This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface

       The sizes of the arrays in the structure can be found using the sizeof operator.

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard
       for  Information  Technology  --  Portable  Operating  System  Interface  (POSIX),  The  Open  Group Base
       Specifications Issue 7, 2018 Edition, Copyright (C) 2018 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 .

       Any typographical or formatting errors that appear in this page are most likely to have  been  introduced
       during   the   conversion  of  the  source  files  to  man  page  format.  To  report  such  errors,  see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group                                   2017                                     ENDUTXENT(3POSIX)

       These functions shall provide access to the user accounting database.

       The getutxent() function shall read the next entry from the user accounting database.  If the database is
       not already open, it shall open it. If it reaches the end of the database, it shall fail.

       The  getutxid()  function  shall  search  forward from the current point in the database.  If the ut_type
       value of the utmpx structure pointed to by id is BOOT_TIME, OLD_TIME, or NEW_TIME,  then  it  shall  stop
       when  it  finds  an  entry  with  a  matching  ut_type  value.  If  the  ut_type  value  is INIT_PROCESS,
       LOGIN_PROCESS, USER_PROCESS, or DEAD_PROCESS, then it shall stop when it finds an entry whose type is one
       of these four and whose ut_id member matches the ut_id member of the utmpx structure pointed  to  by  id.
       If the end of the database is reached without a match, getutxid() shall fail.

       The  getutxline()  function shall search forward from the current point in the database until it finds an
       entry of the type LOGIN_PROCESS or USER_PROCESS which also has a ut_line value matching that in the utmpx
       structure pointed to by line.  If the end of the database is reached without a match, getutxline()  shall
       fail.

       The  getutxid()  or  getutxline() function may cache data. For this reason, to use getutxline() to search
       for multiple occurrences, the application  shall  zero  out  the  static  data  after  each  success,  or
       getutxline() may return a pointer to the same utmpx structure.

       There  is  one  exception  to  the  rule  about clearing the structure before further reads are done. The
       implicit read done by pututxline() (if it finds that it is not already at the correct place in  the  user
       accounting  database)  shall  not  modify  the  static  structure returned by getutxent(), getutxid(), or
       getutxline(), if the application has modified this structure and passed the pointer back to pututxline().

       For all entries that match a request, the ut_type member indicates the type of the entry.  Other  members
       of the entry shall contain meaningful data based on the value of the ut_type member as follows:
                 ┌────────────────┬─────────────────────────────────────────────────────────────────┐
                 │ ut_typeMember │               OtherMemberswithMeaningfulData                │
                 ├────────────────┼─────────────────────────────────────────────────────────────────┤
                 │ EMPTY          │ No others                                                       │
                 │ BOOT_TIME      │ ut_tv                                                           │
                 │ OLD_TIME       │ ut_tv                                                           │
                 │ NEW_TIME       │ ut_tv                                                           │
                 │ USER_PROCESS   │ ut_id, ut_user (login name of the user), ut_line, ut_pid, ut_tv │
                 │ INIT_PROCESS   │ ut_id, ut_pid, ut_tv                                            │
                 │ LOGIN_PROCESS  │ ut_id,   ut_user  (implementation-defined  name  of  the  login │
                 │                │ process), ut_line, ut_pid, ut_tv                                │
                 │ DEAD_PROCESS   │ ut_id, ut_pid, ut_tv                                            │
                 └────────────────┴─────────────────────────────────────────────────────────────────┘

       An implementation that provides extended security controls may impose implementation-defined restrictions
       on accessing the user accounting database. In particular, the system may deny the existence  of  some  or
       all of the user accounting database entries associated with users other than the caller.

       If  the  process has appropriate privileges, the pututxline() function shall write out the structure into
       the user accounting database. It shall search for a  record  as  if  by  getutxid()  that  satisfies  the
       request.  If this search succeeds, then the entry shall be replaced. Otherwise, a new entry shall be made
       at the end of the user accounting database.

       The endutxent() function shall close the user accounting database.

       The setutxent() function shall reset the input to the beginning of the  database.  This  should  be  done
       before each search for a new entry if it is desired that the entire database be examined.

       These functions need not be thread-safe.

       No errors are defined  for  the  endutxent(),  getutxent(),  getutxid(),  getutxline(),  and  setutxent()
       functions.

       The pututxline() function may fail if:

       EPERM  The process does not have appropriate privileges.

       Thefollowingsectionsareinformative.

       None.

       None.

       endutxent, getutxent, getutxid, getutxline, pututxline, setutxent — user accounting database functions

       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.

       None.

       Upon  successful  completion, getutxent(), getutxid(), and getutxline() shall return a pointer to a utmpx
       structure containing a copy of the requested entry in the user accounting  database.  Otherwise,  a  null
       pointer shall be returned.

       The  return  value  may point to a static area which is overwritten by a subsequent call to getutxid() or
       getutxline().

       Upon successful completion, pututxline() shall return a pointer to a utmpx structure containing a copy of
       the entry added to the user accounting database. Otherwise, a null pointer shall be returned.

       The endutxent() and setutxent() functions shall not return a value.

       The Base Definitions volume of POSIX.1‐2017, <utmpx.h>

       #include <utmpx.h>

       void endutxent(void);
       struct utmpx *getutxent(void);
       struct utmpx *getutxid(const struct utmpx *id);
       struct utmpx *getutxline(const struct utmpx *line);
       struct utmpx *pututxline(const struct utmpx *utmpx);
       void setutxent(void);