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 ut
to the wtmp file.
() constructs a utmp structure using line
, 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. However,
() used to occur in the old libbsd. These days, the
() function is included in libutil. (Hence you'll need to add
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 updwtmp
(), but differs in that it
takes a utmpx
structure as its last argument.
This page is part of release 3.44 of the Linux man-pages
description of the project, and information about reporting bugs, can be found