73 lines
2.3 KiB
C
73 lines
2.3 KiB
C
/****************************************************************************
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* libs/libc/sched/clock_getcpuclockid.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <time.h>
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#include <nuttx/clock.h>
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#include <nuttx/sched.h>
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#include <nuttx/signal.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: clock_getcpuclockid
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*
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* Description:
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* The function shall return clock id of the CPU-time clock of the process
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* specified by pid
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*
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* Input Parameters:
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* pid - the specified process id
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* clockid - the clock type that need to setup
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*
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* Returned Value:
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* Return 0 on success, return error number on error
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*
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****************************************************************************/
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int clock_getcpuclockid(pid_t pid, FAR clockid_t *clockid)
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{
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/* If the pid is 0, we need to use the pid of current process */
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if (pid == 0)
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{
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pid = _SCHED_GETPID();
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}
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else if (_SIG_KILL(pid, 0) < 0)
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{
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return ERROR;
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}
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/* For clock_getcpuclockid, the clock type are
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* CLOCK_PROCESS_CPUTIME_ID
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*/
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*clockid = (pid << CLOCK_SHIFT) | CLOCK_PROCESS_CPUTIME_ID;
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return OK;
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}
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