Re: echo > * and EMFILE

[Peter Stephenson <pws@csr.com>]

Stephane Chazelas wrote:
> Hi guys,
> 
> $ touch {1..2000}
> $ : > *
> $ echo *(L1) | wc
>   1    1007    4921
> 
> zsh obviously couldn't open that many files, which is normal,
> the number of files a process can open at the same time is
> generally limited.
> 
> But the problem here is that zsh didn't output any error
> message. So that the user might think he erased the content of
> every file when actually he didn't.

There are lots and lots of unchecked system calls; it would be very
useful to handle them better.  Fixing them up as well as consistently
handling the errors without, for example, file descriptor leaks needs a
lot of work.  (The fact we don't handle errors well at the moment is
probably actually a bonus from the latter point of view: we're just
closing a lot of file descriptors that are -1, which is useless but
harmless.)

> Also:
> 
> $ zsh -c 'zmodload zsh/net/tcp; for f ({1..1020}) ztcp -l $((f+2000))'
> ztcp: could not bind to port 40968: address already in use

The error message doesn't switch from network to host order; that's
easy to fix.

> I get similar problems with zsocket.

Which message is wrong?  There's no network order problem here, so it
must be something else.

Index: Src/Modules/tcp.c
===================================================================
RCS file: /cvsroot/zsh/zsh/Src/Modules/tcp.c,v
retrieving revision 1.41
diff -u -r1.41 tcp.c
--- Src/Modules/tcp.c	30 May 2006 22:35:03 -0000	1.41
+++ Src/Modules/tcp.c	13 Feb 2007 10:46:16 -0000
@@ -432,7 +432,7 @@
 	if (bind(sess->fd, (struct sockaddr *)&sess->sock.in, sizeof(struct sockaddr_in)))
 	{
 	    char buf[DIGBUFSIZE];
-	    convbase(buf, (zlong)lport, 10);
+	    convbase(buf, (zlong)ntohs(lport), 10);
 	    zwarnnam(nam, "could not bind to port %s: %e", buf, errno);
 	    tcp_close(sess);
 	    return 1;

-- 
Peter Stephenson <pws@csr.com>                  Software Engineer
CSR PLC, Churchill House, Cambridge Business Park, Cowley Road
Cambridge, CB4 0WZ, UK                          Tel: +44 (0)1223 692070


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