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《CSAPP》（第3版）答案（第十章）

P6

fd=4

P7

#include 
   
    #include "csapp.h"int main(int argc, char* argv[]) {
     int n;  char buf[MAXBUF];  while ((n = Rio_readn(STDIN_FILENO, buf, MAXBUF)) != 0)    Rio_writen(STDOUT_FILENO, buf, n);      return 0;}
   

P8

#include 
   
    #include "csapp.h"int main(int argc, char* argv[]) {
     struct stat stat;  char *type, *readok;  int fd;    if (argc <= 1)    fd = 0; // stdin  else    fd = atoi(argv[1]);  Fstat(fd, &stat);    if (S_ISREG(stat.st_mode))    type = "regular";  else if (S_ISDIR(stat.st_mode))    type = "dir";  else    type = "other";      if ((stat.st_mode & S_IRUSR))    readok = "yes";  else    readok = "no";      printf("type: %s, read: %s\n", type, readok);  return 0;}
   

P9

if (Fork() == 0) {
     Dup2(0, 3);  Execve("fstatcheck", argv, envp);}

P10

#include 
   
    #include "csapp.h"int main(int argc, char* argv[]) {
     int n;  rio_t rio;  char buf[MAXLINE];    if (argc == 2) {
       int fd = Open(argv[1], O_RDONLY, 0);    while ((n = Rio_readn(fd, buf, MAXBUF)) != 0)      Rio_writen(STDOUT_FILENO, buf, n);    exit(0);  }    Rio_readinitb(&rio, STDIN_FILENO);    while ((n = Rio_readlineb(&rio, buf, MAXLINE)) != 0)    Rio_writen(STDOUT_FILENO, buf, n);  return 0;}
   

第十章 完

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