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我正在學習使用setrlimit
和getrlimit
的linux資源控制。這樣做是爲了限制可用於給定過程的存儲器的最大量:setrlimit不能限制最大內存量
#include <sys/resource.h>
#include <sys/time.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main()
{
// Define and object of structure
// rlimit.
struct rlimit rl;
// First get the limit on memory
getrlimit (RLIMIT_AS, &rl);
printf("\n Default value is : %lld\n", (long long int)rl.rlim_cur);
// Change the limit
rl.rlim_cur = 100;
rl.rlim_max = 100;
// Now call setrlimit() to set the
// changed value.
setrlimit (RLIMIT_AS, &rl);
// Again get the limit and check
getrlimit (RLIMIT_AS, &rl);
printf("\n Default value now is : %lld\n", (long long int)rl.rlim_cur);
// Try to allocate more memory than the set limit
char *ptr = NULL;
ptr = (char*) malloc(65536*sizeof(char));
if(NULL == ptr)
{
printf("\n Memory allocation failed\n");
return -1;
}
printf("pass\n");
free(ptr);
return 0;
}
上面的代碼限制存儲器100個字節(包括軟的和硬)。但是,malloc
仍然沒有錯誤返回。代碼有什麼問題嗎?我得到的輸出是:
Default value is : -1
Default value now is : 100
pass