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incubator-nuttx/include/signal.h

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/********************************************************************************
* include/signal.h
*
* Copyright (C) 2007-2009, 2011 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 __SIGNAL_H
#define __SIGNAL_H
/********************************************************************************
* Included Files
********************************************************************************/
#include <nuttx/config.h>
#include <nuttx/compiler.h>
#include <stdint.h>
#include <time.h>
/********************************************************************************
* Pre-processor Definitions
********************************************************************************/
/* Signal set management definitions and macros. */
#define NULL_SIGNAL_SET ((sigset_t)0x00000000)
#define ALL_SIGNAL_SET ((sigset_t)0xffffffff)
#define MIN_SIGNO 0
#define MAX_SIGNO 31
#define GOOD_SIGNO(s) ((((unsigned)(s))<=MAX_SIGNO))
#define SIGNO2SET(s) ((sigset_t)1 << (s))
/* All signals are "real time" signals */
#define SIGRTMIN 0 /* First real time signal */
#define SIGRTMAX 31 /* Last real time signal */
/* A few of the real time signals are used within the OS. They have
* default values that can be overridden from the configuration file. The
* rest are all user signals:
*/
#ifndef CONFIG_SIG_SIGUSR1
#define SIGUSR1 0 /* User signal 1 */
#else
#define SIGUSR1 CONFIG_SIG_SIGUSR1
#endif
#ifndef CONFIG_SIG_SIGUSR2
#define SIGUSR2 1 /* User signal 2 */
#else
#define SIGUSR2 CONFIG_SIG_SIGUSR2
#endif
#ifndef CONFIG_SIG_SIGALARM
#define SIGALRM 2 /* Default signal used with POSIX timers (used only */
/* no other signal is provided) */
#else
#define SIGALRM CONFIG_SIG_SIGALARM
#endif
#ifndef CONFIG_DISABLE_PTHREAD
#ifndef CONFIG_SIG_SIGCONDTIMEDOUT
#define SIGCONDTIMEDOUT 3 /* Used in the implementation of pthread_cond_timedwait */
#else
#define SIGCONDTIMEDOUT CONFIG_SIG_SIGCONDTIMEDOUT
#endif
#endif
/* SIGWORK is used to wake up various internal, NuttX worker thread */
#if defined(CONFIG_SCHED_WORKQUEUE) || defined(CONFIG_PAGING)
#ifndef CONFIG_SIG_SIGWORK
#define SIGWORK 4 /* Used to wake up the work queue */
#else
#define SIGWORK CONFIG_SIG_SIGWORK
#endif
#endif
/* sigprocmask() "how" definitions. Only one of the following can be specified: */
#define SIG_BLOCK 1 /* Block the given signals */
#define SIG_UNBLOCK 2 /* Unblock the given signals */
#define SIG_SETMASK 3 /* Set the signal mask to the current set */
/* struct sigaction flag values */
#define SA_NOCLDSTOP 1 /* Do not generate SIGCHILD when
* children stop (ignored) */
#define SA_SIGINFO 2 /* Invoke the signal-catching function
* with 3 args instead of 1
* (always assumed) */
/* These are the possible values of the signfo si_code field */
#define SI_USER 0 /* Signal sent from kill, raise, or abort */
#define SI_QUEUE 1 /* Signal sent from sigqueue */
#define SI_TIMER 2 /* Signal is result of timer expiration */
#define SI_ASYNCIO 3 /* Signal is the result of asynch IO completion */
#define SI_MESGQ 4 /* Signal generated by arrival of a message on an */
/* empty message queue */
/* Values for the sigev_notify field of struct sigevent */
#define SIGEV_NONE 0 /* No notification desired */
#define SIGEV_SIGNAL 1 /* Notify via signal */
/* Special values of sigaction (all treated like NULL) */
#define SIG_ERR ((CODE void*)-1)
#define SIG_DFL ((CODE void*)0)
#define SIG_IGN ((CODE void*)0)
/********************************************************************************
* Global Type Declarations
********************************************************************************/
/* This defines a set of 32 signals (numbered 0 through 31). */
typedef uint32_t sigset_t; /* Bit set of 32 signals */
/* This defines the type of the siginfo si_value field */
union sigval
{
int sival_int; /* Integer value */
FAR void *sival_ptr; /* Pointer value */
};
/* This structure contains elements that define a queue signal. The following is
* used to attach a signal to a message queue to notify a task when a message is
* available on a queue
*/
struct sigevent
{
uint8_t sigev_notify; /* Notification method: SIGEV_SIGNAL or SIGEV_NONE */
uint8_t sigev_signo; /* Notification signal */
union sigval sigev_value; /* Data passed with notification */
};
/* The following types is used to pass parameters to/from signal handlers */
struct siginfo
{
uint8_t si_signo; /* Identifies signal */
uint8_t si_code; /* Source: SI_USER, SI_QUEUE, SI_TIMER, SI_ASYNCIO, or SI_MESGQ */
union sigval si_value; /* Data passed with signal */
};
typedef struct siginfo siginfo_t;
/* The following structure defines the action to take for given signal */
struct sigaction
{
union
{
CODE void (*_sa_handler)(int);
CODE void (*_sa_sigaction)(int, FAR siginfo_t *, FAR void *);
} sa_u;
sigset_t sa_mask;
int sa_flags;
};
#define sa_handler sa_u._sa_handler
#define sa_sigaction sa_u._sa_sigaction
/********************************************************************************
* Global Variables
********************************************************************************/
/********************************************************************************
* Global Function Prototypes
********************************************************************************/
#ifdef __cplusplus
#define EXTERN extern "C"
extern "C" {
#else
#define EXTERN extern
#endif
EXTERN int kill(pid_t, int);
EXTERN int sigemptyset(FAR sigset_t *set);
EXTERN int sigfillset(FAR sigset_t *set);
EXTERN int sigaddset(FAR sigset_t *set, int signo);
EXTERN int sigdelset(FAR sigset_t *set, int signo);
EXTERN int sigismember(FAR const sigset_t *set, int signo);
EXTERN int sigaction(int sig, FAR const struct sigaction *act, FAR struct sigaction *oact);
EXTERN int sigprocmask(int how, FAR const sigset_t *set, FAR sigset_t *oset);
EXTERN int sigpending(FAR sigset_t *set);
EXTERN int sigsuspend(FAR const sigset_t *sigmask);
EXTERN int sigwaitinfo(FAR const sigset_t *set, FAR struct siginfo *value);
EXTERN int sigtimedwait(FAR const sigset_t *set, FAR struct siginfo *value,
FAR const struct timespec *timeout);
#ifdef CONFIG_CAN_PASS_STRUCTS
EXTERN int sigqueue(int pid, int signo, union sigval value);
#else
EXTERN int sigqueue(int pid, int signo, FAR void *sival_ptr);
#endif
#undef EXTERN
#ifdef __cplusplus
}
#endif
#endif /* __SIGNAL_H */
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