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#include  <sys/select.h>
#include  <sys/itimer.h>
int getitimer(int which, struct itimerval *value);
int setitimer(int which, const struct itimerval
*value, struct itimerval *ovalue);
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ITIMER_VIRT
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ITIMER_PROF
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SIGPROF
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½á¹¹itimervalÃèÊöÁ˶¨Ê±Æ÷µÄ×é³É£º
struct itimerval
{
struct timeval  it_interval;   /* Ï´ζ¨Ê±È¡Öµ */
struct timeval  it_value;       /* ±¾´Î¶¨Ê±ÉèÖÃÖµ */
}
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struct timeval
{
long    tv_sec;      /* Ã루1000000΢Ã룩 */
long    tv_usec;     /* ΢Ãî */
}
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