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