Directory operations in Linux <1>

I. Permissions for the directory

(1) The directory file access rights are divided into three groups, respectively, the owner, the user, and others. There are 3 permission bits for each permission group, read, write, and execute, respectively.

　　

Note: You can use the STAT function to get the status information for a directory file. The permissions are st_mode in the stat structure.

(2) Test Directory access permissions: The program gets the directory file status information, if it is a non-directory file, then the program exits. The program checks whether the owner user of the catalog file has read-write and point-to permissions and outputs the results in full.

1#include <stdio.h>2#include <stdlib.h>3#include <unistd.h>4#include <sys/stat.h>5 intMainvoid)6 {7     structStat buf;/*Store file status information*/8     if(Stat (" /Home", &buf) = =-1){/*Get file status information*/9Perror ("fail to stat");TenExit1); One     } A     if(! S_isdir (Buf.st_mode)) {/*Non-catalog files*/ -printf"This is not a directory file\n"); -Exit1); the     } -     if(S_irusr & Buf.st_mode)/*owner user has read directory permissions*/ -printf"user can read the dir\n"); -     if(S_iwusr & Buf.st_mode)/*owner user has write directory permission*/ +printf"user can write the dir\n"); -     if(S_ixusr & Buf.st_mode)/*owner user has execute directory permission*/ +printf"user can through the dir\n"); A     return 0; at}

(3)

Two Create a directory

(1) function

mkdir (const char* pathname,mode_t mode);

(2) return

Success: 0

Failed:-1

(3) Implement Create directory

1#include <stdio.h>2#include <unistd.h>3#include <stdlib.h>4#include <sys/stat.h>5 intMainvoid)6 {7     if(MkDir ("/home/tmp", S_IRUSR | S_IWUSR | S_IXUSR) = =-1){/*Chong8 Build a directory*/9Perror ("fail to mkdir");TenExit1); One     } Aprintf"successfully make a dir\n");/*Output hint Information*/ -     return 0; -}

(4)

Third, delete a directory

(1) function: int rmdir (const char*pathname)

return value:

Success: 1

Failed:-1

(2) Realize

1#include <stdio.h>2#include <stdlib.h>3#include <unistd.h>4 intMainvoid)5 {6     if(RmDir ("/home/tmp") == -1){/*Output a directory*/7Perror ("fail to Rmkdir");8Exit1);9     }Tenprintf"successfully remove a dir\n");/*Output hint Information*/ One     return 0; A}

(3)

Directory operations in Linux <1>