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yap-6.3/C/sysbits.c

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/*************************************************************************
* *
* YAP Prolog *
* *
* Yap Prolog was developed at NCCUP - Universidade do Porto *
* *
* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
* *
**************************************************************************
* *
* File: sysbits.c *
* Last rev: 4/03/88 *
* mods: *
* comments: very much machine dependent routines *
* *
*************************************************************************/
#ifdef SCCS
static char SccsId[] = "%W% %G%";
#endif
/*
* In this routine we shall try to include the inevitably machine dependant
* routines. These include, for the moment : Time, A rudimentar form of
* signal handling, OS calls,
*
* Vitor Santos Costa, February 1987
*
*/
#include "Yap.h"
#include "yapio.h"
#include "eval.h"
#include "Yatom.h"
#include "Heap.h"
#include "alloc.h"
#include "tracer.h"
#include <math.h>
#if STDC_HEADERS
#include <stdlib.h>
#endif
#if HAVE_SYS_TIME_H && !defined(__MINGW32__) && !_MSC_VER
#include <sys/time.h>
#endif
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#if HAVE_SYS_WAIT_H && !defined(__MINGW32__) && !_MSC_VER
#include <sys/wait.h>
#endif
#if HAVE_STRING_H
#include <string.h>
#endif
#if !HAVE_STRNCAT
#define strncat(X,Y,Z) strcat(X,Y)
#endif
#if !HAVE_STRNCPY
#define strncpy(X,Y,Z) strcpy(X,Y)
#endif
#if HAVE_GETPWNAM
#include <pwd.h>
#endif
#if HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#if HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#if HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef _WIN32
#define _WIN32_WINNT 0x0400
#include <windows.h>
/* required for DLL compatibility */
#if HAVE_DIRECT_H
#include <direct.h>
#endif
#include <io.h>
#else
#if HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#endif
STATIC_PROTO (void InitPageSize, (void));
STATIC_PROTO (void InitTime, (void));
STATIC_PROTO (void InitWTime, (void));
STATIC_PROTO (Int p_sh, (void));
STATIC_PROTO (Int p_shell, (void));
STATIC_PROTO (Int p_system, (void));
STATIC_PROTO (Int p_mv, (void));
STATIC_PROTO (Int p_cd, (void));
STATIC_PROTO (Int p_getcwd, (void));
STATIC_PROTO (Int p_dir_sp, (void));
STATIC_PROTO (void InitRandom, (void));
STATIC_PROTO (Int p_srandom, (void));
STATIC_PROTO (Int p_alarm, (void));
STATIC_PROTO (Int p_getenv, (void));
STATIC_PROTO (Int p_putenv, (void));
#ifdef MACYAP
STATIC_PROTO (int chdir, (char *));
/* #define signal skel_signal */
#endif /* MACYAP */
STD_PROTO (void exit, (int));
#ifdef _WIN32
static void
WinError(char *yap_error)
{
char msg[256];
/* Error, we could not read time */
FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
NULL, GetLastError(),
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), msg, 256,
NULL);
Error(SYSTEM_ERROR, TermNil, "%s: %s", yap_error, msg);
}
#endif /* _WIN32 */
#define is_valid_env_char(C) ( ((C) >= 'a' && (C) <= 'z') || ((C) >= 'A' && \
(C) <= 'Z') || (C) == '_' )
int
dir_separator (int ch)
{
#ifdef MAC
return (ch == ':');
#elif ATARI || _MSC_VER
return (ch == '\\');
#elif defined(__MINGW32__)
return (ch == '\\' || ch == '/');
#else
return (ch == '/');
#endif
}
void
InitSysPath(void) {
strncpy(FileNameBuf, LIB_DIR, YAP_FILENAME_MAX);
#ifdef MAC
strncat(FileNameBuf,":", YAP_FILENAME_MAX);
#elif ATARI || _MSC_VER || defined(__MINGW32__)
strncat(FileNameBuf,"\\", YAP_FILENAME_MAX);
#else
strncat(FileNameBuf,"/", YAP_FILENAME_MAX);
#endif
strncat(FileNameBuf, "library", YAP_FILENAME_MAX);
PutValue(LookupAtom("system_library_directory"),
MkAtomTerm(LookupAtom(FileNameBuf)));
}
static Int
p_dir_sp (void)
{
#ifdef MAC
Term t = MkIntTerm(':');
#elif ATARI || _MSC_VER || defined(__MINGW32__)
Term t = MkIntTerm('\\');
#else
Term t = MkIntTerm('/');
#endif
return(unify_constant(ARG1,t));
}
int page_size;
static void
InitPageSize(void)
{
#ifdef _WIN32
SYSTEM_INFO si;
GetSystemInfo(&si);
page_size = si.dwPageSize;
#elif HAVE_UNISTD_H
#ifdef __FreeBSD__
page_size = getpagesize();
#elif defined(_AIX)
page_size = sysconf(_SC_PAGE_SIZE);
#elif !defined(_SC_PAGESIZE)
page_size = getpagesize();
#else
page_size = sysconf(_SC_PAGESIZE);
#endif
#else
bla bla
#endif
}
#ifdef SIMICS
#ifdef HAVE_GETRUSAGE
#undef HAVE_GETRUSAGE
#endif
#ifdef HAVE_TIMES
#undef HAVE_TIMES
#endif
#endif /* SIMICS */
#ifdef _WIN32
#if HAVE_GETRUSAGE
#undef HAVE_GETRUSAGE
#endif
#endif
#if HAVE_GETRUSAGE
#if HAVE_SYS_TIMES_H
#include <sys/times.h>
#endif
#if HAVE_SYS_RESOURCE_H
#include <sys/resource.h>
#endif
/* since the point YAP was started */
static struct timeval StartOfTimes;
/* since last call to runtime */
static struct timeval last_time;
/* store user time in this variable */
static void
InitTime (void)
{
struct rusage rusage;
getrusage(RUSAGE_SELF, &rusage);
last_time.tv_sec = StartOfTimes.tv_sec = rusage.ru_utime.tv_sec;
last_time.tv_usec = StartOfTimes.tv_usec = rusage.ru_utime.tv_usec;
}
Int
cputime (void)
{
struct rusage rusage;
getrusage(RUSAGE_SELF, &rusage);
return((rusage.ru_utime.tv_sec - StartOfTimes.tv_sec)) * 1000 +
((rusage.ru_utime.tv_usec - StartOfTimes.tv_usec) / 1000);
}
void cputime_interval(Int *now,Int *interval)
{
struct rusage rusage;
getrusage(RUSAGE_SELF, &rusage);
*now = (rusage.ru_utime.tv_sec - StartOfTimes.tv_sec) * 1000 +
(rusage.ru_utime.tv_usec - StartOfTimes.tv_usec) / 1000;
*interval = (rusage.ru_utime.tv_sec - last_time.tv_sec) * 1000 +
(rusage.ru_utime.tv_usec - last_time.tv_usec) / 1000;
last_time.tv_usec = rusage.ru_utime.tv_usec;
last_time.tv_sec = rusage.ru_utime.tv_sec;
}
#elif defined(_WIN32)
#ifdef __GNUC__
/* This is stolen from the Linux kernel.
