From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r@public.gmane.org
Subject: [Bug 95331] fcntl.2 + sigaction.2 + signal.7 need further
information about use of a SA_SIGINFO signal handler that uses si->si_fd
Date: Sun, 03 May 2015 00:16:44 +0000
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https://bugzilla.kernel.org/show_bug.cgi?id=95331
--- Comment #16 from Jason Vas Dias ---
Since currently ONLY open() already waits for readers to connect :
case FMODE_WRITE:
/*
* O_WRONLY
* POSIX.1 says that O_NONBLOCK means return -1 with
* errno=ENXIO when there is no process reading the FIFO.
*/
ret = -ENXIO;
if (!is_pipe && (filp->f_flags & O_NONBLOCK) && !pipe->readers)
goto err;
pipe->w_counter++;
if (!pipe->writers++)
wake_up_partner(pipe);
if (!is_pipe && !pipe->readers) {
if (wait_for_partner(pipe, &pipe->r_counter))
goto err_wr;
}
break;
I think if O_ASYNC is set and O_NONBLOCK is NOT set , once ONE sigpipe
or EPIPE has been generated, then the next write should block for pipes
marked with sigio_on_write_enabled , and also readers should generate
the SIGIO events BEFORE they are about to read. I guess such changes
might take a long time to become accepted ...
But which paragraphs of which standard are meant to apply to this
situtation ? Where is it specified what SHOULD happen in these cases ?
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