kill.c

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/*-------------------------------------------------------------------------
 *
 * kill.c
 *    kill()
 *
 * Copyright (c) 1996-2013, 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;
    }
    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;
    }

    if (GetLastError() == ERROR_FILE_NOT_FOUND)
        errno = ESRCH;
    else if (GetLastError() == ERROR_ACCESS_DENIED)
        errno = EPERM;
    else
        errno = EINVAL;
    return -1;
}

#endif