NAME | SYNOPSIS | DESCRIPTION | FILES | ATTRIBUTES | CONFORMING TO | NOTES | SEE ALSO | COLOPHON

UPDWTMP(3)                Linux Programmer's Manual               UPDWTMP(3)

NAME         top

       updwtmp, logwtmp - append an entry to the wtmp file

SYNOPSIS         top

       #include <utmp.h>

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

       For logwtmp(), link with -lutil.

DESCRIPTION         top

       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         top

       /var/log/wtmp
              database of past user logins

ATTRIBUTES         top

       For an explanation of the terms used in this section, see
       attributes(7).

       ┌───────────┬───────────────┬──────────────────────────┐
       │Interface  Attribute     Value                    │
       ├───────────┼───────────────┼──────────────────────────┤
       │updwtmp(), │ Thread safety │ MT-Unsafe sig:ALRM timer │
       │logwtmp()  │               │                          │
       └───────────┴───────────────┴──────────────────────────┘

CONFORMING TO         top

       Not in POSIX.1.  Present on Solaris, NetBSD, and perhaps other
       systems.

NOTES         top

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

       #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.

SEE ALSO         top

       getutxent(3), wtmp(5)

COLOPHON         top

       This page is part of release 4.07 of the Linux man-pages project.  A
       description of the project, information about reporting bugs, and the
       latest version of this page, can be found at
       https://www.kernel.org/doc/man-pages/.

GNU                              2015-04-19                       UPDWTMP(3)