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:

     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
     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).


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 5.1                      March 28, 2006                      NetBSD 5.1