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.Dd September 27, 1999 .Dt SIGNAL 7 .Os .Sh NAME .Nm signal .Nd signal facilities .Sh DESCRIPTION The .Aq Pa signal.h header file defines the following signals:
p l -column "SIGVTALARM" "terminate process" -compact t Li Em "Name" Ta Em "Default Action" Ta Em "Description" t Li SIGHUP Ta "terminate process" Ta "terminal line hangup" t Li SIGINT Ta "terminate process" Ta "interrupt program" t Li SIGQUIT Ta "create core image" Ta "quit program" t Li SIGILL Ta "create core image" Ta "illegal instruction" t Li SIGTRAP Ta "create core image" Ta "trace trap" t Li SIGABRT Ta "create core image" Ta Xr abort 3 call (formerly .Dv SIGIOT ) t Li SIGEMT Ta "create core image" Ta "emulate instruction executed" t Li SIGFPE Ta "create core image" Ta "floating-point exception" t Li SIGKILL Ta "terminate process" Ta "kill program (cannot be caught or ignored)" t Li SIGBUS Ta "create core image" Ta "bus error" t Li SIGSEGV Ta "create core image" Ta "segmentation violation" t Li SIGSYS Ta "create core image" Ta "invalid system call argument" t Li SIGPIPE Ta "terminate process" Ta "write to a pipe with no reader" t Li SIGALRM Ta "terminate process" Ta "real-time timer expired" t Li SIGTERM Ta "terminate process" Ta "software termination signal" t Li SIGURG Ta "discard signal" Ta "urgent condition present on socket" t Li SIGSTOP Ta "stop process" Ta "stop (cannot be caught or ignored)" t Li SIGTSTP Ta "stop process" Ta "stop signal generated from keyboard" t Li SIGCONT Ta "discard signal" Ta "continue after stop" t Li SIGCHLD Ta "discard signal" Ta "child status has changed" t Li SIGTTIN Ta "stop process" Ta "background read attempted from control terminal" t Li SIGTTOU Ta "stop process" Ta "background write attempted to control terminal" t Li SIGIO Ta "discard signal" Ta "I/O is possible on a descriptor (see" .Xr fcntl 2 ) t Li SIGXCPU Ta "terminate process" Ta "CPU time limit exceeded (see" .Xr setrlimit 2 ) t Li SIGXFSZ Ta "terminate process" Ta "file size limit exceeded (see" .Xr setrlimit 2 ) t Li SIGVTALRM Ta "terminate process" Ta "virtual time alarm (see" .Xr setitimer 2 ) t Li SIGPROF Ta "terminate process" Ta "profiling timer alarm (see" .Xr setitimer 2 ) t Li SIGWINCH Ta "discard signal" Ta "window size change" t Li SIGINFO Ta "discard signal" Ta "status request from keyboard" t Li SIGUSR1 Ta "terminate process" Ta "user-defined signal 1" t Li SIGUSR2 Ta "terminate process" Ta "user-defined signal 2" t Li SIGPWR Ta "discard signal" Ta "power failure/restart" .El .Sh STANDARDS These signals conform to .St -p1003.1-90 , with the exception of .Dv SIGTRAP , .Dv SIGEMT , .Dv SIGBUS , .Dv SIGSYS , .Dv SIGURG , .Dv SIGIO , .Dv SIGXCPU , .Dv SIGXFSZ , .Dv SIGVTALRM , .Dv SIGPROF , .Dv SIGWINCH , and .Dv SIGINFO which are Berkeley extensions (available on most x Ns -derived systems), and .Dv SIGPWR which comes from System V. .Sh HISTORY .Dv SIGPWR was introduced in .Nx 1.4 . .Sh NOTES The current .Nx kernel never generates the .Dv SIGPWR signal. .Sh SEE ALSO .Xr kill 1 , .Xr kill 2 , .Xr ptrace 2 , .Xr sigaction 2 , .Xr sigaltstack 2 , .Xr sigprocmask 2 , .Xr sigstack 2 , .Xr sigsuspend 2 , .Xr setjmp 3 , .Xr sigblock 3 , .Xr siginterrupt 3 , .Xr signal 3 , .Xr sigpause 3 , .Xr sigsetmask 3 , .Xr sigsetops 3 , .Xr tty 4
Indexes created Fri Oct 03 02:09:57 GMT 2025