---
name: "pmc_event_names_of_class"
section: "3"
platform: "freebsd"
package: "base"
version: "16.0-CURRENT-20261027-61c70dc16a79"
release: "FreeBSD 16.0-CURRENT (2026-10-27)"
platforms: ["freebsd"]
url: "https://new.carta.tech/pmc_event_names_of_class"
---

# pmc\_event\_names\_of\_class(3)

return a list of event names supported by a PMC class

## NAME

**pmc\_event\_names\_of\_class** – return a list of event names supported by a PMC class

## LIBRARY

library “libpmc”

## SYNOPSIS

**#include \<pmc.h\>**

*int*\

**pmc\_event\_names\_of\_class**(*enum pmc\_class cl*, *const char \*\*\*eventnames*, *int \*nevents*);

## DESCRIPTION

Function **pmc\_event\_names\_of\_class**() retrieves the hardware event names supported by the class of PMC hardware specified by argument *cl*.

It returns an array of *const char \** pointers to names of events supported by the specified class of PMC hardware. The location pointed to by argument *nevents* is set to the number of event names returned.

The returned array is allocated using [malloc(3)](/malloc/3.md).

## RETURN VALUES

The **pmc\_event\_names\_of\_class()** function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate the error.

## ERRORS

A call to **pmc\_event\_names\_of\_class**() may fail with the following errors:

- \[EINVAL\]

  Argument *cl* was invalid.

- \[ENOMEM\]

  Allocation of a memory area to hold the result failed.

## SEE ALSO

[pmc(3)](/pmc/3.md), [hwpmc(4)](/hwpmc/4.md)