266 lines
7.4 KiB
Groff
266 lines
7.4 KiB
Groff
.\" $NetBSD: signal.7,v 1.7 2004/07/01 10:38:28 kleink Exp $
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.\"
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.\" Copyright (c) 1999 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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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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.\" 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 the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the NetBSD
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.\" Foundation, Inc. and its contributors.
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.\" 4. Neither the name of The NetBSD Foundation nor the names of its
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.\" contributors may be used to endorse or promote products derived
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.\" from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN 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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.Dd June 13, 2004
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.Dt SIGNAL 7
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.Os
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.Sh NAME
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.Nm signal
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.Nd signal facilities
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.Sh DESCRIPTION
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The
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.Aq Pa signal.h
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header file defines the following signals:
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.Pp
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.Bl -column "SIGVTALARM" "terminate process" -compact
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.It Em "Name" Ta Em "Default Action" Ta Em "Description"
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.It Li SIGHUP Ta "terminate process" Ta "terminal line hangup"
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.It Li SIGINT Ta "terminate process" Ta "interrupt program"
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.It Li SIGQUIT Ta "create core image" Ta "quit program"
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.It Li SIGILL Ta "create core image" Ta "illegal instruction"
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.It Li SIGTRAP Ta "create core image" Ta "trace trap"
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.It Li SIGABRT Ta "create core image" Ta Xr abort 3
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call (formerly
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.Dv SIGIOT )
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.It Li SIGEMT Ta "create core image" Ta "emulate instruction executed"
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.It Li SIGFPE Ta "create core image" Ta "floating-point exception"
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.It Li SIGKILL Ta "terminate process" Ta "kill program (cannot be caught or ignored)"
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.It Li SIGBUS Ta "create core image" Ta "bus error"
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.It Li SIGSEGV Ta "create core image" Ta "segmentation violation"
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.It Li SIGSYS Ta "create core image" Ta "invalid system call argument"
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.It Li SIGPIPE Ta "terminate process" Ta "write to a pipe with no reader"
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.It Li SIGALRM Ta "terminate process" Ta "real-time timer expired"
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.It Li SIGTERM Ta "terminate process" Ta "software termination signal"
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.It Li SIGURG Ta "discard signal" Ta "urgent condition present on socket"
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.It Li SIGSTOP Ta "stop process" Ta "stop (cannot be caught or ignored)"
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.It Li SIGTSTP Ta "stop process" Ta "stop signal generated from keyboard"
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.It Li SIGCONT Ta "discard signal" Ta "continue after stop"
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.It Li SIGCHLD Ta "discard signal" Ta "child status has changed"
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.It Li SIGTTIN Ta "stop process" Ta "background read attempted from control terminal"
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.It Li SIGTTOU Ta "stop process" Ta "background write attempted to control terminal"
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.It Li SIGIO Ta "discard signal" Ta "I/O is possible on a descriptor (see"
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.Xr fcntl 2 )
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.It Li SIGXCPU Ta "terminate process" Ta "CPU time limit exceeded (see"
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.Xr setrlimit 2 )
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.It Li SIGXFSZ Ta "terminate process" Ta "file size limit exceeded (see"
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.Xr setrlimit 2 )
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.It Li SIGVTALRM Ta "terminate process" Ta "virtual time alarm (see"
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.Xr setitimer 2 )
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.It Li SIGPROF Ta "terminate process" Ta "profiling timer alarm (see"
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.Xr setitimer 2 )
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.It Li SIGWINCH Ta "discard signal" Ta "window size change"
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.It Li SIGINFO Ta "discard signal" Ta "status request from keyboard"
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.It Li SIGUSR1 Ta "terminate process" Ta "user-defined signal 1"
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.It Li SIGUSR2 Ta "terminate process" Ta "user-defined signal 2"
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.It Li SIGPWR Ta "discard signal" Ta "power failure/restart"
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.El
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.Pp
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A function that is async-signal-safe is either reentrant or
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non-interruptible by signals, this means that they can be used in
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signal handlers
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and in the child of threaded programs after doing
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.Xr fork 2 .
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.Pp
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The following functions are async-signal-safe, any function not listed
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below is unsafe to use in signal handlers.
