mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-07 15:03:34 +00:00
29eb7e67bb
Recent optimizations to fork() introduced a regression, that could cause the subprocess to fail unexpectedly, when TlsAlloc() returns a different index. This is because we were burning the indexes into the displacement of x86 opcodes. So when fork() happened and the executable memory copied it would use the old index. Right now the way this is being solved is to not copy the executable on fork() and then re-apply code changes. If you need to be able to preserve self-modified code on fork, reach out and we can implement a better solution for you. This gets us unblocked quickly.
94 lines
3.9 KiB
C
94 lines
3.9 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 2023 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/internal.h"
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#include "libc/calls/struct/sigset.internal.h"
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#include "libc/nt/errors.h"
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#include "libc/nt/events.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/struct/overlapped.h"
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#include "libc/str/str.h"
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#include "libc/str/tab.h"
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#include "third_party/linenoise/linenoise.h"
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#define Read32(s) (s[3] << 24 | s[2] << 16 | s[1] << 8 | s[0])
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#define EXT(s) Read32(s "\0\0")
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static inline bool IsGraph(wint_t c) {
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return 0x21 <= c && c <= 0x7E;
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}
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static uint32_t GetFileExtension(const char16_t *s) {
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uint32_t w;
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size_t i, n;
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n = s ? strlen16(s) : 0;
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for (i = w = 0; n--;) {
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wint_t c = s[n];
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if (!IsGraph(c))
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return 0;
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if (c == '.')
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break;
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if (++i > 4)
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return 0;
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w <<= 8;
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w |= kToLower[c];
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}
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return w;
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}
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// checks if file should be considered an executable on windows
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textwindows int IsWindowsExecutable(int64_t handle, const char16_t *path) {
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// fast path known file extensions
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// shaves away 100ms of gnu make latency in cosmo monorepo
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uint32_t ext;
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if (!IsTiny() && (ext = GetFileExtension(path))) {
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if (ext == EXT("c") || // c code
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ext == EXT("cc") || // c++ code
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ext == EXT("h") || // c/c++ header
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ext == EXT("s") || // assembly code
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ext == EXT("o")) { // object file
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return false;
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}
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if (ext == EXT("com") || // mz executable
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ext == EXT("exe") || // mz executable
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ext == EXT("sh")) { // bourne shells
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return true;
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}
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}
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// read first two bytes of file
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// access() and stat() aren't cancelation points
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bool ok;
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char buf[2];
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uint32_t got;
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BLOCK_SIGNALS;
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struct NtOverlapped overlap = {.hEvent = CreateEvent(0, 0, 0, 0)};
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ok = overlap.hEvent &&
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(ReadFile(handle, buf, 2, 0, &overlap) ||
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GetLastError() == kNtErrorIoPending) &&
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GetOverlappedResult(handle, &overlap, &got, true);
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CloseHandle(overlap.hEvent);
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ALLOW_SIGNALS;
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// it's an executable if it starts with `MZ` or `#!`
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return ok && got == 2 && //
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((buf[0] == 'M' && buf[1] == 'Z') || //
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(buf[0] == '#' && buf[1] == '!'));
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}
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