read_pos
#define read_pos fssh_read_pos
read_pos(int fd, off_t pos, void *buffer, size_t bufferSize)
read_pos(int fd, off_t offset, void *buffer, size_t bufferSize)
read_pos(int fd, off_t pos, void* buffer, size_t bufferSize)
void read_pos() {}
void read_pos() {}
# define read_pos(fd, pos, buffer, size) pread(fd, buffer, size, pos)
#undef read_pos
#define read_pos block_cache_read_pos