8b098e598a
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@108 42af7a65-404d-4744-a932-0658087f49c3
135 lines
4.1 KiB
C
135 lines
4.1 KiB
C
/************************************************************
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* sig_kill.c
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*
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* Copyright (C) 2007 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name Gregory Nutt nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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 <sched.h>
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#include <errno.h>
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#include <debug.h>
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#include "os_internal.h"
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#include "sig_internal.h"
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/************************************************************
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* Global Functions
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************************************************************/
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/************************************************************
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* Function: kill
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*
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* Description:
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* The kill() system call can be used to send any signal to
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* any task.
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*
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* Limitation: Sending of signals to 'process groups' is
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* not supported in NuttX
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*
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* Parameters:
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* pid - The id of the task to receive the signal. The
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* POSIX kill specification encodes process group
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* information as zero and negative pid values. Only
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* positive, non-zero values of pid are supported by this
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* implementation.
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* signo - The signal number to send.
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*
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* Return Value:
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* On success (at least one signal was sent), zero is
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* returned. On error, -1 is returned, and errno is set
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* appropriately.
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*
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* EINVAL An invalid signal was specified.
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* EPERM The process does not have permission to send the
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* signal to any of the target processes.
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* ESRCH The pid or process group does not exist.
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* ENOSYS Do not support sending signals to process groups.
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*
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* Assumptions:
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*
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************************************************************/
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int kill(pid_t pid, int signo)
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{
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FAR _TCB *stcb;
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siginfo_t info;
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int ret = ERROR;
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/* We do not support sending signals to process groups */
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if (pid <= 0)
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{
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*get_errno_ptr() = ENOSYS;
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return ERROR;
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}
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/* Make sure that the signal is valid */
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if (!GOOD_SIGNO(signo))
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{
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*get_errno_ptr() = EINVAL;
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return ERROR;
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}
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/* Keep things stationary through the following */
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sched_lock();
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/* Get the TCB of the receiving task */
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stcb = sched_gettcb(pid);
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dbg("TCB=0x%08x signo=%d\n", stcb, signo);
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if (!stcb)
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{
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*get_errno_ptr() = ESRCH;
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sched_unlock();
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return ERROR;
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}
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/* Create the siginfo structure */
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info.si_signo = signo;
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info.si_code = SI_USER;
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info.si_value.sival_ptr = NULL;
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/* Send the signal */
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ret = sig_received(stcb, &info);
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sched_unlock();
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return ret;
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}
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