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0f2400b1f8feec31180f41abf5288d6f078fbc85
yap-6.3/packages/PLStream/pl-os.c
Vitor Santos Costa 4a53759fc1 update PLStream to more recent version of SWI.
2010-02-22 09:35:47 +00:00

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/* $Id$
Part of SWI-Prolog
Author: Jan Wielemaker
E-mail: wielemak@science.uva.nl
WWW: http://www.swi-prolog.org
Copyright (C): 1985-2007, University of Amsterdam
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/* Modified (M) 1993 Dave Sherratt */
/*#define O_DEBUG 1*/
#if OS2 && EMX
#include <os2.h> /* this has to appear before pl-incl.h */
#endif
#include "pl-incl.h"
#include "pl-ctype.h"
#include "pl-utf8.h"
#undef abs
#include <math.h> /* avoid abs() problem with msvc++ */
#include <stdio.h> /* rename() and remove() prototypes */
#if HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#if !O_XOS
#define statfunc stat
#endif
#if HAVE_PWD_H
#include <pwd.h>
#endif
#if HAVE_VFORK_H
#include <vfork.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_SYS_FILE_H
#include <sys/file.h>
#endif
#if defined(HAVE_SYS_RESOURCE_H)
#include <sys/resource.h>
#endif
#ifdef HAVE_FTIME
#include <sys/timeb.h>
#endif
#include <time.h>
#include <fcntl.h>
#ifndef __WATCOMC__ /* appears a conflict */
#include <errno.h>
#endif
#if defined(__WATCOMC__)
#include <io.h>
#include <dos.h>
#endif
#if OS2 && EMX
static double initial_time;
#endif /* OS2 */
#define LOCK() PL_LOCK(L_OS)
#define UNLOCK() PL_UNLOCK(L_OS)
static void initExpand(void);
static void cleanupExpand(void);
static void initEnviron(void);
static char * Which(const char *program, char *fullname);
#ifndef DEFAULT_PATH
#define DEFAULT_PATH "/bin:/usr/bin"
#endif
/*******************************
* GLOBALS *
*******************************/
#ifdef HAVE_CLOCK
long clock_wait_ticks;
#endif
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
This module is a contraction of functions that used to be all over the
place. together with pl-os.h (included by pl-incl.h) this file
should define a basic layer around the OS, on which the rest of
SWI-Prolog is based. SWI-Prolog has been developed on SUN, running
SunOs 3.4 and later 4.0.
Unfortunately some OS's simply do not offer an equivalent to SUN os
features. In most cases part of the functionality of the system will
have to be dropped. See the header of pl-incl.h for details.
- - - - - - - - - - - - - - - - */
/********************************
* INITIALISATION *
*********************************/
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
bool initOs()
Initialise the OS dependant functions.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
bool
initOs(void)
{ GET_LD
DEBUG(1, Sdprintf("OS:initExpand() ...\n"));
initExpand();
DEBUG(1, Sdprintf("OS:initEnviron() ...\n"));
initEnviron();
#ifdef __WINDOWS__
setPrologFlagMask(PLFLAG_FILE_CASE_PRESERVING);
#else
setPrologFlagMask(PLFLAG_FILE_CASE);
setPrologFlagMask(PLFLAG_FILE_CASE_PRESERVING);
#endif
#ifdef HAVE_CLOCK
clock_wait_ticks = 0L;
#endif
#if OS2
{ DATETIME i;
DosGetDateTime((PDATETIME)&i);
initial_time = (i.hours * 3600.0)
+ (i.minutes * 60.0)
+ i.seconds
+ (i.hundredths / 100.0);
}
#endif /* OS2 */
DEBUG(1, Sdprintf("OS:done\n"));
succeed;
}
void
cleanupOs(void)
{ cleanupExpand();
}
/********************************
* OS ERRORS *
*********************************/
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
char *OsError()
Return a char *, holding a description of the last OS call error.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
char *
OsError(void)
{
#ifdef HAVE_STRERROR
#ifdef __WINDOWS__
return strerror(_xos_errno());
#else
return strerror(errno);
#endif
#else /*HAVE_STRERROR*/
static char errmsg[64];
#ifdef __unix__
extern int sys_nerr;
#if !EMX
extern char *sys_errlist[];
#endif
extern int errno;
if ( errno < sys_nerr )
return sys_errlist[errno];
#endif
Ssprintf(errmsg, "Unknown Error (%d)", errno);
return errmsg;
#endif /*HAVE_STRERROR*/
}
/********************************
* PROCESS CHARACTERISTICS *
*********************************/
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
double CpuTime(cputime_kind)
Returns a floating point number, representing the amount of (user)
CPU-seconds used by the process Prolog is in. For systems that do
not allow you to obtain this information you may wish to return
elapsed time since Prolog was started, as this function is used to
by consult/1 and time/1 to determine the amount of CPU time used to
consult a file or to execute a query.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
#ifndef __WINDOWS__ /* defined in pl-nt.c */
#ifdef HAVE_TIMES
#include <sys/times.h>
#if defined(_SC_CLK_TCK)
#define Hz ((int)sysconf(_SC_CLK_TCK))
#else
#ifdef HZ
# define Hz HZ
#else
# define Hz 60 /* if nothing better: guess */
#endif
#endif /*_SC_CLK_TCK*/
#endif /*HAVE_TIMES*/
double
CpuTime(cputime_kind which)
{
#ifdef HAVE_TIMES
struct tms t;
double used;
static int MTOK_got_hz = FALSE;
static double MTOK_hz;
if ( !MTOK_got_hz )
{ MTOK_hz = (double) Hz;
MTOK_got_hz++;
}
times(&t);
switch( which )
{ case CPU_USER:
used = (double) t.tms_utime / MTOK_hz;
break;
case CPU_SYSTEM:
default: /* make compiler happy */
used = (double) t.tms_stime / MTOK_hz;
}
if ( isnan(used) ) /* very dubious, but this */
used = 0.0; /* happens when running under GDB */
return used;
#else
#if OS2 && EMX
DATETIME i;
DosGetDateTime((PDATETIME)&i);
return (((i.hours * 3600)
+ (i.minutes * 60)
+ i.seconds
+ (i.hundredths / 100.0)) - initial_time);
#else
#ifdef HAVE_CLOCK
return (double) (clock() - clock_wait_ticks) / (double) CLOCKS_PER_SEC;
#else
return 0.0;
#endif
#endif
#endif
}
#endif /*__WINDOWS__*/
void
PL_clock_wait_ticks(long waited)
{
#ifdef HAVE_CLOCK
clock_wait_ticks += waited;
#endif
}
double
WallTime(void)
{ double stime;
#if HAVE_CLOCK_GETTIME
struct timespec tp;
clock_gettime(CLOCK_REALTIME, &tp);
stime = (double)tp.tv_sec + (double)tp.tv_nsec/1000000000.0;
#else
#ifdef HAVE_GETTIMEOFDAY
struct timeval tp;
gettimeofday(&tp, NULL);
stime = (double)tp.tv_sec + (double)tp.tv_usec/1000000.0;
#else
#ifdef HAVE_FTIME
struct timeb tb;
ftime(&tb);
stime = (double)tb.time + (double)tb.millitm/1000.0;
#else
stime = (double)time((time_t *)NULL);
#endif
#endif
#endif
return stime;
}
/*******************************
* FEATURES *
*******************************/
#ifndef __WINDOWS__ /* Windows version in pl-nt.c */
#ifdef HAVE_SC_NPROCESSORS_CONF
static int
CpuCount()
{
return sysconf(_SC_NPROCESSORS_CONF);
}
#else
#ifdef PROCFS_CPUINFO
static int
CpuCount()
{ FILE *fd = fopen("/proc/cpuinfo", "r");
