06-26-2004
Displaying fields in wtmp file?
Anyone have any idea on how to display the fields for each record stored in the wtmp file using C? Am I correct in thinking that the info stored in wtmp is in binary and that utmpx will be of some help? Being a beginner, I can come up with bits and pieces of what I might need in order to do the task, but have a harder time putting all the pieces together to form working code. I am assuming I need to include these bits of code:
#include <utmp.h>
#include <utmpx.h>
struct utmpx record;
fread(&record, sizeof(record), ???)
printf(??????)
Any assistance would be greatly appreciated. Thanks.
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LEARN ABOUT DEBIAN
logwtmp
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);
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
CONFORMING TO
Not in POSIX.1-2001. Present on Solaris, NetBSD, and perhaps other systems.
AVAILABILITY
Both functions are available under glibc2, but not under libc5. However, logwtmp() used to occur in the old libbsd. These days, the
logwtmp() function is included in libutil. (Hence you'll need to add -lutil to your compiler command line to get it.)
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 3.44 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
GNU
2008-07-02 UPDWTMP(3)