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Edit File : BIO_set_fd.3ssl \| Size : 6.94 KB
.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.35) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" 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. \(C+ will .\" give a nicer C++. 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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" BIO_s_fd, BIO_set_fd, BIO_get_fd, BIO_new_fd \- file descriptor BIO .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #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); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBBIO_s_fd()\fR returns the file descriptor \s-1BIO\s0 method. This is a wrapper round the platforms file descriptor routines such as \fBread()\fR and \fBwrite()\fR. .PP \&\fBBIO_read()\fR and \fBBIO_write()\fR read or write the underlying descriptor. \&\fBBIO_puts()\fR is supported but \fBBIO_gets()\fR is not. .PP If the close flag is set then then \fBclose()\fR is called on the underlying file descriptor when the \s-1BIO\s0 is freed. .PP \&\fBBIO_reset()\fR attempts to change the file pointer to the start of file using lseek(fd, 0, 0). .PP \&\fBBIO_seek()\fR sets the file pointer to position \fBofs\fR from start of file using lseek(fd, ofs, 0). .PP \&\fBBIO_tell()\fR returns the current file position by calling lseek(fd, 0, 1). .PP \&\fBBIO_set_fd()\fR sets the file descriptor of \s-1BIO\s0 \fBb\fR to \fBfd\fR and the close flag to \fBc\fR. .PP \&\fBBIO_get_fd()\fR places the file descriptor in \fBc\fR if it is not \s-1NULL,\s0 it also returns the file descriptor. If \fBc\fR is not \s-1NULL\s0 it should be of type (int ). .PP \&\fBBIO_new_fd()\fR returns a file descriptor \s-1BIO\s0 using \fBfd\fR and \fBclose_flag\fR. .SH "NOTES" .IX Header "NOTES" The behaviour of \fBBIO_read()\fR and \fBBIO_write()\fR depends on the behavior of the platforms \fBread()\fR and \fBwrite()\fR calls on the descriptor. If the underlying file descriptor is in a non blocking mode then the \s-1BIO\s0 will behave in the manner described in the \fBBIO_read\fR\\|(3) and \fBBIO_should_retry\fR\\|(3) manual pages. .PP File descriptor BIOs should not be used for socket I/O. Use socket BIOs instead. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBBIO_s_fd()\fR returns the file descriptor \s-1BIO\s0 method. .PP \&\fBBIO_reset()\fR returns zero for success and \-1 if an error occurred. \&\fBBIO_seek()\fR and \fBBIO_tell()\fR return the current file position or \-1 if an error occurred. These values reflect the underlying \fBlseek()\fR behaviour. .PP \&\fBBIO_set_fd()\fR always returns 1. .PP \&\fBBIO_get_fd()\fR returns the file descriptor or \-1 if the \s-1BIO\s0 has not been initialized. .PP \&\fBBIO_new_fd()\fR returns the newly allocated \s-1BIO\s0 or \s-1NULL\s0 is an error occurred. .SH "EXAMPLE" .IX Header "EXAMPLE" This is a file descriptor \s-1BIO\s0 version of \(L"Hello World\(R": .PP .Vb 4 \& BIO out; \& out = BIO_new_fd(fileno(stdout), BIO_NOCLOSE); \& BIO_printf(out, "Hello World\en"); \& BIO_free(out); .Ve .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBBIO_seek\fR\\|(3), \fBBIO_tell\fR\\|(3), \&\fBBIO_reset\fR\\|(3), \fBBIO_read\fR\\|(3), \&\fBBIO_write\fR\\|(3), \fBBIO_puts\fR\\|(3), \&\fBBIO_gets\fR\\|(3), \fBBIO_printf\fR\\|(3), \&\fBBIO_set_close\fR\\|(3), \fBBIO_get_close\fR\\|(3) Back

