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); For logwtmp(), link with -lutil.
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.
/var/log/wtmp database of past user logins
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() │ │ │ └───────────┴───────────────┴──────────────────────────┘
Not in POSIX.1. Present on Solaris, NetBSD, and perhaps other systems.
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.
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