Sortix nightly manual
This manual documents Sortix nightly, a development build that has not been officially released. You can instead view this document in the latest official manual.
file descriptor BIO
openssl/bio.h>const BIO_METHOD *
BIO_set_fd(BIO *b, int fd, long close_flag);long
BIO_get_fd(BIO *b, int *c);BIO *
BIO_new_fd(int fd, int close_flag);int
BIO_set_fd(BIO *b, int fd, long close_flag);
BIO_get_fd(BIO *b, int *c);
BIO_new_fd(int fd, int close_flag);
read(2) and write(2).BIO_read(3) and BIO_write(3) read or write the underlying descriptor. BIO_puts(3) is supported but BIO_gets(3) is not.If the close flag is set, close(2) is called on the underlying file descriptor when the BIO is freed.BIO_reset(3) attempts to set the file pointer to the start of the file using lseek(fd, 0, 0).BIO_seek(3) sets the file pointer to position ofs from start of file using lseek(fd, ofs, 0).BIO_tell(3) returns the current file position by calling lseek(fd, 0, 1).BIO_set_fd() sets the file descriptor of BIO b to fd and the close flag to close_flag. It is currently implemented as a macro.BIO_get_fd() places the file descriptor in c if it is not NULL and also returns the file descriptor. It is currently implemented as a macro.BIO_new_fd() returns a file descriptor BIO using fd and close_flag.BIO_fd_non_fatal_error() determines whether the error status code errnum represents a recoverable error. BIO_fd_should_retry() determines whether a recoverable error occurred by inspecting both errno(2) and retval, which is supposed to usually be the return value of a previously called function like BIO_read(3) or BIO_write(3). These two functions are mostly used internally; in application code, it is usually easier and more robust to use BIO_should_retry(3), which works for any BIO type.The behaviour of BIO_read(3) and BIO_write(3) depends on the behavior of the platform's read(2) and write(2) calls on the descriptor. If the underlying file descriptor is in a non-blocking mode, then the BIO will behave in the manner described in the BIO_read(3) and BIO_should_retry(3) manual pages.File descriptor BIOs should not be used for socket I/O. Use socket BIOs instead.BIO_set_fd() and BIO_get_fd() are implemented as macros.
BIO *out; out = BIO_new_fd(fileno(stdout), BIO_NOCLOSE); BIO_printf(out, "Hello World\n"); BIO_free(out);