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When a computer is first powered on, the special type of absolute loader is known as the pre-boot loader.
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setlogmask(3) [centos man page]

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 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. CONFORMING TO
POSIX.1-2001. Note that the description in POSIX.1-2001 is flawed. SEE ALSO
closelog(3), openlog(3), syslog(3) COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. 2001-10-05 SETLOGMASK(3)

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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 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. CONFORMING TO
POSIX.1-2001. Note that the description in POSIX.1-2001 is flawed. SEE ALSO
closelog(3), openlog(3), syslog(3) COLOPHON
This page is part of release 3.25 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. 2001-10-05 SETLOGMASK(3)

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