pthread_sigmask(3T)pthread_sigmask(3T)NAMEpthread_sigmask() - examine/change signal mask of calling thread
SYNOPSISPARAMETERS
how This parameter defines how the signal mask of the
calling thread will be changed.
set Pointer to the set of signals that will be used to
change the currently blocked signal set.
oset Pointer to where the previous signal mask will be
returned.
DESCRIPTION
allows the calling thread to examine and/or change its signal mask.
Unless it is a null pointer, the argument set points to a set of sig‐
nals which are to be used to change the currently blocked signal set.
The argument how indicates how the set is changed. The legal values
are:
The resulting set is the union of the current set and the signal
set pointed to by set.
The resulting set is the intersection of the current set
and the complement of the signal set pointed
to by set.
The resulting set is the signal set pointed to by
set.
If the argument oset is not a null pointer, the previous signal mask is
returned in oset. If set is a null pointer, the value of the argument
how is insignificant and the thread's signal mask is unchanged; thus,
the call can be used to inquire about currently blocked signals.
If there any pending unblocked signals after the call to at least one
of those signals is delivered before the call to returns.
It is impossible to block the or signal. This is enforced by the sys‐
tem without causing an error to be indicated.
The thread's signal mask is not changed if fails for any reason.
RETURN VALUE
Upon successful completion, returns zero. Otherwise, an error number
is returned to indicate the error (the variable is not set).
ERRORS
If any of the following occur, the function returns the corresponding
error number:
how contains an invalid value.
set or oset points to an invalid address. The reli‐
able detection of this error is implementation
dependent.
AUTHOR
was derived from the IEEE POSIX P1003.1c standard.
SEE ALSOsigprocmask(2).
STANDARDS CONFORMANCE
Pthread Library pthread_sigmask(3T)
