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71fc7238ff607b0cdddb5f153ffa09b110f59c13
yap-6.3/os/sig.c
Vitor Santos Costa f39619b3ef doc fixes
2018-04-23 14:34:52 +01:00

865 lines
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#include "sysbits.h"
#if HAVE_SIGINFO_H
#include <siginfo.h>
#endif
#if HAVE_SYS_UCONTEXT_H
#include <sys/ucontext.h>
#endif
#if HAVE_FPU_CONTROL_H
#include <fpu_control.h>
#endif
#define SIG_PROLOG_OFFSET 32 /* Start of Prolog signals */
#define SIG_EXCEPTION (SIG_PROLOG_OFFSET + 0)
#ifdef O_ATOMGC
#define SIG_ATOM_GC (SIG_PROLOG_OFFSET + 1)
#endif
#define SIG_GC (SIG_PROLOG_OFFSET + 2)
#ifdef O_PLMT
#define SIG_THREAD_SIGNAL (SIG_PROLOG_OFFSET + 3)
#endif
#define SIG_FREECLAUSES (SIG_PROLOG_OFFSET + 4)
#define SIG_PLABORT (SIG_PROLOG_OFFSET + 5)
static struct signame {
int sig;
const char *name;
int flags;
} signames[] = {
#ifdef SIGHUP
{SIGHUP, "hup", 0},
#endif
{SIGINT, "int", 0},
#ifdef SIGQUIT
{SIGQUIT, "quit", 0},
#endif
{SIGILL, "ill", 0},
{SIGABRT, "abrt", 0},
{SIGFPE, "fpe", 0},
#ifdef SIGKILL
{SIGKILL, "kill", 0},
#endif
{SIGSEGV, "segv", 0},
#ifdef SIGPIPE
{SIGPIPE, "pipe", 0},
#endif
#ifdef SIGALRM
{SIGALRM, "alrm", 0},
#endif
{SIGTERM, "term", 0},
#ifdef SIGUSR1
{SIGUSR1, "usr1", 0},
#endif
#ifdef SIGUSR2
{SIGUSR2, "usr2", 0},
#endif
#ifdef SIGCHLD
{SIGCHLD, "chld", 0},
#endif
#ifdef SIGCONT
{SIGCONT, "cont", 0},
#endif
#ifdef SIGSTOP
{SIGSTOP, "stop", 0},
#endif
#ifdef SIGTSTP
{SIGTSTP, "tstp", 0},
#endif
#ifdef SIGTTIN
{SIGTTIN, "ttin", 0},
#endif
#ifdef SIGTTOU
{SIGTTOU, "ttou", 0},
#endif
#ifdef SIGTRAP
{SIGTRAP, "trap", 0},
#endif
#ifdef SIGBUS
{SIGBUS, "bus", 0},
#endif
#ifdef SIGSTKFLT
{SIGSTKFLT, "stkflt", 0},
#endif
#ifdef SIGURG
{SIGURG, "urg", 0},
#endif
#ifdef SIGIO
{SIGIO, "io", 0},
#endif
#ifdef SIGPOLL
{SIGPOLL, "poll", 0},
#endif
#ifdef SIGXCPU
{SIGXCPU, "xcpu", 0},
#endif
#ifdef SIGXFSZ
{SIGXFSZ, "xfsz", 0},
#endif
#ifdef SIGVTALRM
{SIGVTALRM, "vtalrm", 0},
#endif
#ifdef SIGPROF
{SIGPROF, "prof", 0},
#endif
#ifdef SIGPWR
{SIGPWR, "pwr", 0},
#endif
{SIG_EXCEPTION, "prolog:exception", 0},
#ifdef SIG_ATOM_GC
{SIG_ATOM_GC, "prolog:atom_gc", 0},
#endif
{SIG_GC, "prolog:gc", 0},
#ifdef SIG_THREAD_SIGNAL
{SIG_THREAD_SIGNAL, "prolog:thread_signal", 0},
#endif
{-1, NULL, 0}};
#if HAVE_SIGACTION
static void my_signal_info(int sig, void *handler) {
struct sigaction sigact;
sigact.sa_handler = handler;
sigemptyset(&sigact.sa_mask);
sigact.sa_flags = SA_SIGINFO;
sigaction(sig, &sigact, NULL);
}
static void my_signal(int sig, void *handler) {
struct sigaction sigact;
sigact.sa_handler = (void *)handler;
sigemptyset(&sigact.sa_mask);
sigact.sa_flags = 0;
sigaction(sig, &sigact, NULL);
}
#else
static void my_signal(int sig, void *handler) {
#if HAVE_SIGNAL
signal(sig, handler);
#endif
}
static void my_signal_info(int sig, void *handler) {
#if HAVE_SIGNAL
if (signal(sig, (void *)handler) == SIG_ERR)
exit(1);
#endif
