| 1 | /* Get a clockid_t for the process CPU clock of a given process. Generic. |
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| 2 | Copyright (C) 2000-2024 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 <shlib-compat.h> |
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| 23 | |
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| 24 | int |
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| 25 | __clock_getcpuclockid (pid_t pid, clockid_t *clock_id) |
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| 26 | { |
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| 27 | /* We don't allow any process ID but our own. */ |
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| 28 | if (pid != 0 && pid != getpid ()) |
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| 29 | return EPERM; |
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| 30 | |
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| 31 | #ifdef CLOCK_PROCESS_CPUTIME_ID |
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| 32 | /* Store the number. */ |
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| 33 | *clock_id = CLOCK_PROCESS_CPUTIME_ID; |
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| 34 | |
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| 35 | return 0; |
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| 36 | #else |
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| 37 | /* We don't have a timer for that. */ |
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| 38 | return ENOENT; |
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| 39 | #endif |
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| 40 | } |
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| 41 | versioned_symbol (libc, __clock_getcpuclockid, clock_getcpuclockid, GLIBC_2_17); |
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| 42 | /* clock_getcpuclockid moved to libc in version 2.17; |
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| 43 | old binaries may expect the symbol version it had in librt. */ |
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| 44 | #if SHLIB_COMPAT (libc, GLIBC_2_2, GLIBC_2_17) |
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| 45 | compat_symbol (libc, __clock_getcpuclockid, clock_getcpuclockid, GLIBC_2_2); |
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| 46 | #endif |
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| 47 | |
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