SETLOGMASK(3) Linux Programmer's Manual SETLOGMASK(3)
setlogmask - set log priority mask
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 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
This function returns the previous log priority mask.
XPG4. Note that the description in POSIX 1003.1-2001 is flawed.
closelog(3), openlog(3), syslog(3)