logwtmp (3)

#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

Not in POSIX.1-2001. 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.

getutxent(3), wtmp(5)

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