setlogmask(3) — Linux manual page

setlogmask(3)           Library Functions Manual           setlogmask(3)

NAME         top

       setlogmask - set log priority mask

LIBRARY         top

       Standard C library (libc, -lc)

SYNOPSIS         top

       #include <syslog.h>

       int setlogmask(int mask);

DESCRIPTION         top

       A process has a log priority mask that determines which calls to
       syslog(3) may be logged.  All other calls will be ignored.
       Logging is enabled for the priorities that have the corresponding
       bit set in mask.  The initial mask is such that logging is
       enabled for all priorities.

       The setlogmask() function sets this logmask for the calling
       process, and returns the previous mask.  If the mask argument is
       0, the current logmask is not modified.

       The eight priorities are LOG_EMERG, LOG_ALERT, LOG_CRIT, LOG_ERR,
       LOG_WARNING, LOG_NOTICE, LOG_INFO, and LOG_DEBUG.  The bit
       corresponding to a priority p is LOG_MASK(p).  Some systems also
       provide a macro LOG_UPTO(p) for the mask of all priorities in the
       above list up to and including p.

RETURN VALUE         top

       This function returns the previous log priority mask.

ERRORS         top

       None.

ATTRIBUTES         top

       For an explanation of the terms used in this section, see
       attributes(7).
       ┌──────────────────────┬───────────────┬────────────────────────┐
       │ Interface            │ Attribute     │ Value                  │
       ├──────────────────────┼───────────────┼────────────────────────┤
       │ setlogmask()         │ Thread safety │ MT-Unsafe race:LogMask │
       └──────────────────────┴───────────────┴────────────────────────┘

STANDARDS         top

       POSIX.1-2008.

HISTORY         top

       POSIX.1-2001.

       LOG_UPTO() will be included in the next release of the POSIX
       specification (Issue 8).

SEE ALSO         top

       closelog(3), openlog(3), syslog(3)

COLOPHON         top

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Linux man-pages 6.9.1          2024-05-02                  setlogmask(3)

Pages that refer to this page: syslog(3),  org.freedesktop.LogControl1(5)

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