minus  a  possible  leading
       /dev/ into this field, and then writes the struct to the utmp file.  On
       the other hand, if no tty name was found, this  field  is  filled  with
       "???"  and the struct is not written to the utmp file.  After this, the
       struct is written to the wtmp file.

       The logout() function searches the utmp file for an entry matching  the
       ut_line	argument.  If  a record is found, it is updated by zeroing out
       the ut_name and ut_host fields, updating the ut_tv timestamp field  and
       setting ut_type (if there is such a field) to DEAD_PROCESS.

RETURN VALUES
       The  logout()  function returns 1 if the entry was successfully written
       to the database, or 0 if an error occurred.

NOTE
       These functions are included in	libutil,  hence	 you'll	 need  to  add
       -lutil to your compiler command line.

       Note  that  the member ut_user of struct utmp is called ut_name in BSD.
       Therefore, ut_name is defined as an alias for ut_user in <utmp.h>.

FILES
       /var/run/utmp
	      user  accounting	database,  configured  through	_PATH_UTMP  in
	      <paths.h>

       /var/log/wtmp
	      user  accounting	log  file,  configured	through	 _PATH_WTMP in
	      <paths.h>

CONFORMING TO
       Not in POSIX.1-2001.  Present on the BSDs.

SEE ALSO
       getutent(3), utmp(5)

GNU/Linux			  2004-05-06			      LOGIN(3)
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