logwtmp

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



NAME
       updwtmp, logwtmp - append an entry to the wtmp file

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);

       For logwtmp(), link with -lutil.

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(), │ Thread safety │ MT-Unsafe sig:ALRM timer │
       │logwtmp()  │               │                          │
       └───────────┴───────────────┴──────────────────────────┘

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

NOTES
       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
       getutxent(3), wtmp(5)

COLOPHON
       This page is part of release 5.03 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                               2017-09-15                        UPDWTMP(3)