1UPDWTMP(3)                 Linux Programmer's Manual                UPDWTMP(3)
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NAME

6       updwtmp, logwtmp - append an entry to the wtmp file
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SYNOPSIS

9       #include <utmp.h>
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11       void updwtmp(const char *wtmp_file, const struct utmp *ut);
12       void logwtmp(const char *line, const char *name, const char *host);
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14       For logwtmp(), link with -lutil.
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DESCRIPTION

17       updwtmp() appends the utmp structure ut to the wtmp file.
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19       logwtmp()  constructs  a utmp structure using line, name, host, current
20       time and current process ID.  Then it calls  updwtmp()  to  append  the
21       structure to the wtmp file.
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FILES

24       /var/log/wtmp
25              database of past user logins
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ATTRIBUTES

28       For   an   explanation   of   the  terms  used  in  this  section,  see
29       attributes(7).
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31       ┌───────────┬───────────────┬──────────────────────────┐
32       │Interface  │ Attribute     │ Value                    │
33       ├───────────┼───────────────┼──────────────────────────┤
34       │updwtmp(), │ Thread safety │ MT-Unsafe sig:ALRM timer │
35       │logwtmp()  │               │                          │
36       └───────────┴───────────────┴──────────────────────────┘
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CONFORMING TO

39       Not in POSIX.1.  Present on Solaris, NetBSD, and perhaps other systems.
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NOTES

42       For consistency with the other "utmpx"  functions  (see  getutxent(3)),
43       glibc provides (since version 2.1):
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45           #include <utmpx.h>
46           void updwtmpx (const char *wtmpx_file, const struct utmpx *utx);
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48       This  function performs the same task as updwtmp(), but differs in that
49       it takes a utmpx structure as its last argument.
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SEE ALSO

52       getutxent(3), wtmp(5)
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COLOPHON

55       This page is part of release 4.16 of the Linux  man-pages  project.   A
56       description  of  the project, information about reporting bugs, and the
57       latest    version    of    this    page,    can     be     found     at
58       https://www.kernel.org/doc/man-pages/.
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62GNU                               2017-09-15                        UPDWTMP(3)
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