[Bug 40852] select(2): document action of close()'ing a fd during a select()

[bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r@public.gmane.org]

https://bugzilla.kernel.org/show_bug.cgi?id=40852





--- Comment #2 from Michael Kerrisk <mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>  2012-08-17 06:30:36 ---
I added some text under NOTES in select(2).

--- a/man2/select.2
+++ b/man2/select.2
@@ -411,6 +411,22 @@ when
 .B _GNU_SOURCE
 is defined.
 Since glibc 2.2.2 the requirements are as shown in the SYNOPSIS.
+.SS Multithreaded applications
+If a file descriptor being monitored by
+.BR select ()
+is closed in another thread, the result is unspecified.
+On some UNIX systems,
+.BR select ()
+unblocks and returns, with an indication that the file descriptor is ready
+(a subsequent I/O operation will likely fail with an error,
+unless another the file descriptor reopened between the time
+.BR select ()
+returned and the I/O operations was performed).
+On Linux (and some other systems),
+closing the file descriptor in another thread has no effect on
+.BR select ().
+In summary, any application that relies on a particular behavior
+in this scenario must be considered buggy.
 .SS "Linux Notes"
 The
 .BR pselect ()

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