fd.h

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#pragma once

#ifdef __cplusplus
extern "C" {
#endif

#include<libtransistor/types.h>

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

typedef struct trn_file_t trn_file_t;

typedef struct {
    result_t (*seek) (void *data, off_t offset, int whence, off_t *out);
    result_t (*read) (void *data, void *buf, size_t size, size_t *bytes_read);
    result_t (*write) (void *data, const void *buf, size_t size, size_t *bytes_written);
    //result_t (*flush) (void *data);
    
    // Release data, and file_operations if it was allocated.
    result_t (*release) (trn_file_t *file);
} trn_file_ops_t;

struct trn_file_t {
    _Atomic(int) refcount;
    trn_file_ops_t *ops;
    void *data;
};

int fd_create_file(trn_file_ops_t *fops, void *data);

trn_file_t *fd_file_get(int fd);

void fd_file_put(trn_file_t *file);

int fd_close(int fd);

// Duplicates oldfd, and all its associated locks, into newfd. Newfd is closed
// if necessary
int fd_dup2(int oldfd, int newfd);

#ifdef __cplusplus
}
#endif