Copyright (C) 1994, Digital Equipment Corp. INTERFACE** <signal.h> **Usignal ; FROM Ctypes IMPORT int, long, unsigned_long; IMPORT Utypes;
CONST SIGHUP = 1; (* hangup *) SIGINT = 2; (* interrupt *) SIGQUIT = 3; (* quit *) SIGILL = 4; (* illegal instruction (not reset when caught) *) ILL_RESAD_FAULT = 0; (* reserved addressing fault *) ILL_PRIVIN_FAULT = 1; (* privileged instruction fault *) ILL_RESOP_FAULT = 2; (* reserved operand fault *) (* CHME, CHMS, CHMU are not yet given back to users reasonably *) SIGTRAP = 5; (* trace trap (not reset when caught) *) SIGIOT = 6; (* IOT instruction *) SIGEMT = 7; (* EMT instruction *) SIGFPE = 8; (* floating point exception *) FPE_INTOVF_TRAP = 1; (* integer overflow *) FPE_INTDIV_TRAP = 2; (* integer divide by zero *) FPE_FLTOVF_TRAP = 3; (* floating overflow *) FPE_FLTDIV_TRAP = 4; (* floating/decimal divide by zero *) FPE_FLTUND_TRAP = 5; (* floating underflow *) FPE_DECOVF_TRAP = 6; (* decimal overflow *) FPE_SUBRNG_TRAP = 7; (* subscript out of range *) FPE_FLTOVF_FAULT = 8; (* floating overflow fault *) FPE_FLTDIV_FAULT = 9; (* divide by zero floating fault *) FPE_FLTUND_FAULT = 10; (* floating underflow fault *) SIGKILL = 9; (* kill (cannot be caught or ignored) *) SIGBUS = 10; (* bus error *) SIGSEGV = 11; (* segmentation violation *) SIGSYS = 12; (* bad argument to system call *) SIGPIPE = 13; (* write on a pipe with no one to read it *) SIGALRM = 14; (* alarm clock *) SIGTERM = 15; (* software termination signal from kill *) SIGURG = 16; (* urgent condition on IO channel *) SIGSTOP = 17; (* sendable stop signal not from tty *) SIGTSTP = 18; (* stop signal from tty *) SIGCONT = 19; (* continue a stopped process *) SIGCHLD = 20; (* to parent on child stop or exit *) SIGTTIN = 21; (* to readers pgrp upon background tty read *) SIGTTOU = 22; (* like TTIN for output if (tp->t_local<OSTOP) *) SIGIO = 23; (* input/output possible signal *) SIGXCPU = 24; (* exceeded CPU time limit *) SIGXFSZ = 25; (* exceeded file size limit *) SIGVTALRM = 26; (* virtual time alarm *) SIGPROF = 27; (* profiling time alarm *) SIGWINCH = 28; (* window size changes *) SIGINFO = 29; (* information request *) SIGUSR1 = 30; (* User signal 1 (from SysV) *) SIGUSR2 = 31; (* User signal 2 (from SysV) *) (* System V definitions *) SIGCLD = SIGCHLD; SIGABRT = SIGIOT;Signal vector
template
used in sigvec call.
