| /**************************************************************************** |
| * sched/sig_internal.h |
| * |
| * Copyright (C) 2007-2009 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 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. |
| * |
| ****************************************************************************/ |
| |
| #ifndef __SIG_INTERNAL_H |
| #define __SIG_INTERNAL_H |
| |
| /**************************************************************************** |
| * Included Files |
| ****************************************************************************/ |
| |
| #include <nuttx/compiler.h> |
| |
| #include <stdint.h> |
| #include <queue.h> |
| #include <sched.h> |
| |
| #include <nuttx/kmalloc.h> |
| |
| /**************************************************************************** |
| * Definitions |
| ****************************************************************************/ |
| |
| /* The following definition determines the number of signal structures to |
| * allocate in a block |
| */ |
| |
| #define NUM_SIGNAL_ACTIONS 16 |
| #define NUM_PENDING_ACTIONS 16 |
| #define NUM_PENDING_INT_ACTIONS 8 |
| #define NUM_SIGNALS_PENDING 16 |
| #define NUM_INT_SIGNALS_PENDING 8 |
| |
| /**************************************************************************** |
| * Public Type Definitions |
| ****************************************************************************/ |
| |
| enum sigalloc_e |
| { |
| SIG_ALLOC_FIXED = 0, /* pre-allocated; never freed */ |
| SIG_ALLOC_DYN, /* dynamically allocated; free when unused */ |
| SIG_ALLOC_IRQ /* Preallocated, reserved for interrupt handling */ |
| }; |
| typedef enum sigalloc_e sigalloc_t; |
| |
| /* The following defines the sigaction queue entry */ |
| |
| struct sigactq |
| { |
| FAR struct sigactq *flink; /* Forward link */ |
| struct sigaction act; /* Sigaction data */ |
| uint8_t signo; /* Signal associated with action */ |
| }; |
| typedef struct sigactq sigactq_t; |
| |
| /* The following defines the queue structure within each TCB |
| * to hold pending signals received by the task. These are signals that |
| * cannot be processed because: (1) the task is not waiting for them, or |
| * (2) the task has no action associated with the signal. |
| */ |
| |
| struct sigpendq |
| { |
| FAR struct sigpendq *flink; /* Forward link */ |
| siginfo_t info; /* Signal information */ |
| uint8_t type; /* (Used to manage allocations) */ |
| }; |
| typedef struct sigpendq sigpendq_t; |
| |
| /* The following defines the queue structure within each TCB |
| * to hold queued signal actions that need action by the task |
| */ |
| |
| struct sigq_s |
| { |
| FAR struct sigq_s *flink; /* Forward link */ |
| union |
| { |
| void (*sighandler)(int signo, siginfo_t *info, void *context); |
| } action; /* Signal action */ |
| sigset_t mask; /* Additional signals to mask while the |
| * the signal-catching functin executes */ |
| siginfo_t info; /* Signal information */ |
| uint8_t type; /* (Used to manage allocations) */ |
| }; |
| typedef struct sigq_s sigq_t; |
| |
| /**************************************************************************** |
| * Global Variables |
| ****************************************************************************/ |
| |
| /* The g_sigfreeaction data structure is a list of available signal action |
| * structures. |
| */ |
| |
| extern sq_queue_t g_sigfreeaction; |
| |
| /* The g_sigpendingaction data structure is a list of available pending |
| * signal action structures. |
| */ |
| |
| extern sq_queue_t g_sigpendingaction; |
| |
| /* The g_sigpendingirqaction is a list of available pending signal actions |
| * that are reserved for use by interrupt handlers. |
| */ |
| |
| extern sq_queue_t g_sigpendingirqaction; |
| |
| /* The g_sigpendingsignal data structure is a list of available pending |
| * signal structures. |
| */ |
| |
| extern sq_queue_t g_sigpendingsignal; |
| |
| /* The g_sigpendingirqsignal data structure is a list of available pending |
| * signal structures that are reserved for use by interrupt handlers. |
| */ |
| |
| extern sq_queue_t g_sigpendingirqsignal; |
| |
| /**************************************************************************** |
| * Public Function Prototypes |
| ****************************************************************************/ |
| |
| /* Internal signal-related interfaces ***************************************/ |
| |
| /* sig_intialize.c */ |
| |
| extern void weak_function sig_initialize(void); |
| extern void sig_allocateactionblock(void); |
| |
| /* sig_action.c */ |
| |
| extern void sig_releaseaction(FAR sigactq_t *sigact); |
| |
| /* sig_pending.c */ |
| |
| extern sigset_t sig_pendingset(FAR _TCB *stcb); |
| |
| /* In files of the same name */ |
| |
| extern FAR sigq_t *sig_allocatependingsigaction(void); |
| extern void sig_cleanup(FAR _TCB *stcb); |
| extern void sig_deliver(FAR _TCB *stcb); |
| extern FAR sigactq_t *sig_findaction(FAR _TCB *stcb, int signo); |
| extern int sig_lowest(sigset_t *set); |
| #ifdef CONFIG_CAN_PASS_STRUCTS |
| extern int sig_mqnotempty(int tid, int signo, union sigval value); |
| #else |
| extern int sig_mqnotempty(int tid, int signo, |
| void *sival_ptr); |
| #endif |
| extern int sig_received(FAR _TCB *stcb, siginfo_t *info); |
| extern void sig_releasependingsigaction(FAR sigq_t *sigq); |
| extern void sig_releasependingsignal(FAR sigpendq_t *sigpend); |
| extern FAR sigpendq_t *sig_removependingsignal(FAR _TCB *stcb, int signo); |
| extern void sig_unmaskpendingsignal(void); |
| |
| #endif /* __SIG_INTERNAL_H */ |
