1 /* clock_getcpuclockid -- Get a clockid_t for process CPU time. Linux version.
2 Copyright (C) 2004-2018 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
22 #include "kernel-posix-cpu-timers.h"
25 __clock_getcpuclockid (pid_t pid
, clockid_t
*clock_id
)
27 /* The clockid_t value is a simple computation from the PID.
28 But we do a clock_getres call to validate it. */
30 const clockid_t pidclock
= MAKE_PROCESS_CPUCLOCK (pid
, CPUCLOCK_SCHED
);
32 INTERNAL_SYSCALL_DECL (err
);
33 int r
= INTERNAL_SYSCALL (clock_getres
, err
, 2, pidclock
, NULL
);
34 if (!INTERNAL_SYSCALL_ERROR_P (r
, err
))
40 if (INTERNAL_SYSCALL_ERRNO (r
, err
) == EINVAL
)
42 /* The clock_getres system call checked the PID for us. */
46 return INTERNAL_SYSCALL_ERRNO (r
, err
);
48 weak_alias (__clock_getcpuclockid
, clock_getcpuclockid
)