Adding upstream version 15.4.upstream/15.4upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 97 insertions, 0 deletions

diff --git a/src/port/kill.c b/src/port/kill.c
new file mode 100644
index 0000000..ff08626
--- /dev/null
+++ b/src/port/kill.c
@@ -0,0 +1,97 @@
+/*-------------------------------------------------------------------------
+ *
+ * kill.c
+ *	  kill()
+ *
+ * Copyright (c) 1996-2022, PostgreSQL Global Development Group
+ *
+ *	This is a replacement version of kill for Win32 which sends
+ *	signals that the backend can recognize.
+ *
+ * IDENTIFICATION
+ *	  src/port/kill.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "c.h"
+
+#ifdef WIN32
+/* signal sending */
+int
+pgkill(int pid, int sig)
+{
+	char		pipename[128];
+	BYTE		sigData = sig;
+	BYTE		sigRet = 0;
+	DWORD		bytes;
+
+	/* we allow signal 0 here, but it will be ignored in pg_queue_signal */
+	if (sig >= PG_SIGNAL_COUNT || sig < 0)
+	{
+		errno = EINVAL;
+		return -1;
+	}
+	if (pid <= 0)
+	{
+		/* No support for process groups */
+		errno = EINVAL;
+		return -1;
+	}
+
+	/* special case for SIGKILL: just ask the system to terminate the target */
+	if (sig == SIGKILL)
+	{
+		HANDLE		prochandle;
+
+		if ((prochandle = OpenProcess(PROCESS_TERMINATE, FALSE, (DWORD) pid)) == NULL)
+		{
+			errno = ESRCH;
+			return -1;
+		}
+		if (!TerminateProcess(prochandle, 255))
+		{
+			_dosmaperr(GetLastError());
+			CloseHandle(prochandle);
+			return -1;
+		}
+		CloseHandle(prochandle);
+		return 0;
+	}
+	snprintf(pipename, sizeof(pipename), "\\\\.\\pipe\\pgsignal_%u", pid);
+
+	if (CallNamedPipe(pipename, &sigData, 1, &sigRet, 1, &bytes, 1000))
+	{
+		if (bytes != 1 || sigRet != sig)
+		{
+			errno = ESRCH;
+			return -1;
+		}
+		return 0;
+	}
+
+	switch (GetLastError())
+	{
+		case ERROR_BROKEN_PIPE:
+		case ERROR_BAD_PIPE:
+
+			/*
+			 * These arise transiently as a process is exiting.  Treat them
+			 * like POSIX treats a zombie process, reporting success.
+			 */
+			return 0;
+
+		case ERROR_FILE_NOT_FOUND:
+			/* pipe fully gone, so treat the process as gone */
+			errno = ESRCH;
+			return -1;
+		case ERROR_ACCESS_DENIED:
+			errno = EPERM;
+			return -1;
+		default:
+			errno = EINVAL;		/* unexpected */
+			return -1;
+	}
+}
+
+#endif