signal(7) - NetBSD Manual Pages

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SIGNAL(7)           NetBSD Miscellaneous Information Manual          SIGNAL(7)


NAME

     signal -- signal facilities


DESCRIPTION

     The <signal.h> header file defines the following signals:

     Name          Default Action       Description
     SIGHUP        terminate process    terminal line hangup
     SIGINT        terminate process    interrupt program
     SIGQUIT       create core image    quit program
     SIGILL        create core image    illegal instruction
     SIGTRAP       create core image    trace trap
     SIGABRT       create core image    abort(3) call (formerly SIGIOT)
     SIGEMT        create core image    emulate instruction executed
     SIGFPE        create core image    floating-point exception
     SIGKILL       terminate process    kill program (cannot be caught or
                                        ignored)
     SIGBUS        create core image    bus error
     SIGSEGV       create core image    segmentation violation
     SIGSYS        create core image    invalid system call argument
     SIGPIPE       terminate process    write to a pipe with no reader
     SIGALRM       terminate process    real-time timer expired
     SIGTERM       terminate process    software termination signal
     SIGURG        discard signal       urgent condition present on socket
     SIGSTOP       stop process         stop (cannot be caught or ignored)
     SIGTSTP       stop process         stop signal generated from keyboard
     SIGCONT       discard signal       continue after stop
     SIGCHLD       discard signal       child status has changed
     SIGTTIN       stop process         background read attempted from control
                                        terminal
     SIGTTOU       stop process         background write attempted to control
                                        terminal
     SIGIO         discard signal       I/O is possible on a descriptor (see
                                        fcntl(2))
     SIGXCPU       terminate process    CPU time limit exceeded (see
                                        setrlimit(2))
     SIGXFSZ       terminate process    file size limit exceeded (see
                                        setrlimit(2))
     SIGVTALRM     terminate process    virtual time alarm (see setitimer(2))
     SIGPROF       terminate process    profiling timer alarm (see
                                        setitimer(2))
     SIGWINCH      discard signal       window size change
     SIGINFO       discard signal       status request from keyboard
     SIGUSR1       terminate process    user-defined signal 1
     SIGUSR2       terminate process    user-defined signal 2
     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(3), 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).


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.


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)

NetBSD 3.0.2                     June 13, 2004                    NetBSD 3.0.2