---
name: "pmc_init"
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_init"
---

# pmc\_init(3)

initialize library

## NAME

**pmc\_init** – initialize library

## LIBRARY

library “libpmc”

## SYNOPSIS

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

*int*\

**pmc\_init**(*void*);

## DESCRIPTION

Function **pmc\_init**() initializes the PMC library. This function must be called before any of the other functions in the library.

## RETURN VALUES

The **pmc\_init()** 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\_init**() may fail with the following errors:

- \[ENOENT\]

  The [hwpmc(4)](/hwpmc/4.md) module was not found in the kernel.

- \[EPROGMISMATCH\]

  The library's version number did not match that expected by [hwpmc(4)](/hwpmc/4.md).

- \[ENXIO\]

  PMC hardware on this system is unsupported.

## SEE ALSO

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