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Introduce interprocess signaling on Windows

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This change gets rsync working without any warning or errors. On Windows
we now create a bunch of C:\var\sig\x\y.pid shared memory files, so sigs
can be delivered between processes. WinMain() creates this file when the
process starts. If the program links signaling system calls then we make
a thread at startup too, which allows asynchronous delivery each quantum
and cancelation points can spot these signals potentially faster on wait

See #1240
This commit is contained in:
Justine Tunney 2024-09-19 03:02:13 -07:00
parent 8527462b95
commit 0d74673213
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GPG key ID: BE714B4575D6E328
22 changed files with 302 additions and 62 deletions
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20
libc/intrin/terminatethisprocess.c
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@ -16,8 +16,16 @@
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/atomic.h"
#include "libc/calls/sig.internal.h"
#include "libc/intrin/kprintf.h"
#include "libc/limits.h"
#include "libc/nt/files.h"
#include "libc/nt/memory.h"
#include "libc/nt/runtime.h"
#include "libc/nt/thunk/msabi.h"
#include "libc/runtime/internal.h"
#ifdef __x86_64__
__msabi extern typeof(TerminateProcess) *const __imp_TerminateProcess;
@ -25,8 +33,20 @@ __msabi extern typeof(TerminateProcess) *const __imp_TerminateProcess;
* Terminates the calling process and all of its threads.
*/
textwindows dontinstrument void TerminateThisProcess(uint32_t dwWaitStatus) {
// delete sig file
char16_t path[128];
atomic_ulong *real;
atomic_ulong fake = 0;
real = __sig.process;
__sig.process = &fake;
UnmapViewOfFile(real);
DeleteFile(__sig_process_path(path, __pid));
// "When a process terminates itself, TerminateProcess stops execution
// of the calling thread and does not return." -Quoth MSDN
__imp_TerminateProcess(-1, dwWaitStatus);
__builtin_unreachable();
}
#endif /* __x86_64__ */