table of contents
UPDWTMP(3) | Linux Programmer's Manual | UPDWTMP(3) |
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 |
updwtmp (), logwtmp () | 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¶
COLOPHON¶
This page is part of release 5.10 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.
2017-09-15 | GNU |