TYPE SignalHandler = PROCEDURE (sig, code: int; scp: UNTRACED REF struct_sigcontext); sigset_t = int; struct_sigvec = RECORD sv_handler: SignalHandler; (* signal handler *) sv_mask: sigset_t; (* signal mask to apply *) sv_flags: int; (* see signal options below *) END; CONST empty_sigset_t : sigset_t = 0; empty_sv_mask : sigset_t = 0; CONST SV_ONSTACK = 16_0001; (* take signal on signal stack *) SV_INTERRUPT = 16_0002; (* do not restart system on signal return *) SA_NOCLDSTOP = 16_0004; (* Don't generate SIGCLD when children stop *) SV_OLDSIG = 16_1000; (* Emulate old signal() for POSIX *) (* Defines for "how" argument of sigprocmask() call. POSIX. *) SIG_BLOCK = 1; (* Add these signals to block mask *) SIG_UNBLOCK = 2; (* Remove these signals from block mask *) SIG_SETMASK = 3; (* Set block mask to this mask *) TYPE struct_sigstack = RECORD ss_sp: ADDRESS; (* signal stack pointer *) ss_onstack: int; (* current status *) END;
* Information pushed on stack when a signal is delivered. * This is used by the kernel to restore state following * execution of the signal handler. It is also made available * to the handler to allow it to properly restore state if * a non-standard exit is performed. * * WARNING: THE sigcontext MUST BE KEPT CONSISTENT WITH /usr/include/setjmp.h * AND THE LIBC ROUTINES setjmp() AND longjmp() *
TYPE longV = ARRAY [0..31] OF long; (* room for 32 registers *) TYPE struct_sigcontext = RECORD (*----------------------------------------------------------------------- * BEGIN REGION THAT MUST AGREE WITH jmp_buf REGION IN setjmp.h *) sc_onstack : long; (* sigstack state to restore *) sc_mask : long; (* signal mask to restore *) sc_pc : long; (* pc at time of signal *) sc_ps : long; (* psl to restore *) (* * General purpose registers *) sc_regs : longV; (* processor regs 0 to 31 *) sc_ownedfp : long; (* fp has been used *) sc_fpregs : longV; (* fp regs 0 to 31 *) sc_fpcr : unsigned_long; (* floating point control register *) sc_fp_control : unsigned_long; (* software fpcr *) (* END OF REGION THAT MUST AGREE WITH jmp_buf REGION IN setjmp.h -----------------------------------------------------------------------*) sc_reserved1 : long; (* reserved for user *) sc_reserved2 : long; (* reserved for user *) sc_reserved3 : long; (* reserved for user *) sc_reserved4 : long; (* reserved for user *) sc_traparg_a0 : unsigned_long; (* a0 argument to trap on exception *) sc_traparg_a1 : unsigned_long; (* a1 argument to trap on exception *) sc_traparg_a2 : unsigned_long; (* a2 argument to trap on exception *) sc_fp_trap_pc : unsigned_long; (* imprecise pc *) sc_fp_trigger_sum : unsigned_long; (* exception summary at trigger pc *) sc_fp_trigger_inst : unsigned_long; (* instruction at trigger pc *) (*----------------------------------------------------------------------- * START OF 2nd REGION THAT MUST AGREE WITH jmp_buf REGION IN setjmp.h *) sc_ssize : Utypes.size_t; (* stack size *) sc_sbase : Utypes.caddr_t; (* stack start *) (* END OF 2nd REGION THAT MUST AGREE WITH jmp_buf REGION IN setjmp.h --------------------------------------------------------------------*) END; CONST R_SP = 30; (* index of stack pointer in sc_regs above *)Do not modifiy these variables
VAR (* CONST *) BADSIG, SIG_ERR, SIG_DFL, SIG_IGN: SignalHandler;Convert a signal number to a mask suitable for sigblock().
<*INLINE*> PROCEDURE sigmask (n: int): int;** kill(2) - send signal to a process **
<*EXTERNAL*> PROCEDURE kill (pid, sig: int): int;** killpg(2) - send signal to a process or process group **
<*EXTERNAL*> PROCEDURE killpg (pgrp, sig: int): int;** sigblock(2) - block signals **
<*EXTERNAL*> PROCEDURE sigblock (mask: int): int;** sigpause(2) - atomically release blocked signals and wait for interrupt **
<*EXTERNAL*> PROCEDURE sigpause (sigmask: int): int;** sigpending(2) - examine pending signals **
<*EXTERNAL*> PROCEDURE sigpending (VAR set: sigset_t): int;** sigsetmask(2) - set current signal mask **
<*EXTERNAL*> PROCEDURE sigsetmask (mask: int): int;** sigstack(2) - set and/or get signal stack context **
<*EXTERNAL*> PROCEDURE sigstack (VAR ss, oss: struct_sigstack): int;** sigvec(2) - software signal facilities **
<*EXTERNAL*> PROCEDURE sigvec (sig: int; VAR vec, ovec: struct_sigvec): int; END Usignal.