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1 /* clock_getcpuclockid -- Get a clockid_t for process CPU time. Linux version.
2 Copyright (C) 2004-2023 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 <https://www.gnu.org/licenses/>. */
22 #include "kernel-posix-cpu-timers.h"
24 #include <shlib-compat.h>
27 __clock_getcpuclockid (pid_t pid
, clockid_t
*clock_id
)
29 /* The clockid_t value is a simple computation from the PID.
30 But we do a clock_getres call to validate it. */
32 const clockid_t pidclock
= make_process_cpuclock (pid
, CPUCLOCK_SCHED
);
34 #ifndef __NR_clock_getres_time64
35 # define __NR_clock_getres_time64 __NR_clock_getres
37 int r
= INTERNAL_SYSCALL_CALL (clock_getres_time64
, pidclock
, NULL
);
39 #ifndef __ASSUME_TIME64_SYSCALLS
40 if (r
!= 0 && r
== -ENOSYS
)
41 r
= INTERNAL_SYSCALL_CALL (clock_getres
, pidclock
, NULL
);
50 /* The clock_getres system call checked the PID for us. */
55 versioned_symbol (libc
, __clock_getcpuclockid
, clock_getcpuclockid
, GLIBC_2_17
);
56 /* clock_getcpuclockid moved to libc in version 2.17;
57 old binaries may expect the symbol version it had in librt. */
58 #if SHLIB_COMPAT (libc, GLIBC_2_2, GLIBC_2_17)
59 strong_alias (__clock_getcpuclockid
, __clock_getcpuclockid_2
);
60 compat_symbol (libc
, __clock_getcpuclockid_2
, clock_getcpuclockid
, GLIBC_2_2
);