if ( fd )
{ char buf[256];
int count = 0;
while(fgets(buf, sizeof(buf)-1, fd))
{ char *vp;
if ( (vp = strchr(buf, ':')) )
{ char *en;
for(en=vp; en > buf && en[-1] <= ' '; en--)
;
*en = EOS;
DEBUG(2, Sdprintf("Got %s = %s\n", buf, vp+2));
if ( streq("processor", buf) && isDigit(vp[2]) )
{ int cpu = atoi(vp+2);
if ( cpu+1 > count )
count = cpu+1;
}
}
}
fclose(fd);
return count;
}
return 0;
}
#else /*PROCFS_CPUINFO*/
#ifdef HAVE_SYSCTLBYNAME /* MacOS X */
#include <sys/param.h>
#include <sys/sysctl.h>
int
CpuCount()
{ int count ;
size_t size=sizeof(count) ;
if ( sysctlbyname("hw.ncpu", &count, &size, NULL, 0) )
return 0;
return count;
}
#else
#define CpuCount() 0
#endif /*sysctlbyname*/
#endif /*PROCFS_CPUINFO*/
#endif /*HAVE_SC_NPROCESSORS_CONF*/
void
setOSPrologFlags(void)
{ int cpu_count = CpuCount();
if ( cpu_count > 0 )
PL_set_prolog_flag("cpu_count", PL_INTEGER|FF_READONLY, cpu_count);
}
#endif
/*******************************
* MEMORY *
*******************************/
uintptr_t
UsedMemory(void)
{ GET_LD
#if defined(HAVE_GETRUSAGE) && defined(HAVE_RU_IDRSS)
struct rusage usage;
if ( getrusage(RUSAGE_SELF, &usage) == 0 &&
usage.ru_idrss )
{ return usage.ru_idrss; /* total unshared data */
}
#endif
return (GD->statistics.heap +
usedStack(global) +
usedStack(local) +
usedStack(trail));
}
uintptr_t
FreeMemory(void)
{
#if defined(HAVE_GETRLIMIT) && defined(RLIMIT_DATA)
uintptr_t used = UsedMemory();
struct rlimit limit;
if ( getrlimit(RLIMIT_DATA, &limit) == 0 )
return limit.rlim_cur - used;
#endif
return 0L;
}
/********************************
* ARITHMETIC *
*********************************/
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
uint64_t _PL_Random()
Return a random number. Used for arithmetic only. More trouble. On
some systems (__WINDOWS__) the seed of rand() is thread-local, while on
others it is global. We appear to have the choice between
# srand()/rand()
Differ in MT handling, often bad distribution
# srandom()/random()
Not portable, not MT-Safe but much better distribution
# drand48() and friends
Depreciated according to Linux manpage, suggested by Solaris
manpage.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
#ifdef __MINGW32__
__stdcall unsigned long GetTickCount(void);
#endif
void
setRandom(unsigned int *seedp)
{ unsigned int seed;
if ( seedp )
{ seed = *seedp;
} else
{
#ifdef __WINDOWS__
seed = (unsigned int)GetTickCount();
#else
#ifdef HAVE_GETTIMEOFDAY
struct timeval tp;
gettimeofday(&tp, NULL);
seed = (unsigned int)(tp.tv_sec + tp.tv_usec);
#else
seed = (unsigned int)time((time_t *) NULL);
#endif
#endif
}
#ifdef HAVE_SRANDOM
srandom(seed);
#else
#ifdef HAVE_SRAND
srand(seed);
#endif
#endif
}
uint64_t
_PL_Random(void)
{ GET_LD
if ( !LD->os.rand_initialised )
{ setRandom(NULL);
LD->os.rand_initialised = TRUE;
}
#ifdef HAVE_RANDOM
#if SIZEOF_VOIDP == 4
{ uint64_t l = random();
l ^= (uint64_t)random()<<32;
return l;
}
#else
return random();
#endif
#else
{ uint64_t l = rand(); /* 0<n<2^15-1 */
l ^= (uint64_t)rand()<<15;
l ^= (uint64_t)rand()<<30;
l ^= (uint64_t)rand()<<45;
return l;
}
#endif
}
/********************************
* FILES *
*********************************/
/* (Everything you always wanted to know about files ...) */
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Generation and administration of temporary files. Currently only used
by the foreign language linker. It might be useful to make a predicate
available to the Prolog user based on these functions. These functions
are in this module as non-UNIX OS probably don't have getpid() or put
temporaries on /tmp.
atom_t TemporaryFile(const char *id, int *fdp)
The return value of this call is an atom, whose string represents
the path name of a unique file that can be used as temporary file.
`id' is a char * that can be used to make it easier to identify the
file as a specific kind of SWI-Prolog intermediate file.
void RemoveTemporaryFiles()
Remove all temporary files. This function should be aware of the
fact that some of the file names generated by TemporaryFile() might
not be created at all, or might already have been deleted.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
#ifndef DEFTMPDIR
#ifdef __WINDOWS__
#define DEFTMPDIR "c:/tmp"
#else
#define DEFTMPDIR "/tmp"
#endif
#endif
static int
free_tmp_symbol(Symbol s)
{ int rc;
atom_t tname = (atom_t)s->name;
PL_chars_t txt;
get_atom_text(tname, &txt);
PL_mb_text(&txt, REP_FN);
rc = RemoveFile(txt.text.t);
PL_free_text(&txt);
PL_unregister_atom(tname);
return rc;
}
static void
void_free_tmp_symbol(Symbol s)
{ (void)free_tmp_symbol(s);
}
#ifndef O_EXCL
#define O_EXCL 0
#endif
#ifndef O_BINARY
#define O_BINARY 0
#endif
atom_t
TemporaryFile(const char *id, int *fdp)
{ char temp[MAXPATHLEN];
static char *tmpdir = NULL;
atom_t tname;
int retries = 0;
if ( !tmpdir )
{ LOCK();
if ( !tmpdir )
{ char envbuf[MAXPATHLEN];
char *td;
if ( (td = Getenv("TEMP", envbuf, sizeof(envbuf))) ||
(td = Getenv("TMP", envbuf, sizeof(envbuf))) )
tmpdir = strdup(td);
else
tmpdir = DEFTMPDIR;
}
UNLOCK();
}
retry:
#ifdef __unix__
{ static int MTOK_temp_counter = 0;
const char *sep = id[0] ? "_" : "";
Ssprintf(temp, "%s/pl_%s%s%d_%d",
tmpdir, id, sep, (int) getpid(), MTOK_temp_counter++);
}
#endif
#ifdef __WINDOWS__
{ char *tmp;
static int temp_counter = 0;
#ifdef __LCC__
if ( (tmp = tmpnam(NULL)) )
#else
if ( (tmp = _tempnam(tmpdir, id)) )
#endif
{ PrologPath(tmp, temp, sizeof(temp));
} else
{ const char *sep = id[0] ? "_" : "";
Ssprintf(temp, "%s/pl_%s%s%d", tmpdir, id, sep, temp_counter++);
}
}
#endif
if ( fdp )
{ int fd;
if ( (fd=open(temp, O_CREAT|O_EXCL|O_WRONLY|O_BINARY, 0600)) < 0 )
{ if ( ++retries < 10000 )
goto retry;
else
return NULL_ATOM;
}
*fdp = fd;
}
tname = PL_new_atom(temp); /* locked: ok! */
LOCK();
if ( !GD->os.tmp_files )
{ GD->os.tmp_files = newHTable(4);
GD->os.tmp_files->free_symbol = void_free_tmp_symbol;
}
UNLOCK();
addHTable(GD->os.tmp_files, (void*)tname, (void*)TRUE);
return tname;
}
int
DeleteTemporaryFile(atom_t name)
{ int rc = FALSE;
if ( GD->os.tmp_files )
{ LOCK();
if ( GD->os.tmp_files && GD->os.tmp_files->size > 0 )
{ Symbol s = lookupHTable(GD->os.tmp_files, (void*)name);
if ( s )
{ rc = free_tmp_symbol(s);
deleteSymbolHTable(GD->os.tmp_files, s);
}
}
UNLOCK();
}
return rc;
}
void
RemoveTemporaryFiles(void)
{ LOCK();
if ( GD->os.tmp_files )
{ Table t = GD->os.tmp_files;
GD->os.tmp_files = NULL;
UNLOCK();
destroyHTable(t);
} else
{ UNLOCK();
}
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Size of a VM page of memory. Most BSD machines have this function. If not,
here are several alternatives ...
