pthread_sigmask()

Examine and change blocked signals

Synopsis:

#include <signal.h>

int pthread_sigmask( int how,
                     const sigset_t* set,
                     sigset_t* oset );

Arguments:

how
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.

set
A pointer to a sigset_t object that specifies the signals that you want to affect in the mask.
oset
NULL, or a pointer to a sigset_t object where the function can store the thread's old signal mask.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

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.

In order to change the signal mask, your process must have the PROCMGR_AID_SIGNAL ability enabled. For more information, see procmgr_ability() .

You can't block the SIGKILL and SIGSTOP signals.

Returns:

EOK
Success.
EINVAL
Invalid how parameter.
EPERM
The calling process doesn't have the required permission; see procmgr_ability() .

Classification:

POSIX 1003.1 THR

Safety:
Cancellation point No
Interrupt handler No
Signal handler Yes
Thread Yes

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