222 lines
6.9 KiB
Groff
Executable File
222 lines
6.9 KiB
Groff
Executable File
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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 "2020-03-02" "3.0.0-dev" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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BIO_s_fd, BIO_set_fd, BIO_get_fd, BIO_new_fd \- file descriptor BIO
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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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\&
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\& const BIO_METHOD *BIO_s_fd(void);
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\&
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\& int BIO_set_fd(BIO *b, int fd, int c);
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\& int BIO_get_fd(BIO *b, int *c);
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\&
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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_ex()\fR and \fIBIO_write_ex()\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 \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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such as by using \fBlseek(fd, 0, 0)\fR.
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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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such as by using \fBlseek(fd, ofs, 0)\fR.
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.PP
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\&\fIBIO_tell()\fR returns the current file position such as by calling
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\&\fBlseek(fd, 0, 1)\fR.
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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.
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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_ex()\fR and \fIBIO_write_ex()\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 \fIBIO_read_ex\fR\|(3) and \fIBIO_should_retry\fR\|(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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.PP
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\&\fIBIO_set_fd()\fR and \fIBIO_get_fd()\fR are implemented as macros.
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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_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 "EXAMPLES"
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.IX Header "EXAMPLES"
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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 1
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\& BIO *out;
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\&
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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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\&\fIBIO_seek\fR\|(3), \fIBIO_tell\fR\|(3),
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\&\fIBIO_reset\fR\|(3), \fIBIO_read_ex\fR\|(3),
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\&\fIBIO_write_ex\fR\|(3), \fIBIO_puts\fR\|(3),
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\&\fIBIO_gets\fR\|(3), \fIBIO_printf\fR\|(3),
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\&\fIBIO_set_close\fR\|(3), \fIBIO_get_close\fR\|(3)
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2000\-2016 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file \s-1LICENSE\s0 in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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