signal man page on NetBSD
[printable version]
SIGNAL(7) BSD Miscellaneous Information Manual SIGNAL(7)
NAME
signal — signal facilities
DESCRIPTION
The <signal.h> header file defines the following signals:
Value Name Default Action Description
1 SIGHUP terminate process terminal line hangup
2 SIGINT terminate process interrupt program
3 SIGQUIT create core image quit program
4 SIGILL create core image illegal instruction
5 SIGTRAP create core image trace trap
6 SIGABRT create core image abort(3) call (formerly
SIGIOT)
7 SIGEMT create core image emulate instruction executed
8 SIGFPE create core image floating-point exception
9 SIGKILL terminate process kill program (cannot be
caught or ignored)
10 SIGBUS create core image bus error
11 SIGSEGV create core image segmentation violation
12 SIGSYS create core image invalid system call argument
13 SIGPIPE terminate process write to a pipe with no
reader
14 SIGALRM terminate process real-time timer expired
15 SIGTERM terminate process software termination signal
16 SIGURG discard signal urgent condition present on
socket
17 SIGSTOP stop process stop (cannot be caught or
ignored)
18 SIGTSTP stop process stop signal generated from
keyboard
19 SIGCONT discard signal continue after stop (even if
blocked or ignored)
20 SIGCHLD discard signal child status has changed
21 SIGTTIN stop process background read attempted
from control terminal
22 SIGTTOU stop process background write attempted to
control terminal
23 SIGIO discard signal I/O is possible on a
descriptor (see fcntl(2))
24 SIGXCPU terminate process CPU time limit exceeded (see
setrlimit(2))
25 SIGXFSZ terminate process file size limit exceeded (see
setrlimit(2))
26 SIGVTALRM terminate process virtual time alarm (see
setitimer(2))
27 SIGPROF terminate process profiling timer alarm (see
setitimer(2))
28 SIGWINCH discard signal window size change
29 SIGINFO discard signal status request from keyboard
30 SIGUSR1 terminate process user-defined signal 1
31 SIGUSR2 terminate process user-defined signal 2
32 SIGPWR discard signal power failure/restart
A function that is async-signal-safe is either reentrant or non-inter‐
ruptible by signals. This means that they can be used in signal handlers
and in the child of threaded programs after doing fork(2).
The following functions are async-signal-safe. Any function not listed
below is unsafe to use in signal handlers.
_Exit(2), _exit(2), abort(3), accept(2), access(2), alarm(3), bind(2),
cfgetispeed(3), cfgetospeed(3), cfsetispeed(3), cfsetospeed(3), chdir(2),
chmod(2), chown(2), clock_gettime(2), close(2), connect(2), creat(3),
dup(2), dup2(2), execle(3), execve(2), fchmod(2), fchown(2), fcntl(2),
fdatasync(2), fork(2), fpathconf(2), fstat(2), fsync(2), ftruncate(2),
getegid(2), geteuid(2), getgid(2), getgroups(2), getpeername(2),
getpgrp(2), getpid(2), getppid(2), getsockname(2), getsockopt(2),
getuid(2), kill(2), link(2), listen(2), lseek(2), lstat(2), mkdir(2),
mkfifo(2), open(2), pathconf(2), pause(3), pipe(2), poll(2), raise(3),
read(2), readlink(2), recv(2), recvfrom(2), recvmsg(2), rename(2),
rmdir(2), select(2), sem_post(3), send(2), sendmsg(2), sendto(2),
setgid(2), setpgid(2), setsid(2), setsockopt(2), setuid(2), shutdown(2),
sigaction(2), sigaddset(3), sigdelset(3), sigemptyset(3), sigfillset(3),
sigismember(3), sleep(3), signal(3), sigpause(3), sigpending(2),
sigprocmask(2), sigset(3), sigsuspend(2), sockatmark(3), socket(2),
socketpair(2), stat(2), symlink(2), sysconf(3), tcdrain(3), tcflow(3),
tcflush(3), tcgetattr(3), tcgetpgrp(3), tcsendbreak(3), tcsetattr(3),
tcsetpgrp(3), time(3), timer_getoverrun(2), timer_gettime(2),
timer_settime(2), times(3), umask(2), uname(3), unlink(2), utime(3),
wait(2), waitpid(2), write(2).
SEE ALSO
kill(1), kill(2), ptrace(2), sigaction(2), sigaltstack(2),
sigprocmask(2), sigstack(2), sigsuspend(2), fpgetmask(3), fpsetmask(3),
setjmp(3), sigblock(3), siginterrupt(3), signal(3), sigpause(3),
sigsetmask(3), sigsetops(3), tty(4)
STANDARDS
These signals conform to ISO/IEC 9945-1:1990 (“POSIX.1”), with the excep‐
tion of SIGTRAP, SIGEMT, SIGBUS, SIGSYS, SIGURG, SIGIO, SIGXCPU, SIGXFSZ,
SIGVTALRM, SIGPROF, SIGWINCH, and SIGINFO which are Berkeley extensions
(available on most BSD-derived systems), and SIGPWR which comes from Sys‐
tem V.
HISTORY
SIGPWR was introduced in NetBSD 1.4.
NOTES
The current NetBSD kernel never generates the SIGPWR signal.
BSD February 27, 2009 BSD
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