}
#endif
static void HandleMatherr(int sig, void *sipv, void *uapv) {
CACHE_REGS
LOCAL_Error_TYPE = Yap_MathException();
/* reset the registers so that we don't have trash in abstract machine */
Yap_external_signal(worker_id, YAP_FPE_SIGNAL);
}
/* SWI emulation */
int Yap_signal_index(const char *name) {
struct signame *sn = signames;
char tmp[12];
if (strncmp(name, "SIG", 3) == 0 && strlen(name) < 12) {
char *p = (char *)name + 3, *q = tmp;
while ((*q++ = tolower(*p++))) {
};
name = tmp;
}
for (; sn->name; sn++) {
if (!strcmp(sn->name, name))
return sn->sig;
}
return -1;
}
#if HAVE_SIGSEGV
static void SearchForTrailFault(void *ptr, int sure) {
/* If the TRAIL is very close to the top of mmaped allocked space,
then we can try increasing the TR space and restarting the
instruction. In the worst case, the system will
crash again
*/
#if OS_HANDLES_TR_OVERFLOW && !USE_SYSTEM_MALLOC
if ((ptr > (void *)LOCAL_TrailTop - 1024 &&
TR < (tr_fr_ptr)LOCAL_TrailTop + (64 * 1024))) {
if (!Yap_growtrail(64 * 1024, TRUE)) {
Yap_Error(RESOURCE_ERROR_TRAIL, TermNil,
"YAP failed to reserve %ld bytes in growtrail", K64);
}
/* just in case, make sure the OS keeps the signal handler. */
/* my_signal_info(SIGSEGV, HandleSIGSEGV); */
} else
#endif /* OS_HANDLES_TR_OVERFLOW */
if (sure)
Yap_Error(SYSTEM_ERROR_FATAL, TermNil,
"tried to access illegal address %p!!!!", ptr);
else
Yap_Error(SYSTEM_ERROR_FATAL, TermNil,
"likely bug in YAP, segmentation violation");
}
/* This routine believes there is a continuous space starting from the
HeapBase and ending on TrailTop */
static void HandleSIGSEGV(int sig, void *sipv, void *uap) {
CACHE_REGS
void *ptr = TR;
int sure = FALSE;
if (LOCAL_PrologMode & ExtendStackMode) {
Yap_Error(SYSTEM_ERROR_FATAL, TermNil,
"OS memory allocation crashed at address %p, bailing out\n",
LOCAL_TrailTop);
}
#if (defined(__svr4__) || defined(__SVR4))
siginfo_t *sip = sipv;
if (sip->si_code != SI_NOINFO && sip->si_code == SEGV_MAPERR) {
ptr = sip->si_addr;
sure = TRUE;
}
#elif __linux__
siginfo_t *sip = sipv;
ptr = sip->si_addr;
sure = TRUE;
#endif
SearchForTrailFault(ptr, sure);
}
#endif /* SIGSEGV */
/* by default Linux with glibc is IEEE compliant anyway..., but we will pretend
* it is not. */
static bool set_fpu_exceptions(Term flag) {
if (flag == TermTrue) {
#if HAVE_FESETEXCEPTFLAG
fexcept_t excepts;
return fesetexceptflag(&excepts,
FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW) == 0;
#elif HAVE_FEENABLEEXCEPT
/* I shall ignore de-normalization and precision errors */
feenableexcept(FE_DIVBYZERO | FE_INVALID | FE_OVERFLOW);
#elif _WIN32
// Enable zero-divide, overflow and underflow exception
_controlfp_s(0, ~(_EM_ZERODIVIDE | _EM_UNDERFLOW | _EM_OVERFLOW),
_MCW_EM); // Line B
#elif defined(__hpux)
#if HAVE_FESETTRAPENABLE
/* From HP-UX 11.0 onwards: */
fesettrapenable(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW);
#else
/*
Up until HP-UX 10.20:
