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Linux Programmer's Manual (3)
updwtmp, logwtmp - append an entry to the wtmp file
void updwtmp(const char *wtmp_file, const struct utmp *ut);
void logwtmp(const char *line, const char *name, const char *host);
appends the utmp structure
to the wtmp file.
constructs a utmp structure using
line, name, host,
current time and current process ID.
Then it calls
to append the structure to the wtmp file.
database of past user logins
Not in POSIX.1-2001.
Present on Solaris, NetBSD, and perhaps other systems.
Both functions are available under glibc2, but not under libc5.
used to occur in the old libbsd.
These days, the
function is included in libutil.
(Hence you'll need to add -lutil
to your compiler command line to get it.)
For consistency with the other "utmpx" functions (see
glibc provides (since version 2.1):
void updwtmpx (const char *wtmpx_file, const struct utmpx *utx);
This function performs the same task as
but differs in that it takes a
structure as its last argument.
This page is part of release 3.66 of the Linux
A description of the project,
information about reporting bugs,
and the latest version of this page,
can be found at
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- SEE ALSO
This document was created by
using the manual pages.
Time: 21:43:03 GMT, July 12, 2014