write a c program to know read write permission of given file, Problem Solving, Adv C

Answer

#include "time.h"
#include "sys\stat.h"
#include "stdio.h"
void main(){
    struct stat status;
    FILE *fp;
    stat("test.txt",&status);
    clrscr();
    if (status.st_mode & S_IREAD)
         printf("You have read permission.\n");
    if (status.st_mode & S_IWRITE)
         printf("You have write permission.");
    getch();

}

+ ExplanationNot Moderated

Function int stat(char *, struct stat *) store the information of open file in form of structure struct stat Structure struct stat has been defined in sysstat.h as

struct stat {
    short  st_dev,   st_ino;
    short  st_mode,  st_nlink;
    int    st_uid,   st_gid;
    short  st_rdev;
    long   st_size,  st_atime;
    long   st_mtime, st_ctime;
};

Here (i)st_dev: It describe file has stored in which drive of your computer. (j)st_mode: It describe various mode of file like file is read only, write only, folder, character file etc. (k)st_size: It tells the size of file in byte. (l)St_ctime:It tells last data of modification of the file. There are some macro has been defined in sysstat.h Name Meaning S_IFMT File type mask S_IFDIR Directory S_IFIFO FIFO special S_IFCHR Character special S_IFBLK Block special S_IFREG Regular file S_IREAD Owner can read S_IWRITE Owner can write S_IEXEC Owner can execute So masking or bit wise and operation between status.st_mode and S_IREAD return true you have read permission and so on

Question:Write a c program to know read/write permission of given file.

Answer
#include "time.h" #include "sys\stat.h" #include "stdio.h" void main(){ struct stat status; FILE *fp; stat("test.txt",&status); clrscr(); if (status.st_mode & S_IREAD) printf("You have read permission.\n"); if (status.st_mode & S_IWRITE) printf("You have write permission."); getch(); }

Question:Write a c program to know read/write permission of given file.

Answer #include "time.h" #include "sys\stat.h" #include "stdio.h" void main(){ struct stat status; FILE *fp; stat("test.txt",&status); clrscr(); if (status.st_mode & S_IREAD) printf("You have read permission.\n"); if (status.st_mode & S_IWRITE) printf("You have write permission."); getch(); }

Answer
#include "time.h" #include "sys\stat.h" #include "stdio.h" void main(){ struct stat status; FILE *fp; stat("test.txt",&status); clrscr(); if (status.st_mode & S_IREAD) printf("You have read permission.\n"); if (status.st_mode & S_IWRITE) printf("You have write permission."); getch(); }