You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
180 lines
6.2 KiB
180 lines
6.2 KiB
/**************************************************************************** |
|
* sched/sig_procmask.c |
|
* |
|
* Copyright (C) 2007-2009 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 <wdog.h> |
|
#include <assert.h> |
|
#include <debug.h> |
|
#include <sched.h> |
|
#include <nuttx/kmalloc.h> |
|
#include <nuttx/arch.h> |
|
|
|
#include "os_internal.h" |
|
#include "sig_internal.h" |
|
|
|
/**************************************************************************** |
|
* Definitions |
|
****************************************************************************/ |
|
|
|
/**************************************************************************** |
|
* Private Type Declarations |
|
****************************************************************************/ |
|
|
|
/**************************************************************************** |
|
* Global Variables |
|
****************************************************************************/ |
|
|
|
/**************************************************************************** |
|
* Private Variables |
|
****************************************************************************/ |
|
|
|
/**************************************************************************** |
|
* Private Function Prototypes |
|
****************************************************************************/ |
|
|
|
/**************************************************************************** |
|
* Public Functions |
|
****************************************************************************/ |
|
|
|
/**************************************************************************** |
|
* 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. |
|
* |
|
* 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 |
|
* |
|
* Return Value: |
|
* 0 (OK), or -1 (ERROR) if how is invalid. |
|
* |
|
* Assumptions: |
|
* |
|
****************************************************************************/ |
|
|
|
int sigprocmask(int how, FAR const sigset_t *set, FAR sigset_t *oset) |
|
{ |
|
FAR _TCB *rtcb = (FAR _TCB*)g_readytorun.head; |
|
sigset_t oldsigprocmask; |
|
irqstate_t saved_state; |
|
int ret = OK; |
|
|
|
sched_lock(); |
|
|
|
/* Return the old signal mask if requested */ |
|
|
|
oldsigprocmask = rtcb->sigprocmask; |
|
if (oset) |
|
{ |
|
*oset = oldsigprocmask; |
|
} |
|
|
|
/* Modify the current signal mask if so requested */ |
|
|
|
if (set) |
|
{ |
|
/* Some of these operations are non-atomic. We need to protect |
|
* ourselves from attempts to process signals from interrupts |
|
*/ |
|
|
|
saved_state = irqsave(); |
|
|
|
/* 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 = ERROR; |
|
break; |
|
} |
|
|
|
irqrestore(saved_state); |
|
|
|
/* Now, process any pending signals that were just unmasked */ |
|
|
|
sig_unmaskpendingsignal(); |
|
} |
|
|
|
sched_unlock(); |
|
return ret; |
|
}
|
|
|