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
#ifndef HAVE_GETPAGESIZE
#ifdef _SC_PAGESIZE
int
getpagesize()
{ return sysconf(_SC_PAGESIZE);
}
#else /*_SC_PAGESIZE*/
#if hpux
#include <a.out.h>
int
getpagesize()
{
#ifdef EXEC_PAGESIZE
return EXEC_PAGESIZE;
#else
return 4096; /* not that important */
#endif
}
#endif /*hpux*/
#endif /*_SC_PAGESIZE*/
#endif /*HAVE_GETPAGESIZE*/
#if O_HPFS
/* Conversion rules Prolog <-> OS/2 (using HPFS)
/ <-> \
/x:/ <-> x:\ (embedded drive letter)
No length restrictions up to MAXPATHLEN, no case conversions.
*/
char *
PrologPath(char *ospath, char *path, size_t len)
{ char *s = ospath, *p = path;
int limit = len-1;
if (isLetter(s[0]) && s[1] == ':')
{ *p++ = '/';
*p++ = *s++;
*p++ = *s++;
limit -= 3;
}
for(; *s && limit; s++, p++, limit--)
*p = (*s == '\\' ? '/' : makeLower(*s));
*p = EOS;
return path;
}
char *
OsPath(const char *plpath, char *path)
{ const char *s = plpath, *p = path;
int limit = MAXPATHLEN-1;
if ( s[0] == '/' && isLetter(s[1]) && s[2] == ':') /* embedded drive letter*/
{ s++;
*p++ = *s++;
*p++ = *s++;
if ( *s != '/' )
*p++ = '\\';
limit -= 2;
}
for(; *s && limit; s++, p++, limit--)
*p = (*s == '/' ? '\\' : *s);
if ( p[-1] == '\\' && p > path )
p--;
*p = EOS;
return path;
}
#endif /* O_HPFS */
#ifdef __unix__
char *
PrologPath(const char *p, char *buf, size_t len)
{ strncpy(buf, p, len);
return buf;
}
char *
OsPath(const char *p, char *buf)
{ strcpy(buf, p);
return buf;
}
#endif /*__unix__*/
#if O_XOS
char *
PrologPath(const char *p, char *buf, size_t len)
{ GET_LD
int flags = (truePrologFlag(PLFLAG_FILE_CASE) ? 0 : XOS_DOWNCASE);
return _xos_canonical_filename(p, buf, len, flags);
}
char *
OsPath(const char *p, char *buf)
{ strcpy(buf, p);
return buf;
}
#endif /* O_XOS */
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
char *AbsoluteFile(const char *file, char *path)
Expand a file specification to a system-wide unique description of
the file that can be passed to the file functions that take a path
as argument. Path should refer to the same file, regardless of the
current working directory. On Unix absolute file names are used
for this purpose.
This function is based on a similar (primitive) function in
Edinburgh C-Prolog.
char *BaseName(path)
char *path;
Return the basic file name for a file having path `path'.
char *DirName(const char *path, char *dir)
Return the directory name for a file having path `path'.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
#if defined(HAVE_SYMLINKS) && (defined(HAVE_STAT) || defined(__unix__))
#define O_CANONISE_DIRS
struct canonical_dir
{ char * name; /* name of directory */
char * canonical; /* canonical name of directory */
dev_t device; /* device number */
ino_t inode; /* inode number */
CanonicalDir next; /* next in chain */
};
#define canonical_dirlist (GD->os._canonical_dirlist)
forwards char *canoniseDir(char *);
#endif /*O_CANONISE_DIRS*/
#define CWDdir (LD->os._CWDdir) /* current directory */
#define CWDlen (LD->os._CWDlen) /* strlen(CWDdir) */
static void
initExpand(void)
{ GET_LD
#ifdef O_CANONISE_DIRS
char *dir;
char *cpaths;
#endif
CWDdir = NULL;
CWDlen = 0;
#ifdef O_CANONISE_DIRS
{ char envbuf[MAXPATHLEN];
if ( (cpaths = Getenv("CANONICAL_PATHS", envbuf, sizeof(envbuf))) )
{ char buf[MAXPATHLEN];
while(*cpaths)
{ char *e;
if ( (e = strchr(cpaths, ':')) )
{ int l = e-cpaths;
strncpy(buf, cpaths, l);
buf[l] = EOS;
cpaths += l+1;
canoniseDir(buf);
} else
{ canoniseDir(cpaths);
break;
}
}
}
if ( (dir = Getenv("HOME", envbuf, sizeof(envbuf))) ) canoniseDir(dir);
if ( (dir = Getenv("PWD", envbuf, sizeof(envbuf))) ) canoniseDir(dir);
if ( (dir = Getenv("CWD", envbuf, sizeof(envbuf))) ) canoniseDir(dir);
}
#endif
}
#ifdef O_CANONISE_DIRS
static void
cleanupExpand(void)
{ CanonicalDir dn = canonical_dirlist, next;
canonical_dirlist = NULL;
for( ; dn; dn = next )
{ next = dn->next;
free(dn);
}
}
static void
registerParentDirs(const char *path)
{ const char *e = path + strlen(path);
while(e>path)
{ char dirname[MAXPATHLEN];
char tmp[MAXPATHLEN];
CanonicalDir d;
struct stat buf;
for(e--; *e != '/' && e > path + 1; e-- )
;
strncpy(dirname, path, e-path);
dirname[e-path] = EOS;
for(d = canonical_dirlist; d; d = d->next)
{ if ( streq(d->name, dirname) )
return;
}
if ( statfunc(OsPath(dirname, tmp), &buf) == 0 )
{ CanonicalDir dn = malloc(sizeof(*dn));
dn->name = store_string(dirname);
dn->inode = buf.st_ino;
dn->device = buf.st_dev;
dn->canonical = dn->name;
dn->next = canonical_dirlist;
canonical_dirlist = dn;
DEBUG(1, Sdprintf("Registered canonical dir %s\n", dirname));
} else
return;
}
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
verify_entry() verifies the path cache for this path is still safe. If
not it updates the cache and returns FALSE.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
static int
verify_entry(CanonicalDir d)
{ char tmp[MAXPATHLEN];
struct stat buf;
if ( statfunc(OsPath(d->canonical, tmp), &buf) == 0 )
{ if ( d->inode == buf.st_ino &&
d->device == buf.st_dev )
return TRUE;
DEBUG(1, Sdprintf("%s: inode/device changed\n", d->canonical));
d->inode = buf.st_ino;
d->device = buf.st_dev;
return TRUE;
} else
{ DEBUG(1, Sdprintf("%s: no longer exists\n", d->canonical));
if ( d == canonical_dirlist )
{ canonical_dirlist = d->next;
} else
{ CanonicalDir cd;
for(cd=canonical_dirlist; cd; cd=cd->next)
{ if ( cd->next == d )
{ cd->next = d->next;
break;
}
}
}
remove_string(d->name);
if ( d->canonical != d->name )
remove_string(d->canonical);
free(d);
}
return FALSE;
}
static char *
canoniseDir(char *path)
{ CanonicalDir d, next;
struct stat buf;
char tmp[MAXPATHLEN];
DEBUG(1, Sdprintf("canoniseDir(%s) --> ", path));
for(d = canonical_dirlist; d; d = next)
{ next = d->next;
if ( streq(d->name, path) && verify_entry(d) )
{ if ( d->name != d->canonical )
strcpy(path, d->canonical);
DEBUG(1, Sdprintf("(lookup) %s\n", path));
return path;
}
}
/* we need to use malloc() here */
/* because allocHeap() only ensures */
/* alignment for `word', and inode_t */
/* is sometimes bigger! */
if ( statfunc(OsPath(path, tmp), &buf) == 0 )
{ CanonicalDir dn = malloc(sizeof(*dn));
char dirname[MAXPATHLEN];
char *e = path + strlen(path);
dn->name = store_string(path);
dn->inode = buf.st_ino;
