文件IO操作（08）——stat函数(2)

fstat函数输出三个标准文件流的stat信息

STDIN_FILENO、STDOUT_FILENO、STDERR_FILENO的信息

 

   1: #include <sys/types.h>

   2: #include <sys/stat.h>

   3: #include <unistd.h>

   4: #include <stdio.h>

   5: #include <stdlib.h>

   6: #include <string.h>

   7: #include <errno.h>

   8: #include <time.h>

   9:     

  10: //       int stat(const char *path, struct stat *buf);

  11:  

  12: void fstat_show(int fd)

  13: {

  14:  

  15:     struct stat buf;

  16:     if(0==fstat(fd,&buf)){

  17:         printf("文件fd:\"%d\"\n",fd);

  18:         printf("大小:%ld\t\t块:%ld\t\tIO块:%ld\n设备：%ldh/%ldd\t\tInode：%ld\t\t硬链接：%ld\n",

  19:             buf.st_size,buf.st_blocks,buf.st_blksize,0,buf.st_dev,

  20:             buf.st_ino,buf.st_nlink);

  21:         printf("权限:(0%o/",buf.st_mode & 0777);

  22:         if(buf.st_mode & S_IFDIR){

  23:             printf("d");

  24:         }else{

  25:             printf("-");

  26:         }

  27:         if(buf.st_mode & S_IRUSR){

  28:             printf("r");

  29:         }else{

  30:             printf("-");

  31:         }

  32:         if(buf.st_mode & S_IWUSR){

  33:             printf("w");

  34:         }else{

  35:             printf("-");

  36:         }

  37:         if(buf.st_mode & S_IXUSR){

  38:             printf("x");

  39:         }else{

  40:             printf("-");

  41:         }

  42:         if(buf.st_mode & S_IRGRP){

  43:             printf("r");

  44:         }else{

  45:             printf("-");

  46:         }

  47:         if(buf.st_mode & S_IWGRP){

  48:             printf("w");

  49:         }else{

  50:             printf("-");

  51:         }

  52:         if(buf.st_mode & S_IXGRP){

  53:             printf("x");

  54:         }else{

  55:             printf("-");

  56:         }

  57:         if(buf.st_mode & S_IROTH){

  58:             printf("r");

  59:         }else{

  60:             printf("-");

  61:         }

  62:         if(buf.st_mode & S_IWOTH){

  63:             printf("w");

  64:         }else{

  65:             printf("-");

  66:         }

  67:         if(buf.st_mode & S_IXOTH){

  68:             printf("x");

  69:         }else{

  70:             printf("-");

  71:         }

  72:  

  73:         printf(")\tUid:( %ld )\tGid:( %ld )\n",buf.st_uid,buf.st_gid);

  74:         struct tm tm_tmp;

  75:         localtime_r(&(buf.st_atime),&tm_tmp);

  76:         printf("最近访问:%s",asctime(&tm_tmp));

  77:         

  78:         localtime_r(&(buf.st_mtime),&tm_tmp);

  79:         printf("最近更改:%s",asctime(&tm_tmp));

  80:  

  81:         localtime_r(&(buf.st_ctime),&tm_tmp);

  82:         printf("最近改动:%s",asctime(&tm_tmp));

  83:  

  84:  

  85:     }else{

  86:         perror("error ");

  87:     }

  88: }

  89:  

  90:  

  91: //===========================================================

  92:  

  93:  

  94: int main(int argc,char* argv[])

  95: {

  96:     fstat_show(STDIN_FILENO);   

  97:     fstat_show(STDOUT_FILENO);  

  98:     fstat_show(STDERR_FILENO);  

  99:  

 100:     return 0;

 101: }

调用system函数来输出

 

   1: #include <stdlib.h>

   2: #include <sys/types.h>

   3: #include <sys/stat.h>

   4: #include <unistd.h>

   5:  

   6: int main()

   7: {

   8:     puts("STDIN_FILENO");

   9:     //int mypid=getpid();

  10:     //char cmd[256]={0};

  11:     

  12:     system("stat /dev/pts/1");

  13:  

  14:     //puts("STDOUT_FILENO");

  15:     //puts("STDERR_FILENO");

  16:     return 0;

  17: }