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Make execve() linger when it can't spoof parent

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It's now possible to use execve() when the parent process isn't built by
cosmo. In such cases, the current process will kill all threads and then
linger around, waiting for the newly created process to die, and then we
propagate its exit code to the parent. This should help bazel and others

Allocating private anonymous memory is now 5x faster on Windows. This is
thanks to VirtualAlloc() which is faster than the file mapping APIs. The
fork() function also now goes 30% faster, since we are able to avoid the
VirtualProtect() calls on mappings in most cases now.

Fixes #1253
This commit is contained in:
Justine Tunney 2025-01-04 21:11:53 -08:00
parent c97a858470
commit 42a3bb729a
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GPG key ID: BE714B4575D6E328
40 changed files with 612 additions and 656 deletions
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7
libc/intrin/sig.c
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@ -83,7 +83,7 @@ struct SignalFrame {
};
__msabi extern typeof(GetStdHandle) *const __imp_GetStdHandle;
__msabi extern typeof(VirtualProtect) *const __imp_VirtualProtect;
__msabi extern typeof(VirtualProtectEx) *const __imp_VirtualProtectEx;
__msabi extern typeof(VirtualQuery) *const __imp_VirtualQuery;
__msabi extern typeof(WriteFile) *const __imp_WriteFile;
@ -566,8 +566,9 @@ textwindows wontreturn static void __sig_death(int sig, const char *thing) {
//
forceinline void __sig_reguard(void *page) {
uint32_t old_protect;
__imp_VirtualProtect((void *)((uintptr_t)page & -__pagesize), __pagesize,
kNtPageReadwrite | kNtPageGuard, &old_protect);
__imp_VirtualProtectEx(GetCurrentProcess(),
(void *)((uintptr_t)page & -__pagesize), __pagesize,
kNtPageReadwrite | kNtPageGuard, &old_protect);
}
// trampoline for calling signal handler when system reports crash