Name
updwtmp, logwtmp - append an entry to the wtmp fileLibrary
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 |
| T} | 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(7)_GNU_SOURCE " "/* See feature_test_macros */" #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.