/* Part of SWI-Prolog Author: Jan Wielemaker E-mail: J.Wielemaker@vu.nl WWW: http://www.swi-prolog.org Copyright (C): 1985-2013, University of Amsterdam VU University 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /* Modified (M) 1993 Dave Sherratt */ /*#define O_DEBUG 1*/ #if OS2 && EMX #include /* this has to appear before pl-incl.h */ #endif //@{ /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Solaris has asctime_r() with 3 arguments. Using _POSIX_PTHREAD_SEMANTICS is supposed to give the POSIX standard one. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */ #if defined(__sun__) || defined(__sun) #define _POSIX_PTHREAD_SEMANTICS 1 #endif #define __MINGW_USE_VC2005_COMPAT /* Get Windows time_t as 64-bit */ #include "pl-incl.h" #include "pl-ctype.h" #include "pl-utf8.h" #include #include #include /* rename() and remove() prototypes */ #if TIME_WITH_SYS_TIME # include # include #else # if HAVE_SYS_TIME_H # include # else # include # endif #endif #if HAVE_SYS_STAT_H #include #endif #if HAVE_ALLOCA_H #include #endif #ifdef O_XOS #define statstruct struct _stati64 #else #define statstruct struct stat #define statfunc stat #endif #if HAVE_PWD_H #include #endif #if HAVE_VFORK_H #include #endif #ifdef HAVE_UNISTD_H #include #endif #ifdef HAVE_SYS_FILE_H #include #endif #if defined(HAVE_SYS_RESOURCE_H) #include #endif #ifdef HAVE_FTIME #include #endif #include #include #ifndef __WATCOMC__ /* appears a conflict */ #include #endif #if defined(__WATCOMC__) #include #include #endif #if OS2 && EMX static double initial_time; #endif /* OS2 */ #define LOCK() PL_LOCK(L_OS) #define UNLOCK() PL_UNLOCK(L_OS) static void initEnviron(void); #ifndef DEFAULT_PATH #define DEFAULT_PATH "/bin:/usr/bin" #endif /** shell(+Command:text, -Status:integer) is det. Run an external command and wait for its completion. */ static PRED_IMPL("shell", 2, shell, 0) { GET_LD char *cmd; if ( PL_get_chars(A1, &cmd, CVT_ALL|REP_FN|CVT_EXCEPTION) ) { int rval = System(cmd); return PL_unify_integer(A2, rval); } fail; } /******************************** * INITIALISATION * *********************************/ /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - bool initOs() Initialise the OS dependant functions. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */ bool initOs(void) { GET_LD GD->statistics.start_time = WallTime(); initEnviron(); #ifdef __WINDOWS__ setPrologFlagMask(PLFLAG_FILE_CASE_PRESERVING); #else setPrologFlagMask(PLFLAG_FILE_CASE); setPrologFlagMask(PLFLAG_FILE_CASE_PRESERVING); #endif DEBUG(1, Sdprintf("OS:done\n")); succeed; } void cleanupOs(void) { } /******************************** * 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. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */ #ifdef HAVE_CLOCK_GETTIME #define timespec_to_double(ts) \ ((double)(ts).tv_sec + (double)(ts).tv_nsec/(double)1000000000.0) #endif #ifndef __WINDOWS__ /* defined in pl-nt.c */ #ifdef HAVE_TIMES #include #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) { #if defined(HAVE_CLOCK_GETTIME) && defined(CLOCK_PROCESS_CPUTIME_ID) #define CPU_TIME_DONE struct timespec ts; (void)which; if ( clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts) == 0 ) return timespec_to_double(ts); return 0.0; #endif #if !defined(CPU_TIME_DONE) && defined(HAVE_TIMES) #define CPU_TIME_DONE 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; #endif #if !defined(CPU_TIME_DONE) (void)which; return 0.0; #endif } #endif /*__WINDOWS__*/ double WallTime(void) { double stime; #if HAVE_CLOCK_GETTIME struct timespec tp; clock_gettime(CLOCK_REALTIME, &tp); stime = timespec_to_double(tp); #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 #include int CpuCount(void) { 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, 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 (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. