339 lines
12 KiB
C
339 lines
12 KiB
C
/********************************************************************************
|
|
* include/signal.h
|
|
*
|
|
* Copyright (C) 2007-2009, 2011, 2013-2016 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.
|
|
*
|
|
********************************************************************************/
|
|
|
|
#ifndef __INCLUDE_SIGNAL_H
|
|
#define __INCLUDE_SIGNAL_H
|
|
|
|
/********************************************************************************
|
|
* Included Files
|
|
********************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
#include <nuttx/compiler.h>
|
|
|
|
#include <stdint.h>
|
|
#include <time.h>
|
|
|
|
#ifdef CONFIG_SIG_EVTHREAD
|
|
# include <pthread.h> /* Needed for pthread_attr_t, includes this file */
|
|
#endif
|
|
|
|
/********************************************************************************
|
|
* 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 MIN_SIGNO /* First real time signal */
|
|
#define SIGRTMAX MAX_SIGNO /* 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.
|
|
*
|
|
* The signal number zero is wasted for the most part. It is a valid
|
|
* signal number, but has special meaning at many interfaces (e.g., Kill()).
|
|
*
|
|
* These are the semi-standard signal definitions:
|
|
*/
|
|
|
|
#ifndef CONFIG_SIG_SIGUSR1
|
|
# define SIGUSR1 1 /* User signal 1 */
|
|
#else
|
|
# define SIGUSR1 CONFIG_SIG_SIGUSR1
|
|
#endif
|
|
|
|
#ifndef CONFIG_SIG_SIGUSR2
|
|
# define SIGUSR2 2 /* User signal 2 */
|
|
#else
|
|
# define SIGUSR2 CONFIG_SIG_SIGUSR2
|
|
#endif
|
|
|
|
#ifndef CONFIG_SIG_SIGALARM
|
|
# define SIGALRM 3 /* Default signal used with POSIX timers (used only */
|
|
/* no other signal is provided) */
|
|
#else
|
|
# define SIGALRM CONFIG_SIG_SIGALARM
|
|
#endif
|
|
|
|
#ifdef CONFIG_SCHED_HAVE_PARENT
|
|
# ifndef CONFIG_SIG_SIGCHLD
|
|
# define SIGCHLD 4 /* Used by child threads to signal parent thread */
|
|
# else
|
|
# define SIGCHLD CONFIG_SIG_SIGCHLD
|
|
# endif
|
|
#endif
|
|
|
|
#ifdef CONFIG_FS_AIO
|
|
# ifndef CONFIG_SIG_POLL
|
|
# define SIGPOLL 5 /* Sent when an asynchronous I/O event occurs */
|
|
# else
|
|
# define SIGPOLL CONFIG_SIG_POLL
|
|
# endif
|
|
#endif
|
|
|
|
/* The following are non-standard signal definitions */
|
|
|
|
#ifndef CONFIG_DISABLE_PTHREAD
|
|
# ifndef CONFIG_SIG_SIGCONDTIMEDOUT
|
|
# define SIGCONDTIMEDOUT 16 /* 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 17 /* 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 << 0) /* Do not generate SIGCHILD when
|
|
* children stop (ignored) */
|
|
#define SA_SIGINFO (1 << 1) /* Invoke the signal-catching function
|
|
* with 3 args instead of 1
|
|
* (always assumed) */
|
|
#define SA_NOCLDWAIT (1 << 2) /* If signo=SIGCHLD, exit status of child
|
|
* processes will be discarded */
|
|
|
|
/* 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 */
|
|
#define CLD_EXITED 5 /* Child has exited (SIGCHLD only) */
|
|
#define CLD_KILLED 6 /* Child was killed (SIGCHLD only) */
|
|
#define CLD_DUMPED 7 /* Child terminated abnormally (SIGCHLD only) */
|
|
#define CLD_TRAPPED 8 /* Traced child has trapped (SIGCHLD only) */
|
|
#define CLD_STOPPED 9 /* Child has stopped (SIGCHLD only) */
|
|
#define CLD_CONTINUED 10 /* Stopped child had continued (SIGCHLD only) */
|
|
|
|
/* Values for the sigev_notify field of struct sigevent */
|
|
|
|
#define SIGEV_NONE 0 /* No asynchronous notification is delivered */
|
|
#define SIGEV_SIGNAL 1 /* Notify via signal,with an application-defined value */
|
|
#ifdef CONFIG_SIG_EVTHREAD
|
|
# define SIGEV_THREAD 3 /* A notification function is called */
|
|
#endif
|
|
|
|
/* Special values of of sa_handler used by sigaction and sigset. They are all
|
|
* treated like NULL for now. This is okay for SIG_DFL and SIG_IGN because
|
|
* in NuttX, the default action for all signals is to ignore them.
|
|
*
|
|
* REVISIT: Need to distinguish the value of SIG_HOLD. It is needed in the
|
|
* implementation of sigset() but would need to be recognized in all signal
|
|
* functions that deal with signal disposition.
