105 lines
4.3 KiB
C
105 lines
4.3 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/calls/calls.h"
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#include "libc/calls/internal.h"
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#include "libc/calls/struct/itimerval.h"
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#include "libc/conv/conv.h"
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#include "libc/errno.h"
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#include "libc/log/check.h"
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#include "libc/nexgen32e/nexgen32e.h"
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#include "libc/nt/files.h"
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#include "libc/nt/runtime.h"
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#include "libc/nt/synchronization.h"
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#include "libc/nt/thread.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/itimer.h"
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#include "libc/sysv/errfuns.h"
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/**
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* @fileoverview Heartbreaking polyfill for SIGALRM on NT.
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*
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* Threads are used to trigger the SIGALRM handler, which should
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* hopefully be an unfancy function like this:
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*
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* void OnAlarm(int sig, struct siginfo *si, struct ucontext *uc) {
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* g_alarmed = true;
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* }
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*
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* This is needed because WIN32 provides no obvious solutions for
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* interrupting i/o operations on the standard input handle.
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*/
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static struct ItimerNt {
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int64_t ith;
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uint32_t tid;
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struct itimerval itv;
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} g_itimernt;
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static uint32_t ItimerWorker(void *arg) {
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do {
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if (!WaitForSingleObject(g_itimernt.ith, -1)) {
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__winalarm(NULL, 0, 0);
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}
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} while (g_itimernt.ith && g_itimernt.tid == GetCurrentThreadId());
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return 0;
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}
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textwindows int setitimer$nt(int which, const struct itimerval *newvalue,
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struct itimerval *out_opt_oldvalue) {
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int32_t period;
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int64_t ith, duetime;
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if (which != ITIMER_REAL) return einval();
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if (newvalue) {
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if (newvalue->it_value.tv_sec && newvalue->it_value.tv_usec) {
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if (!(ith = CreateWaitableTimer(NULL, false, NULL))) {
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return winerr();
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}
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duetime = -(newvalue->it_value.tv_sec * HECTONANOSECONDS +
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newvalue->it_value.tv_usec * 10);
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period = newvalue->it_value.tv_sec * 1000 +
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div1000int64(newvalue->it_value.tv_usec);
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if (!period && newvalue->it_value.tv_usec) period = 1;
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if (!SetWaitableTimer(ith, &duetime, period, NULL, NULL, false)) {
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errno = GetLastError();
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CloseHandle(ith);
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return -1;
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}
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} else {
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ith = 0;
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}
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if (g_itimernt.ith) {
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CloseHandle(g_itimernt.ith);
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g_itimernt.ith = 0;
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}
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} else {
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ith = 0;
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}
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if (out_opt_oldvalue) {
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memcpy(out_opt_oldvalue, &g_itimernt.itv, sizeof(struct itimerval));
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}
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if (ith) {
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g_itimernt.ith = ith;
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memcpy(&g_itimernt.itv, newvalue, sizeof(struct itimerval));
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CloseHandle(
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CreateThread(NULL, STACKSIZE, ItimerWorker, NULL, 0, &g_itimernt.tid));
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}
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return 0;
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}
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