Thread: stat()

The man page for stat() lists the prototype and how to use it.

Code:

// I use Solaris 8 - may be different
#include <sys/types.h>
#include <sys/stat.h>

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

// directories leading to file in path must be searchable.

mode_t   st_mode; /* File mode (see mknod(2)) */
ino_t    st_ino;        /* Inode number */
dev_t    st_dev;      /* ID of device containing */
                               /* a directory entry for this file */
dev_t    st_rdev;     /* ID of device */
                               /* This entry is defined only for */
                               /* char special or block special files */
nlink_t  st_nlink;     /* Number of links */
uid_t    st_uid;        /* User ID of the file's owner */
gid_t    st_gid;        /* Group ID of the file's group */
off_t    st_size;       /* File size in bytes */
time_t   st_atime;   /* Time of last access */
time_t   st_mtime;  /* Time of last data modification */
time_t   st_ctime;   /* Time of last file status change */
                              /* Times measured in seconds since */
                               /* 00:00:00 UTC, Jan. 1, 1970 */
long     st_blksize;  /* Preferred I/O block size */
blkcnt_t st_blocks; /* Number of 512 byte blocks allocated*/

Here is an example of how the stat function can be used:

Code:

#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>

#include <sys/types.h>
#include <sys/stat.h>

int main ( int argc, char *argv[])
{
    struct stat FileAttrib;

    if (argc != 2)
        printf("Usage: <executable> <file>\n");
    else
    {
        if (stat(argv[(argc - 1)], &FileAttrib) < 0)
            printf("File Error Message = %s\n", strerror(errno));
        else
        {
            tm *pTm = gmtime(&FileAttrib.st_atime);
            printf("File last accessed on: %.2i/%.2i/%.2i at %.2i:%.2i:%.2i GMT\n",
                     (pTm->tm_mon + 1),
                     pTm->tm_mday,
	     (pTm->tm_year % 100),
	     pTm->tm_hour,
	     pTm->tm_min,
	     pTm->tm_sec);
        }
    }
    return 0;
}

David

There are some syntax errors but it is close.

Code:

#include <stdio.h> 
#include <string.h> 
#include <errno.h> 
#include <string.h>  // ** don't need this twice
#include <sys/stat.h> 

#define BUFFER 100 // ** increased - file path can get pretty long

struct stat fileattrib; 

char file[BUFFER] = {'\0'}; char *nl; 

int main() // ** don't need arguments if not used
{ 
    // Get file name 
    printf("Enter Filename....\n"); 

    // ** refered to buff instead of file
    while (gets(file) != NULL) // Loop getting filename while not null 
    { 
	// ** 'nl = ' not '*nl = ' - don't dereference
	// ** refered to buf instead of file
	nl = strchr( file, '\n' ); //Search out the null entry 

	if ((file[0] == '\0')) // if a null is a 0 then exit 
	    break; 

	if ( nl != NULL ) 
	    *nl = '\0'; // remove the end of line 

	// ** stat returns 0 if file exists
	if( stat( file, &fileattrib ) == 0 )
	{ 
	    printf("Access Permissions of file: %s\n ",
			file); 
	    printf("----------------------------\n"); 
	    printf( "%d\n", fileattrib.st_mode ); 
	} 
	else 
	    printf("File Error Message = %s\n",
			strerror(errno)); 

	printf("Enter Filename....\n"); // for next filename input 
    } 
    return 0; // ** don't forget the return statement
}

David