FP_X_INV invalid operation exceptions
FP_X_DZ divide-by-zero exception
FP_X_OFL overflow exception
FP_X_UFL underflow exception
FP_X_IMP imprecise (inexact result)
FP_X_CLEAR simply zero to clear all flags
*/
fpsetmask(FP_X_INV | FP_X_DZ | FP_X_OFL | FP_X_UFL);
#endif
#endif /* __hpux */
#if HAVE_FPU_CONTROL_H && i386 && defined(__GNUC__)
/* I shall ignore denormalization and precision errors */
int v = _FPU_IEEE &
~(_FPU_MASK_IM | _FPU_MASK_ZM | _FPU_MASK_OM | _FPU_MASK_UM);
_FPU_SETCW(v);
#endif
#if HAVE_FETESTEXCEPT
feclearexcept(FE_ALL_EXCEPT);
#endif
#ifdef HAVE_SIGFPE
my_signal(SIGFPE, HandleMatherr);
#endif
} else {
/* do IEEE arithmetic in the way the big boys do */
#if HAVE_FESETEXCEPTFLAG
fexcept_t excepts;
return fesetexceptflag(&excepts, 0) == 0;
#elif HAVE_FEENABLEEXCEPT
/* I shall ignore de-normalization and precision errors */
feenableexcept(0);
#elif _WIN32
// Enable zero-divide, overflow and underflow exception
_controlfp_s(0, (_EM_ZERODIVIDE | _EM_UNDERFLOW | _EM_OVERFLOW),
_MCW_EM); // Line B
#elif defined(__hpux)
#if HAVE_FESETTRAPENABLE
fesettrapenable(FE_ALL_EXCEPT);
#else
fpsetmask(FP_X_CLEAR);
#endif
#endif /* __hpux */
#if HAVE_FPU_CONTROL_H && i386 && defined(__GNUC__)
/* this will probably not work in older releases of Linux */
int v = _FPU_IEEE;
_FPU_SETCW(v);
#endif
#ifdef HAVE_SIGFPE
my_signal(SIGFPE, SIG_IGN);
#endif
}
return true;
}
#if !defined(LIGHT) && !_MSC_VER && !defined(__MINGW32__)
static void ReceiveSignal(int s, void *x, void *y) {
CACHE_REGS
LOCAL_PrologMode |= InterruptMode;
if (s == SIGINT && (LOCAL_PrologMode & ConsoleGetcMode)) {
return;
}
my_signal(s, ReceiveSignal);
switch (s) {
case SIGINT:
// always direct SIGINT to console
Yap_HandleSIGINT();
break;
case SIGALRM:
Yap_external_signal(worker_id, YAP_ALARM_SIGNAL);
break;
case SIGVTALRM:
Yap_external_signal(worker_id, YAP_VTALARM_SIGNAL);
break;
#ifndef MPW
#ifdef HAVE_SIGFPE
case SIGFPE:
Yap_external_signal(worker_id, YAP_FPE_SIGNAL);
break;
#endif
#endif
#if !defined(LIGHT) && !defined(_WIN32)
/* These signals are not handled by WIN32 and not the Macintosh */
case SIGQUIT:
case SIGKILL:
LOCAL_PrologMode &= ~InterruptMode;
Yap_Error(INTERRUPT_EVENT, MkIntTerm(s), NULL);
break;
#endif
#ifdef SIGUSR1
case SIGUSR1:
/* force the system to creep */
Yap_external_signal(worker_id, YAP_USR1_SIGNAL);
break;
#endif /* defined(SIGUSR1) */
#ifdef SIGUSR2
case SIGUSR2:
/* force the system to creep */
Yap_external_signal(worker_id, YAP_USR2_SIGNAL);
break;
#endif /* defined(SIGUSR2) */
#ifdef SIGPIPE
case SIGPIPE:
/* force the system to creep */
Yap_external_signal(worker_id, YAP_PIPE_SIGNAL);
break;
#endif /* defined(SIGPIPE) */
#ifdef SIGHUP
case SIGHUP:
/* force the system to creep */
/* Just ignore SUGHUP Yap_signal (YAP_HUP_SIGNAL); */
break;
#endif /* defined(SIGHUP) */
default:
fprintf(stderr, "\n[ Unexpected signal ]\n");
exit(s);
}
LOCAL_PrologMode &= ~InterruptMode;
}
#endif
