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62 lines
2.1 KiB
C
62 lines
2.1 KiB
C
/* clock_getcpuclockid -- Get a clockid_t for process CPU time. Linux version.
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Copyright (C) 2004-2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <time.h>
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#include <unistd.h>
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#include "kernel-posix-cpu-timers.h"
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#include <sysdep.h>
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#include <shlib-compat.h>
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int
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__clock_getcpuclockid (pid_t pid, clockid_t *clock_id)
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{
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/* The clockid_t value is a simple computation from the PID.
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But we do a clock_getres call to validate it. */
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const clockid_t pidclock = make_process_cpuclock (pid, CPUCLOCK_SCHED);
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#ifndef __NR_clock_getres_time64
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# define __NR_clock_getres_time64 __NR_clock_getres
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#endif
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int r = INTERNAL_SYSCALL_CALL (clock_getres_time64, pidclock, NULL);
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#ifndef __ASSUME_TIME64_SYSCALLS
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if (r != 0 && r == -ENOSYS)
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r = INTERNAL_SYSCALL_CALL (clock_getres, pidclock, NULL);
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#endif
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if (r == 0)
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{
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*clock_id = pidclock;
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return 0;
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}
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if (r == -EINVAL)
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/* The clock_getres system call checked the PID for us. */
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return ESRCH;
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return -r;
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}
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versioned_symbol (libc, __clock_getcpuclockid, clock_getcpuclockid, GLIBC_2_17);
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/* clock_getcpuclockid moved to libc in version 2.17;
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old binaries may expect the symbol version it had in librt. */
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#if SHLIB_COMPAT (libc, GLIBC_2_2, GLIBC_2_17)
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strong_alias (__clock_getcpuclockid, __clock_getcpuclockid_2);
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compat_symbol (libc, __clock_getcpuclockid_2, clock_getcpuclockid, GLIBC_2_2);
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#endif
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