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Make signal handling work well across platforms

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- Fix sigsuspend() on XNU
- Fix strsignal() on non-Linux
- Add unit tests for strsignal()
- Add unit tests for setitimer()
- Add unit tests for sigsuspend()
- Rewrite setitimer() for New Technology
- Rewrite nanosleep() for New Technology
- Polyfill SIGALRM on the New Technology
- select(0,0,0,0) on NT now calls pause()
- Remove some NTDLL calls that aren't needed
- Polyfill SA_NOCLDWAIT on the New Technology
- Polyfill SA_RESETHAND on the New Technology
- Polyfill sigprocmask() on the New Technology
- Polyfill SIGCHLD+SIG_IGN on the New Technology
- Polyfill SA_RESTART masking on the New Technology
- Deliver console signals from main thread on New Technology
- Document SA_RESTART behavior w/ @sarestartable / @norestart
- System call trace in MODE=dbg now prints inherited FDs and signal mask
This commit is contained in:
Justine Tunney 2022-03-25 07:11:44 -07:00
parent 3b9e66ecba
commit 072e1d2910
82 changed files with 1388 additions and 450 deletions
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38
libc/calls/sigchld-nt.c
View file

@ -16,40 +16,46 @@
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/assert.h"
#include "libc/calls/internal.h"
#include "libc/calls/sig.internal.h"
#include "libc/calls/strace.internal.h"
#include "libc/calls/struct/siginfo.h"
#include "libc/calls/typedef/sigaction_f.h"
#include "libc/nt/enum/status.h"
#include "libc/dce.h"
#include "libc/nt/enum/wait.h"
#include "libc/nt/runtime.h"
#include "libc/nt/synchronization.h"
#include "libc/runtime/runtime.h"
#include "libc/sysv/consts/sa.h"
#include "libc/sysv/consts/sicode.h"
#include "libc/sysv/consts/sig.h"
/**
* Checks to see if SIGCHLD should be raised on Windows.
* @return true if a signal was raised
* @note yoinked by fork-nt.c
*/
bool _check_sigchld(void) {
void _check_sigchld(void) {
siginfo_t si;
int pids[64];
uint32_t i, n;
int64_t handles[64];
if (__sighandrvas[SIGCHLD] < kSigactionMinRva) return false;
if (!(n = __sample_pids(pids, handles))) return false;
if (!(n = __sample_pids(pids, handles, true))) return;
i = WaitForMultipleObjects(n, handles, false, 0);
if (i == kNtWaitTimeout) return false;
if (i == kNtWaitTimeout) return;
if (i == kNtWaitFailed) {
STRACE("%s failed %u", "WaitForMultipleObjects", GetLastError());
return false;
return;
}
STRACE("SIGCHLD fd=%d handle=%ld", pids[i], handles[i]);
bzero(&si, sizeof(si));
si.si_signo = SIGCHLD;
si.si_code = CLD_EXITED;
si.si_pid = pids[i];
((sigaction_f)(_base + __sighandrvas[SIGCHLD]))(SIGCHLD, &si, 0);
return true;
if (__sighandrvas[SIGCHLD] == (intptr_t)SIG_IGN) {
STRACE("killing zombie fd=%d handle=%ld", pids[i], handles[i]);
CloseHandle(handles[i]);
__releasefd(pids[i]);
return;
}
if (__sighandflags[SIGCHLD] & SA_NOCLDWAIT) {
STRACE("SIGCHILD SA_NOCLDWAIT fd=%d handle=%ld", pids[i], handles[i]);
CloseHandle(handles[i]);
__releasefd(pids[i]);
}
g_fds.p[pids[i]].zombie = true;
__sig_add(SIGCHLD, CLD_EXITED);
}