dn->device = buf.st_dev;
do
{ strncpy(dirname, path, e-path);
dirname[e-path] = EOS;
if ( statfunc(OsPath(dirname, tmp), &buf) < 0 )
break;
DEBUG(2, Sdprintf("Checking %s (dev=%d,ino=%d)\n",
dirname, buf.st_dev, buf.st_ino));
for(d = canonical_dirlist; d; d = next)
{ next = d->next;
if ( d->inode == buf.st_ino && d->device == buf.st_dev &&
verify_entry(d) )
{ DEBUG(2, Sdprintf("Hit with %s (dev=%d,ino=%d)\n",
d->canonical, d->device, d->inode));
strcpy(dirname, d->canonical);
strcat(dirname, e);
strcpy(path, dirname);
dn->canonical = store_string(path);
dn->next = canonical_dirlist;
canonical_dirlist = dn;
DEBUG(1, Sdprintf("(replace) %s\n", path));
registerParentDirs(path);
return path;
}
}
for(e--; *e != '/' && e > path + 1; e-- )
;
} while( e > path );
dn->canonical = dn->name;
dn->next = canonical_dirlist;
canonical_dirlist = dn;
DEBUG(1, Sdprintf("(new, existing) %s\n", path));
registerParentDirs(path);
return path;
}
DEBUG(1, Sdprintf("(nonexisting) %s\n", path));
return path;
}
#else
#define canoniseDir(d)
static void
cleanupExpand(void)
{
}
#endif /*O_CANONISE_DIRS*/
char *
canoniseFileName(char *path)
{ char *out = path, *in = path, *start = path;
char *osave[100];
int osavep = 0;
#ifdef O_HASDRIVES /* C: */
if ( in[1] == ':' && isLetter(in[0]) )
{ in += 2;
out = start = in;
}
#endif
#ifdef O_HASSHARES /* //host/ */
if ( in[0] == '/' && in[1] == '/' && isAlpha(in[2]) )
{ char *s;
for(s = in+3; *s && (isAlpha(*s) || *s == '.'); s++)
;
if ( *s == '/' )
{ in = out = s+1;
start = in-1;
}
}
#endif
while( in[0] == '/' && in[1] == '.' && in[2] == '.' && in[3] == '/' )
in += 3;
while( in[0] == '.' && in[1] == '/' )
in += 2;
if ( in[0] == '/' )
*out++ = '/';
osave[osavep++] = out;
while(*in)
{ if (*in == '/')
{
again:
if ( *in )
{ while( in[1] == '/' ) /* delete multiple / */
in++;
if ( in[1] == '.' )
{ if ( in[2] == '/' ) /* delete /./ */
{ in += 2;
goto again;
}
if ( in[2] == EOS ) /* delete trailing /. */
{ *out = EOS;
return path;
}
if ( in[2] == '.' && (in[3] == '/' || in[3] == EOS) )
{ if ( osavep > 0 ) /* delete /foo/../ */
{ out = osave[--osavep];
in += 3;
if ( in[0] == EOS && out > start+1 )
{ out[-1] = EOS; /* delete trailing / */
return path;
}
goto again;
} else if ( start[0] == '/' && out == start+1 )
{ in += 3;
goto again;
}
}
}
}
if ( *in )
in++;
if ( out > path && out[-1] != '/' )
*out++ = '/';
osave[osavep++] = out;
} else
*out++ = *in++;
}
*out++ = *in++;
return path;
}
static char *
utf8_strlwr(char *s)
{ char tmp[MAXPATHLEN];
char *o, *i;
strcpy(tmp, s);
for(i=tmp, o=s; *i; )
{ int c;
i = utf8_get_char(i, &c);
c = towlower((wint_t)c);
o = utf8_put_char(o, c);
}
*o = EOS;
return s;
}
char *
canonisePath(char *path)
{ GET_LD
if ( !truePrologFlag(PLFLAG_FILE_CASE) )
utf8_strlwr(path);
canoniseFileName(path);
#ifdef O_CANONISE_DIRS
{ char *e;
char dirname[MAXPATHLEN];
e = path + strlen(path) - 1;
for( ; *e != '/' && e > path; e-- )
;
strncpy(dirname, path, e-path);
dirname[e-path] = EOS;
canoniseDir(dirname);
strcat(dirname, e);
strcpy(path, dirname);
}
#endif
return path;
}
static char *
takeWord(const char **string, char *wrd, int maxlen)
{ const char *s = *string;
char *q = wrd;
int left = maxlen-1;
while( isAlpha(*s) || *s == '_' )
{ if ( --left < 0 )
{ PL_error(NULL, 0, NULL, ERR_REPRESENTATION,
ATOM_max_variable_length);
return NULL;
}
*q++ = *s++;
}
*q = EOS;
*string = s;
return wrd;
}
bool
expandVars(const char *pattern, char *expanded, int maxlen)
{ GET_LD
int size = 0;
char wordbuf[MAXPATHLEN];
if ( *pattern == '~' )
{ char *user;
char *value;
int l;
pattern++;
user = takeWord(&pattern, wordbuf, sizeof(wordbuf));
LOCK();
if ( user[0] == EOS ) /* ~/bla */
{
#ifdef O_XOS
value = _xos_home();
#else /*O_XOS*/
if ( !(value = GD->os.myhome) )
{ char envbuf[MAXPATHLEN];
if ( (value = Getenv("HOME", envbuf, sizeof(envbuf))) &&
(value = PrologPath(value, wordbuf, sizeof(wordbuf))) )
{ GD->os.myhome = store_string(value);
} else
{ value = GD->os.myhome = store_string("/");
}
}
#endif /*O_XOS*/
} else /* ~fred */
#ifdef HAVE_GETPWNAM
{ struct passwd *pwent;
if ( GD->os.fred && streq(GD->os.fred, user) )
{ value = GD->os.fredshome;
} else
{ if ( !(pwent = getpwnam(user)) )
{ if ( truePrologFlag(PLFLAG_FILEERRORS) )
{ term_t name = PL_new_term_ref();
PL_put_atom_chars(name, user);
PL_error(NULL, 0, NULL, ERR_EXISTENCE, ATOM_user, name);
}
UNLOCK();
fail;
}
if ( GD->os.fred )
remove_string(GD->os.fred);
if ( GD->os.fredshome )
remove_string(GD->os.fredshome);
GD->os.fred = store_string(user);
value = GD->os.fredshome = store_string(pwent->pw_dir);
}
}
#else
{ if ( truePrologFlag(PLFLAG_FILEERRORS) )
PL_error(NULL, 0, NULL, ERR_NOT_IMPLEMENTED, "user_info");
UNLOCK();
fail;
}
#endif
size += (l = (int) strlen(value));
if ( size+1 >= maxlen )
return PL_error(NULL, 0, NULL, ERR_REPRESENTATION, ATOM_max_path_length);
strcpy(expanded, value);
expanded += l;
UNLOCK();
/* ~/ should not become // */
if ( expanded[-1] == '/' && pattern[0] == '/' )
pattern++;
}
for( ;; )
{ int c = *pattern++;
switch( c )
{ case EOS:
break;
case '$':
{ char envbuf[MAXPATHLEN];
char *var = takeWord(&pattern, wordbuf, sizeof(wordbuf));
char *value;
int l;
if ( var[0] == EOS )
goto def;
LOCK();
value = Getenv(var, envbuf, sizeof(envbuf));
if ( value == (char *) NULL )
{ if ( truePrologFlag(PLFLAG_FILEERRORS) )
{ term_t name = PL_new_term_ref();
PL_put_atom_chars(name, var);
PL_error(NULL, 0, NULL, ERR_EXISTENCE, ATOM_variable, name);
}
UNLOCK();
fail;
}
size += (l = (int)strlen(value));
if ( size+1 >= maxlen )
{ UNLOCK();
return PL_error(NULL, 0, NULL, ERR_REPRESENTATION,
ATOM_max_path_length);
}
strcpy(expanded, value);
UNLOCK();
expanded += l;
continue;
}
default:
def:
size++;
if ( size+1 >= maxlen )
return PL_error(NULL, 0, NULL, ERR_REPRESENTATION,
ATOM_max_path_length);
*expanded++ = c;
continue;
}
break;
}
if ( ++size >= maxlen )
return PL_error(NULL, 0, NULL, ERR_REPRESENTATION,
ATOM_max_path_length);
*expanded = EOS;
succeed;
}
static int
ExpandFile(const char *pattern, char **vector)
{ char expanded[MAXPATHLEN];
int matches = 0;
if ( !expandVars(pattern, expanded, sizeof(expanded)) )
return -1;
vector[matches++] = store_string(expanded);
return matches;
}
char *
ExpandOneFile(const char *spec, char *file)
