/var/log/wtmp
database of past user logins
updwtmp3
Append an entry to the wtmp file
Usage
#include <utmp.h>
void updwtmp(const char *wtmp_path, const struct utmp *ut); void logwtmp(const char *line, const char *user, const char *host);
Library
System utilities library (libutil, -lutil)
Overview
updwtmp() appends the utmp structure ut to the wtmp file.
logwtmp() constructs a utmp structure using line, user, host, current time, and current process ID. Then it calls updwtmp() to append the structure to the wtmp file.
Files
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_path, 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.
Releases
16 releases since Debian 2.0 (Hamm); the text changed 13 times.