#if (_MSC_VER || defined(__MINGW32__))
static BOOL WINAPI MSCHandleSignal(DWORD dwCtrlType) {
if (
#if THREADS
REMOTE_InterruptsDisabled(0)
#else
LOCAL_InterruptsDisabled
#endif
) {
return FALSE;
}
switch (dwCtrlType) {
case CTRL_C_EVENT:
case CTRL_BREAK_EVENT:
#if THREADS
Yap_external_signal(0, YAP_WINTIMER_SIGNAL);
REMOTE_PrologMode(0) |= InterruptMode;
#else
Yap_signal(YAP_WINTIMER_SIGNAL);
LOCAL_PrologMode |= InterruptMode;
#endif
return (TRUE);
default:
return (FALSE);
}
}
#endif
/* wrapper for alarm system call */
#if _MSC_VER || defined(__MINGW32__)
static DWORD WINAPI DoTimerThread(LPVOID targ) {
Int *time = (Int *)targ;
HANDLE htimer;
LARGE_INTEGER liDueTime;
htimer = CreateWaitableTimer(NULL, FALSE, NULL);
liDueTime.QuadPart = -10000000;
liDueTime.QuadPart *= time[0];
/* add time in usecs */
liDueTime.QuadPart -= time[1] * 10;
/* Copy the relative time into a LARGE_INTEGER. */
if (SetWaitableTimer(htimer, &liDueTime, 0, NULL, NULL, 0) == 0) {
return (FALSE);
}
if (WaitForSingleObject(htimer, INFINITE) != WAIT_OBJECT_0)
fprintf(stderr, "WaitForSingleObject failed (%ld)\n", GetLastError());
Yap_signal(YAP_WINTIMER_SIGNAL);
/* now, say what is going on */
Yap_PutValue(AtomAlarm, MkAtomTerm(AtomTrue));
ExitThread(1);
#if _MSC_VER
return (0L);
#endif
}
#endif
static Int enable_interrupts(USES_REGS1) {
LOCAL_InterruptsDisabled--;
if (LOCAL_Signals && !LOCAL_InterruptsDisabled) {
CreepFlag = Unsigned(LCL0);
if (!Yap_only_has_signal(YAP_CREEP_SIGNAL))
EventFlag = Unsigned(LCL0);
}
return TRUE;
}
static Int disable_interrupts(USES_REGS1) {
LOCAL_InterruptsDisabled++;
CalculateStackGap(PASS_REGS1);
return TRUE;
}
static Int alarm4(USES_REGS1) {
Term t = Deref(ARG1);
Term t2 = Deref(ARG2);
Int i1, i2;
if (IsVarTerm(t)) {
Yap_Error(INSTANTIATION_ERROR, t, "alarm/2");
return (FALSE);
}
if (!IsIntegerTerm(t)) {
Yap_Error(TYPE_ERROR_INTEGER, t, "alarm/2");
return (FALSE);
}
if (IsVarTerm(t2)) {
Yap_Error(INSTANTIATION_ERROR, t2, "alarm/2");
return (FALSE);
}
if (!IsIntegerTerm(t2)) {
Yap_Error(TYPE_ERROR_INTEGER, t2, "alarm/2");
return (FALSE);
}
i1 = IntegerOfTerm(t);
i2 = IntegerOfTerm(t2);
if (i1 == 0 && i2 == 0) {
#if _WIN32
Yap_get_signal(YAP_WINTIMER_SIGNAL);
#else
Yap_get_signal(YAP_ALARM_SIGNAL);
#endif
}
#if _MSC_VER || defined(__MINGW32__)
{
Term tout;
Int time[2];
time[0] = i1;
time[1] = i2;
if (time[0] != 0 && time[1] != 0) {
DWORD dwThreadId;
HANDLE hThread;
hThread = CreateThread(NULL, /* no security attributes */
0, /* use default stack size */
DoTimerThread, /* thread function */
(LPVOID)time, /* argument to thread function */
0, /* use default creation flags */
&dwThreadId); /* returns the thread identifier */
/* Check the return value for success. */
if (hThread == NULL) {
Yap_WinError("trying to use alarm");
}
}
tout = MkIntegerTerm(0);
return Yap_unify(ARG3, tout) && Yap_unify(ARG4, MkIntTerm(0));
}
#elif HAVE_SETITIMER && !SUPPORT_CONDOR
{
