NAME

PR_SET_TSC - change whether the timestamp counter can be read by the process

LIBRARY

Standard C library (libc, -lc)

SYNOPSIS

#include <linux/prctl.h>  /* Definition of PR_* constants */
#include <sys/prctl.h>

int prctl(PR_SET_TSC, long flag);

DESCRIPTION

Set the state of the flag determining whether the timestamp counter can be read by the process. Pass PR_TSC_ENABLE to flag to allow it to be read, or PR_TSC_SIGSEGV to generate a SIGSEGV when the process tries to read the timestamp counter.

RETURN VALUE

On success, 0 is returned. On error, -1 is returned, and errno is set to indicate the error.

ERRORS

EINVAL

arg2 is not a valid value.

STANDARDS

Linux. x86 only.

HISTORY

Linux 2.6.26 (x86).

SEE ALSO

prctl(2), PR_GET_TSC(2const)