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