使用setrlimit控制进程使用系统内存

#include <stdio.h>#include <stdlib.h>#include <string.h>#include <sys/resource.h>#include <errno.h>int main(void){int nMemoryLimit = 1024 * 1024 * 5;//5Mstruct rlimit memoryL;getrlimit(RLIMIT_AS, &memoryL);printf("before set mem:%lu,%lu\r\n", (unsigned long)memoryL.rlim_cur, (unsigned long)memoryL.rlim_max);memoryL.rlim_cur = nMemoryLimit;setrlimit(RLIMIT_AS ,&memoryL);getrlimit(RLIMIT_AS, &memoryL);printf("after set mem:%lu,%lu\r\n", (unsigned long)memoryL.rlim_cur, (unsigned long)memoryL.rlim_max);int i = 0;while(1){i++;//当进程内存达到最大值时，malloc calloc返回NULL,记录错误errno=ENOMEMerrno  = 0;char *psString = (char *)calloc(1, 1024);if(NULL == psString){//printf("errno=%d, ENOMEM=%d\r\n", errno, ENOMEM);}else{printf("success, %d\r\n", i);}}return 0;}