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.Pp
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.Xr _Exit 2 ,
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.Xr _exit 2 ,
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.Xr abort 3 ,
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.Xr accept 2 ,
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.Xr access 2 ,
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.\" .Xr aio_error
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.\" .Xr aio_return
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.\" .Xr aio_suspend
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.Xr alarm 3 ,
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.Xr bind 2 ,
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.Xr cfgetispeed 3 ,
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.Xr cfgetospeed 3 ,
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.Xr cfsetispeed 3 ,
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.Xr cfsetospeed 3 ,
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.Xr chdir 2 ,
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.Xr chmod 2 ,
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.Xr chown 2 ,
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.Xr clock_gettime 2 ,
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.Xr close 2 ,
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.Xr connect 2 ,
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.Xr creat 3 ,
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.Xr dup 2 ,
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.Xr dup2 2 ,
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.Xr execle 3 ,
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.Xr execve 3 ,
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.Xr fchmod 2 ,
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.Xr fchown 2 ,
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.Xr fcntl 2 ,
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.Xr fdatasync 2 ,
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.Xr fork 2 ,
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.Xr fpathconf 2 ,
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.Xr fstat 2 ,
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.Xr fsync 2 ,
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.Xr ftruncate 2 ,
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.Xr getegid 2 ,
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.Xr geteuid 2 ,
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.Xr getgid 2 ,
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.Xr getgroups 2 ,
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.Xr getpeername 2 ,
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.Xr getpgrp 2 ,
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.Xr getpid 2 ,
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.Xr getppid 2 ,
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.Xr getsockname 2 ,
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.Xr getsockopt 2 ,
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.Xr getuid 2 ,
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.Xr kill 2 ,
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.Xr link 2 ,
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.Xr listen 2 ,
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.Xr lseek 2 ,
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.Xr lstat 2 ,
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.Xr mkdir 2 ,
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.Xr mkfifo 2 ,
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.Xr open 2 ,
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.Xr pathconf 2 ,
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.Xr pause 3 ,
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.Xr pipe 2 ,
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.Xr poll 2 ,
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.\" .Xr posix_trace_event 2
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.\" .Xr pselect 2
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.Xr raise 3 ,
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.Xr read 2 ,
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.Xr readlink 2 ,
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.Xr recv 2 ,
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.Xr recvfrom 2 ,
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.Xr recvmsg 2 ,
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.Xr rename 2 ,
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.Xr rmdir 2,
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.Xr select 2 ,
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.Xr sem_post 3 ,
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.Xr send 2 ,
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.Xr sendmsg 2 ,
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.Xr sendto 2 ,
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.Xr setgid 2 ,
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.Xr setpgid 2 ,
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.Xr setsid 2 ,
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.Xr setsockopt 2 ,
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.Xr setuid 2 ,
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.Xr shutdown 2 ,
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.Xr sigaction 2 ,
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.Xr sigaddset 3 ,
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.Xr sigdelset 3 ,
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.Xr sigemptyset 3 ,
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.Xr sigfillset 3 ,
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.Xr sigismember 3 ,
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.Xr sleep 3 ,
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.Xr signal 3 ,
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.Xr sigpause 3 ,
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.Xr sigpending 2 ,
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.Xr sigprocmask 2 ,
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.\" .Xr sigqueue
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.Xr sigset 3 ,
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.Xr sigsuspend 2 ,
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.Xr sockatmark 3 ,
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.Xr socket 2 ,
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.Xr socketpair 2 ,
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.Xr stat 2 ,
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.Xr symlink 2 ,
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.Xr sysconf 3 ,
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.Xr tcdrain 3 ,
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.Xr tcflow 3 ,
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.Xr tcflush 3 ,
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.Xr tcgetattr 3 ,
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.Xr tcgetpgrp 3 ,
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.Xr tcsendbreak 3 ,
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.Xr tcsetattr 3 ,
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.Xr tcsetpgrp 3 ,
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.Xr time 3 ,
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.Xr timer_getoverrun 2 ,
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.Xr timer_gettime 2 ,
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.Xr timer_settime 2 ,
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.Xr times 3 ,
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.Xr umask 2 ,
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.Xr uname 3 ,
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.Xr unlink 2 ,
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.Xr utime 3 ,
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.Xr wait 2 ,
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.Xr waitpid 2 ,
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.Xr write 2 .
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.Sh STANDARDS
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These signals conform to
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.St -p1003.1-90 ,
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with the exception of
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.Dv SIGTRAP ,
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.Dv SIGEMT ,
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.Dv SIGBUS ,
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.Dv SIGSYS ,
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.Dv SIGURG ,
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.Dv SIGIO ,
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.Dv SIGXCPU ,
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.Dv SIGXFSZ ,
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.Dv SIGVTALRM ,
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.Dv SIGPROF ,
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.Dv SIGWINCH ,
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and
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.Dv SIGINFO
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which are Berkeley extensions (available on most
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.Bx Ns \-derived
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systems), and
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.Dv SIGPWR
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which comes from System V.
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.Sh HISTORY
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.Dv SIGPWR
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was introduced in
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.Nx 1.4 .
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.Sh NOTES
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The current
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.Nx
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kernel never generates the
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.Dv SIGPWR
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signal.
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.Sh SEE ALSO
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.Xr kill 1 ,
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.Xr kill 2 ,
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.Xr ptrace 2 ,
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.Xr sigaction 2 ,
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.Xr sigaltstack 2 ,
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.Xr sigprocmask 2 ,
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.Xr sigstack 2 ,
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.Xr sigsuspend 2 ,
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.Xr fpgetmask 3 ,
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.Xr fpsetmask 3 ,
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.Xr setjmp 3 ,
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.Xr sigblock 3 ,
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.Xr siginterrupt 3 ,
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.Xr signal 3 ,
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.Xr sigpause 3 ,
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.Xr sigsetmask 3 ,
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.Xr sigsetops 3 ,
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.Xr tty 4
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