The problem is that mingw32 does not seem to have acces to div */
#ifndef do_div
#define do_div(n,base) ({ \
unsigned long __upper, __low, __high, __mod; \
asm("":"=a" (__low), "=d" (__high):"A" (n)); \
__upper = __high; \
if (__high) { \
__upper = __high % (base); \
__high = __high / (base); \
} \
asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (base), "0" (__low), "1" (__upper)); \
asm("":"=A" (n):"a" (__low),"d" (__high)); \
__mod; \
})
#endif
#endif
#include <time.h>
static FILETIME StartOfTimes, last_time;
/* store user time in this variable */
static void
InitTime (void)
{
HANDLE hProcess = GetCurrentProcess();
FILETIME CreationTime, ExitTime, KernelTime, UserTime;
if (!GetProcessTimes(hProcess, &CreationTime, &ExitTime, &KernelTime, &UserTime))
WinError("could not query cputime");
last_time.dwLowDateTime = UserTime.dwLowDateTime;
last_time.dwHighDateTime = UserTime.dwHighDateTime;
StartOfTimes.dwLowDateTime = UserTime.dwLowDateTime;
StartOfTimes.dwHighDateTime = UserTime.dwHighDateTime;
}
Int
cputime (void)
{
HANDLE hProcess = GetCurrentProcess();
FILETIME CreationTime, ExitTime, KernelTime, UserTime;
if (!GetProcessTimes(hProcess, &CreationTime, &ExitTime, &KernelTime, &UserTime))
WinError("could not query cputime");
#ifdef __GNUC__
{
unsigned long long int t =
*(unsigned long long int *)&UserTime -
*(unsigned long long int *)&StartOfTimes;
return((Int)do_div(t,10000));
#endif
#ifdef _MSC_VER
LONG_INTEGER t = *(LONG_INTEGER *)&UserTime - *(LONG_INTEGER *)&StartOfTimes;
return((Int)(t/10000));
#endif
}
}
void cputime_interval(Int *now,Int *interval)
{
HANDLE hProcess = GetCurrentProcess();
FILETIME CreationTime, ExitTime, KernelTime, UserTime;
if (!GetProcessTimes(hProcess, &CreationTime, &ExitTime, &KernelTime, &UserTime))
WinError("could not query cputime");
{
#ifdef __GNUC__
unsigned long long int t1 =
*(unsigned long long int *)&UserTime -
*(unsigned long long int *)&StartOfTimes;
unsigned long long int t2 =
*(unsigned long long int *)&UserTime -
*(unsigned long long int *)&last_time;
*now = (Int)do_div(t1,10000);
*interval = (Int)do_div(t2,10000);
#endif
#ifdef _MSC_VER
LONG_INTEGER t1 = *(LONG_INTEGER *)&UserTime - *(LONG_INTEGER *)&StartOfTimes;
LONG_INTEGER t2 = *(LONG_INTEGER *)&UserTime - *(LONG_INTEGER *)&last_time;
*now = (Int)(t1/10000);
*interval = (Int)(t2/10000);
#endif
last_time.dwLowDateTime = UserTime.dwLowDateTime;
last_time.dwHighDateTime = UserTime.dwHighDateTime;
}
}
#elif HAVE_TIMES
#if defined(_WIN32)
#include <time.h>
#define TicksPerSec CLOCKS_PER_SEC
#else
#if HAVE_SYS_TIMES_H
#include <sys/times.h>
#endif
#endif
#if defined(__sun__) && defined(__svr4__)
#if HAVE_LIMITS_H
#include <limits.h>
#endif
#define TicksPerSec CLK_TCK
#endif
#if defined(__alpha) || defined(__FreeBSD__) || defined(__linux__)
#if HAVE_TIME_H
#include <time.h>
#endif
#define TicksPerSec sysconf(_SC_CLK_TCK)
#endif
#if !TMS_IN_SYS_TIME
#if HAVE_SYS_TIMES_H
#include <sys/times.h>
#endif
#endif
static clock_t StartOfTimes, last_time;
/* store user time in this variable */
static void
InitTime (void)
{
struct tms t;
times (&t);
last_time = StartOfTimes = t.tms_utime;
}
Int
cputime (void)
{
struct tms t;
times(&t);
return((t.tms_utime - StartOfTimes)*1000 / TicksPerSec);
}
void cputime_interval(Int *now,Int *interval)
{
struct tms t;
times (&t);
*now = ((t.tms_utime - StartOfTimes)*1000) / TicksPerSec;
*interval = (t.tms_utime - last_time) * 1000 / TicksPerSec;
last_time = t.tms_utime;
}
#else /* HAVE_TIMES */
#ifdef SIMICS
#include <sys/time.h>
/* since the point YAP was started */
static struct timeval StartOfTimes;
/* since last call to runtime */
static struct timeval last_time;
/* store user time in this variable */
static void
InitTime (void)
{
struct timeval tp;
gettimeofday(&tp,NULL);
last_time.tv_sec = StartOfTimes.tv_sec = tp.tv_sec;
last_time.tv_usec = StartOfTimes.tv_usec = tp.tv_usec;
}
Int
cputime (void)
{
struct timeval tp;
gettimeofday(&tp,NULL);
if (StartOfTimes.tv_usec > tp.tv_usec)
return((tp.tv_sec - StartOfTimes.tv_sec - 1) * 1000 +
(StartOfTimes.tv_usec - tp.tv_usec) /1000);
else
return((tp.tv_sec - StartOfTimes.tv_sec)) * 1000 +
((tp.tv_usec - StartOfTimes.tv_usec) / 1000);
}
void cputime_interval(Int *now,Int *interval)
{
struct timeval tp;
gettimeofday(&tp,NULL);
*now = (tp.tv_sec - StartOfTimes.tv_sec) * 1000 +
(tp.tv_usec - StartOfTimes.tv_usec) / 1000;
*interval = (tp.tv_sec - last_time.tv_sec) * 1000 +
(tp.tv_usec - last_time.tv_usec) / 1000;
last_time.tv_usec = tp.tv_usec;
last_time.tv_sec = tp.tv_sec;
}
#endif /* SIMICS */
#ifdef COMMENTED_OUT
/* This code is not working properly. I left it here to help future ports */
#ifdef MPW
#include <files.h>
#include <Events.h>
#define TicksPerSec 60.0
static double
real_cputime ()
{
