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dirmngr,w32: Hack around a select problem.

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* dirmngr/dns.c (FD_SETSIZE): Bump up to 1024.
(dns_poll): Return an error instead of hitting an assertion failure.
--

For unknown reasons socket() return fd with values 244, 252, 268.  The
latter is above the FD_SETSIZE of 256.  It seems that select has been
build with a highler FD_SETSIZE limit.  Bump up to a reasonable large
value.

A better solution would be to grab some code from npth_eselect to
replace select.  We could also use npth_eselect direclty in
dns-stuff.c instead of using dns_res_poll.

Signed-off-by: Werner Koch <wk@gnupg.org>
This commit is contained in:
Werner Koch 2016-12-19 16:37:50 +01:00
parent aec89a7297
commit d51499fdc5
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GPG Key ID: E3FDFF218E45B72B
1 changed files with 3 additions and 2 deletions
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5
dirmngr/dns.c
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@ -50,7 +50,7 @@
#if _WIN32
#ifndef FD_SETSIZE
#define FD_SETSIZE 256
#define FD_SETSIZE 1024
#endif
#include <winsock2.h>
#include <ws2tcpip.h>
@ -1107,7 +1107,8 @@ static int dns_poll(int fd, short events, int timeout) {
if (!events)
return 0;
assert(fd >= 0 && (unsigned)fd < FD_SETSIZE);
if (fd < 0 || (unsigned)fd >= FD_SETSIZE)
return EINVAL;
FD_ZERO(&rset);
FD_ZERO(&wset);