The OpenNET Project / Index page

[ новости /+++ | форум | теги | ]

Интерактивная система просмотра системных руководств (man-ов)

 ТемаНаборКатегория 
 
 [Cписок руководств | Печать]

BIO_s_fd (3)
  • >> BIO_s_fd (3) ( Разные man: Библиотечные вызовы )
  •  

    NAME

    BIO_s_fd, BIO_set_fd, BIO_get_fd, BIO_new_fd - file descriptor BIO
     
    

    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)


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    NOTES
    RETURN VALUES
    EXAMPLE
    SEE ALSO


    Поиск по тексту MAN-ов: 




    Партнёры:
    PostgresPro
    Inferno Solutions
    Hosting by Hoster.ru
    Хостинг:

    Закладки на сайте
    Проследить за страницей
    Created 1996-2024 by Maxim Chirkov
    Добавить, Поддержать, Вебмастеру