return (((double) TickCount ()) / TicksPerSec);
}
#endif /* MPW */
#ifdef LATTICE
#include "osbind.h"
static long *ptime;
gettime ()
{
*ptime = *(long *) 0x462;
}
static double
real_cputime ()
{
long thetime;
ptime = &thetime;
xbios (38, gettime);
return (((double) thetime) / (Getrez () == 2 ? 70 : 60));
}
#endif /* LATTICE */
#ifdef M_WILLIAMS
#include <osbind.h>
#include <xbios.h>
static long *ptime;
static long
readtime ()
{
return (*((long *) 0x4ba));
}
static double
real_cputime ()
{
long time;
time = Supexec (readtime);
return (time / 200.0);
}
#endif /* M_WILLIAMS */
#ifdef LIGHT
#undef FALSE
#undef TRUE
#include <FileMgr.h>
#define TicksPerSec 60.0
static double
real_cputime ()
{
return (((double) TickCount ()) / TicksPerSec);
}
#endif /* LIGHT */
#endif /* COMMENTED_OUT */
#endif /* HAVE_GETRUSAGE */
#if HAVE_GETHRTIME
/* since the point YAP was started */
static hrtime_t StartOfWTimes;
/* since last call to walltime */
#define LastWtime (*(hrtime_t *)ALIGN_YAPTYPE(LastWtimePtr,hrtime_t))
static void
InitWTime (void)
{
StartOfWTimes = gethrtime();
}
static void
InitLastWtime(void) {
/* ask for twice the space in order to guarantee alignment */
LastWtimePtr = (void *)AllocCodeSpace(2*sizeof(hrtime_t));
LastWtime = StartOfWTimes;
}
Int
walltime (void)
{
hrtime_t tp = gethrtime();
/* return time in milliseconds */
return((Int)((tp-StartOfWTimes)/((hrtime_t)1000000)));
}
void walltime_interval(Int *now,Int *interval)
{
hrtime_t tp = gethrtime();
/* return time in milliseconds */
*now = (Int)((tp-StartOfWTimes)/((hrtime_t)1000000));
*interval = (Int)((tp-LastWtime)/((hrtime_t)1000000));
LastWtime = tp;
}
#elif HAVE_GETTIMEOFDAY
/* since the point YAP was started */
static struct timeval StartOfWTimes;
/* since last call to walltime */
#define LastWtime (*(struct timeval *)LastWtimePtr)
/* store user time in this variable */
static void
InitWTime (void)
{
gettimeofday(&StartOfWTimes,NULL);
}
static void
InitLastWtime(void) {
LastWtimePtr = (void *)AllocCodeSpace(sizeof(struct timeval));
LastWtime.tv_usec = StartOfWTimes.tv_usec;
LastWtime.tv_sec = StartOfWTimes.tv_sec;
}
Int
walltime (void)
{
struct timeval tp;
gettimeofday(&tp,NULL);
if (StartOfWTimes.tv_usec > tp.tv_usec)
return((tp.tv_sec - StartOfWTimes.tv_sec - 1) * 1000 +
(StartOfWTimes.tv_usec - tp.tv_usec) /1000);
else
return((tp.tv_sec - StartOfWTimes.tv_sec)) * 1000 +
((tp.tv_usec - LastWtime.tv_usec) / 1000);
}
void walltime_interval(Int *now,Int *interval)
{
struct timeval tp;
gettimeofday(&tp,NULL);
*now = (tp.tv_sec - StartOfWTimes.tv_sec) * 1000 +
(tp.tv_usec - StartOfWTimes.tv_usec) / 1000;
*interval = (tp.tv_sec - LastWtime.tv_sec) * 1000 +
(tp.tv_usec - LastWtime.tv_usec) / 1000;
LastWtime.tv_usec = tp.tv_usec;
LastWtime.tv_sec = tp.tv_sec;
}
#elif defined(_WIN32)
#include <sys/timeb.h>
#include <time.h>
/* since the point YAP was started */
static struct timeb StartOfWTimes;
/* since last call to walltime */
#define LastWtime (*(struct timeb *)LastWtimePtr)
/* store user time in this variable */
static void
InitWTime (void)
{
ftime(&StartOfWTimes);
}
static void
InitLastWtime(void) {
LastWtimePtr = (void *)AllocCodeSpace(sizeof(struct timeb));
LastWtime.time = StartOfWTimes.time;
LastWtime.millitm = StartOfWTimes.millitm;
}
Int
walltime (void)
{
struct timeb tp;
ftime(&tp);
if (StartOfWTimes.millitm > tp.millitm)
return((tp.time - StartOfWTimes.time - 1) * 1000 +
(StartOfWTimes.millitm - tp.millitm));
else
return((tp.time - StartOfWTimes.time)) * 1000 +
((tp.millitm - LastWtime.millitm) / 1000);
}
void walltime_interval(Int *now,Int *interval)
{
struct timeb tp;
ftime(&tp);
*now = (tp.time - StartOfWTimes.time) * 1000 +
(tp.millitm - StartOfWTimes.millitm);
*interval = (tp.time - LastWtime.time) * 1000 +
(tp.millitm - LastWtime.millitm) ;
LastWtime.millitm = tp.millitm;
LastWtime.time = tp.time;
}
#elif HAVE_TIMES
static clock_t StartOfWTimes;
#define LastWtime (*(clock_t *)LastWtimePtr)
/* store user time in this variable */
static void
InitWTime (void)
{
StartOfWTimes = times(NULL);
}
static void
InitLastWtime(void) {
LastWtimePtr = (void *)AllocCodeSpace(sizeof(clock_t));
LastWtime = StartOfWTimes;
}
Int
walltime (void)
{
clock_t t;
t = times(NULL);
return ((t - StartOfWTimes)*1000 / TicksPerSec));
}
void walltime_interval(Int *now,Int *interval)
{
clock_t t;
t = times(NULL);
*now = ((t - StartOfWTimes)*1000) / TicksPerSec;
*interval = (t - LastWtime) * 1000 / TicksPerSec;
}
#endif /* HAVE_TIMES */
#if HAVE_TIME_H
#include <time.h>
#endif
unsigned int current_seed;
static void
InitRandom (void)
{
current_seed = (unsigned int) time (NULL);
#if HAVE_RANDOM
srandom (current_seed);
#elif HAVE_RAND
srand (current_seed);
#endif
}
STD_PROTO (extern int rand, (void));
double
yap_random (void)
{
#if HAVE_RANDOM
