[#OSSL_trace_set_channel]
= OSSL_trace_set_channel
:mrdocs:

Attach a BIO as the simple trace channel for `category` (ownership transfers on success).

== Synopsis

Declared in `<openssl/trace.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
OSSL_trace_set_channel(
    int category,
    xref:BIO.adoc[BIO]* channel);
----

== Description

Mutually exclusive with OSSL_trace_set_callback() for the same category.

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *category*
| OSSL_TRACE_CATEGORY_* value selecting the channel.
| *channel*
| Sink BIO for trace output, or NULL to disable tracing for `category.`
|===


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