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SIGNAL(7)              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-
     interruptible 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 IEEE Std 1003.1-1990 (``POSIX.1''), with the
     exception 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 System V.

HISTORY
     SIGPWR was introduced in NetBSD 1.4.

NOTES
     The current NetBSD kernel never generates the SIGPWR signal.

NetBSD 6.1.5                   February 27, 2009                  NetBSD 6.1.5