mirror of
https://sourceware.org/git/glibc.git
synced 2025-11-03 20:53:13 +03:00
49 lines
1.6 KiB
C
49 lines
1.6 KiB
C
/* clock_getcpuclockid -- Get a clockid_t for process CPU time. Linux version.
|
|
Copyright (C) 2004-2015 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-posix-cpu-timers.h"
|
|
|
|
int
|
|
__clock_getcpuclockid (pid_t pid, clockid_t *clock_id)
|
|
{
|
|
/* 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);
|
|
|
|
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 (INTERNAL_SYSCALL_ERRNO (r, err) == EINVAL)
|
|
{
|
|
/* The clock_getres system call checked the PID for us. */
|
|
return ESRCH;
|
|
}
|
|
else
|
|
return INTERNAL_SYSCALL_ERRNO (r, err);
|
|
}
|
|
weak_alias (__clock_getcpuclockid, clock_getcpuclockid)
|