GNU
2017-09-15
Aliases: logwtmp(3), logwtmp(3), logwtmp(3), logwtmp(3), logwtmp(3), logwtmp(3), logwtmp(3), logwtmp(3), updwtmpx(3), updwtmpx(3), updwtmpx(3), updwtmpx(3), updwtmpx(3), updwtmpx(3)
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Manual pages about using GNU/Linux for development
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Linux kernel and C library user-space interface documentation
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 |
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).
Interface | Attribute | Value |
Thread safety | MT-Unsafe sig:ALRM timer |
CONFORMING TO
Not in POSIX.1. 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)