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/*-------------------------------------------------------------------------
*
* kill.c
* kill()
*
* Copyright (c) 1996-2021, 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
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