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logwtmp(3) [minix man page]

UPDWTMP(3)						     Linux Programmer's Manual							UPDWTMP(3)

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(), | Thread safety | MT-Unsafe sig:ALRM timer | |logwtmp() | | | +-----------+---------------+--------------------------+ 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
getutxent(3), wtmp(5) COLOPHON
This page is part of release 4.15 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 GNU
2017-09-15 UPDWTMP(3)

Check Out this Related Man Page

LOGIN(3)						     Linux Programmer's Manual							  LOGIN(3)

login, logout - write utmp and wtmp entries SYNOPSIS
#include <utmp.h> void login(const struct utmp *ut); int logout(const char *ut_line); Link with -lutil. DESCRIPTION
The utmp file records who is currently using the system. The wtmp file records all logins and logouts. See utmp(5). The function login() takes the supplied struct utmp, ut, and writes it to both the utmp and the wtmp file. The function logout() clears the entry in the utmp file again. GNU Details More precisely, login() takes the argument ut struct, fills the field ut->ut_type (if there is such a field) with the value USER_PROCESS, and fills the field ut->ut_pid (if there is such a field) with the process ID of the calling process. Then it tries to fill the field ut->ut_line. It takes the first of stdin, stdout, stderr that is a tty, and stores the corresponding pathname minus a possible leading /dev/ into this field, and then writes the struct to the utmp file. On the other hand, if no tty name was found, this field is filled with "???" and the struct is not written to the utmp file. After this, the struct is written to the wtmp file. The logout() function searches the utmp file for an entry matching the ut_line argument. If a record is found, it is updated by zeroing out the ut_name and ut_host fields, updating the ut_tv timestamp field and setting ut_type (if there is such a field) to DEAD_PROCESS. RETURN VALUE
The logout() function returns 1 if the entry was successfully written to the database, or 0 if an error occurred. FILES
/var/run/utmp user accounting database, configured through _PATH_UTMP in <paths.h> /var/log/wtmp user accounting log file, configured through _PATH_WTMP in <paths.h> CONFORMING TO
Not in POSIX.1-2001. Present on the BSDs. NOTES
Note that the member ut_user of struct utmp is called ut_name in BSD. Therefore, ut_name is defined as an alias for ut_user in <utmp.h>. SEE ALSO
getutent(3), utmp(5) COLOPHON
This page is part of release 3.44 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at GNU
2004-05-06 LOGIN(3)
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