{ GET_LD
char *vector[256];
int size;
switch( (size=ExpandFile(spec, vector)) )
{ case -1:
return NULL;
case 0:
{ term_t tmp = PL_new_term_ref();
PL_put_atom_chars(tmp, spec);
PL_error(NULL, 0, "no match", ERR_EXISTENCE, ATOM_file, tmp);
return NULL;
}
case 1:
strcpy(file, vector[0]);
remove_string(vector[0]);
return file;
default:
{ term_t tmp = PL_new_term_ref();
int n;
for(n=0; n<size; n++)
remove_string(vector[n]);
PL_put_atom_chars(tmp, spec);
PL_error(NULL, 0, "ambiguous", ERR_EXISTENCE, ATOM_file, tmp);
return NULL;
}
}
}
#ifdef O_HASDRIVES
#define IS_DIR_SEPARATOR(c) ((c) == '/' || (c) == '\\')
int
IsAbsolutePath(const char *p) /* /d:/ */
{ if ( p[0] == '/' && p[2] == ':' && isLetter(p[1]) &&
(p[3] == '/' || p[3] == '\0') )
succeed;
if ( p[1] == ':' && isLetter(p[0]) && /* d:/ or d:\ */
(IS_DIR_SEPARATOR(p[2]) || p[2] == '\0') )
succeed;
#ifdef O_HASSHARES
if ( (p[0] == '/' && p[1] == '/') || /* //host/share */
(p[0] == '\\' && p[1] == '\\') ) /* \\host\share */
succeed;
#endif
fail;
}
static inline int
isDriveRelativePath(const char *p) /* '/...' */
{ return IS_DIR_SEPARATOR(p[0]) && !IsAbsolutePath(p);
}
#ifdef __WINDOWS__
#undef mkdir
#include <direct.h>
#define mkdir _xos_mkdir
#endif
static int
GetCurrentDriveLetter()
{
#ifdef OS2
return _getdrive();
#endif
#ifdef __WINDOWS__
return _getdrive() + 'a' - 1;
#endif
#ifdef __WATCOMC__
{ unsigned drive;
_dos_getdrive(&drive);
return = 'a' + drive - 1;
}
#endif
}
#else /*O_HASDRIVES*/
int
IsAbsolutePath(const char *p)
{ return p[0] == '/';
}
#endif /*O_HASDRIVES*/
#define isRelativePath(p) ( p[0] == '.' )
char *
AbsoluteFile(const char *spec, char *path)
{ GET_LD
char tmp[MAXPATHLEN];
char buf[MAXPATHLEN];
char *file = PrologPath(spec, buf, sizeof(buf));
if ( !file )
return (char *) NULL;
if ( truePrologFlag(PLFLAG_FILEVARS) )
{ if ( !(file = ExpandOneFile(buf, tmp)) )
return (char *) NULL;
}
if ( IsAbsolutePath(file) )
{ strcpy(path, file);
return canonisePath(path);
}
#ifdef O_HASDRIVES
if ( isDriveRelativePath(file) ) /* /something --> d:/something */
{ if ((strlen(file) + 3) > MAXPATHLEN)
{ PL_error(NULL, 0, NULL, ERR_REPRESENTATION, ATOM_max_path_length);
return (char *) NULL;
}
path[0] = GetCurrentDriveLetter();
path[1] = ':';
strcpy(&path[2], file);
return canonisePath(path);
}
#endif /*O_HASDRIVES*/
if ( !PL_cwd() )
return NULL;
if ( (CWDlen + strlen(file) + 1) >= MAXPATHLEN )
{ PL_error(NULL, 0, NULL, ERR_REPRESENTATION, ATOM_max_path_length);
return (char *) NULL;
}
strcpy(path, CWDdir);
if ( file[0] != EOS )
strcpy(&path[CWDlen], file);
if ( strchr(file, '.') || strchr(file, '/') )
return canonisePath(path);
else
return path;
}
void
PL_changed_cwd(void)
{ GET_LD
if ( CWDdir )
remove_string(CWDdir);
CWDdir = NULL;
CWDlen = 0;
}
const char *
PL_cwd(void)
{ GET_LD
if ( CWDlen == 0 )
{ char buf[MAXPATHLEN];
char *rval;
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
On SunOs, getcwd() is using popen() to read the output of /bin/pwd. This
is slow and appears not to cooperate with profile/3. getwd() is supposed
to be implemented directly. What about other Unixes?
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
#if defined(HAVE_GETWD) && (defined(__sun__) || defined(__sun))
#undef HAVE_GETCWD
#endif
#if defined(HAVE_GETWD) && !defined(HAVE_GETCWD)
rval = getwd(buf);
#else
rval = getcwd(buf, sizeof(buf));
#endif
if ( !rval )
{ term_t tmp = PL_new_term_ref();
PL_put_atom(tmp, ATOM_dot);
PL_error(NULL, 0, OsError(), ERR_FILE_OPERATION,
ATOM_getcwd, ATOM_directory, tmp);
return NULL;
}
canonisePath(buf);
CWDlen = strlen(buf);
buf[CWDlen++] = '/';
buf[CWDlen] = EOS;
if ( CWDdir )
remove_string(CWDdir);
CWDdir = store_string(buf);
}
return (const char *)CWDdir;
}
char *
BaseName(const char *f)
{ const char *base;
for(base = f; *f; f++)
{ if (*f == '/')
base = f+1;
}
return (char *)base;
}
char *
DirName(const char *f, char *dir)
{ const char *base, *p;
for(base = p = f; *p; p++)
{ if (*p == '/' && p[1] != EOS )
base = p;
}
if ( base == f )
{ if ( *f == '/' )
strcpy(dir, "/");
else
strcpy(dir, ".");
} else
{ if ( dir != f ) /* otherwise it is in-place */
strncpy(dir, f, base-f);
dir[base-f] = EOS;
}
return dir;
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
bool ChDir(path)
char *path;
Change the current working directory to `path'. File names may depend
on `path'.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
bool
ChDir(const char *path)
{ GET_LD
char ospath[MAXPATHLEN];
char tmp[MAXPATHLEN];
OsPath(path, ospath);
if ( path[0] == EOS || streq(path, ".") ||
(CWDdir && streq(path, CWDdir)) )
succeed;
AbsoluteFile(path, tmp);
if ( chdir(ospath) == 0 )
{ size_t len;
len = strlen(tmp);
if ( len == 0 || tmp[len-1] != '/' )
{ tmp[len++] = '/';
tmp[len] = EOS;
}
CWDlen = len;
if ( CWDdir )
remove_string(CWDdir);
CWDdir = store_string(tmp);
succeed;
}
fail;
}
/********************************
* TIME CONVERSION *
*********************************/
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
struct tm *LocalTime(time_t time, struct tm *r)
Convert time in Unix internal form (seconds since Jan 1 1970) into a
structure providing easier access to the time.
For non-Unix systems: struct time is supposed to look like this.
Move This definition to pl-os.h and write the conversion functions
here.
struct tm {
int tm_sec; / * second in the minute (0-59)* /
int tm_min; / * minute in the hour (0-59) * /
int tm_hour; / * hour of the day (0-23) * /
int tm_mday; / * day of the month (1-31) * /
int tm_mon; / * month of the year (1-12) * /
int tm_year; / * year (0 = 1900) * /
int tm_wday; / * day in the week (1-7, 1 = sunday) * /
int tm_yday; / * day in the year (0-365) * /
int tm_isdst; / * daylight saving time info * /
};
time_t Time()
Return time in seconds after Jan 1 1970 (Unix' time notion).
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
struct tm *
LocalTime(long *t, struct tm *r)
{
#if defined(_REENTRANT) && defined(HAVE_LOCALTIME_R)
return localtime_r(t, r);
#else
*r = *localtime((const time_t *) t);
return r;
#endif
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
TERMINAL IO MANIPULATION
ResetStdin()
Clear the Sinput buffer after a saved state. Only necessary
if O_SAVE is defined.
