Examine and change blocked signals
#include <signal.h> int pthread_sigmask( int how, const sigset_t* set, sigset_t* oset );
- How you want to change the signal mask; one of:
- SIG_BLOCK — make the resulting signal mask the union of the current signal mask and the signal set set.
- SIG_UNBLOCK — make the resulting signal mask the intersection of the current signal mask and the complement of the signal set set.
- SIG_SETMASK — make the resulting signal mask the signal set set.
This argument is valid only if set is non-NULL.
- A pointer to a sigset_t object that specifies the signals that you want to affect in the mask.
- NULL, or a pointer to a sigset_t object where the function can store the thread's old signal mask.
Use the -l c option to qcc to link against this library. This library is usually included automatically.
The pthread_sigmask() function is used to examine and/or change the calling thread's signal mask. If set is non-NULL, the thread's signal mask is set to set. If oset is non-NULL, the thread's old signal mask is returned in oset.
You can't block the SIGKILL and SIGSTOP signals.
- Invalid how parameter.
- The calling process doesn't have the required permission; see procmgr_ability() .