For a namespace clean function, implement _unlink, otherwise implement unlink. The detailed implementation will depend on the file handling functionality available.

A minimal implementation has no file system, so this function should always fail, setting an appropriate value in errno.

#include <errno.h>

#undef errno
extern int  errno;

int
_unlink (char *name)
{
  errno = ENOENT;
  return -1;                    /* Always fails */

}       /* _unlink () */