UPDWTMPSection: Linux Programmer's Manual (3)
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NAMEupdwtmp, logwtmp - append an entry to the wtmp file
#include <utmp.h> void updwtmp(const char *wtmp_file, const struct utmp *ut);
void logwtmp(const char *line, const char *name, const char *host);
DESCRIPTIONupdwtmp() appends the utmp structure ut to the wtmp file.
- database of past user logins
CONFORMING TONot in POSIX.1-2001. Present on Solaris, NetBSD, and perhaps other systems.
AVAILABILITYBoth 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.)
NOTESFor 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);
SEE ALSOgetutxent(3), wtmp(5)
COLOPHONThis page is part of release 3.21 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/.