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Diffstat (limited to 'nuttx/sched/sig_procmask.c')
| -rw-r--r-- | nuttx/sched/sig_procmask.c | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/nuttx/sched/sig_procmask.c b/nuttx/sched/sig_procmask.c new file mode 100644 index 000000000..c67159589 --- /dev/null +++ b/nuttx/sched/sig_procmask.c @@ -0,0 +1,180 @@ +/**************************************************************************** + * 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; +} |