205 lines
7.5 KiB
C
205 lines
7.5 KiB
C
/********************************************************************************
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* signal.h
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*
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* Copyright (C) 2007 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name Gregory Nutt nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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********************************************************************************/
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#ifndef __SIGNAL_H
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#define __SIGNAL_H
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/********************************************************************************
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* Included Files
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********************************************************************************/
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#include <nuttx/config.h>
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#include <nuttx/compiler.h>
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#include <time.h> /* Needed for struct timespec */
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#include <sys/types.h>
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/********************************************************************************
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* Compilations Switches
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********************************************************************************/
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/********************************************************************************
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* Definitions
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********************************************************************************/
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/* Signal set management definitions and macros. */
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#define NULL_SIGNAL_SET ((sigset_t)0x00000000)
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#define ALL_SIGNAL_SET ((sigset_t)0xffffffff)
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#define MIN_SIGNO 0
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#define MAX_SIGNO 31
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#define GOOD_SIGNO(s) (((s)>=MIN_SIGNO)&&((s)<=MAX_SIGNO))
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#define SIGNO2SET(s) ((sigset_t)1 << (s))
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/* All signals are "real time" signals */
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#define SIGRTMIN 0 /* First real time signal */
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#define SIGRTMAX 31 /* Last real time signal */
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/* A few of the real time signals are used within the OS: */
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#define SIGALRM 2 /* Default signal used with POSIX timers (used only */
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/* no other signal is provided) */
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#define SIGCONDTIMEDOUT 3 /* Used in the implementation of */
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/* pthread_cond_timedwait */
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/* sigprocmask() "how" definitions. Only one of the following can be specified: */
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#define SIG_BLOCK 1 /* Block the given signals */
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#define SIG_UNBLOCK 2 /* Unblock the given signals */
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#define SIG_SETMASK 3 /* Set the signal mask to the current set */
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/* struct sigaction flag values */
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#define SA_NOCLDSTOP 1 /* Do not generate SIGCHILD when
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* children stop (ignored) */
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#define SA_SIGINFO 2 /* Invoke the signal-catching function
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* with 3 args instead of 1
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* (always assumed) */
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/* These are the possible values of the signfo si_code field */
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#define SI_USER 0 /* Signal sent from kill, raise, or abort */
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#define SI_QUEUE 1 /* Signal sent from sigqueue */
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#define SI_TIMER 2 /* Signal is result of timer expiration */
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#define SI_ASYNCIO 3 /* Signal is the result of asynch IO completion */
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#define SI_MESGQ 4 /* Signal generated by arrival of a message on an */
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/* empty message queue */
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/* Values for the sigev_notify field of struct sigevent */
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#define SIGEV_NONE 0 /* No notification desired */
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#define SIGEV_SIGNAL 1 /* Notify via signal */
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/* Special values of sigaction (all treated like NULL) */
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#define SIG_DFL ((CODE void*)0)
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#define SIG_IGN ((CODE void*)0)
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/********************************************************************************
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* Global Type Declarations
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********************************************************************************/
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/* This defines a set of 32 signals (numbered 0 through 31). */
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typedef uint32 sigset_t; /* Bit set of 32 signals */
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/* This defines the type of the siginfo si_value field */
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union sigval
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{
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int sival_int; /* Integer value */
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void *sival_ptr; /* Pointer value */
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};
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/* This structure contains elements that define a queue signal. The following is
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* used to attach a signal to a message queue to notify a task when a message is
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* available on a queue
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*/
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struct sigevent
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{
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ubyte sigev_notify; /* Notification method: SIGEV_SIGNAL or SIGEV_NONE */
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ubyte sigev_signo; /* Notification signal */
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union sigval sigev_value; /* Data passed with notification */
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};
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/* The following types is used to pass parameters to/from signal handlers */
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struct siginfo
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{
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ubyte si_signo; /* Identifies signal */
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ubyte si_code; /* Source: SI_USER, SI_QUEUE, SI_TIMER, SI_ASYNCIO, or SI_MESGQ */
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union sigval si_value; /* Data passed with signal */
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};
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typedef struct siginfo siginfo_t;
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/* The following structure defines the action to take for given signal */
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struct sigaction
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{
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union
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{
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CODE void (*_sa_handler)(int);
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CODE void (*_sa_sigaction)(int, FAR siginfo_t *, FAR void *);
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} sa_u;
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sigset_t sa_mask;
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int sa_flags;
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};
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#define sa_handler sa_u._sa_handler
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#define sa_sigaction sa_u._sa_sigaction
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/********************************************************************************
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* Global Variables
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********************************************************************************/
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/********************************************************************************
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* Global Function Prototypes
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********************************************************************************/
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#ifdef __cplusplus
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#define EXTERN extern "C"
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extern "C" {
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#else
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#define EXTERN extern
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#endif
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EXTERN int kill(pid_t, int);
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EXTERN int sigemptyset(sigset_t *set);
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EXTERN int sigfillset(sigset_t *set);
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EXTERN int sigaddset(sigset_t *set, int signo);
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EXTERN int sigdelset(sigset_t *set, int signo);
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EXTERN int sigismember(const sigset_t *set, int signo);
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EXTERN int sigaction(int sig, const struct sigaction *act, struct sigaction *oact);
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EXTERN int sigprocmask(int how, const sigset_t *set, sigset_t *oset);
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EXTERN int sigpending(sigset_t *set);
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EXTERN int sigsuspend(const sigset_t *sigmask);
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EXTERN int sigwaitinfo(const sigset_t *set, struct siginfo *value);
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EXTERN int sigtimedwait(const sigset_t *set, struct siginfo *value,
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const struct timespec *timeout);
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#ifdef CONFIG_CAN_PASS_STRUCTS
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EXTERN int sigqueue(int pid, int signo, const union sigval value);
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#else
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EXTERN int sigqueue(int pid, int signo, void *sival_ptr);
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#endif
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* __SIGNAL_H */
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