User code to enable async notification by SIGIO:
\nsignal(SIGIO, &handler); \/\/ instead, do sigaction() in real code!
\nfcntl(fd, F_SETOWN, getpid());
\nint oflags = fcntl(fd, F_GETFL);
\nfcntl(fd, F_SETFL, oflags|FASYNC);
\nDriver method:
\nfilp->fasync(): called when FASYNC flag has modified.
\nKernel functions:
\nfasync_helper(): Register listener process.
\nkill_fasync(): Transmit signals to listener processes.<\/p>\n","protected":false},"excerpt":{"rendered":"