221 lines
7.5 KiB
C
221 lines
7.5 KiB
C
/****************************************************************************
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* sched/signal/sig_procmask.c
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*
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* Copyright (C) 2007-2009, 2014, 2016-2017 Gregory Nutt. All rights
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* reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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 NuttX 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 <unistd.h>
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#include <signal.h>
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#include <time.h>
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#include <sched.h>
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#include <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/irq.h>
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#include <nuttx/arch.h>
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#include <nuttx/wdog.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/signal.h>
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#include "sched/sched.h"
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#include "signal/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: nxsig_procmask
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*
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* Description:
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* This function allows the calling process to examine and/or change its
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* signal mask. If the 'set' is not NULL, then it points to a set of
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* signals to be used to change the currently blocked set. The value of
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* 'how' indicates the manner in which the set is changed.
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*
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* If there any pending unblocked signals after the call to
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* nxsig_procmask(), those signals will be delivered before
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* nxsig_procmask() returns.
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*
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* If nxsig_procmask() fails, the signal mask of the process is not changed
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* by this function call.
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*
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* This is an internal OS interface. It is functionally equivalent to
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* sigprocmask() except that it does not modify the errno value.
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*
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* Input Parameters:
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* how - How the signal mast will be changed:
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* SIG_BLOCK - The resulting set is the union of the current set
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* and the signal set pointed to by 'set'.
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* SIG_UNBLOCK - The resulting set is the intersection of the current
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* set and the complement of the signal set pointed to
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* by 'set'.
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* SIG_SETMASK - The resulting set is the signal set pointed to by
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* 'set'.
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* set - Location of the new signal mask
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* oset - Location to store the old signal mask
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*
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* Returned Value:
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* This is an internal OS interface and should not be used by applications.
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* It follows the NuttX internal error return policy: Zero (OK) is
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* returned on success. A negated errno value is returned on failure.
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*
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* EINVAL - The 'how' argument is invalid.
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*
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****************************************************************************/
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int nxsig_procmask(int how, FAR const sigset_t *set, FAR sigset_t *oset)
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{
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FAR struct tcb_s *rtcb = this_task();
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sigset_t oldsigprocmask;
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irqstate_t flags;
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int ret = OK;
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sched_lock();
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/* Return the old signal mask if requested */
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oldsigprocmask = rtcb->sigprocmask;
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if (oset != NULL)
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{
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*oset = oldsigprocmask;
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}
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/* Modify the current signal mask if so requested */
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if (set != NULL)
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{
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/* Some of these operations are non-atomic. We need to protect
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* ourselves from attempts to process signals from interrupts
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*/
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flags = enter_critical_section();
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/* Okay, determine what we are supposed to do */
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switch (how)
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{
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/* The resulting set is the union of the current set and the
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* signal set pointed to by set.
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*/
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case SIG_BLOCK:
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rtcb->sigprocmask |= *set;
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break;
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/* The resulting set is the intersection of the current set and
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* the complement of the signal set pointed to by _set.
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*/
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case SIG_UNBLOCK:
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rtcb->sigprocmask &= ~(*set);
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break;
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/* The resulting set is the signal set pointed to by set. */
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case SIG_SETMASK:
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rtcb->sigprocmask = *set;
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break;
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default:
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ret = -EINVAL;
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break;
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}
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leave_critical_section(flags);
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/* Now, process any pending signals that were just unmasked */
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nxsig_unmask_pendingsignal();
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}
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sched_unlock();
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return ret;
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}
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/****************************************************************************
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* Name: sigprocmask
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*
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* Description:
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* This function allows the calling process to examine and/or change its
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* signal mask. If the 'set' is not NULL, then it points to a set of
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* signals to be used to change the currently blocked set. The value of
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* 'how' indicates the manner in which the set is changed.
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*
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* If there any pending unblocked signals after the call to sigprocmask(),
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* those signals will be delivered before sigprocmask() returns.
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*
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* If sigprocmask() fails, the signal mask of the process is not changed
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* by this function call.
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*
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* Input Parameters:
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* how - How the signal mast will be changed:
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* SIG_BLOCK - The resulting set is the union of the current set
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* and the signal set pointed to by 'set'.
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* SIG_UNBLOCK - The resulting set is the intersection of the current
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* set and the complement of the signal set pointed to
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* by 'set'.
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* SIG_SETMASK - The resulting set is the signal set pointed to by
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* 'set'.
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* set - Location of the new signal mask
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* oset - Location to store the old signal mask
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*
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* Returned Value:
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* This function will return 0 (OK) on success or -1 (ERROR) if how is
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* invalid. In the latter case, the errno variable will be set to EINVAL.
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*
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****************************************************************************/
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int sigprocmask(int how, FAR const sigset_t *set, FAR sigset_t *oset)
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{
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int ret;
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/* Let nxsig_procmask do all of the work */
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ret = nxsig_procmask(how, set, oset);
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if (ret < 0)
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{
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set_errno(-ret);
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ret = ERROR;
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}
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return ret;
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}
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