sigprocmask(2)

DESCRIPTION

Blocks, unblocks, or replaces the signal mask.

SYNOPSIS

long sigprocmask(int how, uint32_t set, uint32_t *old);

RETURN VALUE

• Returns a non-negative result on success. Negative values are ABI errno codes.

ERRORS

• -EFAULT
  • The old mask pointer is not writable userspace memory.
• -EINVAL
  • The operation is not BLOCK, UNBLOCK, or SETMASK.
• -ESRCH
  • There is no current process.

ABI

Arguments enter through the direct syscall ABI; validation is performed before entering the process subsystem.