/* extern long random (); */
return (((double) random ()) / 0x7fffffffL /* 2**31-1 */);
#elif HAVE_RAND
return (((double) (rand ()) / RAND_MAX));
#else
Error(SYSTEM_ERROR, TermNil,
"random not available in this configuration");
return (0.0);
#endif
}
static Int
p_srandom (void)
{
register Term t0 = Deref (ARG1);
if (IsVarTerm (t0)) {
return(unify(ARG1,MkIntegerTerm((Int)current_seed)));
}
if(!IsNumTerm (t0))
return (FALSE);
if (IsIntTerm (t0))
current_seed = (unsigned int) IntOfTerm (t0);
else if (IsFloatTerm (t0))
current_seed = (unsigned int) FloatOfTerm (t0);
else
current_seed = (unsigned int) LongIntOfTerm (t0);
#if HAVE_RANDOM
srandom(current_seed);
#elif HAVE_RAND
srand(current_seed);
#endif
return (TRUE);
}
#if HAVE_SIGNAL
#include <signal.h>
#ifdef MPW
#define signal sigset
#endif
#ifdef MSH
#define SIGFPE SIGDIV
#endif
STATIC_PROTO (void InitSignals, (void));
#if defined(__svr4__)
#if HAVE_SIGINFO_H
#include <siginfo.h>
#endif
#if HAVE_SYS_UCONTEXT_H
#include <sys/ucontext.h>
#endif
STATIC_PROTO (void HandleSIGSEGV, (int, siginfo_t *, ucontext_t *));
STATIC_PROTO (void HandleMatherr, (int, siginfo_t *, ucontext_t *));
STATIC_PROTO (void my_signal_info, (int, void (*)(int, siginfo_t *, ucontext_t *)));
STATIC_PROTO (void my_signal, (int, void (*)(int, siginfo_t *, ucontext_t *)));
/* This routine believes there is a continuous space starting from the
HeapBase and ending on TrailTop */
static void
HandleSIGSEGV(int sig, siginfo_t *sip, ucontext_t *uap)
{
if (sip->si_code != SI_NOINFO &&
sip->si_code == SEGV_MAPERR &&
(void *)(sip->si_addr) > (void *)(HeapBase) &&
(void *)(sip->si_addr) < (void *)(TrailTop+64 * 1024L) ) {
growtrail(64 * 1024L);
}
else {
Error(INTERNAL_ERROR, TermNil,
"likely bug in YAP, segmentation violation at %p", sip->si_addr);
}
}
static void
HandleMatherr(int sig, siginfo_t *sip, ucontext_t *uap)
{
yap_error_number error_no;
/* reset the registers so that we don't have trash in abstract machine */
switch(sip->si_code) {
case FPE_INTDIV:
error_no = EVALUATION_ERROR_ZERO_DIVISOR;
break;
case FPE_INTOVF:
error_no = EVALUATION_ERROR_INT_OVERFLOW;
break;
case FPE_FLTDIV:
error_no = EVALUATION_ERROR_ZERO_DIVISOR;
break;
case FPE_FLTOVF:
error_no = EVALUATION_ERROR_FLOAT_OVERFLOW;
break;
case FPE_FLTUND:
error_no = EVALUATION_ERROR_FLOAT_UNDERFLOW;
break;
case FPE_FLTRES:
case FPE_FLTINV:
case FPE_FLTSUB:
default:
error_no = EVALUATION_ERROR_UNDEFINED;
}
YAP_matherror = error_no;
siglongjmp(RestartEnv, 2);
}
static void
my_signal_info(int sig, void (*handler)(int, siginfo_t *, ucontext_t *))
{
struct sigaction sigact;
sigact.sa_handler = handler;
sigemptyset(&sigact.sa_mask);
sigact.sa_flags = SA_SIGINFO|SA_RESTART;
sigaction(sig,&sigact,NULL);
}
static void
my_signal(int sig, void (*handler)(int, siginfo_t *, ucontext_t *))
{
struct sigaction sigact;
sigact.sa_handler=handler;
sigemptyset(&sigact.sa_mask);
sigact.sa_flags = 0
;
sigaction(sig,&sigact,NULL);
}
#else
STATIC_PROTO (RETSIGTYPE HandleMatherr, (int));
STATIC_PROTO (RETSIGTYPE HandleSIGSEGV, (int));
STATIC_PROTO (void my_signal_info, (int, void (*)(int)));
STATIC_PROTO (void my_signal, (int, void (*)(int)));
/******** Handling floating point errors *******************/
/* old code, used to work with matherror(), deprecated now:
char err_msg[256];
switch (x->type)
{
case DOMAIN:
case SING:
Error(EVALUATION_ERROR_UNDEFINED, TermNil, "%s", x->name);
return(0);
case OVERFLOW:
Error(EVALUATION_ERROR_FLOAT_OVERFLOW, TermNil, "%s", x->name);
return(0);
case UNDERFLOW:
Error(EVALUATION_ERROR_FLOAT_UNDERFLOW, TermNil, "%s", x->name);
return(0);
case PLOSS:
case TLOSS:
Error(EVALUATION_ERROR_UNDEFINED, TermNil, "%s(%g) = %g", x->name,
x->arg1, x->retval);
return(0);
default:
Error(EVALUATION_ERROR_UNDEFINED, TermNil, NULL);
return(0);
}
*/
#if HAVE_FENV_H
#include <fenv.h>
#endif
#ifdef __linux__
/* fetestexcept does not seem to work in linux :-( :-( */
#undef HAVE_FETESTEXCEPT
#endif
static RETSIGTYPE
HandleMatherr(int sig)
{
#if HAVE_FETESTEXCEPT
/* This should work in Linux, but it doesn't seem to. */
int raised = fetestexcept(FE_ALL_EXCEPT);
feclearexcept(FE_ALL_EXCEPT);
if (raised & FE_OVERFLOW) {
YAP_matherror = EVALUATION_ERROR_FLOAT_OVERFLOW;
} else if (raised & (FE_INVALID|FE_INEXACT)) {
YAP_matherror = EVALUATION_ERROR_UNDEFINED;
} else if (raised & FE_DIVBYZERO) {
YAP_matherror = EVALUATION_ERROR_ZERO_DIVISOR;
} else if (raised & FE_UNDERFLOW) {
YAP_matherror = EVALUATION_ERROR_FLOAT_UNDERFLOW;
} else {
YAP_matherror = EVALUATION_ERROR_UNDEFINED;
}
else
#endif
YAP_matherror = EVALUATION_ERROR_UNDEFINED;
/* something very bad happened on the way to the forum */
my_signal (SIGFPE, HandleMatherr);
/* do a longjmp because Linux is an idiot, and it makes our life
easier anyway, but not an abort!!
