setlogmask man page on Archlinux

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SETLOGMASK(3)		   Linux Programmer's Manual		 SETLOGMASK(3)

       setlogmask - set log priority mask

       #include <syslog.h>

       int setlogmask(int mask);

       A  process  has a log priority mask that determines which calls to sys‐
       log(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 correspond‐
       ing 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.

       This function returns the previous log priority mask.


       POSIX.1-2001.  Note that the description in POSIX.1-2001 is flawed.

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

       This page is part of release 3.65 of the Linux  man-pages  project.   A
       description  of	the project, and information about reporting bugs, can
       be found at

				  2001-10-05			 SETLOGMASK(3)

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