--- name: "pfm_self_stop" section: "3" platform: "linux" package: "libpfm3-3.2-dev" version: "3.2.070507-1.1" release: "Debian 6.0 (Squeeze)" platforms: ["linux"] url: "https://new.carta.tech/pfm_self_start" --- # pfm\_self\_stop(3) start and stop monitoring for a self-monitoring process Part of [pfm\_self\_start(3)](/pfm_self_start/3.md). ## NAME pfm\_self\_start, pfm\_self\_stop - start and stop monitoring for a self-monitoring process ## SYNOPSIS ``` #include int pfm_self_start(int fd); int pfm_self_stop(int fd); ``` ## DESCRIPTION These two functions can only be used by self-monitoring processes. They have no effect on system wide sessions. The **pfm\_self\_start** function activates monitoring. This function is equivalent to calling **perfmonctl()** with the **PFM\_START** command and may end up calling it. On Linux/ia64 it is implemented as a lightweight call to set the **psr.up** bit. The **pfm\_self\_stop** function deactivates monitoring This function is equivalent to calling **perfmonctl()** with the **PFM\_STOP** command and may end up calling it.On Linux/ia64 it is implemented as a lightweight call to clear the **psr.up** bit. ## RETURN The function returns 0 if successful, otherwise -1 and the error code is set in errno. ## ERRORS 0 is always returned on Linux/ia64. ## AUTHOR Stephane Eranian \