*/
siglongjmp(RestartEnv, 2);
}
static void
SearchForTrailFault(void)
{
/* 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
*/
#ifdef DEBUG
/* fprintf(stderr,"Catching a sigsegv at %p with %p\n", TR, TrailTop); */
#endif
#ifndef FIXED_STACKS
if ((TR > (tr_fr_ptr)TrailTop-1024 &&
TR < (tr_fr_ptr)TrailTop+(64*1024))|| DBTrailOverflow()) {
if (!growtrail(64 * 1024L)) {
YP_fprintf(YP_stderr, "[ ERROR: YAP failed to reserve %ld bytes in growtrail ]\n",64*1024L);
Abort("");
}
/* just in case, make sure the OS keeps the signal handler. */
/* my_signal_info(SIGSEGV, HandleSIGSEGV); */
} else
#endif /* FIXED_STACKS */
Error(FATAL_ERROR, TermNil,
"likely bug in YAP, segmentation violation");
}
static RETSIGTYPE
HandleSIGSEGV(int sig)
{
SearchForTrailFault();
}
#ifdef HAVE_SIGACTION
#if !defined(SA_RESTART)
/* sunos machine has no SA_RESTART, as most other 4.2BSD based machines */
#define SA_RESTART 0
#endif
static void
my_signal_info(int sig, void (*handler)(int))
{
struct sigaction sigact;
sigact.sa_handler = handler;
sigemptyset(&sigact.sa_mask);
sigact.sa_flags = SA_RESTART;
sigaction(sig,&sigact,NULL);
}
static void
my_signal(int sig, void (*handler)(int))
{
struct sigaction sigact;
sigact.sa_handler=handler;
sigemptyset(&sigact.sa_mask);
sigact.sa_flags = SA_RESTART;
sigaction(sig,&sigact,NULL);
}
#else
static void
my_signal(int sig, void (*handler)(int))
{
signal(sig, handler);
}
static void
my_signal_info(sig, handler)
int sig;
void (*handler)(int);
{
if(signal(sig, handler) == SIG_ERR)
exit(1);
}
#endif /* __linux__ */
#endif
void
ProcessSIGINT(void)
{
while (TRUE) {
int ch;
#ifdef MPW
int ch0;
#endif
YP_fprintf(YP_stderr, "\nAction (h for help): ");
ch = YP_getchar ( );
#if HAVE_LIBREADLINE
if (!in_readline)
#endif
while ((YP_getchar()) != '\n');
switch (ch)
{
case 'a':
/* abort computation, but take care in case we are within readline
code */
if (!(PrologMode & CritMode))
{
#if HAVE_SIGPROCMASK
sigset_t sig_set;
sigemptyset(&sig_set);
sigaddset(&sig_set, SIGINT);
sigprocmask(SIG_UNBLOCK, &sig_set, NULL);
#elif HAVE_SIGGETMASK
sigsetmask (siggetmask () ^ (1 << (SIGINT - 1)));
#endif
#ifdef VAX
VaxFixFrame (CritMode);
#endif
#if HAVE_LIBREADLINE
/* we cannot abort until we finish readline :-( */
if (in_readline) {
/* readline must eat a newline, otherwise we will
have to wait before we do the Abort() */
} else {
#endif
#if defined(__MINGW32__) || _MSC_VER
/* we can't do a direct abort, so ask the system to do it for us */
p_creep();
PutValue(AtomThrow, MkAtomTerm(AtomTrue));
#else
Abort ((char *) NULL);
#endif
#if HAVE_LIBREADLINE
}
#endif
}
PrologMode |= AbortMode;
return;
case 'c':
/* continue */
return;
case 'e':
/* exit */
exit_yap(0, "");
case 't':
/* start tracing */
PutValue (LookupAtom ("debug"), MkIntTerm (1));
PutValue (LookupAtom ("spy_sl"), MkIntTerm (0));
PutValue (LookupAtom ("spy_creep"), MkIntTerm (1));
p_creep ();
return;
#ifdef LOW_LEVEL_TRACER
case 'T':
toggle_low_level_trace();
return;
#endif
case 'd':
/* enter debug mode */
PutValue (LookupAtom ("debug"), MkIntTerm (1));
return;
case 's':
/* show some statistics */
#if SHORT_INTS==0
YP_fprintf(YP_stderr, "aux. stack: %d ", Unsigned (AuxTop) -
Unsigned (LCL0 + 1));
if (Unsigned (AuxSp) <= Unsigned (LCL0))
YP_fprintf(YP_stderr, "( 0 bytes used)\n");
else
YP_fprintf(YP_stderr, "( %d bytes used)\n",
Unsigned (AuxSp) - Unsigned (LCL0 + 1));
YP_fprintf(YP_stderr, "heap space: %d ", Unsigned (AuxTop) -
Unsigned (HeapBase));
YP_fprintf(YP_stderr, "( %d bytes used for heap",
Unsigned (HeapUsed));
YP_fprintf(YP_stderr, " and %d bytes used for trail)\n",
Unsigned (TR) - Unsigned (TrailBase));
YP_fprintf(YP_stderr, "stack space: %d ", Unsigned (LCL0) -
Unsigned (H0));
YP_fprintf(YP_stderr, "( %d bytes used for local",
Unsigned (LCL0) - Unsigned (ASP));
YP_fprintf(YP_stderr, " and %d bytes used for global)\n",
Unsigned (H) - Unsigned (H0));
#else
YP_fprintf(YP_stderr, "aux. stack: %ld ", Unsigned (AuxTop) -
Unsigned (LCL0 + 1));
if (Unsigned (AuxSp) <= Unsigned (LCL0))
YP_fprintf(YP_stderr, "( 0 bytes used)\n");
else
YP_fprintf(YP_stderr, "( %ld bytes used)\n",
Unsigned (AuxSp) - Unsigned (LCL0 + 1));
YP_fprintf(YP_stderr, "heap space: %ld ", Unsigned (AuxTop) -
Unsigned (HeapBase));
YP_fprintf(YP_stderr, "( %ld bytes used for heap",
Unsigned (HeapUsed));
YP_fprintf(YP_stderr, " and %ld bytes used for trail)\n",
Unsigned (TR) - Unsigned (TrailBase));
YP_fprintf(YP_stderr, "stack space: %ld ", Unsigned (LCL0) -
Unsigned (H0));
YP_fprintf(YP_stderr, "( %ld bytes used for local",
Unsigned (LCL0) - Unsigned (ASP));
YP_fprintf(YP_stderr, " and %ld bytes used for global)\n",
Unsigned (H) - Unsigned (H0));
#endif
#if SHORT_INTS
YP_fprintf(YP_stderr, "Runtime: %lds.\n", runtime ());
YP_fprintf(YP_stderr, "Cputime: %lds.\n", cputime ());
YP_fprintf(YP_stderr, "Walltime: %lds.\n", walltime ());
#else
YP_fprintf(YP_stderr, "Runtime: %ds.\n", runtime ());
YP_fprintf(YP_stderr, "Cputime: %ds.\n", cputime ());
YP_fprintf(YP_stderr, "Walltime: %ds.\n", walltime ());
#endif
break;
case EOF:
/* ignore end of file */
break;
case 'h':
case '?':
default:
/* show an helpful message */
YP_fprintf(YP_stderr, "Please press one of:\n");
YP_fprintf(YP_stderr, " a for abort\n c for continue\n d for debug\n");
YP_fprintf(YP_stderr, " e for exit\n t for trace\n s for statistics\n");
break;
}
#if HAVE_LIBREADLINE
/* we must do the reading now, because libreadline won't have a chance here */
while ((YP_getchar()) != '\n');
#endif
}
}
static RETSIGTYPE
#if defined(__svr4__)
HandleSIGINT (int sig, siginfo_t *x, ucontext_t *y)
#else
HandleSIGINT (int sig)
#endif
{
#if defined(__MINGW32__) || _MSC_VER
extern int in_getc;
if (in_getc) {
/* YP_ungetc(YP_stdin,'\n');
PrologMode |= InterruptMode; */
in_getc = FALSE;
return;
}
#else
#ifdef HAVE_SETBUF
/* make sure we are not waiting for the end of line */
