path: root/kernel/posix-cpu-timers.c

/*
 * Implement CPU time clocks for the POSIX clock interface.
 */

#include <linux/sched.h>
#include <linux/posix-timers.h>
#include <linux/errno.h>
#include <linux/math64.h>
#include <asm/uaccess.h>
#include <linux/kernel_stat.h>

/*
 * Called after updating RLIMIT_CPU to set timer expiration if necessary.
 */
void update_rlimit_cpu(unsigned long rlim_new)
{
	cputime_t cputime;

	cputime = secs_to_cputime(rlim_new);
	if (cputime_eq(current->signal->it_prof_expires, cputime_zero) ||
	    cputime_gt(current->signal->it_prof_expires, cputime)) {
		spin_lock_irq(&current->sighand->siglock);
		set_process_cpu_timer(current, CPUCLOCK_PROF, &cputime, NULL);
		spin_unlock_irq(&current->sighand->siglock);
	}
}

static int check_clock(const clockid_t which_clock)
{
	int error = 0;
	struct task_struct *p;
	const pid_t pid = CPUCLOCK_PID(which_clock);

	if (CPUCLOCK_WHICH(which_clock) >= CPUCLOCK_MAX)
		return -EINVAL;