LDP
/
man-pages
mirror of https://github.com/mkerrisk/man-pages
0
1
Fork 0
Code Releases Activity

select.2: Linux select() is buggy wrt POSIX in its check for EBADF errors 

Reported-by: Matthew Wilcox <willy@infradead.org>
Reported-by: Carlos O'Donell <carlos@redhat.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2017-03-24 15:32:32 +01:00
parent ad8c02ab2e
commit 8b58a9d467
1 changed files with 17 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
man2/select.2
View File

@ -163,7 +163,10 @@ this is useful after
returns.
.PP
.I nfds
is the highest-numbered file descriptor in any of the three sets, plus 1.
should be set to the highest-numbered file descriptor in any
of the three sets, plus 1.
The indicated file descriptors in each set are checked, up to this limit
(but see BUGS).
.PP
The
.I timeout
@ -328,6 +331,7 @@ becomes undefined.
An invalid file descriptor was given in one of the sets.
(Perhaps a file descriptor that was already closed,
or one on which an error has occurred.)
However, see BUGS.
.TP
.B EINTR
A signal was caught; see
@ -542,6 +546,18 @@ To monitor file descriptors greater than 1023, use
.BR poll (2)
instead.
According to POSIX,
.BR select ()
should check all specified file descriptors in the three file descriptor sets,
up to the limit
.IR nfds\-1 .
However, the current implementation ignores any file descriptor in
these sets that is greater than the maximum file descriptor number
that the process currently has open.
According to POSIX, any such file descriptor that is specified in one
of the sets should result in the error
.BR EBADF .
Glibc 2.0 provided a version of
.BR pselect ()
that did not take a