| 1 | /* clock_getcpuclockid -- Get a clockid_t for process CPU time. Linux version. |
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| 2 | Copyright (C) 2004-2024 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <errno.h> |
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| 20 | #include <time.h> |
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| 21 | #include <unistd.h> |
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| 22 | #include "kernel-posix-cpu-timers.h" |
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| 23 | #include <sysdep.h> |
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| 24 | #include <shlib-compat.h> |
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| 25 | |
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| 26 | int |
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| 27 | __clock_getcpuclockid (pid_t pid, clockid_t *clock_id) |
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| 28 | { |
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| 29 | /* The clockid_t value is a simple computation from the PID. |
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| 30 | But we do a clock_getres call to validate it. */ |
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| 31 | |
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| 32 | const clockid_t pidclock = make_process_cpuclock (pid, CPUCLOCK_SCHED); |
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| 33 | |
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| 34 | #ifndef __NR_clock_getres_time64 |
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| 35 | # define __NR_clock_getres_time64 __NR_clock_getres |
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| 36 | #endif |
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| 37 | int r = INTERNAL_SYSCALL_CALL (clock_getres_time64, pidclock, NULL); |
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| 38 | |
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| 39 | #ifndef __ASSUME_TIME64_SYSCALLS |
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| 40 | if (r != 0 && r == -ENOSYS) |
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| 41 | r = INTERNAL_SYSCALL_CALL (clock_getres, pidclock, NULL); |
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| 42 | #endif |
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| 43 | |
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| 44 | if (r == 0) |
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| 45 | { |
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| 46 | *clock_id = pidclock; |
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| 47 | return 0; |
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| 48 | } |
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| 49 | if (r == -EINVAL) |
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| 50 | /* The clock_getres system call checked the PID for us. */ |
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| 51 | return ESRCH; |
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| 52 | return -r; |
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| 53 | } |
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| 54 | |
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| 55 | versioned_symbol (libc, __clock_getcpuclockid, clock_getcpuclockid, GLIBC_2_17); |
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| 56 | /* clock_getcpuclockid moved to libc in version 2.17; |
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| 57 | old binaries may expect the symbol version it had in librt. */ |
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| 58 | #if SHLIB_COMPAT (libc, GLIBC_2_2, GLIBC_2_17) |
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| 59 | strong_alias (__clock_getcpuclockid, __clock_getcpuclockid_2); |
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| 60 | compat_symbol (libc, __clock_getcpuclockid_2, clock_getcpuclockid, GLIBC_2_2); |
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| 61 | #endif |
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| 62 | |
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