YP_setbuf (stdin, NULL);
#endif
my_signal(SIGINT, HandleSIGINT);
#endif
if (snoozing)
{
snoozing = FALSE;
return;
}
ProcessSIGINT();
}
#if !defined(_WIN32)
/* this routine is called if the system activated the alarm */
static RETSIGTYPE
#if defined(__svr4__)
HandleALRM (int s, siginfo_t *x, ucontext_t *y)
#else
HandleALRM(int s)
#endif
{
/* force the system to creep */
p_creep ();
/* now, say what is going on */
PutValue(AtomAlarm, MkAtomTerm(AtomTrue));
my_signal (SIGALRM, HandleALRM);
}
#endif
/*
* This function is called after a normal interrupt had been caught It allows
* 6 possibilities : abort, continue, trace, debug, help, exit
*/
static RETSIGTYPE
#if defined(__svr4__)
ReceiveSignal (int s, siginfo_t *x, ucontext_t *y)
#else
ReceiveSignal (int s)
#endif
{
switch (s)
{
#ifndef MPW
case SIGFPE:
my_signal (SIGFPE, HandleMatherr);
Abort ("[ Fatal error: floating point exception ]");
break;
#endif
#if !defined(LIGHT) && !defined(_WIN32)
/* These signals are not handled by WIN32 and not the Macintosh */
case SIGQUIT:
case SIGKILL:
exit_yap (SIGKILL, "\n\n\n[ Quit signal received ]\n\n");
#endif
default:
YP_fprintf(YP_stderr, "\n[ Unexpected signal ]\n");
exit (FALSE);
}
}
#if _MSC_VER || defined(__MINGW32__)
static BOOL WINAPI MSCHandleSignal(DWORD dwCtrlType) {
switch(dwCtrlType) {
case CTRL_C_EVENT:
HandleSIGINT(SIGINT);
break;
case CTRL_BREAK_EVENT:
HandleSIGINT(SIGINT);
break;
default:
exit_yap(1, "[ SYSTEM ERROR: Received Termination Event ]\n");
}
return(TRUE);
}
#endif
/* SIGINT can cause problems, if caught before full initialization */
static void
InitSignals (void)
{
#if _MSC_VER || defined(__MINGW32__)
SetConsoleCtrlHandler(MSCHandleSignal,TRUE);
#else
my_signal (SIGINT, HandleSIGINT);
#ifndef MPW
my_signal (SIGFPE, HandleMatherr);
#if !defined(LIGHT) && !defined(_WIN32)
my_signal (SIGQUIT, ReceiveSignal);
#endif
#endif
#if !defined(LIGHT) && !defined(_WIN32)
my_signal (SIGKILL, ReceiveSignal);
#endif
#if HAVE_SIGSEGV
my_signal_info (SIGSEGV, HandleSIGSEGV);
#endif
#if !defined(LIGHT) && !defined(_WIN32)
my_signal(SIGALRM, HandleALRM);
#endif
#endif
#ifdef ACOW
signal(SIGCHLD, SIG_IGN); /* avoid ghosts */
#endif
}
#endif /* HAVE_SIGNAL */
char *
pfgets (char *s, int n, FILE *stream)
{
char *res;
do
res = YP_fgets (s, n, stream);
while (res == NULL && errno == EINTR);
return (res);
}
/* TrueFileName -> Finds the true name of a file */
#ifdef __MINGW32__
#include <ctype.h>
#endif
int
volume_header(char *file)
{
#if _MSC_VER || defined(__MINGW32__)
char *ch = file;
int c;
while ((c = ch[0]) != '\0') {
if (isalnum(c)) ch++;
else return(c == ':');
}
#endif
return(FALSE);
}
int TrueFileName (char *source, char *result, int in_lib)
{
register int ch;
register char *res0 = result, *work;
char ares1[YAP_FILENAME_MAX], *res1 = ares1;
char *var_name;
result[0] = '\0';
#if defined(__MINGW32__) || _MSC_VER
/* step 0: replace / by \ */
{
char *p = source, ch = p[0];
while (ch != '\0') {
if (ch == '/') p[0] = '\\';
p++;
ch = p[0];
}
}
#endif
/* step 1: eating home information */
if (source[0] == '~')
{
if (dir_separator(source[1]) || source[1] == '\0')
{
char *s;
source++;
#if defined(_WIN32)
s = getenv("HOMEDRIVE");
if (s != NULL)
strncpy (result, getenv ("HOMEDRIVE"), YAP_FILENAME_MAX);
s = getenv("HOMEPATH");
if (s != NULL)
strncpy (result, s, YAP_FILENAME_MAX);
#else
s = getenv ("HOME");
if (s != NULL)
strncpy (result, s, YAP_FILENAME_MAX);
#endif
}
#if HAVE_GETPWNAM
else
{
struct passwd *user_passwd;
source++;
while (!dir_separator((*res0 = *source)) && *res0 != '\0')
res0++, source++;
*res0++ = '\0';
if ((user_passwd = getpwnam (result)) == NULL)
{
return(FALSE);
}
strncpy (result, user_passwd->pw_dir, YAP_FILENAME_MAX);
}
#endif
strncat (result, source, YAP_FILENAME_MAX);
}
else
strncpy (result, source, YAP_FILENAME_MAX);
/* step 2: handling environment variables in file names */
strncpy (ares1, result, YAP_FILENAME_MAX);
res0 = result;
while ((ch = *res1++)!=0)
{
if (ch == '\\' && !dir_separator('\\'))
{
ch = *res1++;
if (ch == '\0')
{
*res0 = '\0';
break;
}
else
*res0++ = ch;
}
if (ch != '$')
*res0++ = ch;
else
{
char env_var[256], *sptr = env_var;
while (((ch = *res1)!=0) && is_valid_env_char (ch))
{
res1++;
*sptr++ = ch;
}
*sptr = '\0';
if ((var_name = (char *) getenv (env_var)) == NULL)
{
return(FALSE);
}
else
while ((*res0 = *var_name++)!=0)
res0++;
}
}
*res0 = '\0';
/* step 3: get the full file name */
if (!dir_separator(result[0]) && !volume_header(result))
{
#if __simplescalar__
/* does not implement getcwd */
strncpy(ares1,".",YAP_FILENAME_MAX);
#elif HAVE_GETCWD
if (getcwd (ares1, YAP_FILENAME_MAX) == NULL)
return (FALSE);
#else
if (getwd (ares1) == NULL)
return (FALSE);
#endif
#if _MSC_VER || defined(__MINGW32__)
strncat (ares1, "\\", YAP_FILENAME_MAX);
#else
strncat (ares1, "/", YAP_FILENAME_MAX);
#endif
strncat (ares1, result, YAP_FILENAME_MAX);
if (in_lib) {
int tmpf;
if ((tmpf = open(ares1, O_RDONLY)) < 0) {
/* not in current directory, let us try the library */
if (Yap_LibDir != NULL) {
strncpy(FileNameBuf, Yap_LibDir, YAP_FILENAME_MAX);
#if HAVE_GETENV
} else {
char *yap_env = getenv("YAPLIBDIR");
if (yap_env != NULL) {
strncpy(ares1, yap_env, YAP_FILENAME_MAX);
#endif
} else {
strncpy(ares1, LIB_DIR, YAP_FILENAME_MAX);
}
#if HAVE_GETENV
}
#endif
#if _MSC_VER || defined(__MINGW32__)
strncat(ares1,"\\", YAP_FILENAME_MAX);
#else
strncat(ares1,"/", YAP_FILENAME_MAX);
#endif
strncat(ares1,result, YAP_FILENAME_MAX);
if ((tmpf = open(ares1, O_RDONLY)) >= 0) {
close(tmpf);
strncpy (result, ares1, YAP_FILENAME_MAX);
}
} else {
strncpy (result, ares1, YAP_FILENAME_MAX);
close(tmpf);
}
} else {
strncpy (result, ares1, YAP_FILENAME_MAX);
}
}
/* step 4: simplifying the file name */
work = result;
while (*work != '\0')
{
char *new_work, *next_work;
if (*work++ != '.')
continue;
if (*work != '.')
