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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_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

File descriptor BIOs should not be used for socket I/O. Use socket BIOs instead.  

RETURN VALUES

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

 BIO *out;
 out = BIO_new_fd(fileno(stdout), BIO_NOCLOSE);
 BIO_printf(out, "Hello World\n");
 BIO_free(out);

SEE ALSO

Index

NAME

SYNOPSIS

DESCRIPTION

NOTES

RETURN VALUES

EXAMPLE

SEE ALSO

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