logwtmp(3) [plan9 man page]

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

NAME

       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 https://www.kernel.org/doc/man-pages/.

GNU
								    2017-09-15								UPDWTMP(3)

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

NAME

       getutmp, getutmpx - copy utmp structure to utmpx, and vice versa

SYNOPSIS

       #define _GNU_SOURCE             /* See feature_test_macros(7) */
       #include <utmpx.h>

        void getutmp(const struct utmpx *ux, struct utmp *u);
        void getutmpx(const struct utmp *u, struct utmpx *ux);

DESCRIPTION

       The  getutmp() function copies the fields of the utmpx structure pointed to by ux to the corresponding fields of the utmp structure pointed
       to by u.  The getutmpx() function performs the converse operation.

RETURN VALUE

       These functions do not return a value.

VERSIONS

       These functions first appeared in glibc in version 2.1.1.

ATTRIBUTES

       For an explanation of the terms used in this section, see attributes(7).

       +----------------------+---------------+---------+
       |Interface             | Attribute     | Value   |
       +----------------------+---------------+---------+
       |getutmp(), getutmpx() | Thread safety | MT-Safe |
       +----------------------+---------------+---------+
CONFORMING TO

       These functions are nonstandard, but appear on a few other systems, such as Solaris and NetBSD.

NOTES

       These functions exist primarily for compatibility with other systems where the utmp and utmpx structures contain different fields,  or  the
       size of corresponding fields differs.  On Linux, the two structures contain the same fields, and the fields have the same sizes.

SEE ALSO

       utmpdump(1), getutent(3), utmp(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 https://www.kernel.org/doc/man-pages/.

Linux                                                               2015-03-02                                                          GETUTMP(3)