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int _access( const char *path, int mode );

Return Value

Each of these functions returns 0 if the file has the given mode. The function returns –1 if the named file does not exist or is not accessible in the given mode; in this case, errno is set as follows:

EACCES

Access denied: file’s permission setting does not allow specified access.

ENOENT

Filename or path not found.

Parameters

path

File or directory path

mode

Permission setting

Remarks

When used with files, the _access function determines whether the specified file exists and can be accessed as specified by the value of mode. When used with directories, _access determines only whether the specified directory exists; in Windows NT, all directories have read and write access.

mode Value            Checks File For
00                              Existence only
02                              Write permission
04                              Read permission
06                              Read and write permission

Example

/* ACCESS.C: This example uses _access to check the

 * file named "ACCESS.C" to see if it exists and if

 * writing is allowed.

 */

#include  io.h>

#include  stdio.h>

#include  stdlib.h>

void main( void ) {

   /* Check for existence */

   if( (_access( "ACCESS.C", 0 )) != -1 ) {

      printf( "File ACCESS.C exists " );

      /* Check for write permission */

      if( (_access( "ACCESS.C", 2 )) != -1 )

         printf( "File ACCESS.C has write permission " );

   }

} 

Output

File ACCESS.C existsFile ACCESS.C has write permission