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2e371183ee
since it can be transient failures, causing kill() to not properly send signals. Original patch from Steve Marshall, modified by me.
72 lines
1.6 KiB
C
72 lines
1.6 KiB
C
/*-------------------------------------------------------------------------
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*
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* kill.c
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* kill()
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*
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* Copyright (c) 1996-2009, PostgreSQL Global Development Group
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*
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* This is a replacement version of kill for Win32 which sends
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* signals that the backend can recognize.
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/port/kill.c,v 1.12 2009/02/15 13:58:18 mha Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#include "c.h"
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#ifdef WIN32
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/* signal sending */
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int
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pgkill(int pid, int sig)
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{
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char pipename[128];
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BYTE sigData = sig;
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BYTE sigRet = 0;
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DWORD bytes;
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int pipe_tries;
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/* we allow signal 0 here, but it will be ignored in pg_queue_signal */
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if (sig >= PG_SIGNAL_COUNT || sig < 0)
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{
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errno = EINVAL;
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return -1;
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}
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if (pid <= 0)
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{
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/* No support for process groups */
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errno = EINVAL;
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return -1;
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}
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snprintf(pipename, sizeof(pipename), "\\\\.\\pipe\\pgsignal_%u", pid);
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/*
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* Writing data to the named pipe can fail for transient reasons.
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* Therefore, it is useful to retry if it fails. The maximum number of
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* calls to make was empirically determined from a 90-hour notification
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* stress test.
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*/
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for (pipe_tries = 0; pipe_tries < 3; pipe_tries++)
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{
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if (CallNamedPipe(pipename, &sigData, 1, &sigRet, 1, &bytes, 1000))
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{
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if (bytes != 1 || sigRet != sig)
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{
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errno = ESRCH;
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return -1;
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}
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return 0;
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}
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}
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if (GetLastError() == ERROR_FILE_NOT_FOUND)
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errno = ESRCH;
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else if (GetLastError() == ERROR_ACCESS_DENIED)
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errno = EPERM;
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else
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errno = EINVAL;
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return -1;
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}
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#endif
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