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
.
/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(), logwtmp() |
Thread safety | MT-Unsafe sig:ALRM timer |
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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