389 lines
15 KiB
C
389 lines
15 KiB
C
/****************************************************************************
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* include/signal.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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#ifndef __INCLUDE_SIGNAL_H
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#define __INCLUDE_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 <stdint.h>
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#include <time.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Signal set management definitions and macros. */
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#define MIN_SIGNO 1 /* Lowest valid signal number */
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#define MAX_SIGNO 63 /* Highest valid signal number */
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#define GOOD_SIGNO(s) ((((unsigned)(s)) <= MAX_SIGNO))
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/* Definitions for "standard" signals */
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#define SIGSTDMIN 1 /* First standard signal number */
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#define SIGSTDMAX 31 /* Last standard signal number */
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/* Definitions for "real time" signals */
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#define SIGRTMIN (SIGSTDMAX + 1) /* First real time signal */
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#define SIGRTMAX MAX_SIGNO /* Last real time signal */
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#define _NSIG (MAX_SIGNO + 1) /* Biggest signal number + 1 */
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#define NSIG _NSIG /* _NSIG variant commonly used */
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/* sigset_t is represented as an array of 32-b unsigned integers.
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* _SIGSET_NELEM is the allocated isze of the array
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*/
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#define _SIGSET_NELEM ((_NSIG + 31) >> 5)
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/* NuttX does not support all standard signal actions. NuttX supports what
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* are referred to as "real time" signals. The default action of all NuttX
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* signals is to simply ignore the signal. Certain signals can be
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* configured to support there default actions as indicated by NOTEs to the
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* following table.
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*
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* This is not POSIX compliant behavior! Per OpenGroup.org: The following
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* signals and default signal actions must be supported on all
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* implementations:
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*
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* ---------- ------- ----------------------------------------------------
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* Signal Default Description
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* Name Action
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* ---------- ------- ----------------------------------------------------
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* SIGABRT A Process abort signal
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* SIGALRM T (1) Alarm clock
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* SIGBUS A Access to an undefined portion of a memory object
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* SIGCHLD I Child process terminated, stopped
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* (or continued XSI extension)
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* SIGCONT C (2) Continue executing, if stopped
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* SIGFPE A Erroneous arithmetic operation
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* SIGHUP T Hangup
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* SIGILL A Illegal instruction
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* SIGINT T (3) Terminal interrupt signal
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* SIGKILL T (3) Kill (cannot be caught or ignored)
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* SIGPIPE T (7) Write on a pipe with no one to read it
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* SIGQUIT A Terminal quit signal
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* SIGSEGV A Invalid memory reference
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* SIGSTOP S (2) Stop executing (cannot be caught or ignored)
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* SIGTERM T Termination signal
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* SIGTSTP S (2) Terminal stop signal
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* SIGTTIN S Background process attempting read
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* SIGTTOU S Background process attempting write
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* SIGUSR1 T (4) User-defined signal 1
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* SIGUSR2 T (5) User-defined signal 2
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* SIGPOLL T (6) Poll-able event (XSI extension)
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* SIGPROF T Profiling timer expired (XSI extension)
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* SIGSYS A Bad system call (XSI extension)
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* SIGTRAP A Trace/breakpoint trap (XSI extension)
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* SIGURG I High bandwidth data is available at a socket
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* SIGVTALRM T Virtual timer expired (XSI extension)
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* SIGXCPU A CPU time limit exceeded (XSI extension)
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* SIGXFSZ A File size limit exceeded (XSI extension)
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* ---------- ------- ----------------------------------------------------
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*
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* Where default action codes are:
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*
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* T Abnormal termination of the process. The process is terminated with
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* all the consequences of _exit() except that the status made available
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* to wait() and waitpid() indicates abnormal termination by the
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* specified signal.
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* A Abnormal termination of the process. Additionally with the XSI
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* extension, implementation-defined abnormal termination actions, such
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* as creation of a core file, may occur.
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* I Ignore the signal.
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* S Stop the process.
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* C Continue the process, if it is stopped; otherwise, ignore the signal.
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*
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* NOTES:
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* (1) The default action can be enabled with CONFIG_SIG_SIGALRM_ACTION
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* (2) The default action can be enabled with CONFIG_SIG_SIGSTOP_ACTION
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* (3) The default action can be enabled with CONFIG_SIG_SIGKILL_ACTION
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* (4) The default action can be enabled with CONFIG_SIG_SIGUSR1_ACTION
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* (5) The default action can be enabled with CONFIG_SIG_SIGUSR2_ACTION
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* (6) The default action can be enabled with CONFIG_SIG_SIGPOLL_ACTION
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* (7) The default action can be enabled with CONFIG_SIG_SIGPIPE_ACTION
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*/
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/* A few of the real time signals are used within the OS. They have
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* default values that can be overridden from the configuration file. The
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* rest are all standard or user real-time signals.