PushTty(IOSTREAM *s, ttybuf *buf, int state)
Push the tty to the specified state and save the old state in
buf.
PopTty(IOSTREAM *s, ttybuf *buf)
Restore the tty state.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
static void
ResetStdin(void)
{ Sinput->limitp = Sinput->bufp = Sinput->buffer;
if ( !GD->os.org_terminal.read )
GD->os.org_terminal = *Sinput->functions;
}
static ssize_t
Sread_terminal(void *handle, char *buf, size_t size)
{ GET_LD
intptr_t h = (intptr_t)handle;
int fd = (int)h;
source_location oldsrc = LD->read_source;
if ( LD->prompt.next && ttymode != TTY_RAW )
PL_write_prompt(TRUE);
else
Sflush(Suser_output);
PL_dispatch(fd, PL_DISPATCH_WAIT);
size = (*GD->os.org_terminal.read)(handle, buf, size);
if ( size == 0 ) /* end-of-file */
{ if ( fd == 0 )
{ Sclearerr(Suser_input);
LD->prompt.next = TRUE;
}
} else if ( size > 0 && buf[size-1] == '\n' )
LD->prompt.next = TRUE;
LD->read_source = oldsrc;
return size;
}
void
ResetTty()
{ GET_LD
startCritical;
ResetStdin();
if ( !GD->os.iofunctions.read )
{ GD->os.iofunctions = *Sinput->functions;
GD->os.iofunctions.read = Sread_terminal;
Sinput->functions =
Soutput->functions =
Serror->functions = &GD->os.iofunctions;
}
LD->prompt.next = TRUE;
endCritical;
}
#ifdef O_HAVE_TERMIO /* sys/termios.h or sys/termio.h */
#ifndef HAVE_TCSETATTR
#ifndef NO_SYS_IOCTL_H_WITH_SYS_TERMIOS_H
#include <sys/ioctl.h>
#endif
#ifndef TIOCGETA
#define TIOCGETA TCGETA
#endif
#endif
bool
PushTty(IOSTREAM *s, ttybuf *buf, int mode)
{ GET_LD
struct termios tio;
int fd;
buf->mode = ttymode;
ttymode = mode;
if ( (fd = Sfileno(s)) < 0 || !isatty(fd) )
succeed; /* not a terminal */
if ( !truePrologFlag(PLFLAG_TTY_CONTROL) )
succeed;
#ifdef HAVE_TCSETATTR
if ( tcgetattr(fd, &buf->tab) ) /* save the old one */
fail;
#else
if ( ioctl(fd, TIOCGETA, &buf->tab) ) /* save the old one */
fail;
#endif
tio = buf->tab;
switch( mode )
{ case TTY_RAW:
#if defined(HAVE_TCSETATTR) && defined(HAVE_CFMAKERAW)
cfmakeraw(&tio);
tio.c_oflag = buf->tab.c_oflag; /* donot change output modes */
tio.c_lflag |= ISIG;
#else
tio.c_lflag &= ~(ECHO|ICANON);
#endif
/* OpenBSD requires this anyhow!? */
/* Bug in OpenBSD or must we? */
/* Could this do any harm? */
tio.c_cc[VTIME] = 0, tio.c_cc[VMIN] = 1;
break;
case TTY_OUTPUT:
tio.c_oflag |= (OPOST|ONLCR);
break;
case TTY_SAVE:
succeed;
default:
sysError("Unknown PushTty() mode: %d", mode);
/*NOTREACHED*/
}
#ifdef HAVE_TCSETATTR
if ( tcsetattr(fd, TCSANOW, &tio) != 0 )
{ static int MTOK_warned; /* MT-OK */
if ( !MTOK_warned++ )
warning("Failed to set terminal: %s", OsError());
}
#else
#ifdef TIOCSETAW
ioctl(fd, TIOCSETAW, &tio);
#else
ioctl(fd, TCSETAW, &tio);
ioctl(fd, TCXONC, (void *)1);
#endif
#endif
succeed;
}
bool
PopTty(IOSTREAM *s, ttybuf *buf)
{ GET_LD
int fd;
ttymode = buf->mode;
if ( (fd = Sfileno(s)) < 0 || !isatty(fd) )
succeed; /* not a terminal */
if ( !truePrologFlag(PLFLAG_TTY_CONTROL) )
succeed;
#ifdef HAVE_TCSETATTR
tcsetattr(fd, TCSANOW, &buf->tab);
#else
#ifdef TIOCSETA
ioctl(fd, TIOCSETA, &buf->tab);
#else
ioctl(fd, TCSETA, &buf->tab);
ioctl(fd, TCXONC, (void *)1);
#endif
#endif
succeed;
}
#else /* O_HAVE_TERMIO */
#ifdef HAVE_SGTTYB
bool
PushTty(IOSTREAM *s, ttybuf *buf, int mode)
{ struct sgttyb tio;
int fd;
buf->mode = ttymode;
ttymode = mode;
if ( (fd = Sfileno(s)) < 0 || !isatty(fd) )
succeed; /* not a terminal */
if ( !truePrologFlag(PLFLAG_TTY_CONTROL) )
succeed;
if ( ioctl(fd, TIOCGETP, &buf->tab) ) /* save the old one */
fail;
tio = buf->tab;
switch( mode )
{ case TTY_RAW:
tio.sg_flags |= CBREAK;
tio.sg_flags &= ~ECHO;
break;
case TTY_OUTPUT:
tio.sg_flags |= (CRMOD);
break;
case TTY_SAVE:
succeed;
default:
sysError("Unknown PushTty() mode: %d", mode);
/*NOTREACHED*/
}
ioctl(fd, TIOCSETP, &tio);
ioctl(fd, TIOCSTART, NULL);
succeed;
}
bool
PopTty(IOSTREAM *s, ttybuf *buf)
{ ttymode = buf->mode;
int fd;
if ( (fd = Sfileno(s)) < 0 || !isatty(fd) )
succeed; /* not a terminal */
if ( !truePrologFlag(PLFLAG_TTY_CONTROL) )
succeed;
ioctl(fd, TIOCSETP, &buf->tab);
ioctl(fd, TIOCSTART, NULL);
succeed;
}
#else /*HAVE_SGTTYB*/
bool
PushTty(IOSTREAM *s, ttybuf *buf, int mode)
{ buf->mode = ttymode;
ttymode = mode;
succeed;
}
bool
PopTty(IOSTREAM *s, ttybuf *buf)
{ GET_LD
ttymode = buf->mode;
if ( ttymode != TTY_RAW )
LD->prompt.next = TRUE;
succeed;
}
#endif /*HAVE_SGTTYB*/
#endif /*O_HAVE_TERMIO*/
/********************************
* ENVIRONMENT CONTROL *
*********************************/
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Simple library to manipulate the OS environment. The modified
environment will be passed to child processes and the can also be
requested via getenv/2 from Prolog. Functions
int Setenv(name, value)
char *name, *value;
Set the OS environment variable with name `name'. If it exists
its value is changed, otherwise a new entry in the environment is
created. The return value is a pointer to the old value, or NULL if
the variable is new.
