catchsig.c

来自「IEC104程序元源代码」· C语言 代码 · 共 49 行

/*******************************************************************************
* This is the skeleton for the signal handling shutdown function - to set up   *
* signal handling for SIGUSR1, just call:                                      *
*                                                                              *
*     init_sighandler( &appl_data );                                           *
*                                                                              *
*  where "appl_data" is a buffer/struct containing data that sighandler()      *
*  can use when it is cleaning up prior to exiting - it is OK for              *
*  you to call init_sighandler() with a NULL pointer - if you do, then         *
*  "static_pappl_data" will be NULL.                                           *
*                                                                              *
*  Add whatever code you want to the sighandler() function to perform          *
*  your application-specific shudown - if you were talking over the            *
*  network (your process called msg_init()), then do NOT forget to call the    *
* "msg_delete()" function to deallocate your network resources.                *
*******************************************************************************/

#include <stdio.h>
#include <signal.h>
#include <sys/types.h>

void     sighandler();
void init_sighandler( );

/* 'static_pappl_data' is a pointer to some data you want to have available
   to sighandler() when it catches SIGUSR1 */

/******************************************************************************/

/* to catch the interrupt signal for shutdown */
void init_sighandler( )
{

/* set up sighandler() as the signal handler for SIGUSR1 */
   (void)signal( SIGUSR1, sighandler );
}

/******************************************************************************/

/* signal handler called when application catches a SIGUSR1 */
void sighandler()
{
/* this is the skeleton for the signal handler - you may do ANY kind of
   cleanup/shutdown processing you desire, just make certain that you
   exit( 0 ) when you are done... */
   msg_delete();
   exit( 0 );
}