signal(7) - NetBSD Manual Pages

SIGNAL(7)           NetBSD 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),
     pthread_mutex_unlock(3), 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
     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 7.0                       July 18, 2014                      NetBSD 7.0