NAME

       updwtmp, logwtmp - append an entry to the wtmp file

LIBRARY

       System utilities library (libutil, -lutil)

SYNOPSIS

       #include <utmp.h>

       void updwtmp(const char *wtmp_file, const struct utmp *ut);
       void logwtmp(const char *line, const char *name, const char *host);

DESCRIPTION

       updwtmp() appends the utmp structure ut to the wtmp file.

       logwtmp() constructs a utmp structure using line, name, host, current time, and current process ID.  Then
       it calls updwtmp() to append the structure to the wtmp file.

FILES

       /var/log/wtmp
              database of past user logins

ATTRIBUTES

       For an explanation of the terms used in this section, see attributes(7).
       ┌────────────────────────────────────────────────────────────┬───────────────┬──────────────────────────┐
       │ Interface                                                  │ Attribute     │ Value                    │
       ├────────────────────────────────────────────────────────────┼───────────────┼──────────────────────────┤
       │ updwtmp(), logwtmp()                                       │ Thread safety │ MT-Unsafe sig:ALRM timer │
       └────────────────────────────────────────────────────────────┴───────────────┴──────────────────────────┘

VERSIONS

       For consistency with the other "utmpx" functions (see getutxent(3)), glibc provides (since glibc 2.1):

           #define _GNU_SOURCE          /* See feature_test_macros(7) */
           #include <utmpx.h>
           void updwtmpx (const char *wtmpx_file, const struct utmpx *utx);

       This  function performs the same task as updwtmp(), but differs in that it takes a utmpx structure as its
       last argument.

STANDARDS

       None.

HISTORY

       Solaris, NetBSD.

SEE ALSO

       getutxent(3), wtmp(5)

Linux man-pages 6.7                                2023-10-31                                         updwtmp(3)