/*---------------------------------------------------------------  * Copyright (c) 1999,2000,2001,2002,2003                            * The Board of Trustees of the University of Illinois             * All Rights Reserved.                                            *---------------------------------------------------------------  * Permission is hereby granted, free of charge, to any person     * obtaining a copy of this software (Iperf) and associated        * documentation files (the "Software"), to deal in the Software   * without restriction, including without limitation the           * rights to use, copy, modify, merge, publish, distribute,         * sublicense, and/or sell copies of the Software, and to permit      * persons to whom the Software is furnished to do * so, subject to the following conditions:  * *      * Redistributions of source code must retain the above  * copyright notice, this list of conditions and  * the following disclaimers.  * *      * Redistributions in binary form must reproduce the above  * copyright notice, this list of conditions and the following  * disclaimers in the documentation and/or other materials  * provided with the distribution.  *  *      * Neither the names of the University of Illinois, NCSA,  * nor the names of its contributors may be used to endorse  * or promote products derived from this Software without * specific prior written permission.  *  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES  * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND  * NONINFRINGEMENT. IN NO EVENT SHALL THE CONTIBUTORS OR COPYRIGHT  * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,  * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  * ________________________________________________________________ * National Laboratory for Applied Network Research  * National Center for Supercomputing Applications  * University of Illinois at Urbana-Champaign  * http://www.ncsa.uiuc.edu * ________________________________________________________________  * * signal.c * by Mark Gates <mgates@nlanr.net> * ------------------------------------------------------------------- * standard signal installer * ------------------------------------------------------------------- */#include "headers.h"#include "util.h"#ifdef __cplusplusextern "C" {#endif#ifdef WIN32/* list of signal handlers. _NSIG is number of signals defined. */static SigfuncPtr handlers[ _NSIG ] = { 0};/* ------------------------------------------------------------------- * sig_dispatcher * * dispatches the signal to appropriate signal handler. This emulates * the signal handling of Unix. * * ------------------------------------------------------------------- */BOOL WINAPI sig_dispatcher( DWORD type ) {    SigfuncPtr h = NULL;    int signo;    switch ( type ) {        case CTRL_C_EVENT:            signo = SIGINT;            h = handlers[ SIGINT ];            break;        case CTRL_CLOSE_EVENT:        case CTRL_LOGOFF_EVENT:        case CTRL_SHUTDOWN_EVENT:            signo = SIGTERM;            h = handlers[ SIGTERM ];            break;        default:            break;    }    if ( h != NULL ) {        // call the signal handler        h( signo );        return true;    } else {        return false;    }}/* ------------------------------------------------------------------- * my_signal * * installs a  signal handler. I emulate Unix signals by storing the * function pointers and dispatching events myself, using the * sig_dispatcher above. * ------------------------------------------------------------------- */SigfuncPtr my_signal( int inSigno, SigfuncPtr inFunc ) {    SigfuncPtr old = NULL;    if ( inSigno >= 0  &&  inSigno < _NSIG ) {        old = handlers[ inSigno ];        handlers[ inSigno ] = inFunc;    }    return old;} /* end my_signal */#else /* not WIN32 *//* ------------------------------------------------------------------- * my_signal * * installs a signal handler, and returns the old handler. * This emulates the semi-standard signal() function in a * standard way using the Posix sigaction function. * * from Stevens, 1998, section 5.8 * ------------------------------------------------------------------- */SigfuncPtr my_signal( int inSigno, SigfuncPtr inFunc ) {    struct sigaction theNewAction, theOldAction;    assert( inFunc != NULL );    theNewAction.sa_handler = inFunc;    sigemptyset( &theNewAction.sa_mask );    theNewAction.sa_flags = 0;    if ( inSigno == SIGALRM ) {#ifdef SA_INTERRUPT        theNewAction.sa_flags |= SA_INTERRUPT;  /* SunOS 4.x */#endif    } else {#ifdef SA_RESTART        theNewAction.sa_flags |= SA_RESTART;    /* SVR4, 4.4BSD */#endif    }    if ( sigaction( inSigno, &theNewAction, &theOldAction ) < 0 ) {        return SIG_ERR;    } else {        return theOldAction.sa_handler;    }} /* end my_signal */#endif /* not WIN32 *//* ------------------------------------------------------------------- * sig_exit * * Quietly exits. This protects some against being called multiple * times. (TODO: should use a mutex to ensure (num++ == 0) is atomic.) * ------------------------------------------------------------------- */void sig_exit( int inSigno ) {    static int num = 0;    if ( num++ == 0 ) {        fflush( 0 );        exit( 0 );    }} /* end sig_exit */#ifdef __cplusplus} /* end extern "C" */#endif