{
if (!dir_separator(*work) || !dir_separator(work[-2]))
continue;
next_work = work + 1;
new_work = --work;
}
else
{
if (!dir_separator(work[1]) || !dir_separator(work[-2]))
continue;
next_work = work + 2;
work -= 2;
if (work == result)
return (FALSE);
while (!dir_separator(*--work) && work != result);
if (work == result && !dir_separator(work[0]))
return (FALSE);
new_work = ++work;
}
while ((*new_work++ = *next_work++)!=0);
}
return (TRUE);
}
static Int
p_getcwd(void)
{
Term t;
#if __simplescalar__
/* does not implement getcwd */
strncpy(FileNameBuf,".",YAP_FILENAME_MAX);
#elif HAVE_GETCWD
if (getcwd (FileNameBuf, YAP_FILENAME_MAX) == NULL)
return (FALSE);
#else
if (getwd (FileNameBuf) == NULL)
return (FALSE);
#endif
t = StringToList(FileNameBuf);
return(unify(ARG1,t));
}
/* Executes $SHELL under Prolog */
static Int
p_sh (void)
{ /* sh */
#ifdef HAVE_SYSTEM
register char *shell;
shell = (char *) getenv ("SHELL");
if (shell == NULL)
shell = "/bin/sh";
/* CloseStreams(TRUE); */
if (system (shell) < 0) {
#if HAVE_STRERROR
Error(SYSTEM_ERROR, TermNil,
"sh: %s", strerror(errno));
#else
Error(SYSTEM_ERROR, TermNil,
"sh");
#endif
return (FALSE);
}
return (TRUE);
#else
#ifdef MSH
register char *shell;
shell = "msh -i";
/* CloseStreams(); */
system (shell);
return (TRUE);
#else
Error(SYSTEM_ERROR,TermNil,"sh not available in this configuration");
return(FALSE);
#endif /* MSH */
#endif
}
static Int
p_shell (void)
{ /* '$shell'(+SystCommand) */
#if _MSC_VER || defined(__MINGW32__)
return(0);
#else
#if HAVE_SYSTEM
char *shell;
char *command = AllocTmpSpaceFromGlobal();
register int bourne = FALSE;
Term t1 = Deref (ARG1);
if (!GetName (command, t1)) {
Error(SYSTEM_ERROR,t1,"invalid argument to shell/1");
return(FALSE);
}
shell = (char *) getenv ("SHELL");
if (!strcmp (shell, "/bin/sh"))
bourne = TRUE;
if (shell == NIL)
bourne = TRUE;
/* CloseStreams(TRUE); */
if (bourne)
return (system (command) == 0);
else
{
int status = -1;
int child = fork ();
if (child == 0)
{ /* let the children go */
execl (shell, shell, "-c", command, NIL);
exit (TRUE);
}
{ /* put the father on wait */
int result = child < 0 ||
/* vsc:I am not sure this is used, Stevens say wait returns an integer.
#if NO_UNION_WAIT
*/
wait ((&status)) != child ||
/*
#else
wait ((union wait *) (&status)) != child ||
#endif
*/
status == 0;
return (result);
}
}
#else /* HAVE_SYSTEM */
#ifdef MSH
register char *shell;
shell = "msh -i";
/* CloseStreams(); */
system (shell);
return (TRUE);
#else
Error (SYSTEM_ERROR,TermNil,"shell not available in this configuration");
return(FALSE);
#endif
#endif /* HAVE_SYSTEM */
#endif /* _MSC_VER */
}
static Int
p_system (void)
{ /* '$system'(+SystCommand) */
#ifdef HAVE_SYSTEM
char *command = AllocTmpSpaceFromGlobal();
Term t1 = Deref (ARG1);
if (!GetName (command, t1)) {
Error(SYSTEM_ERROR,t1,"argument to system/1 is not valid");
return(FALSE);
}
/* CloseStreams(TRUE); */
#if _MSC_VER
_flushall();
#endif
return (system (command) == 0);
#else
#ifdef MSH
register char *shell;
shell = "msh -i";
/* CloseStreams(); */
system (shell);
return (TRUE);
#else
Error(SYSTEM_ERROR,TermNil,"sh not available in this machine");
return(FALSE);
#endif
#endif /* HAVE_SYSTEM */
}
/* Rename a file */
static Int
p_mv (void)
{ /* rename(+OldName,+NewName) */
#if HAVE_LINK
int r;
char oldname[YAP_FILENAME_MAX], newname[YAP_FILENAME_MAX];
Term t1 = Deref (ARG1);
Term t2 = Deref (ARG2);
if (!GetName (FileNameBuf, t1)) {
Error(SYSTEM_ERROR,t1,"first argument to rename/2 is not valid");
return(FALSE);
}
TrueFileName (FileNameBuf, oldname, FALSE);
if (!GetName (FileNameBuf, t2)) {
Error(SYSTEM_ERROR,t2,"second argument to rename/2 is not valid");
return(FALSE);
}
TrueFileName (FileNameBuf, newname, FALSE);
if ((r = link (oldname, newname)) == 0 && (r = unlink (oldname)) != 0)
unlink (newname);
if (r != 0) {
Error(SYSTEM_ERROR,t2,"operating system error in rename/2");
return(FALSE);
}
return (TRUE);
#else
Error(SYSTEM_ERROR,TermNil,"rename/2 not available in this machine");
return (FALSE);
#endif
}
/* Change the working directory */
static Int
p_cd (void)
{ /* cd(+NewD) */
#if HAVE_CHDIR
Term t1 = Deref (ARG1);
if (t1 == TermNil)
return(TRUE);
if (!GetName (FileNameBuf, t1)) {
Error(SYSTEM_ERROR,t1,"argument to cd/1 is not valid");
return(FALSE);
}
TrueFileName (FileNameBuf, FileNameBuf2, FALSE);
return (!chdir (FileNameBuf2));
#else
#ifdef MACYAP
Term t1 = Deref (ARG1);
if (!GetName (FileNameBuf, t1)) {
Error(SYSTEM_ERROR,t1,"argument to cd/1 is not valid");
return(FALSE);
}
TrueFileName (FileNameBuf, FileNameBuf2, FALSE);
return (!chdir (FileNameBuf2));
#else
Error(SYSTEM_ERROR,TermNil,"cd/1 not available in this machine");
return(FALSE);
#endif
#endif
}
#ifdef MAC
void
SetTextFile (name)
char *name;
{
#ifdef MACC
SetFileType (name, 'TEXT');
SetFileSignature (name, 'EDIT');
#else
FInfo f;
FInfo *p = &f;
