mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-25 04:01:10 +00:00
103 lines
3.0 KiB
C
103 lines
3.0 KiB
C
/* clock_getcpuclockid -- Get a clockid_t for process CPU time. Linux version.
|
|
Copyright (C) 2004, 2005, 2006 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <errno.h>
|
|
#include <time.h>
|
|
#include <unistd.h>
|
|
#include <kernel-features.h>
|
|
#include "kernel-posix-cpu-timers.h"
|
|
|
|
#ifndef HAS_CPUCLOCK
|
|
# define HAS_CPUCLOCK 1
|
|
#endif
|
|
|
|
int
|
|
clock_getcpuclockid (pid_t pid, clockid_t *clock_id)
|
|
{
|
|
#ifdef __NR_clock_getres
|
|
/* The clockid_t value is a simple computation from the PID.
|
|
But we do a clock_getres call to validate it. */
|
|
|
|
const clockid_t pidclock = MAKE_PROCESS_CPUCLOCK (pid, CPUCLOCK_SCHED);
|
|
|
|
# if !(__ASSUME_POSIX_CPU_TIMERS > 0)
|
|
extern int __libc_missing_posix_cpu_timers attribute_hidden;
|
|
# if !(__ASSUME_POSIX_TIMERS > 0)
|
|
extern int __libc_missing_posix_timers attribute_hidden;
|
|
if (__libc_missing_posix_timers && !__libc_missing_posix_cpu_timers)
|
|
__libc_missing_posix_cpu_timers = 1;
|
|
# endif
|
|
if (!__libc_missing_posix_cpu_timers)
|
|
# endif
|
|
{
|
|
INTERNAL_SYSCALL_DECL (err);
|
|
int r = INTERNAL_SYSCALL (clock_getres, err, 2, pidclock, NULL);
|
|
if (!INTERNAL_SYSCALL_ERROR_P (r, err))
|
|
{
|
|
*clock_id = pidclock;
|
|
return 0;
|
|
}
|
|
|
|
# if !(__ASSUME_POSIX_TIMERS > 0)
|
|
if (INTERNAL_SYSCALL_ERRNO (r, err) == ENOSYS)
|
|
{
|
|
/* The kernel doesn't support these calls at all. */
|
|
__libc_missing_posix_timers = 1;
|
|
__libc_missing_posix_cpu_timers = 1;
|
|
}
|
|
else
|
|
# endif
|
|
if (INTERNAL_SYSCALL_ERRNO (r, err) == EINVAL)
|
|
{
|
|
# if !(__ASSUME_POSIX_CPU_TIMERS > 0)
|
|
if (pidclock == MAKE_PROCESS_CPUCLOCK (0, CPUCLOCK_SCHED)
|
|
|| INTERNAL_SYSCALL_ERROR_P (INTERNAL_SYSCALL
|
|
(clock_getres, err, 2,
|
|
MAKE_PROCESS_CPUCLOCK
|
|
(0, CPUCLOCK_SCHED), NULL),
|
|
err))
|
|
/* The kernel doesn't support these clocks at all. */
|
|
__libc_missing_posix_cpu_timers = 1;
|
|
else
|
|
# endif
|
|
/* The clock_getres system call checked the PID for us. */
|
|
return ESRCH;
|
|
}
|
|
else
|
|
return INTERNAL_SYSCALL_ERRNO (r, err);
|
|
}
|
|
#endif
|
|
|
|
/* We don't allow any process ID but our own. */
|
|
if (pid != 0 && pid != getpid ())
|
|
return EPERM;
|
|
|
|
#ifdef CLOCK_PROCESS_CPUTIME_ID
|
|
if (HAS_CPUCLOCK)
|
|
{
|
|
/* Store the number. */
|
|
*clock_id = CLOCK_PROCESS_CPUTIME_ID;
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/* We don't have a timer for that. */
|
|
return ENOENT;
|
|
}
|