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1¡¢alarm
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unsigned int alarm(unsigned int seconds)
º¯Êý˵Ã÷:
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alarm()Ö´Ðк󣬽ø³Ì½«¼ÌÐøÖ´ÐУ¬ÔÚºóÆÚ(alarmÒÔºó)µÄÖ´Ðйý³ÌÖн«»áÔÚ
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#include <unistd.h> //pause alarm
#include <signal.h> //SIGALRM
void sigalrm_fn(int sig)
{
printf("alarm!\n");
alarm(2);
return;
}
int main(void)
{
signal(SIGALRM, sigalrm_fn);
alarm(1);
while(1)
pause();
}
2¡¢setitimer()
int setitimer(int which, const struct
itimerval *value, struct itimerval *ovalue));
setitimer()±Èalarm¹¦ÄÜÇ¿´ó£¬Ö§³Ö3ÖÖÀàÐ͵Ķ¨Ê±Æ÷£º
ITIMER_REAL : ÒÔÏµÍ³ÕæÊµµÄʱ¼äÀ´¼ÆË㣬ËüËͳöSIGALRMÐźš£
ITIMER_VIRTUAL :
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ITIMER_PROF :
ÒԸýø³ÌÔÚÓû§Ì¬ÏºÍÄÚºË̬ÏÂËù·ÑµÄʱ¼äÀ´¼ÆË㣬ËüËͳöSIGPROFÐźš£
setitimer()µÚÒ»¸ö²ÎÊýwhichÖ¸¶¨¶¨Ê±Æ÷ÀàÐÍ£¨ÉÏÃæÈýÖÖÖ®Ò»£©£»µÚ¶þ¸ö²ÎÊýÊÇ
½á¹¹itimervalµÄÒ»¸öʵÀý£»µÚÈý¸ö²ÎÊý¿É²»×ö´¦Àí¡£
setitimer()µ÷Óóɹ¦·µ»Ø0£¬·ñÔò·µ»Ø-1¡£
ÏÂÃæÊǹØÓÚsetitimerµ÷ÓõÄÒ»¸ö¼òµ¥Ê¾·¶£¬ÔÚ¸ÃÀý×ÓÖУ¬Ã¿¸ôÒ»Ãë·¢³öÒ»¸ö
SIGALRM£¬Ã¿¸ô0.5Ãë·¢³öÒ»¸öSIGVTALRMÐźÅ:
#include
#include
#include
#include
#include
#include
int sec;
void sigroutine(int signo){
switch (signo){
case SIGALRM:
printf("Catch a signal -- SIGALRM \n");
signal(SIGALRM, sigroutine);
break;
case SIGVTALRM:
printf("Catch a signal -- SIGVTALRM \n");
signal(SIGVTALRM, sigroutine);
break;
}
return;
}
int main()
{
struct itimerval value, ovalue, value2; //(1)
sec = 5;
printf("process id is %d\n", getpid());
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