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https://github.com/jart/cosmopolitan.git
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0b3c81dd4e
This change makes fork() go nearly as fast as sys_fork() on UNIX. As for Windows this change shaves about 4-5ms off fork() + wait() latency. This is accomplished by using WriteProcessMemory() from the parent process to setup the address space of a suspended process; it is better than a pipe
50 lines
3 KiB
C
50 lines
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 et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2024 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/syscall_support-nt.internal.h"
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#include "libc/intrin/describeflags.h"
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#include "libc/intrin/strace.h"
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#include "libc/macros.h"
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#include "libc/mem/alloca.h"
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#include "libc/nt/enum/memflags.h"
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#include "libc/nt/memory.h"
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#include "libc/nt/thunk/msabi.h"
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__msabi extern typeof(VirtualAllocEx) *const __imp_VirtualAllocEx;
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static const char *DescribeAllocationType(char buf[48], uint32_t x) {
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const struct DescribeFlags kAllocationTypeFlags[] = {
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{kNtMemCommit, "Commit"}, //
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{kNtMemReserve, "Reserve"}, //
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{kNtMemReset, "Reset"}, //
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};
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return _DescribeFlags(buf, 48, kAllocationTypeFlags,
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ARRAYLEN(kAllocationTypeFlags), "kNtMem", x);
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}
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void *VirtualAllocEx(int64_t hProcess, void *lpAddress, uint64_t dwSize,
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uint32_t flAllocationType, uint32_t flProtect) {
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void *res = __imp_VirtualAllocEx(hProcess, lpAddress, dwSize,
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flAllocationType, flProtect);
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if (!res)
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__winerr();
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NTTRACE("VirtualAllocEx(%ld, %p, %'lu, %s, %s) → %p% m", hProcess, lpAddress,
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dwSize, DescribeAllocationType(alloca(48), flAllocationType),
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DescribeNtPageFlags(flProtect), res);
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return res;
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}
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