Stat ( ) System Call in C Program with Examples

stat():

This function return information about a file.

stat structure, which contains the following fields:

struct stat { dev_t st_dev; /* ID of device containing file */ ino_t st_ino; /* inode number */ mode_t st_mode; /* protection */ nlink_t st_nlink; /* number of hard links */ uid_t st_uid; /* user ID of owner */ gid_t st_gid; /* group ID of owner */ dev_t st_rdev; /* device ID (if special file) */ off_t st_size; /* total size, in bytes */ blksize_t st_blksize; /* blocksize for filesystem I/O */ blkcnt_t st_blocks; /* number of blocks allocated */ time_t st_atime; /* time of last access */ time_t st_mtime; /* time of last modification */ time_t st_ctime; /* time of last status change */ };
Code language: JavaScript (javascript)

The following example shows how to use stat system call in C programming language in Linux, Ubuntu.

EXAMPLE 1:{ref: https://linuxhint.com/stat-system-call-linux/}

In the following code we are going to find the mode of a file:

Program:

#include<stdio.h>
#include<sys/stat.h>
int main()
{
  struct stat sfile; //pointer to stat struct
  stat("stat.c", &sfile); //stat system call
  printf("st_mode = %o", sfile.st_mode); //accessing st_mode (data member of stat struct)
  return 0;
}

Output:

  • In this code, we have passed the name of the file in the stat system call and then the pointer to stat struct which is sfile.
  • The pointer to stat struct is then used to access st_mode which displays the mode of the file using printf statement.
  • The header file <sys/stat.h> is used so you can use a stat system call.
  • The header file <stdio.h> is the standard input/output library file so that you can use printf or scanf in your C code.

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