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