192 lines
5.9 KiB
Groff
192 lines
5.9 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "BIO_new 3"
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.TH BIO_new 3 "2013-02-11" "1.0.1e" "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_new, BIO_set, BIO_free, BIO_vfree, BIO_free_all \- BIO allocation and freeing functions
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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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\& BIO * BIO_new(BIO_METHOD *type);
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\& int BIO_set(BIO *a,BIO_METHOD *type);
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\& int BIO_free(BIO *a);
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\& void BIO_vfree(BIO *a);
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\& void BIO_free_all(BIO *a);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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The \fIBIO_new()\fR function returns a new \s-1BIO\s0 using method \fBtype\fR.
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.PP
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\&\fIBIO_set()\fR sets the method of an already existing \s-1BIO\s0.
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.PP
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\&\fIBIO_free()\fR frees up a single \s-1BIO\s0, \fIBIO_vfree()\fR also frees up a single \s-1BIO\s0
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but it does not return a value. Calling \fIBIO_free()\fR may also have some effect
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on the underlying I/O structure, for example it may close the file being
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referred to under certain circumstances. For more details see the individual
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\&\s-1BIO_METHOD\s0 descriptions.
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.PP
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\&\fIBIO_free_all()\fR frees up an entire \s-1BIO\s0 chain, it does not halt if an error
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occurs freeing up an individual \s-1BIO\s0 in the chain.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIBIO_new()\fR returns a newly created \s-1BIO\s0 or \s-1NULL\s0 if the call fails.
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.PP
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\&\fIBIO_set()\fR, \fIBIO_free()\fR return 1 for success and 0 for failure.
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.PP
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\&\fIBIO_free_all()\fR and \fIBIO_vfree()\fR do not return values.
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.SH "NOTES"
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.IX Header "NOTES"
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Some BIOs (such as memory BIOs) can be used immediately after calling
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\&\fIBIO_new()\fR. Others (such as file BIOs) need some additional initialization,
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and frequently a utility function exists to create and initialize such BIOs.
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.PP
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If \fIBIO_free()\fR is called on a \s-1BIO\s0 chain it will only free one \s-1BIO\s0 resulting
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in a memory leak.
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.PP
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Calling \fIBIO_free_all()\fR a single \s-1BIO\s0 has the same effect as calling \fIBIO_free()\fR
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on it other than the discarded return value.
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.PP
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Normally the \fBtype\fR argument is supplied by a function which returns a
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pointer to a \s-1BIO_METHOD\s0. There is a naming convention for such functions:
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a source/sink \s-1BIO\s0 is normally called BIO_s_*() and a filter \s-1BIO\s0
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BIO_f_*();
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.SH "EXAMPLE"
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.IX Header "EXAMPLE"
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Create a memory \s-1BIO:\s0
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.PP
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.Vb 1
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\& BIO *mem = BIO_new(BIO_s_mem());
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.Ve
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\s-1TBA\s0
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