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*
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* The signal number zero is wasted for the most part. It is a valid
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* signal number, but has special meaning at many interfaces (e.g., Kill()).
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*
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* These are the semi-standard signal definitions:
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*/
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#define SIGHUP 1
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#define SIGINT 2
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#define SIGQUIT 3
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#define SIGILL 4
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#define SIGTRAP 5
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#define SIGABRT 6
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#define SIGBUS 7
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#define SIGFPE 8
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#define SIGKILL 9
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#define SIGUSR1 10 /* User signal 1 */
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#define SIGSEGV 11
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#define SIGUSR2 12 /* User signal 2 */
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#define SIGPIPE 13
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#define SIGALRM 14 /* Default signal used with POSIX timers (used only */
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/* no other signal is provided) */
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#define SIGTERM 15
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#define SIGCHLD 17
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#define SIGCONT 18
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#define SIGSTOP 19
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#define SIGTSTP 20
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#define SIGTTIN 21
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#define SIGTTOU 22
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#define SIGURG 23
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#define SIGXCPU 24
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#define SIGXFSZ 25
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#define SIGVTALRM 26
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#define SIGPROF 27
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#define SIGPOLL 29
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#define SIGIO SIGPOLL
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#define SIGSYS 31
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/* sigprocmask() "how" definitions.
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* Only one of the following can be specified:
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*/
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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 << 0) /* Do not generate SIGCHLD when
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* children stop (ignored) */
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#define SA_SIGINFO (1 << 1) /* 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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#define SA_NOCLDWAIT (1 << 2) /* If signo=SIGCHLD, exit status of child
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* processes will be discarded */
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#define SA_ONSTACK (1 << 3) /* Indicates that a registered stack_t
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* will be used */
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#define SA_RESTART (1 << 4) /* Flag to get restarting signals
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* (which were the default long ago) */
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#define SA_NODEFER (1 << 5) /* Prevents the current signal from
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* being masked in the handler */
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#define SA_RESETHAND (1 << 6) /* Clears the handler when the signal
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* is delivered */
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#define SA_KERNELHAND (1 << 7) /* Invoke the handler in kernel space directly */
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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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#define CLD_EXITED 5 /* Child has exited (SIGCHLD only) */
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#define CLD_KILLED 6 /* Child was killed (SIGCHLD only) */
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#define CLD_DUMPED 7 /* Child terminated abnormally (SIGCHLD only) */
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#define CLD_TRAPPED 8 /* Traced child has trapped (SIGCHLD only) */
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#define CLD_STOPPED 9 /* Child has stopped (SIGCHLD only) */
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#define CLD_CONTINUED 10 /* Stopped child had continued (SIGCHLD only) */
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/* Values for the sigev_notify field of struct sigevent */
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#define SIGEV_NONE 0 /* No asynchronous notification is delivered */
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#define SIGEV_SIGNAL 1 /* Notify via signal,with an application-defined value */
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#ifdef CONFIG_SIG_EVTHREAD
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# define SIGEV_THREAD 3 /* A notification function is called */
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#endif
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/* Special values of sa_handler used by sigaction and sigset. They are all
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* treated like NULL for now. This is okay for SIG_DFL and SIG_IGN because
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* in NuttX, the default action for all signals is to ignore them.
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*/
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#define SIG_ERR ((_sa_handler_t)-1) /* And error occurred */
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#define SIG_IGN ((_sa_handler_t)0) /* Ignore the signal */
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#ifdef CONFIG_SIG_DEFAULT
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# define SIG_DFL ((_sa_handler_t)1) /* Default signal action */
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# define SIG_HOLD ((_sa_handler_t)2) /* Used only with sigset() */
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#else
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# define SIG_DFL ((_sa_handler_t)0) /* Default is SIG_IGN for all signals */
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# define SIG_HOLD ((_sa_handler_t)1) /* Used only with sigset() */
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#endif
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#define tkill(tid, signo) tgkill((pid_t)-1, tid, signo)
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/* This defines a set of 32 signals (numbered 0 through 31).
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* REVISIT: Signal 0 is, however, not generally usable since that value has
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* special meaning in some circumstances (e.g., kill()).