struct itimerval new, old;
new.it_interval.tv_sec = 0;
new.it_interval.tv_usec = 0;
new.it_value.tv_sec = i1;
new.it_value.tv_usec = i2;
if (setitimer(ITIMER_REAL, &new, &old) < 0) {
#if HAVE_STRERROR
Yap_Error(SYSTEM_ERROR_OPERATING_SYSTEM, ARG1, "setitimer: %s",
strerror(errno));
#else
Yap_Error(SYSTEM_ERROR_OPERATING_SYSTEM, ARG1, "setitimer %d", errno);
#endif
return FALSE;
}
return Yap_unify(ARG3, MkIntegerTerm(old.it_value.tv_sec)) &&
Yap_unify(ARG4, MkIntegerTerm(old.it_value.tv_usec));
}
#elif HAVE_ALARM && !SUPPORT_CONDOR
{
Int left;
Term tout;
left = alarm(i1);
tout = MkIntegerTerm(left);
return Yap_unify(ARG3, tout) && Yap_unify(ARG4, MkIntTerm(0));
}
#else
/* not actually trying to set the alarm */
if (IntegerOfTerm(t) == 0)
return TRUE;
Yap_Error(SYSTEM_ERROR_INTERNAL, TermNil,
"alarm not available in this configuration");
return FALSE;
#endif
}
static Int virtual_alarm(USES_REGS1) {
Term t = Deref(ARG1);
Term t2 = Deref(ARG2);
if (IsVarTerm(t)) {
Yap_Error(INSTANTIATION_ERROR, t, "alarm/2");
return (FALSE);
}
if (!IsIntegerTerm(t)) {
Yap_Error(TYPE_ERROR_INTEGER, t, "alarm/2");
return (FALSE);
}
if (IsVarTerm(t2)) {
Yap_Error(INSTANTIATION_ERROR, t2, "alarm/2");
return (FALSE);
}
if (!IsIntegerTerm(t2)) {
Yap_Error(TYPE_ERROR_INTEGER, t2, "alarm/2");
return (FALSE);
}
#if _MSC_VER || defined(__MINGW32__)
{
Term tout;
Int time[2];
time[0] = IntegerOfTerm(t);
time[1] = IntegerOfTerm(t2);
if (time[0] != 0 && time[1] != 0) {
DWORD dwThreadId;
HANDLE hThread;
hThread = CreateThread(NULL, /* no security attributes */
0, /* use default stack size */
DoTimerThread, /* thread function */
(LPVOID)time, /* argument to thread function */
0, /* use default creation flags */
&dwThreadId); /* returns the thread identifier */
/* Check the return value for success. */
if (hThread == NULL) {
Yap_WinError("trying to use alarm");
}
}
tout = MkIntegerTerm(0);
return Yap_unify(ARG3, tout) && Yap_unify(ARG4, MkIntTerm(0));
}
#elif HAVE_SETITIMER && !SUPPORT_CONDOR
{
struct itimerval new, old;
new.it_interval.tv_sec = 0;
new.it_interval.tv_usec = 0;
new.it_value.tv_sec = IntegerOfTerm(t);
new.it_value.tv_usec = IntegerOfTerm(t2);
if (setitimer(ITIMER_VIRTUAL, &new, &old) < 0) {
#if HAVE_STRERROR
Yap_Error(SYSTEM_ERROR_OPERATING_SYSTEM, ARG1, "setitimer: %s",
strerror(errno));
#else
Yap_Error(SYSTEM_ERROR_OPERATING_SYSTEM, ARG1, "setitimer %d", errno);
#endif
return FALSE;
}
return Yap_unify(ARG3, MkIntegerTerm(old.it_value.tv_sec)) &&
Yap_unify(ARG4, MkIntegerTerm(old.it_value.tv_usec));
}
#else
/* not actually trying to set the alarm */
if (IntegerOfTerm(t) == 0)
return TRUE;
Yap_Error(SYSTEM_ERROR_INTERNAL, TermNil,
"virtual_alarm not available in this configuration");
return FALSE;
#endif
}
#ifdef VAX
/* avoid longjmp botch */
int vax_absmi_fp;
typedef struct {
int eh;
int flgs;
int ap;
int fp;
int pc;
int dummy1;
int dummy2;
int dummy3;
int oldfp;
int dummy4;
int dummy5;
int dummy6;
