That looks perfectly sane - what arch and OS version are you
	using? Also, are you certain its coming from that select() call,
	and not one somewhere else in the program :)

		David/absolute

    -=-  "They're only red from all the thoughts unused inside my head"  -=-

On Tue, 30 Mar 1999, Patrick Welche wrote:

> I was wondering if someone could give me some hints/tips debugging
> 
> Program terminated with signal 11, Segmentation fault.
> #0  0x16235 in select ()
> 
> This is actually in postgresql, fe-misc.c, pqWait():
> 
>         fd_set          input_mask;
>         fd_set          output_mask;
> ...
>                 FD_ZERO(&input_mask);
>                 FD_ZERO(&output_mask);
>                 if (forRead)
>                         FD_SET(conn->sock, &input_mask);
>                 if (forWrite)
>                         FD_SET(conn->sock, &output_mask);
>                 if (select(conn->sock + 1, &input_mask, &output_mask,
>                 	(fd_set *) NULL, (struct timeval *) NULL) < 0)
> 
> Now, conn->sock=7, forRead=1, forWrite=0,
> input_mask ={fds_bits = {128, 0, 0, 0, 0, 0, 0, 0}}
> output_mask={fds_bits = {  0, 0, 0, 0, 0, 0, 0, 0}}
> 
> So, all seems OK, so why the segfault? The only reference to select() I can
> find is a declaration in src/lib/libc/obj/LintSysNormal.c, so I don't know
> where to UTSL. From the sun os 6.5 man page, there is a suggestion that
> maybe &output_mask=(fd_set *)NULL might be handled differently to an
> output_mask set to zero - is this the case?
> 
> Cheers,
> 
> Patrick
>