题目内容

父进程PID是7800，子进程PID是7801＃include ＃include ＃include ＃include ＃include int num=0;int main (int argc,char*argv [] ){int var=0;pid_t pid;if ( (pid=___1_ ) <0)perror("fork error") ;else if (pid ==0)num = 5；elsesleep(1);printf("pid = %d, num = %d\n",2,num);exit(0);}程序输出：3_4

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将子进程写到文件file中的内容读取出来，输出到屏幕上。#include #include #include #include #include #include #include int main(int argc,char* argv[]){pid_t pid;int fd;char * info = "goodbye world";char buf[64] = {0};int nBytes;fd =1;if(fd < 0){perror("open file failed");exit(1);}if((pid =2) < 0){perror("fork error");}else if(pid3){if((nBytes = 4)) < 0){perror("write failed");}exit(0);}else{sleep(1);5；if((nBytes =6)) < 0){perror("read failed");}printf("%s\n",buf);}7；exit(0);}

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自选2个 LOGO静态LOGO+动态LOGO

量值溯源的校准传递链是？

A. 从上往下
B. 从下往上