Re: Possible problem with zero-copy TCP and sendfile()

[Jan Kasprzak <kas@informatics.muni.cz>]

Wolfgang Rohdewald wrote:
: On Tuesday 17 April 2001 22:36, Jan Kasprzak wrote:
: > +    if (len == -1 || len > 0 && len < count) {
: 
: are you sure there are no missing () ?
: 
: if ((len == -1) || (len > 0) && (len < count)) {
: 
: assumig that && has precedence over || (I believe so)

	Yes, but the precedence of ==, <, and > is even higher.
However, I've found a problem with the previous patch: The first chunk should
read:

-    if((len = sendfile(session.d->outf->fd, retr_fd, offset, count)) == -1) {
+    len = sendfile(session.d->outf->fd, retr_fd, offset, count);
+    if (len == -1 || len > 0 && len < count) {
+       if (len != -1)
+              errno = EINTR;

i.e. we should not overwrite errno, when it is valid.

-Yenya

PS.: You can find the C operators precedence for example at
	http://www.howstuffworks.com/c14.htm (found by Google).

-- 
\ Jan "Yenya" Kasprzak <kas at fi.muni.cz>       http://www.fi.muni.cz/~kas/
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