Tue Jul 30 09:21:10 2002
Standard preamble:
======================================================================
\\$1
.. ..
.... Set up some character translations and predefined strings. \*(-- will
give an unbreakable dash, \*(PI will give pi, \*(L" will give a left
double quote, and \*(R" will give a right double quote. | will give a
real vertical bar. \*(C+ will give a nicer C++. Capital omega is used
to do unbreakable dashes and therefore won't be available. \*(C` and
\*(C' expand to `' in nroff, nothing in troff, for use with C<>
.tr \(*W-|\(bv\*(Tr . ds -- \(*W- . ds PI pi . if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch . if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch . ds L" "" . ds R" "" . ds C` "" . ds C' "" 'br\} . ds -- \|\(em\| . ds PI \(*p . ds L" `` . ds R" '' 'br\}
If the F register is turned on, we'll generate index entries on stderr
for titles (.TH), headers (.SH), subsections (.Sh), items (.Ip), and
index entries marked with X<> in POD. Of course, you'll have to process
the output yourself in some meaningful fashion.
. de IX . tm Index:\\$1\t\\n%\t"\\$2" .. . nr % 0 . rr F .\}
For nroff, turn off justification. Always turn off hyphenation; it
makes way too many mistakes in technical documents.
Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2).
Fear. Run. Save yourself. No user-serviceable parts.
.bd B 3 . \" fudge factors for nroff and troff . ds #H 0 . ds #V .8m . ds #F .3m . ds #[ \f1 . ds #] .\} . ds #H ((1u-(\\\\n(.fu%2u))*.13m) . ds #V .6m . ds #F 0 . ds #[ \& . ds #] \& .\} . \" simple accents for nroff and troff . ds ' \& . ds ` \& . ds ^ \& . ds , \& . ds ~ ~ . ds / .\} . ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u" . ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u' . ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u' . ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u' . ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u' . ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u' .\} . \" troff and (daisy-wheel) nroff accents . \" corrections for vroff . \" for low resolution devices (crt and lpr) \{\ . ds : e . ds 8 ss . ds o a . ds d- d\h'-1'\(ga . ds D- D\h'-1'\(hy . ds th \o'bp' . ds Th \o'LP' . ds ae ae . ds Ae AE .\} ======================================================================
Title "BIO_s_fd 3"
\fIBIO_read() and BIO_write() read or write the underlying descriptor. \fIBIO_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 \s-1BIO\s0 is freed.
\fIBIO_reset() attempts to change the file pointer to the start of file using lseek(fd, 0, 0).
\fIBIO_seek() sets the file pointer to position ofs from start of file using lseek(fd, ofs, 0).
\fIBIO_tell() returns the current file position by calling lseek(fd, 0, 1).
\fIBIO_set_fd() sets the file descriptor of \s-1BIO\s0 b to fd and the close flag to c.
\fIBIO_get_fd() places the file descriptor in c if it is not \s-1NULL\s0, it also returns the file descriptor. If c is not \s-1NULL\s0 it should be of type (int *).
\fIBIO_new_fd() returns a file descriptor \s-1BIO\s0 using fd and close_flag.
File descriptor BIOs should not be used for socket I/O. Use socket BIOs instead.
\fIBIO_reset() returns zero for success and -1 if an error occurred. \fIBIO_seek() and BIO_tell() return the current file position or -1 is an error occurred. These values reflect the underlying lseek() behaviour.
\fIBIO_set_fd() always returns 1.
\fIBIO_get_fd() returns the file descriptor or -1 if the \s-1BIO\s0 has not been initialized.
\fIBIO_new_fd() returns the newly allocated \s-1BIO\s0 or \s-1NULL\s0 is an error occurred.
.Vb 4 BIO *out; out = BIO_new_fd(fileno(stdout), BIO_NOCLOSE); BIO_printf(out, "Hello World\en"); BIO_free(out); .Ve