|
|
*/
|
|
|
|
#define SIG_ERR ((CODE void *)-1) /* And error occurred */
|
|
#define SIG_DFL ((CODE void *)0) /* Default is SIG_IGN for all signals */
|
|
#define SIG_IGN ((CODE void *)0) /* Ignore the signal */
|
|
#define SIG_HOLD ((CODE void *)1) /* Used only with sigset() */
|
|
|
|
/********************************************************************************
|
|
* Public Type Definitions
|
|
********************************************************************************/
|
|
|
|
/* This defines a set of 32 signals (numbered 0 through 31). */
|
|
|
|
typedef uint32_t sigset_t; /* Bit set of 32 signals */
|
|
#define __SIGSET_T_DEFINED 1
|
|
|
|
/* 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
|
|
*/
|
|
|
|
#ifdef CONFIG_CAN_PASS_STRUCTS
|
|
typedef CODE void (*sigev_notify_function_t)(union sigval value);
|
|
#else
|
|
typedef CODE void (*sigev_notify_function_t)(FAR void *sival_ptr);
|
|
#endif
|
|
|
|
struct sigevent
|
|
{
|
|
uint8_t sigev_notify; /* Notification method: SIGEV_SIGNAL, SIGEV_NONE, or SIGEV_THREAD */
|
|
uint8_t sigev_signo; /* Notification signal */
|
|
union sigval sigev_value; /* Data passed with notification */
|
|
|
|
#ifdef CONFIG_SIG_EVTHREAD
|
|
sigev_notify_function_t sigev_notify_function; /* Notification function */
|
|
FAR pthread_attr_t *sigev_notify_attributes; /* Notification attributes (not used) */
|
|
#endif
|
|
};
|
|
|
|
/* 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 */
|
|
uint8_t si_errno; /* Zero or errno value associated with signal */
|
|
union sigval si_value; /* Data passed with signal */
|
|
#ifdef CONFIG_SCHED_HAVE_PARENT
|
|
pid_t si_pid; /* Sending task ID */
|
|
int si_status; /* Exit value or signal (SIGCHLD only). */
|
|
#endif
|
|
};
|
|
|
|
typedef struct siginfo siginfo_t;
|
|
#define __SIGINFO_T_DEFINED 1
|
|
|
|
/* Non-standard convenience definition of signal handling function types.
|
|
* These should be used only internally within the NuttX signal logic.
|
|
*/
|
|
|
|
typedef CODE void (*_sa_handler_t)(int signo);
|
|
typedef CODE void (*_sa_sigaction_t)(int signo, FAR siginfo_t *siginfo,
|
|
FAR void *context);
|
|
|
|
/* The following structure defines the action to take for given signal */
|
|
|
|
struct sigaction
|
|
{
|
|
union
|
|
{
|
|
_sa_handler_t _sa_handler;
|
|
_sa_sigaction_t _sa_sigaction;
|
|
} sa_u;
|
|
sigset_t sa_mask;
|
|
int sa_flags;
|
|
};
|
|
|
|
/* Definitions that adjust the non-standard naming */
|
|
|
|
#define sa_handler sa_u._sa_handler
|
|
#define sa_sigaction sa_u._sa_sigaction
|
|
|
|
/********************************************************************************
|
|
* Public Function Prototypes
|
|
********************************************************************************/
|
|
|
|
#ifdef __cplusplus
|
|
#define EXTERN extern "C"
|
|
extern "C"
|
|
{
|
|
#else
|
|
#define EXTERN extern
|
|
#endif
|
|
|
|
int kill(pid_t, int);
|
|
int sigaction(int sig, FAR const struct sigaction *act,
|
|
FAR struct sigaction *oact);
|
|
int sigaddset(FAR sigset_t *set, int signo);
|
|
int sigdelset(FAR sigset_t *set, int signo);
|
|
int sigemptyset(FAR sigset_t *set);
|
|
int sigfillset(FAR sigset_t *set);
|
|
int sighold(int signo);
|
|
int sigismember(FAR const sigset_t *set, int signo);
|
|
int sigignore(int signo);
|
|
CODE void (*signal(int sig, CODE void (*func)(int signo)))(int signo);
|
|
int sigprocmask(int how, FAR const sigset_t *set, FAR sigset_t *oset);
|
|
int sigpause(int signo);
|
|
int sigpending(FAR sigset_t *set);
|
|
#ifdef CONFIG_CAN_PASS_STRUCTS
|
|
int sigqueue(int pid, int signo, union sigval value);
|
|
#else
|
|
int sigqueue(int pid, int signo, FAR void *sival_ptr);
|
|
#endif
|
|
int sigrelse(int signo);
|
|
CODE void (*sigset(int sig, CODE void (*func)(int signo)))(int signo);
|
|
int sigtimedwait(FAR const sigset_t *set, FAR struct siginfo *value,
|
|
FAR const struct timespec *timeout);
|
|
int sigsuspend(FAR const sigset_t *sigmask);
|
|
int sigwaitinfo(FAR const sigset_t *set, FAR struct siginfo *value);
|
|
|
|
#undef EXTERN
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
/********************************************************************************
|
|
* Minimal Type Definitions
|
|
********************************************************************************/
|
|
|
|
#else /* __INCLUDE_SIGNAL_H */
|
|
|
|
#include <stdint.h>
|
|
|
|
/* Avoid circular dependencies by assuring that simple type definitions are
|
|
* available in any inclusion ordering.
|
|
*/
|
|
|
|
#ifndef __SIGSET_T_DEFINED
|
|
typedef uint32_t sigset_t;
|
|
# define __SIGSET_T_DEFINED 1
|
|
#endif
|
|
|
|
#ifndef __SIGINFO_T_DEFINED
|
|
struct siginfo;
|
|
typedef struct siginfo siginfo_t;
|
|
# define __SIGINFO_T_DEFINED 1
|
|
#endif
|
|
|
|
#endif /* __INCLUDE_SIGNAL_H */
|