int Unsetenv(name)
char *name;
Delete a variable from the environment. Return value is the old
value, or NULL if the variable did not exist.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
size_t
getenv3(const char *name, char *buf, size_t len)
{
#if O_XOS
return _xos_getenv(name, buf, len);
#else
char *s = getenv(name);
size_t l;
if ( s )
{ if ( (l=strlen(s)) < len )
memcpy(buf, s, l+1);
else if ( len > 0 )
buf[0] = EOS; /* empty string if not fit */
return l;
}
return (size_t)-1;
#endif
}
char *
Getenv(const char *name, char *buf, size_t len)
{ size_t l = getenv3(name, buf, len);
if ( l != (size_t)-1 && l < len )
return buf;
return NULL;
}
#if defined(HAVE_PUTENV) || defined(HAVE_SETENV)
int
Setenv(char *name, char *value)
{
#ifdef HAVE_SETENV
if ( setenv(name, value, TRUE) != 0 )
return PL_error(NULL, 0, MSG_ERRNO, ERR_SYSCALL, "setenv");
#else
char *buf;
if ( *name == '\0' || strchr(name, '=') != NULL )
{ errno = EINVAL;
return PL_error(NULL, 0, MSG_ERRNO, ERR_SYSCALL, "setenv");
}
buf = alloca(strlen(name) + strlen(value) + 2);
if ( buf )
{ Ssprintf(buf, "%s=%s", name, value);
if ( putenv(store_string(buf)) < 0 )
return PL_error(NULL, 0, MSG_ERRNO, ERR_SYSCALL, "setenv");
} else
return PL_error(NULL, 0, NULL, ERR_NOMEM);
#endif
succeed;
}
int
Unsetenv(char *name)
{
#ifdef HAVE_UNSETENV
#ifdef VOID_UNSETENV
unsetenv(name);
#else
if ( unsetenv(name) < 0 )
return PL_error(NULL, 0, MSG_ERRNO, ERR_SYSCALL, "unsetenv");
#endif
succeed;
#else
if ( !getenv(name) )
succeed;
return Setenv(name, "");
#endif
}
static void
initEnviron()
{
}
#else /*HAVE_PUTENV*/
extern char **environ; /* Unix predefined environment */
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Grow the environment array by one and return the (possibly moved) base
pointer to the new environment.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
forwards char **growEnviron(char**, int);
forwards char *matchName(char *, char *);
forwards void setEntry(char **, char *, char *);
static char **
growEnviron(char **e, int amount)
{ static int filled;
static int size = -1;
if ( amount == 0 ) /* reset after a dump */
{ size = -1;
return e;
}
if ( size < 0 )
{ char **env, **e1, **e2;
for(e1=e, filled=0; *e1; e1++, filled++)
;
size = ROUND(filled+10+amount, 32);
env = (char **)malloc(size * sizeof(char *));
for ( e1=e, e2=env; *e1; *e2++ = *e1++ )
;
*e2 = (char *) NULL;
filled += amount;
return env;
}
filled += amount;
if ( filled + 1 > size )
{ char **env, **e1, **e2;
size += 32;
env = (char **)realloc(e, size * sizeof(char *));
for ( e1=e, e2=env; *e1; *e2++ = *e1++ )
;
*e2 = (char *) NULL;
return env;
}
return e;
}
static void
initEnviron(void)
{ growEnviron(environ, 0);
}
static char *
matchName(const char *e, const char *name)
{ while( *name && *e == *name )
e++, name++;
if ( (*e == '=' || *e == EOS) && *name == EOS )
return (*e == '=' ? e+1 : e);
return (char *) NULL;
}
static void
setEntry(char **e, char *name, char *value)
{ int l = (int)strlen(name);
*e = (char *) malloc(l + strlen(value) + 2);
strcpy(*e, name);
e[0][l++] = '=';
strcpy(&e[0][l], value);
}
char *
Setenv(char *name, char *value)
{ char **e;
char *v;
int n;
for(n=0, e=environ; *e; e++, n++)
{ if ( (v=matchName(*e, name)) != NULL )
{ if ( !streq(v, value) )
setEntry(e, name, value);
return v;
}
}
environ = growEnviron(environ, 1);
setEntry(&environ[n], name, value);
environ[n+1] = (char *) NULL;
return (char *) NULL;
}
char *
Unsetenv(char *name)
{ char **e;
char *v;
int n;
for(n=0, e=environ; *e; e++, n++)
{ if ( (v=matchName(*e, name)) != NULL )
{ environ = growEnviron(environ, -1);
e = &environ[n];
do
{ e[0] = e[1];
e++;
} while(*e);
return v;
}
}
return (char *) NULL;
}
#endif /*HAVE_PUTENV*/
/********************************
* SYSTEM PROCESSES *
*********************************/
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
int System(command)
char *command;
Invoke a command on the operating system. The return value is the
exit status of the command. Return value 0 implies succesful
completion. If you are not running Unix your C-library might provide
an alternative.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
#ifdef __unix__
#define SPECIFIC_SYSTEM 1
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
According to the autoconf docs HAVE_SYS_WAIT_H is set if sys/wait.h is
defined *and* is POSIX.1 compliant, which implies it uses int status
argument to wait()
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
#ifdef HAVE_SYS_WAIT_H
#undef UNION_WAIT
#include <sys/wait.h>
#define wait_t int
#ifndef WEXITSTATUS
# define WEXITSTATUS(stat_val) ((unsigned)(stat_val) >> 8)
#endif
#ifndef WIFEXITED
# define WIFEXITED(stat_val) (((stat_val) & 255) == 0)
#endif
#else /*HAVE_SYS_WAIT_H*/
#ifdef UNION_WAIT /* Old BSD style wait */
#include <sys/wait.h>
#define wait_t union wait
#ifndef WEXITSTATUS
#define WEXITSTATUS(s) ((s).w_status)
#endif
#ifndef WTERMSIG
#define WTERMSIG(s) ((s).w_status)
#endif
#endif /*UNION_WAIT*/
#endif /*HAVE_SYS_WAIT_H*/
int
System(char *cmd)
{ GET_LD
int pid;
char *shell = "/bin/sh";
int rval;
void (*old_int)();
void (*old_stop)();
if ( (pid = fork()) == -1 )
{ return PL_error("shell", 2, OsError(), ERR_SYSCALL, "fork");
} else if ( pid == 0 ) /* The child */
{ Setenv("PROLOGCHILD", "yes");
PL_cleanup_fork();
execl(shell, BaseName(shell), "-c", cmd, (char *)0);
fatalError("Failed to execute %s: %s", shell, OsError());
fail;
/*NOTREACHED*/
} else
{ wait_t status; /* the parent */
int n;
old_int = signal(SIGINT, SIG_IGN);
#ifdef SIGTSTP
old_stop = signal(SIGTSTP, SIG_DFL);
#endif /* SIGTSTP */
for(;;)
{
#ifdef HAVE_WAITPID
n = waitpid(pid, &status, 0);
#else
n = wait(&status);
#endif
if ( n == -1 && errno == EINTR )
continue;
if ( n != pid )
continue;
break;
}
if ( n == -1 )
{ term_t tmp = PL_new_term_ref();
PL_put_atom_chars(tmp, cmd);
PL_error("shell", 2, MSG_ERRNO, ERR_SHELL_FAILED, tmp);
rval = 1;
} else if (WIFEXITED(status))
{ rval = WEXITSTATUS(status);
#ifdef WIFSIGNALED
} else if (WIFSIGNALED(status))
{ term_t tmp = PL_new_term_ref();
int sig = WTERMSIG(status);
PL_put_atom_chars(tmp, cmd);
PL_error("shell", 2, NULL, ERR_SHELL_SIGNALLED, tmp, sig);
rval = 1;
#endif
} else
{ rval = 1; /* make gcc happy */
fatalError("Unknown return code from wait(3)");
/*NOTREACHED*/
}
}
signal(SIGINT, old_int); /* restore signal handlers */
#ifdef SIGTSTP
signal(SIGTSTP, old_stop);
#endif /* SIGTSTP */
return rval;
}
#endif /* __unix__ */
#ifdef HAVE_WINEXEC /* Windows 3.1 */
#define SPECIFIC_SYSTEM 1
int
System(char *command)
{ char *msg;
int rval = WinExec(command, SW_SHOWNORMAL);
if ( rval < 32 )
{ switch( rval )
{ case 0: msg = "Not enough memory"; break;
case 2: msg = "File not found"; break;
case 3: msg = "No path"; break;
case 5: msg = "Unknown error"; break;
case 6: msg = "Lib requires separate data segment"; break;
case 8: msg = "Not enough memory"; break;
case 10: msg = "Incompatible Windows version"; break;
case 11: msg = "Bad executable file"; break;
case 12: msg = "Incompatible operating system"; break;
case 13: msg = "MS-DOS 4.0 executable"; break;
case 14: msg = "Unknown executable file type"; break;
case 15: msg = "Real-mode application"; break;
case 16: msg = "Cannot start multiple copies"; break;
case 19: msg = "Executable is compressed"; break;
case 20: msg = "Invalid DLL"; break;
case 21: msg = "Application is 32-bits"; break;
default: msg = "Unknown error";
}
warning("Could not start %s: error %d (%s)",
command, rval, msg);
return 1;
}
return 0;
}
#endif
#ifdef __WINDOWS__
#define SPECIFIC_SYSTEM 1
/* definition in pl-nt.c */
#endif
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Nothing special is needed. Just hope the C-library defines system().
