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Overhaul Windows signal handling

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The new asynchronous signal delivery technique is now also being used
for tkill(), raise(), etc. Many subtle issues have been addresesd. We
now signal handling on Windows that's remarkably similar to the POSIX
behaviors. However that's just across threads. We're lacking a way to
have the signal semantics work well, across multiple WIN32 processes.
This commit is contained in:
Justine Tunney 2023-09-08 01:49:41 -07:00
parent 8bdaddd81d
commit 99dc1281f5
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GPG key ID: BE714B4575D6E328
38 changed files with 635 additions and 279 deletions
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22
libc/sock/wsablock.c
View file

@ -17,6 +17,7 @@
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/assert.h"
#include "libc/calls/bo.internal.h"
#include "libc/calls/internal.h"
#include "libc/calls/sig.internal.h"
#include "libc/errno.h"
@ -43,13 +44,13 @@ static textwindows void __wsablock_abort(int64_t handle,
textwindows int __wsablock(struct Fd *fd, struct NtOverlapped *overlapped,
uint32_t *flags, int sigops, uint32_t timeout) {
int abort_errno;
uint32_t i, got;
int rc, abort_errno;
if (WSAGetLastError() != kNtErrorIoPending) {
// our i/o operation never happened because it failed
return __winsockerr();
}
TryAgain:
BEGIN_BLOCKING_OPERATION;
// our i/o operation is in flight and it needs to block
abort_errno = EAGAIN;
if (fd->flags & O_NONBLOCK) {
@ -87,16 +88,13 @@ TryAgain:
// overlapped is allocated on stack by caller, so it's important that
// we wait for win32 to acknowledge that it's done using that memory.
if (WSAGetOverlappedResult(fd->handle, overlapped, &got, true, flags)) {
return got;
}
switch (WSAGetLastError()) {
case kNtErrorIoIncomplete:
goto TryAgain;
case kNtErrorOperationAborted:
rc = got;
} else {
rc = -1;
if (WSAGetLastError() == kNtErrorOperationAborted) {
errno = abort_errno;
break;
default:
break;
}
}
return -1;
END_BLOCKING_OPERATION;
return rc;
}