updwtmp

Section: C Library Functions (3)
Updated: 202-0-08
Index Return to Main Contents

---

 

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_path, const struct utmp *ut);
void logwtmp(const char *line, const char *user, const char *host);

 

DESCRIPTION

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

/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	M-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.  

STANDARDS

None.  

HISTORY

Solaris, NetBSD.  

SEE ALSO

getutxent(3), wtmp(5)

---

 

Index

NAME

LIBRARY

SYNOPSIS

DESCRIPTION

FILES

ATTRIBUTES

VERSIONS

STANDARDS

HISTORY

SEE ALSO