setlogmask(3) — Linux manual page

setlogmask(3)           Library Functions Manual           setlogmask(3)

NAME

       setlogmask - set log priority mask

LIBRARY

       Standard C library (libc, -lc)

SYNOPSIS

       #include <syslog.h>

       int setlogmask(int mask);

DESCRIPTION

       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

       This function returns the previous log priority mask.

ERRORS

       None.

ATTRIBUTES

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

STANDARDS

       POSIX.1-2008.

HISTORY

       POSIX.1-2001.

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

SEE ALSO

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

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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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