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updwtmp, logwtmp — append an entry to the wtmp file
#include <utmp.h>
void
updwtmp( |
const char *wtmp_file, |
const struct utmp *ut); |
void
logwtmp( |
const char *line, |
| const char *name, | |
const char *host); |
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.
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.)
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.