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Name

updwtmp, logwtmp - append an entry to the wtmp file

Synopsis


#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.

Description

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.

Files

/var/log/wtmp
database of past user logins

Conforming to

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

Notes

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.

See Also

getutxent(3) , wtmp(5)

Colophon

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