123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220 |
- /****************************************************************************
- * sched/signal/sig_procmask.c
- *
- * Copyright (C) 2007-2009, 2014, 2016-2017 Gregory Nutt. All rights
- * reserved.
- * Author: Gregory Nutt <gnutt@nuttx.org>
- *
- * 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 NuttX 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 <unistd.h>
- #include <signal.h>
- #include <time.h>
- #include <sched.h>
- #include <assert.h>
- #include <errno.h>
- #include <debug.h>
- #include <nuttx/irq.h>
- #include <nuttx/arch.h>
- #include <nuttx/wdog.h>
- #include <nuttx/kmalloc.h>
- #include <nuttx/signal.h>
- #include "sched/sched.h"
- #include "signal/signal.h"
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: nxsig_procmask
- *
- * Description:
- * This function allows the calling process to examine and/or change its
- * signal mask. If the 'set' is not NULL, then it points to a set of
- * signals to be used to change the currently blocked set. The value of
- * 'how' indicates the manner in which the set is changed.
- *
- * If there any pending unblocked signals after the call to
- * nxsig_procmask(), those signals will be delivered before
- * nxsig_procmask() returns.
- *
- * If nxsig_procmask() fails, the signal mask of the process is not changed
- * by this function call.
- *
- * This is an internal OS interface. It is functionally equivalent to
- * sigprocmask() except that it does not modify the errno value.
- *
- * Input Parameters:
- * how - How the signal mast will be changed:
- * SIG_BLOCK - The resulting set is the union of the current set
- * and the signal set pointed to by 'set'.
- * SIG_UNBLOCK - The resulting set is the intersection of the current
- * set and the complement of the signal set pointed to
- * by 'set'.
- * SIG_SETMASK - The resulting set is the signal set pointed to by
- * 'set'.
- * set - Location of the new signal mask
- * oset - Location to store the old signal mask
- *
- * Returned Value:
- * This is an internal OS interface and should not be used by applications.
- * It follows the NuttX internal error return policy: Zero (OK) is
- * returned on success. A negated errno value is returned on failure.
- *
- * EINVAL - The 'how' argument is invalid.
- *
- ****************************************************************************/
- int nxsig_procmask(int how, FAR const sigset_t *set, FAR sigset_t *oset)
- {
- FAR struct tcb_s *rtcb = this_task();
- sigset_t oldsigprocmask;
- irqstate_t flags;
- int ret = OK;
- sched_lock();
- /* Return the old signal mask if requested */
- oldsigprocmask = rtcb->sigprocmask;
- if (oset != NULL)
- {
- *oset = oldsigprocmask;
- }
- /* Modify the current signal mask if so requested */
- if (set != NULL)
- {
- /* Some of these operations are non-atomic. We need to protect
- * ourselves from attempts to process signals from interrupts
- */
- flags = enter_critical_section();
- /* Okay, determine what we are supposed to do */
- switch (how)
- {
- /* The resulting set is the union of the current set and the
- * signal set pointed to by set.
- */
- case SIG_BLOCK:
- rtcb->sigprocmask |= *set;
- break;
- /* The resulting set is the intersection of the current set and
- * the complement of the signal set pointed to by _set.
- */
- case SIG_UNBLOCK:
- rtcb->sigprocmask &= ~(*set);
- break;
- /* The resulting set is the signal set pointed to by set. */
- case SIG_SETMASK:
- rtcb->sigprocmask = *set;
- break;
- default:
- ret = -EINVAL;
- break;
- }
- leave_critical_section(flags);
- /* Now, process any pending signals that were just unmasked */
- nxsig_unmask_pendingsignal();
- }
- sched_unlock();
- return ret;
- }
- /****************************************************************************
- * Name: sigprocmask
- *
- * Description:
- * This function allows the calling process to examine and/or change its
- * signal mask. If the 'set' is not NULL, then it points to a set of
- * signals to be used to change the currently blocked set. The value of
- * 'how' indicates the manner in which the set is changed.
- *
- * If there any pending unblocked signals after the call to sigprocmask(),
- * those signals will be delivered before sigprocmask() returns.
- *
- * If sigprocmask() fails, the signal mask of the process is not changed
- * by this function call.
- *
- * Input Parameters:
- * how - How the signal mast will be changed:
- * SIG_BLOCK - The resulting set is the union of the current set
- * and the signal set pointed to by 'set'.
- * SIG_UNBLOCK - The resulting set is the intersection of the current
- * set and the complement of the signal set pointed to
- * by 'set'.
- * SIG_SETMASK - The resulting set is the signal set pointed to by
- * 'set'.
- * set - Location of the new signal mask
- * oset - Location to store the old signal mask
- *
- * Returned Value:
- * This function will return 0 (OK) on success or -1 (ERROR) if how is
- * invalid. In the latter case, the errno variable will be set to EINVAL.
- *
- ****************************************************************************/
- int sigprocmask(int how, FAR const sigset_t *set, FAR sigset_t *oset)
- {
- int ret;
- /* Let nxsig_procmask do all of the work */
- ret = nxsig_procmask(how, set, oset);
- if (ret < 0)
- {
- set_errno(-ret);
- ret = ERROR;
- }
- return ret;
- }
|