pthread_sigmask2
Examine and/or change a thread's signal mask
Usage
#include <signal.h>
int
pthread_sigmask(int how, const sigset_t * restrict set, sigset_t * restrict oset);
Overview
The pthread_sigmask() function examines and/or changes the calling thread's signal mask.
If set is not NULL, it specifies a set of signals to be modified, and how specifies what to set the signal mask to:
- SIG_BLOCK
-
Union of the current mask and set.
- SIG_UNBLOCK
-
Intersection of the current mask and the complement of set.
- SIG_SETMASK
-
set.
If oset is not NULL, the previous signal mask is stored in the location pointed to by oset.
SIGKILL and SIGSTOP cannot be blocked, and will be silently ignored if included in the signal mask.
Return values
If successful, pthread_sigmask() returns 0. Otherwise, an error is returned.
Errors
The pthread_sigmask() function will fail if:
- [EINVAL]
-
how is not one of the defined values.
Legacy synopsis
#include <pthread.h> #include <signal.h>
The include file ⟨pthread.h⟩ is necessary.
Releases
149 releases since Mac OS X 10.2; the text changed 3 times.