GetFInfo (name, 0, p);
p->fdType = 'TEXT';
#ifdef MPW
if (mpwshell)
p->fdCreator = 'MPS\0';
#endif
#ifndef LIGHT
else
p->fdCreator = 'EDIT';
#endif
SetFInfo (name, 0, p);
#endif
}
#endif
/* return YAP's environment */
static Int p_getenv(void)
{
#if HAVE_GETENV
Term t1 = Deref(ARG1), to;
char *s, *so;
if (IsVarTerm(t1)) {
Error(INSTANTIATION_ERROR, t1,
"first arg of getenv/2");
return(FALSE);
} else if (!IsAtomTerm(t1)) {
Error(TYPE_ERROR_ATOM, t1,
"first arg of getenv/2");
return(FALSE);
} else s = RepAtom(AtomOfTerm(t1))->StrOfAE;
if ((so = getenv(s)) == NULL)
return(FALSE);
to = MkAtomTerm(LookupAtom(so));
return(unify_constant(ARG2,to));
#else
Error(SYSTEM_ERROR, TermNil,
"getenv not available in this configuration");
return (FALSE);
#endif
}
/* set a variable in YAP's environment */
static Int p_putenv(void)
{
#if HAVE_PUTENV
Term t1 = Deref(ARG1), t2 = Deref(ARG2);
char *s, *s2, *p0, *p;
if (IsVarTerm(t1)) {
Error(INSTANTIATION_ERROR, t1,
"first arg to putenv/2");
return(FALSE);
} else if (!IsAtomTerm(t1)) {
Error(TYPE_ERROR_ATOM, t1,
"first arg to putenv/2");
return(FALSE);
} else s = RepAtom(AtomOfTerm(t1))->StrOfAE;
if (IsVarTerm(t2)) {
Error(INSTANTIATION_ERROR, t1,
"second arg to putenv/2");
return(FALSE);
} else if (!IsAtomTerm(t2)) {
Error(TYPE_ERROR_ATOM, t2,
"second arg to putenv/2");
return(FALSE);
} else s2 = RepAtom(AtomOfTerm(t2))->StrOfAE;
p0 = p = AllocAtomSpace(strlen(s)+strlen(s2)+3);
while ((*p++ = *s++) != '\0');
p[-1] = '=';
while ((*p++ = *s2++) != '\0');
if (putenv(p0) == 0)
return(TRUE);
#if HAVE_STRERROR
Error(SYSTEM_ERROR, TermNil,
"putenv: %s", strerror(errno));
#else
Error(SYSTEM_ERROR, TermNil,
"putenv");
#endif
return (FALSE);
#else
Error(SYSTEM_ERROR, TermNil,
"putenv not available in this configuration");
return (FALSE);
#endif
}
/* wrapper for alarm system call */
#if defined(_WIN32)
static VOID CALLBACK HandleTimer(LPVOID v, DWORD d1, DWORD d2) {
/* force the system to creep */
p_creep ();
/* now, say what is going on */
PutValue(AtomAlarm, MkAtomTerm(AtomTrue));
}
#endif
static Int
p_alarm(void)
{
Term t = Deref(ARG1);
if (IsVarTerm(t)) {
Error(INSTANTIATION_ERROR, t, "alarm/2");
return(FALSE);
}
if (!IsIntegerTerm(t)) {
Error(TYPE_ERROR_INTEGER, t, "alarm/2");
return(FALSE);
}
#if _MSC_VER || defined(__MINGW32__)
{
Term tout;
HANDLE htimer = CreateWaitableTimer(NULL,FALSE,NULL);
LARGE_INTEGER due_time;
__int64 timeout = -IntegerOfTerm(t);
due_time.QuadPart = timeout;
if (SetWaitableTimer(htimer, &due_time,0,HandleTimer,NULL,TRUE) == 0) {
Error(SYSTEM_ERROR, TermNil,
"alarm not available in this configuration");
return(FALSE);
}
tout = MkIntegerTerm(0);
return(unify(ARG2,tout));
}
#elif HAVE_ALARM
{
Int left;
Term tout;
left = alarm(IntOfTerm(t));
tout = MkIntegerTerm(left);
return(unify(ARG2,tout));
}
#else
Error(SYSTEM_ERROR, TermNil,
"alarm not available in this configuration");
return(FALSE);
#endif
}
#if HAVE_FPU_CONTROL_H
#include <fpu_control.h>
#endif
/* by default Linux with glibc is IEEE compliant anyway..., but we will pretend it is not. */
void
set_fpu_exceptions(int flag)
{
if (flag) {
#if defined(__hpux)
fpsetmask(FP_X_INV|FP_X_DZ|FP_X_OFL|FP_X_UFL);
#endif
#if HAVE_FPU_CONTROL_H && i386 && FIX_CONFIGURE
/* 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
} else {
/* do IEEE arithmetic in the way the big boys do */
#if defined(__hpux)
fpsetmask(FP_X_CLEAR);
#endif
#if HAVE_FPU_CONTROL_H && i386 && FIX_CONFIGURE
/* this will probably not work in older releases of Linux */
int v = _FPU_IEEE;
_FPU_SETCW(v);
#endif
}
}
/*
* This is responsable for the initialization of all machine dependant
* predicates
*/
void
InitSysbits (void)
{
InitPageSize();
InitTime ();
InitWTime ();
InitRandom ();
/* let the caller control signals as it sees fit */
InitSignals ();
}
void
ReInitWallTime (void)
{
InitWTime();
if (heap_regs->last_wtime != NULL)
FreeCodeSpace(heap_regs->last_wtime);
InitLastWtime();
}
void
InitSysPreds(void)
{
/* can only do after heap is initialised */
InitLastWtime();
InitCPred ("srandom", 1, p_srandom, SafePredFlag);
InitCPred ("sh", 0, p_sh, SafePredFlag|SyncPredFlag);
InitCPred ("$shell", 1, p_shell, SafePredFlag|SyncPredFlag);
InitCPred ("$system", 1, p_system, SafePredFlag|SyncPredFlag);
InitCPred ("$rename", 2, p_mv, SafePredFlag|SyncPredFlag);
InitCPred ("$cd", 1, p_cd, SafePredFlag|SyncPredFlag);
InitCPred ("$getcwd", 1, p_getcwd, SafePredFlag|SyncPredFlag);
InitCPred ("$dir_separator", 1, p_dir_sp, SafePredFlag);
InitCPred ("$alarm", 2, p_alarm, SafePredFlag|SyncPredFlag);
InitCPred ("$getenv", 2, p_getenv, SafePredFlag);
InitCPred ("$putenv", 2, p_putenv, SafePredFlag|SyncPredFlag);
}
#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
#ifdef _WIN32
int WINAPI STD_PROTO(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
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