int oldpc;
}
* VaxFramePtr;
VaxFixFrame(dummy) {
int maxframes = 100;
VaxFramePtr fp = (VaxFramePtr)(((int *)&dummy) - 6);
while (--maxframes) {
fp = (VaxFramePtr)fp->fp;
if (fp->flgs == 0) {
if (fp->oldfp >= &REGS[6] && fp->oldfp < &REGS[REG_SIZE])
fp->oldfp = vax_absmi_fp;
return;
}
}
}
#endif
#if defined(_WIN32)
int WINAPI win_yap(HANDLE, DWORD, LPVOID);
int WINAPI win_yap(HANDLE hinst, DWORD reason, LPVOID reserved) {
switch (reason) {
case DLL_PROCESS_ATTACH:
break;
case DLL_PROCESS_DETACH:
break;
case DLL_THREAD_ATTACH:
break;
case DLL_THREAD_DETACH:
break;
}
return 1;
}
#endif
#if (defined(YAPOR) || defined(THREADS)) && !defined(USE_PTHREAD_LOCKING)
#ifdef sparc
void rw_lock_voodoo(void);
void rw_lock_voodoo(void) {
/* code taken from the Linux kernel, it handles shifting between locks */
/* Read/writer locks, as usual this is overly clever to make it as fast as
* possible. */
/* caches... */
__asm__ __volatile__("___rw_read_enter_spin_on_wlock:\n"
" orcc %g2, 0x0, %g0\n"
" be,a ___rw_read_enter\n"
" ldstub [%g1 + 3], %g2\n"
" b ___rw_read_enter_spin_on_wlock\n"
" ldub [%g1 + 3], %g2\n"
"___rw_read_exit_spin_on_wlock:\n"
" orcc %g2, 0x0, %g0\n"
" be,a ___rw_read_exit\n"
" ldstub [%g1 + 3], %g2\n"
" b ___rw_read_exit_spin_on_wlock\n"
" ldub [%g1 + 3], %g2\n"
"___rw_write_enter_spin_on_wlock:\n"
" orcc %g2, 0x0, %g0\n"
" be,a ___rw_write_enter\n"
" ldstub [%g1 + 3], %g2\n"
" b ___rw_write_enter_spin_on_wlock\n"
" ld [%g1], %g2\n"
"\n"
" .globl ___rw_read_enter\n"
"___rw_read_enter:\n"
" orcc %g2, 0x0, %g0\n"
" bne,a ___rw_read_enter_spin_on_wlock\n"
" ldub [%g1 + 3], %g2\n"
" ld [%g1], %g2\n"
" add %g2, 1, %g2\n"
" st %g2, [%g1]\n"
" retl\n"
" mov %g4, %o7\n"
" .globl ___rw_read_exit\n"
"___rw_read_exit:\n"
" orcc %g2, 0x0, %g0\n"
" bne,a ___rw_read_exit_spin_on_wlock\n"
" ldub [%g1 + 3], %g2\n"
" ld [%g1], %g2\n"
" sub %g2, 0x1ff, %g2\n"
" st %g2, [%g1]\n"
" retl\n"
" mov %g4, %o7\n"
" .globl ___rw_write_enter\n"
"___rw_write_enter:\n"
" orcc %g2, 0x0, %g0\n"
" bne ___rw_write_enter_spin_on_wlock\n"
" ld [%g1], %g2\n"
" andncc %g2, 0xff, %g0\n"
" bne,a ___rw_write_enter_spin_on_wlock\n"
" stb %g0, [%g1 + 3]\n"
" retl\n"
" mov %g4, %o7\n");
}
#endif /* sparc */
#endif /* YAPOR || THREADS */
yap_error_number Yap_MathException__(USES_REGS1) {
#if HAVE_FETESTEXCEPT
int raised;
// #pragma STDC FENV_ACCESS ON
if ((raised = fetestexcept(FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW))) {
feclearexcept(FE_ALL_EXCEPT);
if (raised & FE_OVERFLOW) {
return EVALUATION_ERROR_FLOAT_OVERFLOW;
} else if (raised & FE_DIVBYZERO) {
return EVALUATION_ERROR_ZERO_DIVISOR;
} else if (raised & FE_UNDERFLOW) {
return EVALUATION_ERROR_FLOAT_UNDERFLOW;
//} else if (raised & (FE_INVALID|FE_INEXACT)) {
// return EVALUATION_ERROR_UNDEFINED;
} else {
return EVALUATION_ERROR_UNDEFINED;
}
}
#elif _WIN32
unsigned int raised;
int err;
// Show original FP control word and do calculation.
