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_mkdir, _wmkdir

Creates a new directory.


int _mkdir(
   const char *dirname
int _wmkdir(
   const wchar_t *dirname


Path for a new directory.

Return value

Each of these functions returns the value 0 if the new directory was created. On an error, the function returns -1 and sets errno as follows.

EEXIST Directory wasn't created because dirname is the name of an existing file, directory, or device.

ENOENT Path wasn't found.

For more information about these and other return codes, see errno, _doserrno, _sys_errlist, and _sys_nerr.


The _mkdir function creates a new directory with the specified dirname. _mkdir can create only one new directory per call, so only the last component of dirname can name a new directory. _mkdir doesn't translate path delimiters. In Windows NT, both the backslash (\) and the forward slash (/) are valid path delimiters in character strings in run-time routines.

_wmkdir is a wide-character version of _mkdir; the dirname argument to _wmkdir is a wide-character string. _wmkdir and _mkdir behave identically otherwise.

By default, this function's global state is scoped to the application. To change this behavior, see Global state in the CRT.

Generic-text routine mappings

Tchar.h routine _UNICODE and _MBCS not defined _MBCS defined _UNICODE defined
_tmkdir _mkdir _mkdir _wmkdir


Routine Required header
_mkdir <direct.h>
_wmkdir <direct.h> or <wchar.h>

For more compatibility information, see Compatibility.


All versions of the C run-time libraries.


// crt_makedir.c

#include <direct.h>
#include <stdlib.h>
#include <stdio.h>

int main( void )
   if( _mkdir( "\\testtmp" ) == 0 )
      printf( "Directory '\\testtmp' was successfully created\n" );
      system( "dir \\testtmp" );
      if( _rmdir( "\\testtmp" ) == 0 )
        printf( "Directory '\\testtmp' was successfully removed\n"  );
         printf( "Problem removing directory '\\testtmp'\n" );
      printf( "Problem creating directory '\\testtmp'\n" );

Sample output

Directory '\testtmp' was successfully created
Volume in drive C has no label.
Volume Serial Number is E078-087A

Directory of C:\testtmp

02/12/2002  09:56a      <DIR>          .
02/12/2002  09:56a      <DIR>          ..
               0 File(s)              0 bytes
               2 Dir(s)  15,498,690,560 bytes free
Directory '\testtmp' was successfully removed

See also

Directory control
_chdir, _wchdir
_rmdir, _wrmdir