C int open(const char *path, int oflag,...)
Open file relative to directory file descriptor.
C int errno
The lvalue errno is used by many functions to return error values.
#define ENOTSUP
Not supported (may be the same value as [EOPNOTSUPP]).
C void * malloc(size_t size)
A memory allocator.
FILE * fopen(const char *filename, const char *mode)
Open a stream.
#define NULL
NULL means zero.
A structure containing information about a file.