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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 priori‐
ties 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 modi‐
fied.
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.
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).
┌───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┬───────────────┬────────────────────────┐
│Interface │ Attribute │ Value │
├───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┼───────────────┼────────────────────────┤
│setlogmask() │ Thread safety │ MT-Unsafe race:LogMask │
└───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┴───────────────┴────────────────────────┘
CONFORMING TO
POSIX.1-2001, POSIX.1-2008.
LOG_UPTO() will be included in the next release of the POSIX specification (Issue 8).
SEE ALSO
closelog(3), openlog(3), syslog(3)
2021-03-22 SETLOGMASK(3)