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Linux/Unix: ½ø³ÌÎÊÌâ

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                    while(1)

½á¹û¾ÍÂÒÆß°ËÔãÁË£¬²»ÖªµÀÓÐûÓнâ¾ö°ì·¨
C/C++ code:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <signal.h>
#include <stdarg.h>

//global flag used to check whether a signal has occurred or not
volatile sig_atomic_t flag = 0;

//signal sets
sigset_t zeromask, newmask, oldmask;

//error handler
static void errMsg(char *fmt,...){
#define LEN 1024
char buf[LEN];
va_list ptr;
va_start(ptr,fmt);
vsnprintf(buf,LEN,fmt,ptr);
va_end(ptr);
puts(buf);
abort();
}

//signal handlers
static void sigusr1(int signo){
flag = 1;
}

static void sigusr2(int signo){
flag = 1;
}

//signal set initializer
static void sigset_init(){
if((sigemptyset(&zeromask)<0)||(sigemptyset(&oldmask)<0))
errMsg("sigemptyset error");
if(sigfillset(&newmask)<0)
errMsg("sigfillset error"


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