table of contents
updwtmp(3) | Library Functions Manual | updwtmp(3) |
NAME¶
updwtmp, logwtmp - append an entry to the wtmp file
LIBRARY¶
System utilities library (libutil, -lutil)
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
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 |
VERSIONS¶
For consistency with the other "utmpx" functions (see getutxent(3)), glibc provides (since glibc 2.1):
#define _GNU_SOURCE /* See feature_test_macros(7) */ #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.
STANDARDS¶
None.
HISTORY¶
Solaris, NetBSD.
SEE ALSO¶
2023-03-30 | Linux man-pages 6.04 |