mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-12 06:10:10 +00:00
7c7671767e
The syscall __NR_clock_getres_time64 (for 32-bit) or __NR_clock_getres (for 64-bit) is used as default. The 32-bit fallback is used iff __ASSUME_TIME64_SYSCALLS is not defined, which assumes the kernel ABI provides either __NR_rt_sigtimedwait (32-bit time_t). Since the symbol does not use any type which might be affected by the time_t, there is no need to add a 64-bit variant. Checked on x86_64-linux-gnu and i686-linux-gnu (on 5.4 and on 4.15 kernel). Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
61 lines
2.1 KiB
C
61 lines
2.1 KiB
C
/* clock_getcpuclockid -- Get a clockid_t for process CPU time. Linux version.
|
|
Copyright (C) 2004-2020 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
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <errno.h>
|
|
#include <time.h>
|
|
#include <unistd.h>
|
|
#include "kernel-posix-cpu-timers.h"
|
|
#include <shlib-compat.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);
|
|
|
|
#ifndef __NR_clock_getres_time64
|
|
# define __NR_clock_getres_time64 __NR_clock_getres
|
|
#endif
|
|
int r = INTERNAL_SYSCALL_CALL (clock_getres_time64, pidclock, NULL);
|
|
|
|
#ifndef __ASSUME_TIME64_SYSCALLS
|
|
if (r != 0 && r == -ENOSYS)
|
|
r = INTERNAL_SYSCALL_CALL (clock_getres, pidclock, NULL);
|
|
#endif
|
|
|
|
if (r == 0)
|
|
{
|
|
*clock_id = pidclock;
|
|
return 0;
|
|
}
|
|
if (r == -EINVAL)
|
|
/* The clock_getres system call checked the PID for us. */
|
|
return ESRCH;
|
|
return -r;
|
|
}
|
|
|
|
versioned_symbol (libc, __clock_getcpuclockid, clock_getcpuclockid, GLIBC_2_17);
|
|
/* clock_getcpuclockid moved to libc in version 2.17;
|
|
old binaries may expect the symbol version it had in librt. */
|
|
#if SHLIB_COMPAT (libc, GLIBC_2_2, GLIBC_2_17)
|
|
strong_alias (__clock_getcpuclockid, __clock_getcpuclockid_2);
|
|
compat_symbol (libc, __clock_getcpuclockid_2, clock_getcpuclockid, GLIBC_2_2);
|
|
#endif
|