234 lines
6.8 KiB
Groff
234 lines
6.8 KiB
Groff
.\" $NetBSD: BIO_s_fd.3,v 1.6 2002/08/09 16:15:37 itojun Exp $
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.\" ======================================================================
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.\"
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.IX Title "BIO_s_fd 3"
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.TH BIO_s_fd 3 "0.9.6g" "2001-04-12" "OpenSSL"
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.UC
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.SH "NAME"
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BIO_s_fd, BIO_set_fd, BIO_get_fd, BIO_new_fd \- file descriptor \s-1BIO\s0
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.SH "LIBRARY"
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libcrypto, -lcrypto
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/bio.h>
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.Ve
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.Vb 1
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\& BIO_METHOD * BIO_s_fd(void);
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.Ve
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.Vb 2
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\& #define BIO_set_fd(b,fd,c) BIO_int_ctrl(b,BIO_C_SET_FD,c,fd)
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\& #define BIO_get_fd(b,c) BIO_ctrl(b,BIO_C_GET_FD,0,(char *)c)
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.Ve
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.Vb 1
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\& BIO *BIO_new_fd(int fd, int close_flag);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fIBIO_s_fd()\fR returns the file descriptor \s-1BIO\s0 method. This is a wrapper
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round the platforms file descriptor routines such as \fIread()\fR and \fIwrite()\fR.
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.PP
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\&\fIBIO_read()\fR and \fIBIO_write()\fR read or write the underlying descriptor.
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\&\fIBIO_puts()\fR is supported but \fIBIO_gets()\fR is not.
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.PP
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If the close flag is set then then \fIclose()\fR is called on the underlying
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file descriptor when the \s-1BIO\s0 is freed.
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.PP
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\&\fIBIO_reset()\fR attempts to change the file pointer to the start of file
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using lseek(fd, 0, 0).
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.PP
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\&\fIBIO_seek()\fR sets the file pointer to position \fBofs\fR from start of file
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using lseek(fd, ofs, 0).
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.PP
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\&\fIBIO_tell()\fR returns the current file position by calling lseek(fd, 0, 1).
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.PP
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\&\fIBIO_set_fd()\fR sets the file descriptor of \s-1BIO\s0 \fBb\fR to \fBfd\fR and the close
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flag to \fBc\fR.
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.PP
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\&\fIBIO_get_fd()\fR places the file descriptor in \fBc\fR if it is not \s-1NULL\s0, it also
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returns the file descriptor. If \fBc\fR is not \s-1NULL\s0 it should be of type
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(int *).
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.PP
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\&\fIBIO_new_fd()\fR returns a file descriptor \s-1BIO\s0 using \fBfd\fR and \fBclose_flag\fR.
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.SH "NOTES"
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.IX Header "NOTES"
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The behaviour of \fIBIO_read()\fR and \fIBIO_write()\fR depends on the behavior of the
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platforms \fIread()\fR and \fIwrite()\fR calls on the descriptor. If the underlying
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file descriptor is in a non blocking mode then the \s-1BIO\s0 will behave in the
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manner described in the BIO_read(3) and BIO_should_retry(3)
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manual pages.
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.PP
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File descriptor BIOs should not be used for socket I/O. Use socket BIOs
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instead.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIBIO_s_fd()\fR returns the file descriptor \s-1BIO\s0 method.
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.PP
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\&\fIBIO_reset()\fR returns zero for success and \-1 if an error occurred.
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\&\fIBIO_seek()\fR and \fIBIO_tell()\fR return the current file position or \-1
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is an error occurred. These values reflect the underlying \fIlseek()\fR
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behaviour.
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.PP
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\&\fIBIO_set_fd()\fR always returns 1.
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.PP
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\&\fIBIO_get_fd()\fR returns the file descriptor or \-1 if the \s-1BIO\s0 has not
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been initialized.
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.PP
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\&\fIBIO_new_fd()\fR returns the newly allocated \s-1BIO\s0 or \s-1NULL\s0 is an error
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occurred.
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.SH "EXAMPLE"
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.IX Header "EXAMPLE"
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This is a file descriptor \s-1BIO\s0 version of \*(L"Hello World\*(R":
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.PP
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.Vb 4
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\& BIO *out;
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\& out = BIO_new_fd(fileno(stdout), BIO_NOCLOSE);
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\& BIO_printf(out, "Hello World\en");
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\& BIO_free(out);
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.Ve
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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BIO_seek(3), BIO_tell(3),
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BIO_reset(3), BIO_read(3),
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BIO_write(3), BIO_puts(3),
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BIO_gets(3), BIO_printf(3),
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BIO_set_close(3), BIO_get_close(3)
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