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/*-------------------------------------------------------------------------
*
* kill.c
* kill()
*
* Copyright (c) 1996-2010, PostgreSQL Global Development Group
*
* This is a replacement version of kill for Win32 which sends
* signals that the backend can recognize.
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/port/kill.c,v 1.13 2010/01/02 16:58:13 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#include "c.h"
#ifdef WIN32
/* signal sending */
int
pgkill(int pid, int sig)
{
char pipename[128];
BYTE sigData = sig;
BYTE sigRet = 0;
DWORD bytes;
int pipe_tries;
/* 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;
}
snprintf(pipename, sizeof(pipename), "\\\\.\\pipe\\pgsignal_%u", pid);
/*
* Writing data to the named pipe can fail for transient reasons.
* Therefore, it is useful to retry if it fails. The maximum number of
* calls to make was empirically determined from a 90-hour notification
* stress test.
*/
for (pipe_tries = 0; pipe_tries < 3; pipe_tries++)
{
if (CallNamedPipe(pipename, &sigData, 1, &sigRet, 1, &bytes, 1000))
{
if (bytes != 1 || sigRet != sig)
{
errno = ESRCH;
return -1;
}
return 0;
}
}
if (GetLastError() == ERROR_FILE_NOT_FOUND)
errno = ESRCH;
else if (GetLastError() == ERROR_ACCESS_DENIED)
errno = EPERM;
else
errno = EINVAL;
return -1;
}
#endif
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