From:	cgf AT cygnus DOT com (Christopher Faylor)
Subject:	Re: Problem with select()
19 Sep 1998 20:17:42 -0700 :
Message-ID:	<19980919225157.A6978.cygnus.cygwin32.developers@cygnus.com>
References:	<01BDE3E8 DOT 3772F340 AT sos>
Mime-Version:	1.0
To:	Sergey Okhapkin <sos AT prospect DOT com DOT ru>,
	"'cygwin32-developers AT cygnus DOT com'" <cygwin32-developers AT cygnus DOT com>

On Sat, Sep 19, 1998 at 04:11:52PM +0400, Sergey Okhapkin wrote:
>Sergey Okhapkin wrote:
>> I run NTS4.0 SP3 with MS winsock proxy client installed. To fix a problem I made >the following changes in select() code:
>
>The problem still present:
>
>[main] wget 1017 (0) cygwin32_select: 4, 0x0, 0x242EB40, 0x242EB38, 0x242EB30
>[main] wget 1017 (0) hinfo::select_write: /dev/tcp fd 3
>[main] wget 1017 (0) hinfo::select_except: /dev/tcp fd 3
>[main] wget 1017 (0) start_thread_socket: adding socket 0x194
>[main] wget 1017 (0) start_thread_socket: stuff_start 0x242EA4C, exitsock 184
>[main] wget 1017 (0) select_stuff::wait: n 2, ms 900000
>[select_socket] wget 1017 (0) thread_socket: stuff_start 0xA044E44
>[select_socket] wget 1017 (0) thread_socket: Win32 select returned -1
>[select_socket] wget 1017 (0) thread_socket: error 10038
>[select_socket] wget 1017 (0) thread_socket: s 0xA041DF0, testing fd 3 (/dev/tcp)
>[select_socket] wget 1017 (0) handle_exceptions: In cygwin32_except_handler exc C0000005 at 776B94D8 sp 20CFFF48
>[select_socket] wget 1017 (0) handle_exceptions: In cygwin32_except_handler sig = 11 at 776B94D8
>[select_socket] wget 1017 (0) handle_exceptions: Exception: STATUS_ACCESS_VIOLATION
>[select_socket] wget 1017 (0) handle_exceptions: Dumping stack trace to wget.exe.core
>[select_socket] wget 1017 (0) exception: trapped!
>[select_socket] wget 1017 (0) exception: code C0000005 at 776B94D8(select_socket)
>[select_socket] wget 1017 (0) exception: ax 0 bx A041DF0 cx 194 dx C7381E34
>[select_socket] wget 1017 (0) exception: si 194 di 6F4CFFFF bp 20CFFF88 sp 20CFFF48
>[select_socket] wget 1017 (0) exception: exception is: STATUS_ACCESS_VIOLATION

Ok.  I played with this a little.  This seems to fix things.  I don't know
why.  I just did it for debugging purposes and everything started working.

Index: select.h
===================================================================
RCS file: /cvs/cvsfiles/devo/winsup/select.h,v
retrieving revision 1.2
diff -u -p -r1.2 select.h
--- select.h	1998/09/11 02:21:45	1.2
+++ select.h	1998/09/20 02:45:18
@@ -28,7 +28,7 @@ typedef struct winsock_fd_set
 #define WINSOCK_FD_SET(fd, set) do { \
 	       (set)->fd_array[(set)->fd_count++]=fd;\
 } while(0)
-#define WINSOCK_FD_ZERO(set) ((set)->fd_count=0)
+#define WINSOCK_FD_ZERO(set) memset ((set), 0, sizeof (*(set)))
 #define WINSOCK_FD_CLR(fd, set) do { \
     u_int __i; \
     for (__i = 0; __i < (set)->fd_count ; __i++) { \

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