MOOC《Linux操作系统编程》学习笔记-实验四

Posted 2021-06-06 努力把握好每一天，只愿成为更好的自己

进程控制实验

实验四 进程控制实验

https://www.icourse163.org/learn/UESTC-1003040002?tid=1455108444#/learn/content?type=detail&id=1228729537&sm=1

 

程序流程图：

 

 试验代码：

  1 #include "stdio.h"
  2 #include "stdint.h"
  3 #include "sys/types.h"
  4 #include "dirent.h"
  5 #include "unistd.h"
  6 #include "string.h"
  7 #include "errno.h"
  8 #include "fcntl.h"
  9 #include <stdlib.h>
 10 #include "sys/wait.h"
 11 #include "sys/stat.h"
 12 
 13 int main(int argc, char* argv[])
 14 {
 15     char buff[256] = {0};
 16 
 17     if(1 == argc)
 18     {
 19         /* 获取当前工作目录 */
 20         if(NULL == getcwd(buff,sizeof(buff)))
 21         {
 22             perror("get work path error");
 23         }
 24         printf("currWorkPath = %s \\n",buff);
 25     }
 26     else if(2 == argc)
 27     {
 28         /* 通过参数获取需要遍历的目录 */
 29         memcpy(buff,argv[1],sizeof(buff));
 30         printf("buff = %s \\n",buff);
 31     }
 32     else
 33     {
 34         printf("cmd para is error \\n");
 35         return 0;
 36     }
 37 
 38     /* 打开目录 */
 39     DIR *currentdir;
 40     if((currentdir = opendir(buff)) == NULL)
 41     {
 42         printf("open directory fail \\n");
 43         return 0;
 44     }
 45     else
 46     {
 47         struct dirent * currentdp;
 48         while((currentdp = readdir(currentdir))!= NULL)
 49         {
 50             if(currentdp->d_name[0] != \'.\')
 51             {
 52                 struct stat currentStat;
 53                 uint8_t tempVar[256] = {0};
 54                 strcat(tempVar,buff);
 55                 strcat(tempVar,"/");
 56                 if(lstat(strcat(tempVar,currentdp->d_name),&currentStat) < 0)
 57                 {
 58                     perror("lstat error");
 59                     printf("error path is %s \\n",currentdp->d_name);
 60                     continue;
 61                 }
 62                 pid_t pid_child,pid_return;
 63                 if(S_ISDIR(currentStat.st_mode)) 
 64                 {
 65                     pid_child = fork();
 66                     if(pid_child < 0) printf("Error occured on forking.\\n");
 67                     else if(pid_child == 0)
 68                     {
 69                         char buffer[256] = {0};
 70                         strcat(buffer,"./");
 71                         execl("./progressTest","progressTest",strcat(buffer,currentdp->d_name),NULL);
 72                         exit(0);
 73                     }
 74                 }
 75                 else
 76                 {
 77                     pid_child = fork();
 78                     if(pid_child < 0) printf("Error occured on forking.\\n");
 79                     else if(pid_child == 0)
 80                     {
 81                         char buffer[256] = {0},buffer2[256] = {0};
 82                         strcat(buffer,"/home/test/Desktop/test/");
 83                         //strcat(buffer,&(buff[2]));
 84                         //strcat(buffer,"/");
 85                         strcat(buffer2,buff);
 86                         strcat(buffer2,"/");
 87                         execl("./test2_1/mycp","mycp",strcat(buffer2,currentdp->d_name),strcat(buffer,currentdp->d_name),NULL);
 88                         exit(0);
 89                     }
 90                 }
 91 
 92                 do{
 93                     pid_return = waitpid(pid_child,NULL,WNOHANG);
 94                 }while(pid_return == 0);
 95                 if(pid_return == pid_child)
 96                     printf("successfullt get child %d\\n",pid_return);
 97                 else
 98                     printf("some error occured\\n");
 99             }
100         }
101     }
102 
103     if(-1 == closedir(currentdir))
104     {
105         printf("close directory fail \\n");
106     }
107     return 0;
108 }

执行结果：

./progressTest
successfullt get child 5436
successfullt get child 5438
successfullt get child 5439
successfullt get child 5440
successfullt get child 5441
successfullt get child 5443
successfullt get child 5435
successfullt get child 5445
successfullt get child 5446
successfullt get child 5448
successfullt get child 5449
successfullt get child 5450
successfullt get child 5451
successfullt get child 5447
successfullt get child 5453
successfullt get child 5454
successfullt get child 5455
successfullt get child 5456
successfullt get child 5457
successfullt get child 5458
successfullt get child 5459
successfullt get child 5460
successfullt get child 5461
successfullt get child 5471
successfullt get child 5452