diff options
Diffstat (limited to 'nuttx/sched/sig_procmask.c')
| -rw-r--r-- | nuttx/sched/sig_procmask.c | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/nuttx/sched/sig_procmask.c b/nuttx/sched/sig_procmask.c new file mode 100644 index 0000000000..b733bac0ec --- /dev/null +++ b/nuttx/sched/sig_procmask.c @@ -0,0 +1,172 @@ +/************************************************************ + * sig_procmask.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 <sys/types.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 <nuttx/os_external.h> +#include "os_internal.h" +#include "sig_internal.h" + +/************************************************************ + * Definitions + ************************************************************/ + +/************************************************************ + * Private Type Declarations + ************************************************************/ + +/************************************************************ + * Global Variables + ************************************************************/ + +/************************************************************ + * Private Variables + ************************************************************/ + +/************************************************************ + * Private Function Prototypes + ************************************************************/ + +/************************************************************ + * Public Functions + ************************************************************/ + +/************************************************************ + * Function: 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, const sigset_t *set, sigset_t *oset) +{ + _TCB *rtcb = (_TCB*)g_readytorun.head; + sigset_t oldsigprocmask; + uint32 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; + } /* end switch */ + irqrestore(saved_state); + + /* Now, process any pending signals that were just unmasked */ + + sig_unmaskpendingsignal(); + } /* end if */ + + sched_unlock(); + return ret; +} |