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */ 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 } #if HAVE_SRANDOM srandom(seed); #elif HAVE_SRAND srand(seed); #endif } uint64_t _PL_Random(void) { GET_LD if ( !LD->os.rand_initialised ) { setRandom(NULL); LD->os.rand_initialised = TRUE; } #ifdef HAVE_RANDOM { uint64_t l = random(); l ^= (uint64_t)random()<<15; l ^= (uint64_t)random()<<30; l ^= (uint64_t)random()<<45; return l; } #else { uint64_t l = rand(); /* 0 #include #define O_HAVE_TERMIO 1 #else /*HAVE_TCSETATTR*/ #ifdef HAVE_SYS_TERMIO_H #include #define termios termio #define O_HAVE_TERMIO 1 #else #ifdef HAVE_SYS_TERMIOS_H #include #define O_HAVE_TERMIO 1 #endif #endif #endif /*HAVE_TCSETATTR*/ typedef struct tty_state { #if defined(O_HAVE_TERMIO) struct termios tab; #elif defined(HAVE_SGTTYB) struct sgttyb tab; #else int tab; /* empty is not allowed */ #endif } tty_state; #define TTY_STATE(buf) (((tty_state*)(buf->state))->tab) /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 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 ( Soutput && True(Soutput, SIO_ISATTY) ) { 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(void) { 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 #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; buf->state = NULL; ttymode = mode; if ( (fd = Sfileno(s)) < 0 || !isatty(fd) ) succeed; /* not a terminal */ if ( !truePrologFlag(PLFLAG_TTY_CONTROL) ) succeed; buf->state = allocHeapOrHalt(sizeof(tty_state)); #ifdef HAVE_TCSETATTR if ( tcgetattr(fd, &TTY_STATE(buf)) ) /* save the old one */ fail; #else if ( ioctl(fd, TIOCGETA, &TTY_STATE(buf)) ) /* save the old one */ fail; #endif tio = TTY_STATE(buf); switch( mode ) { case TTY_RAW: #if defined(HAVE_TCSETATTR) && defined(HAVE_CFMAKERAW) cfmakeraw(&tio); tio.c_oflag = TTY_STATE(buf).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, int do_free) { ttymode = buf->mode; if ( buf->state ) { int fd = Sfileno(s); if ( fd >= 0 ) { #ifdef HAVE_TCSETATTR tcsetattr(fd, TCSANOW, &TTY_STATE(buf)); #else #ifdef TIOCSETA ioctl(fd, TIOCSETA, &TTY_STATE(buf)); #else ioctl(fd, TCSETA, &TTY_STATE(buf)); ioctl(fd, TCXONC, (void *)1); #endif #endif } if ( do_free ) { freeHeap(buf->state, sizeof(tty_state)); buf->state = NULL; } } succeed; } #else /* O_HAVE_TERMIO */ #ifdef HAVE_SGTTYB bool PushTty(IOSTREAM *s, ttybuf *buf, int mode) { struct sgttyb tio; int fd; buf->mode = ttymode; buf->state = NULL; ttymode = mode; if ( (fd = Sfileno(s)) < 0 || !isatty(fd) ) succeed; /* not a terminal */ if ( !truePrologFlag(PLFLAG_TTY_CONTROL) ) succeed; buf->state = allocHeapOrHalt(sizeof(tty_state)); if ( ioctl(fd, TIOCGETP, &TTY_STATE(buf)) ) /* save the old one */ fail; tio = TTY_STATE(buf); 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, int do_free) { ttymode = buf->mode; if ( buf->state ) { int fd = Sfileno(s); if ( fd >= 0 ) { ioctl(fd, TIOCSETP, &buf->tab); ioctl(fd, TIOCSTART, NULL); } if ( do_free ) { freeHeap(buf->state, sizeof(tty_state)); buf->state = 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, int do_free) { 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 ) memmove(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 **)PL_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 **)PL_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) { size_t l = strlen(name); *e = PL_malloc_atomic(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 #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 #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*/ typedef void (*sigf_t)(int sig); int System(char *cmd) { GET_LD int pid; char *shell = "/bin/sh"; int rval; sigf_t old_int, 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 = (sigf_t)signal(SIGINT, SIG_IGN); #ifdef SIGTSTP old_stop = (sigf_t)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 #ifndef _YAP_NOT_INSTALLED_ /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - char *findExecutable(char *buf) Return the path name of the executable of SWI-Prolog. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */ #ifndef __WINDOWS__ /* Win32 version in pl-nt.c */ static char * Which(const char *program, char *fullname); 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__ /* 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); } #ifdef __unix__ static char * okToExec(const char *s) { statstruct 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*/ #define isRelativePath(p) ( p[0] == '.' ) 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);1 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; } #endif /*__WINDOWS__*/ #endif /** 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 BeginPredDefs(system) PRED_DEF("shell", 2, shell, 0) EndPredDefs // @}