Launching a signal handler for I / O

Question

Using C on Linux, how can I run a signal handler every time I write data to the buffer using the write () function. The handler will read all the data written to the buffer at runtime.

Answer 1

Sockets support this by activating async mode in the socket file descriptor. On Linux, this is done using fcntl calls:

/* set socket owner (the process that will receive signals) */
fcntl(fd, F_SETOWN, getpid());

/* optional if you want to receive a real-time signal instead of SIGIO */
fnctl(fd, F_SETSIG, signum);

/* turn on async mode -- this is the important part which enables signal delivery */
fcntl(fd, F_SETFL, fcntl(fd, F_GETFL, 0) | O_ASYNC);

Answer 2

Use pipe()with O_ASYNC, and you will get SIGIOon the read end of the pipe whenever new data about the pipe.

Answer 3

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Answer 4

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