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
#ifndef SPECIFIC_SYSTEM
int
System(command)
char *command;
{ return system(command);
}
#endif
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
[candidate]
exec(+Cmd, [+In, +Out, +Error], -Pid)
The streams may be one of standard stream, std, null stream, null, or
pipe(S), where S is a pipe stream
Detach if none is std!
TBD: Sort out status. The above is SICStus 3. YAP uses `Status' for last
argument (strange). SICStus 4 appears to drop this altogether.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
char *Symbols(char *buf)
Return the path name of the executable of SWI-Prolog.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
#ifndef __WINDOWS__ /* Win32 version in pl-nt.c */
char *
findExecutable(const char *av0, char *buffer)
{ char *file;
char buf[MAXPATHLEN];
char tmp[MAXPATHLEN];
if ( !av0 || !PrologPath(av0, buf, sizeof(buf)) )
return NULL;
file = Which(buf, tmp);
#if __unix__ || __APPLE__ /* argv[0] can be an #! script! */
if ( file )
{ int n, fd;
char buf[MAXPATHLEN];
/* Fails if mode is x-only, but */
/* then it can't be a script! */
if ( (fd = open(file, O_RDONLY)) < 0 )
return strcpy(buffer, file);
if ( (n=read(fd, buf, sizeof(buf)-1)) > 0 )
{ close(fd);
buf[n] = EOS;
if ( strncmp(buf, "#!", 2) == 0 )
{ char *s = &buf[2], *q;
while(*s && isBlank(*s))
s++;
for(q=s; *q && !isBlank(*q); q++)
;
*q = EOS;
return strcpy(buffer, s);
}
}
close(fd);
}
#endif /*__unix__*/
return strcpy(buffer, file ? file : buf);
}
#endif /*__WINDOWS__*/
#if __unix__ || __APPLE__
static char *
okToExec(const char *s)
{ struct stat stbuff;
if (statfunc(s, &stbuff) == 0 && /* stat it */
S_ISREG(stbuff.st_mode) && /* check for file */
access(s, X_OK) == 0) /* can be executed? */
return (char *)s;
else
return (char *) NULL;
}
#define PATHSEP ':'
#endif /* __unix__ */
#if defined(OS2) || defined(__DOS__) || defined(__WINDOWS__)
#define EXEC_EXTENSIONS { ".exe", ".com", ".bat", ".cmd", NULL }
#define PATHSEP ';'
#endif
#ifdef EXEC_EXTENSIONS
static char *
okToExec(const char *s)
{ static char *extensions[] = EXEC_EXTENSIONS;
static char **ext;
DEBUG(2, Sdprintf("Checking %s\n", s));
for(ext = extensions; *ext; ext++)
if ( stripostfix(s, *ext) )
return ExistsFile(s) ? (char *)s : (char *) NULL;
for(ext = extensions; *ext; ext++)
{ static char path[MAXPATHLEN];
strcpy(path, s);
strcat(path, *ext);
if ( ExistsFile(path) )
return path;
}
return (char *) NULL;
}
#endif /*EXEC_EXTENSIONS*/
static char *
Which(const char *program, char *fullname)
{ char *path, *dir;
char *e;
if ( IsAbsolutePath(program) ||
#if OS2 && EMX
isDriveRelativePath(program) ||
#endif /* OS2 */
isRelativePath(program) ||
strchr(program, '/') )
{ if ( (e = okToExec(program)) != NULL )
{ strcpy(fullname, e);
return fullname;
}
return NULL;
}
#if OS2 && EMX
if ((e = okToExec(program)) != NULL)
{
getcwd(fullname, MAXPATHLEN);
strcat(fullname, "/");
strcat(fullname, e);
return fullname;
}
#endif /* OS2 */
if ((path = getenv("PATH") ) == 0)
path = DEFAULT_PATH;
while(*path)
{ if ( *path == PATHSEP )
{ if ( (e = okToExec(program)) )
return strcpy(fullname, e);
else
path++; /* fix by Ron Hess (hess@sco.com) */
} else
{ char tmp[MAXPATHLEN];
for(dir = fullname; *path && *path != PATHSEP; *dir++ = *path++)
;
if (*path)
path++; /* skip : */
if ((dir-fullname) + strlen(program)+2 > MAXPATHLEN)
continue;
*dir++ = '/';
strcpy(dir, program);
if ( (e = okToExec(OsPath(fullname, tmp))) )
return strcpy(fullname, e);
}
}
return NULL;
}
/** int Pause(double time)
Suspend execution `time' seconds. Time is given as a floating point
number, expressing the time to sleep in seconds. Just about every
platform requires it own implementation. We provide them in the order of
preference. The implementations differ on their granularity and whether
or not they can be interrupted savely restarted. The recent POSIX
nanosleep() is just about the only function that really works well:
accurate, interruptable and restartable.
*/
#ifdef __WINDOWS__
#define PAUSE_DONE 1 /* see pl-nt.c */
#endif
#if !defined(PAUSE_DONE) && defined(HAVE_NANOSLEEP)
#define PAUSE_DONE 1
int
Pause(double t)
{ struct timespec req;
int rc;
if ( t < 0.0 )
succeed;
req.tv_sec = (time_t) t;
req.tv_nsec = (long)((t - floor(t)) * 1000000000);
for(;;)
{ rc = nanosleep(&req, &req);
if ( rc == -1 && errno == EINTR )
{ if ( PL_handle_signals() < 0 )
return FALSE;
} else
return TRUE;
}
}
#endif /*HAVE_NANOSLEEP*/
#if !defined(PAUSE_DONE) && defined(HAVE_USLEEP)
#define PAUSE_DONE 1
int
Pause(double t)
{ if ( t <= 0.0 )
return TRUE;
usleep((unsigned long)(t * 1000000.0));
return TRUE;
}
#endif /*HAVE_USLEEP*/
#if !defined(PAUSE_DONE) && defined(HAVE_SELECT)
#define PAUSE_DONE 1
int
Pause(double time)
{ struct timeval timeout;
if ( time <= 0.0 )
return;
if ( time < 60.0 ) /* select() is expensive. Does it make sense */
{ timeout.tv_sec = (long)time;
timeout.tv_usec = (long)(time * 1000000) % 1000000;
select(32, NULL, NULL, NULL, &timeout);
return TRUE;
} else
{ int rc;
int left = (int)(time+0.5);
do
{ rc = sleep(left);
if ( rc == -1 && errno == EINTR )
{ if ( PL_handle_signals() < 0 )
return FALSE;
return TRUE;
}
left -= rc;
} while ( rc != 0 );
}
}
#endif /*HAVE_SELECT*/
#if !defined(PAUSE_DONE) && defined(HAVE_DOSSLEEP)
#define PAUSE_DONE 1
int /* a millisecond granualrity. */
Pause(double time) /* the EMX function sleep uses seconds */
{ if ( time <= 0.0 ) /* the select() trick does not work at all. */
return TRUE;
DosSleep((ULONG)(time * 1000));
return TRUE;
}
#endif /*HAVE_DOSSLEEP*/
#if !defined(PAUSE_DONE) && defined(HAVE_SLEEP)
#define PAUSE_DONE 1
int
Pause(double t)
{ if ( t <= 0.5 )
succeed;
sleep((int)(t + 0.5));
succeed;
}
#endif /*HAVE_SLEEP*/
#if !defined(PAUSE_DONE) && defined(HAVE_DELAY)
#define PAUSE_DONE 1
int
Pause(double t)
{ delay((int)(t * 1000));
return TRUE;
}
#endif /*HAVE_DELAY*/
#ifndef PAUSE_DONE
int
Pause(double t)
{ return notImplemented("sleep", 1);
}
#endif
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