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Overhaul process spawning

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Justine Tunney 2023-09-10 08:12:43 -07:00
parent 99dc1281f5
commit 26e254fb4d
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GPG key ID: BE714B4575D6E328
96 changed files with 1848 additions and 1541 deletions
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33
libc/log/showcrashreports.c
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@ -97,7 +97,7 @@ static void RemoveCrashHandler(void *arg) {
strace_enabled(+1);
}
static void InstallCrashHandler(int sig, sigaction_f thunk, int extraflags) {
static void InstallCrashHandler(int sig, sigaction_f thunk) {
int e;
struct sigaction sa;
struct CrashHandler *ch;
@ -114,7 +114,7 @@ static void InstallCrashHandler(int sig, sigaction_f thunk, int extraflags) {
sigdelset(&sa.sa_mask, SIGABRT);
sigdelset(&sa.sa_mask, SIGBUS);
sigdelset(&sa.sa_mask, SIGURG);
sa.sa_flags = SA_SIGINFO | SA_NODEFER | extraflags;
sa.sa_flags = SA_SIGINFO | SA_ONSTACK;
if (!sigaction(sig, &sa, &ch->old)) {
__cxa_atexit(RemoveCrashHandler, ch, 0);
}
@ -138,24 +138,21 @@ static void InstallCrashHandler(int sig, sigaction_f thunk, int extraflags) {
* useful, for example, if a program is caught in an infinite loop.
*/
void ShowCrashReports(void) {
int ef = 0;
struct sigaltstack ss;
_wantcrashreports = true;
if (!IsWindows()) {
ef = SA_ONSTACK;
struct sigaltstack ss;
ss.ss_flags = 0;
ss.ss_size = GetStackSize();
// FreeBSD sigaltstack() will EFAULT if we use MAP_STACK here
// OpenBSD sigaltstack() auto-applies MAP_STACK to the memory
npassert((ss.ss_sp = _mapanon(GetStackSize())));
npassert(!sigaltstack(&ss, 0));
ss.ss_size = SIGSTKSZ;
ss.ss_sp = malloc(SIGSTKSZ);
sigaltstack(&ss, 0);
__cxa_atexit(free, ss.ss_sp, 0);
}
InstallCrashHandler(SIGQUIT, __got_sigquit, ef); // ctrl+\ aka ctrl+break
InstallCrashHandler(SIGFPE, __got_sigfpe, ef); // 1 / 0
InstallCrashHandler(SIGILL, __got_sigill, ef); // illegal instruction
InstallCrashHandler(SIGSEGV, __got_sigsegv, ef); // bad memory access
InstallCrashHandler(SIGTRAP, __got_sigtrap, ef); // bad system call
InstallCrashHandler(SIGBUS, __got_sigbus, ef); // misalign, mmap i/o failed
InstallCrashHandler(SIGURG, __got_sigurg, ef); // placeholder
InstallCrashHandler(SIGQUIT, __got_sigquit); // ctrl+\ aka ctrl+break
InstallCrashHandler(SIGFPE, __got_sigfpe); // 1 / 0
InstallCrashHandler(SIGILL, __got_sigill); // illegal instruction
InstallCrashHandler(SIGSEGV, __got_sigsegv); // bad memory access
InstallCrashHandler(SIGTRAP, __got_sigtrap); // bad system call
InstallCrashHandler(SIGBUS, __got_sigbus); // misalign, mmap i/o failed
InstallCrashHandler(SIGURG, __got_sigurg); // placeholder
_wantcrashreports = true;
GetSymbolTable();
}