err = _controlfp_s(&raised, 0, 0);
if (err) {
return EVALUATION_ERROR_UNDEFINED;
}
if (raised) {
feclearexcept(FE_ALL_EXCEPT);
if (raised & FE_OVERFLOW) {
return EVALUATION_ERROR_FLOAT_OVERFLOW;
} else if (raised & FE_DIVBYZERO) {
return EVALUATION_ERROR_ZERO_DIVISOR;
} else if (raised & FE_UNDERFLOW) {
return EVALUATION_ERROR_FLOAT_UNDERFLOW;
//} else if (raised & (FE_INVALID|FE_INEXACT)) {
// return EVALUATION_ERROR_UNDEFINED;
} else {
return EVALUATION_ERROR_UNDEFINED;
}
}
#elif (defined(__svr4__) || defined(__SVR4))
switch (sip->si_code) {
case FPE_INTDIV:
return EVALUATION_ERROR_ZERO_DIVISOR;
break;
case FPE_INTOVF:
return EVALUATION_ERROR_INT_OVERFLOW;
break;
case FPE_FLTDIV:
return EVALUATION_ERROR_ZERO_DIVISOR;
break;
case FPE_FLTOVF:
return EVALUATION_ERROR_FLOAT_OVERFLOW;
break;
case FPE_FLTUND:
return EVALUATION_ERROR_FLOAT_UNDERFLOW;
break;
case FPE_FLTRES:
case FPE_FLTINV:
case FPE_FLTSUB:
default:
return EVALUATION_ERROR_UNDEFINED;
}
set_fpu_exceptions(0);
#endif
return LOCAL_Error_TYPE;
}
/* SIGINT can cause problems, if caught before full initialization */
void Yap_InitOSSignals(int wid) {
if (GLOBAL_PrologShouldHandleInterrupts) {
#if !defined(LIGHT) && !_MSC_VER && !defined(__MINGW32__) && !defined(LIGHT)
my_signal(SIGQUIT, ReceiveSignal);
my_signal(SIGKILL, ReceiveSignal);
my_signal(SIGUSR1, ReceiveSignal);
my_signal(SIGUSR2, ReceiveSignal);
my_signal(SIGHUP, ReceiveSignal);
my_signal(SIGALRM, ReceiveSignal);
my_signal(SIGVTALRM, ReceiveSignal);
#endif
#ifdef SIGPIPE
my_signal(SIGPIPE, ReceiveSignal);
#endif
#if _MSC_VER || defined(__MINGW32__)
signal(SIGINT, SIG_IGN);
SetConsoleCtrlHandler(MSCHandleSignal, TRUE);
#else
my_signal(SIGINT, ReceiveSignal);
#endif
#ifdef HAVE_SIGFPE
my_signal(SIGFPE, HandleMatherr);
#endif
#if HAVE_SIGSEGV
my_signal_info(SIGSEGV, HandleSIGSEGV);
#endif
#ifdef YAPOR_COW
signal(SIGCHLD, SIG_IGN); /* avoid ghosts */
#endif
}
}
bool Yap_set_fpu_exceptions(Term flag) { return set_fpu_exceptions(flag); }
void Yap_InitSignalPreds(void) {
CACHE_REGS
Term cm = CurrentModule;
Yap_InitCPred("$alarm", 4, alarm4, SafePredFlag | SyncPredFlag);
CurrentModule = HACKS_MODULE;
Yap_InitCPred("virtual_alarm", 4, virtual_alarm, SafePredFlag | SyncPredFlag);
Yap_InitCPred("enable_interrupts", 0, enable_interrupts, SafePredFlag);
Yap_InitCPred("disable_interrupts", 0, disable_interrupts, SafePredFlag);
my_signal_info(SIGSEGV, HandleSIGSEGV);
CurrentModule = cm;
}
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