linux程序无法获取cpu资源,Linux系统编程获取系统的CPU资源

还是纯干货，代码拿来：

#include

#include

#include

#include

#include

#include

#include

void work()

{

FILE *f;

int i;

double x = 4.5;

f = tmpfile();

for(i = 0; i < 10000;i++)

{

fprintf(f,"Do some output\n");

if (ferror(f))

{

fprintf(stderr,"Error writing to temporary file\n");

exit(1);

}

}

for (i =0; i < 1000000; i++)

x = log(x*x + 3.21);

}

int main()

{

struct rusage r_usage;

struct rlimit r_limit;

int priority;

work();

getrusage(RUSAGE_SELF, &r_usage);

printf("CPU usage: User = %ld.%6ld, System = %ld.%06ld\n",r_usage.ru_utime.tv_sec,r_usage.ru_utime.tv_usec,r_usage.ru_stime.tv_sec,r_usage.ru_stime.tv_usec);

priority = getpriority(PRIO_PROCESS, getpid());

printf("Current priority = %d\n", priority);

getrlimit(RLIMIT_FSIZE, &r_limit);

printf("Current FSIZE limit: soft = %ld, hard = %ld\n", r_limit.rlim_cur, r_limit.rlim_max);

r_limit.rlim_cur = 2048;

r_limit.rlim_max = 4096;

printf("Setting a 2K file size limit\n");

setrlimit(RLIMIT_FSIZE, &r_limit);

work();

exit(0);

}效果如图所示：