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Justine Tunney 2020-06-15 07:18:57 -07:00
commit c91b3c5006
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libc/sock/winsockblock.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ This program is free software; you can redistribute it and/or modify │
│ it under the terms of the GNU General Public License as published by │
│ the Free Software Foundation; version 2 of the License. │
│ │
│ This program is distributed in the hope that it will be useful, but │
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
│ General Public License for more details. │
│ │
│ You should have received a copy of the GNU General Public License │
│ along with this program; if not, write to the Free Software │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/assert.h"
#include "libc/errno.h"
#include "libc/nt/winsock.h"
#include "libc/sock/internal.h"
#include "libc/sock/sock.h"
#include "libc/str/str.h"
textwindows int64_t winsockblock(int64_t fh, unsigned eventbit, int64_t rc) {
int64_t eh;
struct NtWsaNetworkEvents ev;
if (rc != -1) return rc;
if (WSAGetLastError() != EWOULDBLOCK) return winsockerr();
eh = WSACreateEvent();
memset(&ev, 0, sizeof(ev));
if (WSAEventSelect(fh, eh, 1u << eventbit) != -1 &&
WSAEnumNetworkEvents(fh, eh, &ev) != -1) {
if (!ev.iErrorCode[eventbit]) {
rc = 0;
} else {
errno = ev.iErrorCode[eventbit];
}
} else {
winsockerr();
}
WSACloseEvent(eh);
return rc;
}