Edit File : BIO_set_fd.3ssl | Size : 6.94 KB

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.\" ========================================================================
.\"
.IX Title "BIO_s_fd 3"
.TH BIO_s_fd 3 "2019-12-20" "1.0.2u" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
BIO_s_fd, BIO_set_fd, BIO_get_fd, BIO_new_fd \- file descriptor BIO
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #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);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBBIO_s_fd()\fR returns the file descriptor \s-1BIO\s0 method. This is a wrapper
round the platforms file descriptor routines such as \fBread()\fR and \fBwrite()\fR.
.PP
\&\fBBIO_read()\fR and \fBBIO_write()\fR read or write the underlying descriptor.
\&\fBBIO_puts()\fR is supported but \fBBIO_gets()\fR is not.
.PP
If the close flag is set then then \fBclose()\fR is called on the underlying
file descriptor when the \s-1BIO\s0 is freed.
.PP
\&\fBBIO_reset()\fR attempts to change the file pointer to the start of file
using lseek(fd, 0, 0).
.PP
\&\fBBIO_seek()\fR sets the file pointer to position \fBofs\fR from start of file
using lseek(fd, ofs, 0).
.PP
\&\fBBIO_tell()\fR returns the current file position by calling lseek(fd, 0, 1).
.PP
\&\fBBIO_set_fd()\fR sets the file descriptor of \s-1BIO\s0 \fBb\fR to \fBfd\fR and the close
flag to \fBc\fR.
.PP
\&\fBBIO_get_fd()\fR places the file descriptor in \fBc\fR if it is not \s-1NULL,\s0 it also
returns the file descriptor. If \fBc\fR is not \s-1NULL\s0 it should be of type
(int *).
.PP
\&\fBBIO_new_fd()\fR returns a file descriptor \s-1BIO\s0 using \fBfd\fR and \fBclose_flag\fR.
.SH "NOTES"
.IX Header "NOTES"
The behaviour of \fBBIO_read()\fR and \fBBIO_write()\fR depends on the behavior of the
platforms \fBread()\fR and \fBwrite()\fR calls on the descriptor. If the underlying 
file descriptor is in a non blocking mode then the \s-1BIO\s0 will behave in the
manner described in the \fBBIO_read\fR\|(3) and \fBBIO_should_retry\fR\|(3)
manual pages.
.PP
File descriptor BIOs should not be used for socket I/O. Use socket BIOs
instead.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBBIO_s_fd()\fR returns the file descriptor \s-1BIO\s0 method.
.PP
\&\fBBIO_reset()\fR returns zero for success and \-1 if an error occurred.
\&\fBBIO_seek()\fR and \fBBIO_tell()\fR return the current file position or \-1
if an error occurred. These values reflect the underlying \fBlseek()\fR
behaviour.
.PP
\&\fBBIO_set_fd()\fR always returns 1.
.PP
\&\fBBIO_get_fd()\fR returns the file descriptor or \-1 if the \s-1BIO\s0 has not
been initialized.
.PP
\&\fBBIO_new_fd()\fR returns the newly allocated \s-1BIO\s0 or \s-1NULL\s0 is an error
occurred.
.SH "EXAMPLE"
.IX Header "EXAMPLE"
This is a file descriptor \s-1BIO\s0 version of \*(L"Hello World\*(R":
.PP
.Vb 4
\& BIO *out;
\& out = BIO_new_fd(fileno(stdout), BIO_NOCLOSE);
\& BIO_printf(out, "Hello World\en");
\& BIO_free(out);
.Ve
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBBIO_seek\fR\|(3), \fBBIO_tell\fR\|(3),
\&\fBBIO_reset\fR\|(3), \fBBIO_read\fR\|(3),
\&\fBBIO_write\fR\|(3), \fBBIO_puts\fR\|(3),
\&\fBBIO_gets\fR\|(3), \fBBIO_printf\fR\|(3),
\&\fBBIO_set_close\fR\|(3), \fBBIO_get_close\fR\|(3)

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