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Improve crash signal reporting on Windows

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This change fixes a bug where exiting a crash signal handler on Windows
after adding the signal to uc_sigmask, but not correcting the CPU state
would cause the signal handler to loop infinitely, causing process hang

Another issue is that very tiny programs, that don't link posix signals
would not have their SIGILL / SIGSEGV / etc. status reported to Cosmo's
bash shell when terminating on crash. That's fixed by a tiny handler in
WinMain() that knows how to map WIN32 crash codes to the POSIX flavors.
This commit is contained in:
Justine Tunney 2024-05-30 13:42:59 -07:00
parent 500a47bc2f
commit cd672e251f
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GPG key ID: BE714B4575D6E328
7 changed files with 169 additions and 88 deletions
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6
libc/calls/sig.internal.h
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@ -1,6 +1,7 @@
#ifndef COSMOPOLITAN_LIBC_CALLS_SIGNALS_INTERNAL_H_
#define COSMOPOLITAN_LIBC_CALLS_SIGNALS_INTERNAL_H_
#include "libc/calls/struct/sigset.h"
#include "libc/nt/struct/ntexceptionpointers.h"
#include "libc/thread/posixthread.internal.h"
#define SIG_HANDLED_NO_RESTART 1
@ -17,11 +18,12 @@ extern struct Signals __sig;
bool __sig_ignored(int);
int __sig_check(void);
int __sig_crash_sig(struct NtExceptionPointers *, int *);
int __sig_get(sigset_t);
int __sig_kill(struct PosixThread *, int, int);
int __sig_mask(int, const sigset_t *, sigset_t *);
int __sig_relay(int, int, sigset_t);
int __sig_raise(int, int);
int __sig_get(sigset_t);
int __sig_relay(int, int, sigset_t);
void __sig_delete(int);
void __sig_generate(int, int);
void __sig_init(void);