/*-*- 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 │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/assert.h"
#include "libc/bits/weaken.h"
#include "libc/calls/calls.h"
#include "libc/calls/internal.h"
#include "libc/calls/ntspawn.h"
#include "libc/fmt/itoa.h"
#include "libc/macros.internal.h"
#include "libc/nexgen32e/nt2sysv.h"
#include "libc/nt/dll.h"
#include "libc/nt/enum/filemapflags.h"
#include "libc/nt/enum/pageflags.h"
#include "libc/nt/enum/startf.h"
#include "libc/nt/enum/wt.h"
#include "libc/nt/ipc.h"
#include "libc/nt/memory.h"
#include "libc/nt/process.h"
#include "libc/nt/runtime.h"
#include "libc/nt/signals.h"
#include "libc/nt/synchronization.h"
#include "libc/nt/thread.h"
#include "libc/runtime/directmap.internal.h"
#include "libc/runtime/memtrack.h"
#include "libc/runtime/runtime.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/map.h"
#include "libc/sysv/consts/o.h"
#include "libc/sysv/consts/prot.h"
#include "libc/sysv/consts/sig.h"
#include "libc/sysv/errfuns.h"
static textwindows noasan char16_t *ParseInt(char16_t *p, int64_t *x) {
*x = 0;
while (*p == ' ') p++;
while ('0' <= *p && *p <= '9') {
*x *= 10;
*x += *p++ - '0';
}
return p;
}
static noinline textwindows noasan void ForkIo(int64_t h, void *buf, size_t n,
bool32 (*f)()) {
char *p;
size_t i;
uint32_t x;
for (p = buf, i = 0; i < n; i += x) {
f(h, p + i, n - i, &x, NULL);
}
}
static noinline textwindows noasan void WriteAll(int64_t h, void *buf,
size_t n) {
ForkIo(h, buf, n, WriteFile);
}
static textwindows noinline noasan void ReadAll(int64_t h, void *buf,
size_t n) {
ForkIo(h, buf, n, ReadFile);
}
textwindows noasan void WinMainForked(void) {
void *addr;
jmp_buf jb;
uint64_t size;
uint32_t i, varlen;
struct DirectMap dm;
int64_t reader, writer;
char16_t var[21 + 1 + 21 + 1];
varlen = GetEnvironmentVariable(u"_FORK", var, ARRAYLEN(var));
if (!varlen) return;
if (varlen >= ARRAYLEN(var)) ExitProcess(123);
SetEnvironmentVariable(u"_FORK", NULL);
ParseInt(ParseInt(var, &reader), &writer);
ReadAll(reader, jb, sizeof(jb));
ReadAll(reader, &_mmi.i, sizeof(_mmi.i));
for (i = 0; i < _mmi.i; ++i) {
ReadAll(reader, &_mmi.p[i], sizeof(_mmi.p[i]));
addr = (void *)((uint64_t)_mmi.p[i].x << 16);
size = ((uint64_t)(_mmi.p[i].y - _mmi.p[i].x) << 16) + FRAMESIZE;
if (_mmi.p[i].flags & MAP_PRIVATE) {
CloseHandle(_mmi.p[i].h);
_mmi.p[i].h =
sys_mmap_nt(addr, size, _mmi.p[i].prot, _mmi.p[i].flags, -1, 0)
.maphandle;
ReadAll(reader, addr, size);
} else {
MapViewOfFileExNuma(
_mmi.p[i].h,
(_mmi.p[i].prot & PROT_WRITE)
? kNtFileMapWrite | kNtFileMapExecute | kNtFileMapRead
: kNtFileMapExecute | kNtFileMapRead,
0, 0, size, addr, kNtNumaNoPreferredNode);
}
}
ReadAll(reader, _edata, _end - _edata);
CloseHandle(reader);
CloseHandle(writer);
if (weaken(__wincrash_nt)) {
AddVectoredExceptionHandler(1, (void *)weaken(__wincrash_nt));
}
longjmp(jb, 1);
}
textwindows int sys_fork_nt(void) {
jmp_buf jb;
char exe[PATH_MAX];
int64_t reader, writer;
int i, rc, pid, releaseme;
char *p, forkvar[6 + 21 + 1 + 21 + 1];
struct NtStartupInfo startinfo;
struct NtProcessInformation procinfo;
if ((pid = releaseme = __reservefd()) == -1) return -1;
if (!setjmp(jb)) {
if (CreatePipe(&reader, &writer, &kNtIsInheritable, 0)) {
p = stpcpy(forkvar, "_FORK=");
p += uint64toarray_radix10(reader, p);
*p++ = ' ';
p += uint64toarray_radix10(writer, p);
memset(&startinfo, 0, sizeof(startinfo));
startinfo.cb = sizeof(struct NtStartupInfo);
startinfo.dwFlags = kNtStartfUsestdhandles;
startinfo.hStdInput = g_fds.p[0].handle;
startinfo.hStdOutput = g_fds.p[1].handle;
startinfo.hStdError = g_fds.p[2].handle;
GetModuleFileNameA(0, exe, ARRAYLEN(exe));
if (ntspawn(exe, __argv, environ, forkvar, &kNtIsInheritable, NULL, true,
0, NULL, &startinfo, &procinfo) != -1) {
CloseHandle(reader);
CloseHandle(procinfo.hThread);
if (weaken(__sighandrvas) &&
weaken(__sighandrvas)[SIGCHLD] == SIG_IGN) {
CloseHandle(procinfo.hProcess);
} else {
g_fds.p[pid].kind = kFdProcess;
g_fds.p[pid].handle = procinfo.hProcess;
g_fds.p[pid].flags = O_CLOEXEC;
releaseme = -1;
}
WriteAll(writer, jb, sizeof(jb));
WriteAll(writer, &_mmi.i, sizeof(_mmi.i));
for (i = 0; i < _mmi.i; ++i) {
WriteAll(writer, &_mmi.p[i], sizeof(_mmi.p[i]));
if (_mmi.p[i].flags & MAP_PRIVATE) {
WriteAll(writer, (void *)((uint64_t)_mmi.p[i].x << 16),
((uint64_t)(_mmi.p[i].y - _mmi.p[i].x) << 16) + FRAMESIZE);
}
}
WriteAll(writer, _edata, _end - _edata);
CloseHandle(writer);
} else {
rc = -1;
}
rc = pid;
} else {
rc = __winerr();
}
} else {
rc = 0;
}
if (releaseme != -1) {
__releasefd(releaseme);
}
return rc;
}