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

       updwtmp, logwtmp - append an entry to the wtmp file

       #include <utmp.h>

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

       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 utmp file.

              database of past user logins

       Not  in  POSIX.1-2001.   Present  on Solaris, NetBSD, and perhaps other

       Both functions are available under glibc2, but not under  libc5.   How-
       ever,  logwtmp()  used  to  occur  in  the old libbsd.  These days, the
       logwtmp() function is included in libutil.  (Hence you'll need  to  add
       -lutil to your compiler command line to get it.)

       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.

       getutxent(3), wtmp(5)

       This  page  is  part of release 3.05 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at

GNU                               2008-07-02                        UPDWTMP(3)

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