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alarm
Èç¹û²»ÒªÇóºÜ¾«È·µÄ»°£¬Óà alarm() ºÍ signal() ¾Í¹»ÁË
unsigned int alarm(unsigned int seconds)
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#include <stdio.h>
#include <unistd.h>
#include <signal.h>
void sigalrm_fn(int sig)
{
/* Do something */
printf("alarm!\n");
alarm(2);
return;
}
int main(void)
{
signal(SIGALRM, sigalrm_fn);
alarm(2);
/* Do someting */
while(1) pause();
}
2. setitimer
int setitimer(int which, const struct itimerval *value, struct itimerval *ovalue));
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ITIMER_VIRTUAL : ÒÔ¸ÃÐгÌÕæÕýÓÐÖ´ÐеÄʱ¼äÀ´¼ÆËã£
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