redhat man page for setlogmask

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

NAME
       setlogmask - set log priority mask

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  priori-
       ties.

       The setlogmask() function sets this logmask for the current 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.

CONFORMING TO
       XPG4.  Note that the description in POSIX 1003.1-2001 is flawed.

SEE ALSO
       closelog(3), openlog(3), syslog(3)

								    2001-10-05							     SETLOGMASK(3)