74 lines
2.5 KiB
C
74 lines
2.5 KiB
C
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/****************************************************************************
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* libs/libc/unistd/lib_getpgid.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/sched.h>
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#include <nuttx/signal.h>
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#include <unistd.h>
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#include <errno.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: getpgid
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*
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* Description:
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* Get the Process Group ID of the required process id. But since NuttX do
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* not support process group, so the process group id are same as process
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* id, so this method will return the pid that transferred in directly,
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* which is same as getpgrp() method
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*
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* Input parameters:
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* pid - the process id that required to fetch the process group id
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*
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* Returned Value:
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* getpgid() shall return a process group ID. Otherwise, it shall return
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* (pid_t)-1 and set errno to indicate the error. If the given process id
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* are invalid, set errno as EINVAL, if the given process id do not exist,
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* set errno as ESRCH
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*
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****************************************************************************/
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pid_t getpgid(pid_t pid)
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{
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if (pid < 0)
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{
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set_errno(EINVAL);
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return INVALID_PROCESS_ID;
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}
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if (pid == 0)
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{
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return getpgrp();
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}
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else if (_SIG_KILL(pid, 0) < 0)
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{
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return INVALID_PROCESS_ID;
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}
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return pid;
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}
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