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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
43 lines
2.7 KiB
C
43 lines
2.7 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 2022 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/log/libfatal.internal.h"
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#include "libc/nt/memory.h"
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__msabi extern typeof(VirtualProtectEx) *const __imp_VirtualProtectEx;
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/**
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* Protects memory on the New Technology.
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* @note this wrapper takes care of ABI, STRACE(), and __winerr()
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*/
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textwindows bool32 VirtualProtectEx(int64_t hProcess, void *lpAddress,
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uint64_t dwSize, uint32_t flNewProtect,
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uint32_t *lpflOldProtect) {
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bool32 bOk;
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bOk = __imp_VirtualProtectEx(hProcess, lpAddress, dwSize, flNewProtect,
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lpflOldProtect);
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if (!bOk)
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__winerr();
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NTTRACE("VirtualProtectEx(%ld, %p, %'zu, %s, [%s]) → %hhhd% m", hProcess,
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lpAddress, dwSize, DescribeNtPageFlags(flNewProtect),
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DescribeNtPageFlags(*lpflOldProtect), bOk);
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return bOk;
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}
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