updwtmp(3) Library Functions Manual updwtmp(3) updwtmp, logwtmp - wtmp System utilities library (libutil, -lutil) #include void updwtmp(const char *wtmp_file, const struct utmp *ut); void logwtmp(const char *line, const char *name, const char *host); updwtmp() utmp ut wtmp. 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. /var/log/wtmp attributes(7). +----------------------------+----------------------------------------------------------+--------------------------+ | | | | +----------------------------+----------------------------------------------------------+--------------------------+ |updwtmp(), logwtmp() | | MT-Unsafe sig:ALRM timer | +----------------------------+----------------------------------------------------------+--------------------------+ 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 void updwtmpx (const char *wtmpx_file, const struct utmpx *utx); updwtmp(); , utmpx. . Solaris, NetBSD. getutxent(3), wtmp(5) () Azamat Hackimov , Dmitriy Ovchinnikov , Dmitry Bolkhovskikh , Katrin Kutepova , Yuri Kozlov , Kirill Rekhov ; GNU (GNU General Public License - GPL, 3 ) , - . - , , () () () <>. Linux 6.9.1 2 2024 . updwtmp(3)