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*/
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struct sigset_s
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{
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uint32_t _elem[_SIGSET_NELEM];
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};
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typedef struct sigset_s sigset_t; /* Bit set of _NSIG signals */
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/* Possibly volatile-qualified integer type of an object that can be accessed
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* as an atomic entity, even in the presence of asynchronous interrupts.
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*/
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typedef volatile int sig_atomic_t;
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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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FAR void *sival_ptr; /* Pointer value */
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};
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/* This structure contains elements that define a queue signal.
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* The following is used to attach a signal to a message queue
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* to notify a task when a message is available on a queue.
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*/
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typedef CODE void (*sigev_notify_function_t)(union sigval value);
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struct sigevent
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{
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uint8_t sigev_notify; /* Notification method: SIGEV_SIGNAL, SIGEV_NONE, or SIGEV_THREAD */
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uint8_t sigev_signo; /* Notification signal */
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union sigval sigev_value; /* Data passed with notification */
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#ifdef CONFIG_SIG_EVTHREAD
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sigev_notify_function_t sigev_notify_function; /* Notification function */
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FAR struct pthread_attr_s *sigev_notify_attributes; /* Notification attributes (not used) */
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#endif
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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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uint8_t si_signo; /* Identifies signal */
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uint8_t si_code; /* Source: SI_USER, SI_QUEUE, SI_TIMER, SI_ASYNCIO, or SI_MESGQ */
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uint8_t si_errno; /* Zero or errno value associated with signal */
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union sigval si_value; /* Data passed with signal */
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#ifdef CONFIG_SCHED_HAVE_PARENT
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pid_t si_pid; /* Sending task ID */
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int si_status; /* Exit value or signal (SIGCHLD only). */
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#endif
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#if 0 /* Not implemented */
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FAR void *si_addr; /* Report address with SIGFPE, SIGSEGV, or SIGBUS */
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#endif
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FAR void *si_user; /* The User info associated with sigaction */
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};
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typedef struct siginfo siginfo_t;
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/* Non-standard convenience definition of signal handling function types.
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* These should be used only internally within the NuttX signal logic.
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*/
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typedef CODE void (*_sa_handler_t)(int signo);
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typedef CODE void (*_sa_sigaction_t)(int signo, FAR siginfo_t *siginfo,
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FAR void *context);
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/* glibc definition of signal handling function types */
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typedef _sa_handler_t sighandler_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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_sa_handler_t _sa_handler;
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_sa_sigaction_t _sa_sigaction;
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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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FAR void *sa_user;
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};
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/* Definitions that adjust the non-standard naming */
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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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* Public 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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{
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#else
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#define EXTERN extern
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#endif
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int kill(pid_t pid, int signo);
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int tgkill(pid_t pid, pid_t tid, int signo);
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void psignal(int signum, FAR const char *message);
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void psiginfo(FAR const siginfo_t *pinfo, FAR const char *message);
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int raise(int signo);
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int sigaction(int signo, FAR const struct sigaction *act,
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FAR struct sigaction *oact);
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int sigaddset(FAR sigset_t *set, int signo);
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int sigandset(FAR sigset_t *dest, FAR sigset_t *left, FAR sigset_t *right);
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int sigdelset(FAR sigset_t *set, int signo);
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int sigemptyset(FAR sigset_t *set);
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int sigfillset(FAR sigset_t *set);
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int sighold(int signo);
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int sigisemptyset(FAR sigset_t *set);
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int sigismember(FAR const sigset_t *set, int signo);
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int sigignore(int signo);
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_sa_handler_t signal(int signo, _sa_handler_t func);
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int sigorset(FAR sigset_t *dest, FAR sigset_t *left, FAR sigset_t *right);
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int sigpause(int signo);
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int sigpending(FAR sigset_t *set);
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int sigprocmask(int how, FAR const sigset_t *set, FAR sigset_t *oset);
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int sigqueue(int pid, int signo, union sigval value);
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int sigrelse(int signo);
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_sa_handler_t sigset(int signo, _sa_handler_t func);
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int sigwait(FAR const sigset_t *set, FAR int *sig);
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int sigtimedwait(FAR const sigset_t *set, FAR struct siginfo *value,
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FAR const struct timespec *timeout);
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int sigsuspend(FAR const sigset_t *sigmask);
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int sigwaitinfo(FAR const sigset_t *set, FAR struct siginfo *value);
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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 /* __INCLUDE_SIGNAL_H */
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