Copyright (C) 1994, Digital Equipment Corp. INTERFACE** <signal.h> **Usignal ; FROM Ctypes IMPORT int; FROM Utypes IMPORT u_long;
CONST SIGHUP = 1; (* hangup *) SIGINT = 2; (* interrupt *) SIGQUIT = 3; (* quit *) SIGILL = 4; (* illegal instruction (not reset when caught) *) SIGTRAP = 5; (* trace trap (not reset when caught) *) SIGIOT = 6; (* IOT instruction *) SIGABRT = 6; (* IOT instruction *) SIGEMT = 7; (* EMT instruction *) SIGFPE = 8; (* floating point exception *) 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 *) SIGUSR1 = 16; (* user defined signal 1 *) SIGUSR2 = 17; (* user defined signal 2 *) SIGCLD = 18; (* child status change *) SIGCHLD = 18; (* child status change *) SIGPWR = 19; (* power-fail restart *) SIGWINCH = 20; (* window size change *) SIGURG = 21; (* urgent socket condition *) SIGPOLL = 22; (* pollable event occured *) SIGIO = 22; (* input/output possible signal *) SIGSTOP = 23; (* stop (cannot be caught or ignored) *) SIGTSTP = 24; (* user stop requested from tty *) SIGCONT = 25; (* stopped process has been continued *) SIGTTIN = 26; (* background tty read attempted *) SIGTTOU = 27; (* background tty write attempted *) SIGVTALRM = 28; (* virtual timer expired *) SIGPROF = 29; (* profiling timer expired *) SIGXCPU = 30; (* exceeded cpu limit *) SIGXFSZ = 31; (* exceeded file size limit *) SIGWAITING = 32; (* process's lwps are blocked *) SIGLWP = 33; (* special signal used by thread library *) (* signals 37-59 reserved *) (* System V definitions *) 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 *) FPE_INTDIV_TRAP = 1; (* integer divide by zero *) FPE_INTOVF_TRAP = 2; (* integer overflow *) FPE_FLTDIV_TRAP = 3; (* floating/decimal divide by zero *) FPE_FLTOVF_TRAP = 4; (* floating overflow *) FPE_FLTUND_TRAP = 5; (* floating underflow *) FPE_DECOVF_TRAP = 6; (* decimal overflow *) FPE_SUBRNG_TRAP = 8; (* 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 *)Signal vector
template
used in sigvec call.
TYPE (* The ANSI C standard specifies that a signal handler should return an integer. AIX386 and IBMR2 follow the standard. For IBRT and other systems, there is no return value. Left the declaration of SignalHandler alone to avoid problems elsewhere. *) SignalHandler = PROCEDURE (sig, code: int; scp: UNTRACED REF struct_sigcontext); struct_sigset = RECORD sigbits : ARRAY [1..4] OF u_long; END; sigset_t = struct_sigset; struct_sigvec = RECORD sv_handler : SignalHandler; (* signal handler *) sv_mask : int; (* signal mask to apply *) sv_flags : int; (* see signal options below *) END; CONST (* empty_sigset_t = sigset_t { 0}; *) empty_sv_mask : int = 0; CONST SV_ONSTACK = 16_0001; (* take signal on signal stack *) SV_INTERRUPT = 16_0008; (* do not restart system on signal return *) SA_RESTART = 16_0008; SA_NOCLDSTOP = 16_0004; (* Don't generate SIGCLD when children stop *) SV_OLDSIG = 16_1000; (* Emulate old signal() for POSIX *) (* Defines for 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. * * XXX - sigcontext needs updating per 4.3BSD - rr *
TYPE struct_label_t_star = UNTRACED REF struct_label_t; struct_label_t = RECORD (* kernel jump buffer *) prev : struct_label_t_star; (* chain to previous *) iar : u_long; (* resume address *) stack : u_long; (* stack pointer *) toc : u_long; (* toc pointer *) cr : u_long; (* non-volatile part of cr *) intpri : u_long; (* priority level of the process *) reg : ARRAY [1..19] OF u_long; (* non-volative regs (13..31) *) END; struct_adspace_t = RECORD (* address space mapping *) alloc : u_long; (* allocation flags *) srval : ARRAY [0..15] OF u_long; (* contents of all seg regs *) END; struct_mstsave_star = UNTRACED REF struct_mstsave; struct_mstsave = RECORD prev : struct_mstsave_star; (* previous save area *) kjmpbuf : struct_label_t_star; (* pointer to fixed context *) stackfix : ADDRESS; (* stack fix *) intpri : CHAR; (* interrupt priority *) backt : CHAR; (* back-track flag *) rsvd : ARRAY [0..1] OF CHAR; (* reserved *) curid : int; (* copy of curid *) excp_type: int; (* exception type for debugger *) iar : u_long; (* instruction address register *) msr : u_long; (* machine state register *) cr : u_long; (* condition register *) lr : u_long; (* link register *) ctr : u_long; (* count register *) xer : u_long; (* fixed pointer register *) mq : u_long; (* multiply/quotient register *) tid : u_long; (* tid register *) fpscr : u_long; (* floating point status reg *) fpeu : CHAR; (* floating point ever used *) fpinfo : CHAR; (* floating point status flags *) pad : ARRAY [0..1] OF CHAR; (* res - pad to dword boundary *) (* This padding may not satisfy padding requirements because of translation by Modula-3 - CEG *) except : ARRAY [0..4] OF u_long; (* exception structure *) bus : ADDRESS; (* I/O bus limit register, CSR *) o_iar : u_long; (* old iar (for longjmp excpt) *) o_toc : u_long; (* old toc (for longjmp excpt) *) o_arg1 : u_long; (* old arg1 (for longjmp excpt) *) excbranch: u_long; (* if not NULL, address to branch to on exception. *) (* Used by assembler routines for low cost *) (* exception handling *) fpscrx : u_long; (* software extension to fpscr *) cachealign: ARRAY [0..7] OF u_long; (* cache-align registers *) as : struct_adspace_t; (* segment registers *) gpr : ARRAY [0..31] OF u_long; (* general purpose registers *) fpr : ARRAY [0..31] OF LONGREAL; (* floating point registers *) END; struct_jmpbuf = RECORD jmp_context: struct_mstsave; END; struct_sigcontext = RECORD sc_onstack : int; (* sigstack state to restore *) sc_mask : sigset_t; (* signal mask to restore *) END; struct_sigaction = RECORD sa_flags : int; (* signal action flags *) sa_handler : SignalHandler; (* signal handler *) sa_mask : sigset_t; (* signals to block while in handler *) sa_resv : ARRAY [0..1] OF int END; (* valid flags define for sa_flag field of sigaction structure *) CONST SA_ONSTACK = 16_0001; (* run on special signal stack *) SA_OLDSTYLE = 16_0002; (* old "unreliable" UNIX semantics *)
SA_RESTART = 16_0008;
(* restart system calls on sigs *) SA_NODUMP = 16_0010; (* termination by this sig does not use a core file *) SA_PARTDUMP = 16_0020; (* create a partial dump for this signal *) SA_FULLDUMP = 16_0040; (* create a full dump (with data areas) *) SA_SIGSETSTYLE = 16_0080; (* new system V sigset type semantics *)Do not modifiy these variables
VAR (* READONLY *) 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; <*EXTERNAL*> PROCEDURE sigaction (sig: int; VAR act, oact: struct_sigaction): int; <*EXTERNAL*> PROCEDURE sigprocmask (how: int; VAR set, oset: sigset_t): int; END Usignal.