setlogmask(3) - Linux manual page (original) (raw)

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)](../man3/syslog.3.html) 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 _LOGMASK(p)_.  Some systems also
   provide a macro _LOGUPTO(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)](../man7/attributes.7.html).
   ┌───────────────────────┬───────────────┬────────────────────────┐
   │ **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)](../man3/closelog.3.html), [openlog(3)](../man3/openlog.3.html), [syslog(3)](../man3/syslog.3.html)

COLOPHON top

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Linux man-pages 6.10 2024-07-23 setlogmask(3)

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