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);
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
Not in POSIX.1-2001. Present on Solaris, NetBSD, and perhaps other systems.
AVAILABILITY¶
Both functions are available under glibc2, but not under libc5. However,
logwtmp() used to occur in the old libbsd. These days, the
logwtmp() function is included in libutil. (Hence you'll need to add
-lutil to your compiler command line to get it.)
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¶
This page is part of release 3.44 of the Linux
man-pages project. A
description of the project, and information about reporting bugs, can be found
at
http://www.kernel.org/doc/man-pages/.