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BIO_s_fd(3) OpenSSL BIO_s_fd(3) NAME BIO_s_fd, BIO_set_fd, BIO_get_fd, BIO_new_fd - file descriptor BIO LIBRARY libcrypto, -lcrypto SYNOPSIS #include <openssl/bio.h> BIO_METHOD * BIO_s_fd(void); #define BIO_set_fd(b,fd,c) BIO_int_ctrl(b,BIO_C_SET_FD,c,fd) #define BIO_get_fd(b,c) BIO_ctrl(b,BIO_C_GET_FD,0,(char *)c) BIO *BIO_new_fd(int fd, int close_flag); DESCRIPTION BIO_s_fd() returns the file descriptor BIO method. This is a wrapper round the platforms file descriptor routines such as read() and write(). BIO_read() and BIO_write() read or write the underlying descriptor. BIO_puts() is supported but BIO_gets() is not. If the close flag is set then then close() is called on the underlying file descriptor when the BIO is freed. BIO_reset() attempts to change the file pointer to the start of file using lseek(fd, 0, 0). BIO_seek() sets the file pointer to position ofs from start of file using lseek(fd, ofs, 0). BIO_tell() 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 c. BIO_get_fd() places the file descriptor in c if it is not NULL, it also returns the file descriptor. If c is not NULL it should be of type (int *). BIO_new_fd() returns a file descriptor BIO using fd and close_flag. NOTES The behaviour of BIO_read() and BIO_write() depends on the behavior of the platforms read() and write() 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. RETURN VALUES BIO_s_fd() returns the file descriptor BIO method. BIO_reset() returns zero for success and -1 if an error occurred. BIO_seek() and BIO_tell() return the current file position or -1 is an error occurred. These values reflect the underlying lseek() behaviour. BIO_set_fd() always returns 1. BIO_get_fd() returns the file descriptor or -1 if the BIO has not been initialized. BIO_new_fd() returns the newly allocated BIO or NULL is an error occurred. EXAMPLE This is a file descriptor BIO version of "Hello World": BIO *out; out = BIO_new_fd(fileno(stdout), BIO_NOCLOSE); BIO_printf(out, "Hello World\n"); BIO_free(out); SEE ALSO BIO_seek(3), BIO_tell(3), BIO_reset(3), BIO_read(3), BIO_write(3), BIO_puts(3), BIO_gets(3), BIO_printf(3), BIO_set_close(3), BIO_get_close(3) 1.0.2k 2009-07-19 BIO_s_fd(3)