[#OSSL_trace_set_prefix]
= OSSL_trace_set_prefix
:mrdocs:

Set the text printed before each trace group for `category.`

== Synopsis

Declared in `<openssl/trace.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
OSSL_trace_set_prefix(
    int category,
    char const* prefix);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *category*
| OSSL_TRACE_CATEGORY_* value selecting the channel.
| *prefix*
| Prefix string, or NULL to clear any existing prefix.
|===


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