Re: [perl #24554] Segfault in POSIX module

[p5sagit/p5-mst-13.2.git] / ext / POSIX / POSIX.xs

#define PERL_EXT_POSIX

#ifdef NETWARE
	#define _POSIX_
	/*
	 * Ideally this should be somewhere down in the includes
	 * but putting it in other places is giving compiler errors.
	 * Also here I am unable to check for HAS_UNAME since it wouldn't have
	 * yet come into the file at this stage - sgp 18th Oct 2000
	 */
	#include <sys/utsname.h>
#endif	/* NETWARE */

#define PERL_NO_GET_CONTEXT

#include "EXTERN.h"
#define PERLIO_NOT_STDIO 1
#include "perl.h"
#include "XSUB.h"
#if defined(PERL_IMPLICIT_SYS)
#  undef signal
#  undef open
#  undef setmode
#  define open PerlLIO_open3
#endif
#include <ctype.h>
#ifdef I_DIRENT    /* XXX maybe better to just rely on perl.h? */
#include <dirent.h>
#endif
#include <errno.h>
#ifdef I_FLOAT
#include <float.h>
#endif
#ifdef I_LIMITS
#include <limits.h>
#endif
#include <locale.h>
#include <math.h>
#ifdef I_PWD
#include <pwd.h>
#endif
#include <setjmp.h>
#include <signal.h>
#include <stdarg.h>

#ifdef I_STDDEF
#include <stddef.h>
#endif

#ifdef I_UNISTD
#include <unistd.h>
#endif

/* XXX This comment is just to make I_TERMIO and I_SGTTY visible to 
   metaconfig for future extension writers.  We don't use them in POSIX.
   (This is really sneaky :-)  --AD
*/
#if defined(I_TERMIOS)
#include <termios.h>
#endif
#ifdef I_STDLIB
#include <stdlib.h>
#endif
#ifndef __ultrix__
#include <string.h>
#endif
#include <sys/stat.h>
#include <sys/types.h>
#include <time.h>
#ifdef I_UNISTD
#include <unistd.h>
#endif
#ifdef MACOS_TRADITIONAL
#undef fdopen
#endif
#include <fcntl.h>

#ifdef HAS_TZNAME
#  if !defined(WIN32) && !defined(__CYGWIN__) && !defined(NETWARE) && !defined(__UWIN__)
extern char *tzname[];
#  endif
#else
#if !defined(WIN32) && !defined(__UWIN__) || (defined(__MINGW32__) && !defined(tzname))
char *tzname[] = { "" , "" };
#endif
#endif

#if defined(__VMS) && !defined(__POSIX_SOURCE)
#  include <libdef.h>       /* LIB$_INVARG constant */
#  include <lib$routines.h> /* prototype for lib$ediv() */
#  include <starlet.h>      /* prototype for sys$gettim() */
#  if DECC_VERSION < 50000000
#    define pid_t int       /* old versions of DECC miss this in types.h */
#  endif

#  undef mkfifo
#  define mkfifo(a,b) (not_here("mkfifo"),-1)
#  define tzset() not_here("tzset")

#if ((__VMS_VER >= 70000000) && (__DECC_VER >= 50200000)) || (__CRTL_VER >= 70000000)
#    define HAS_TZNAME  /* shows up in VMS 7.0 or Dec C 5.6 */
#    include <utsname.h>
#  endif /* __VMS_VER >= 70000000 or Dec C 5.6 */

   /* The POSIX notion of ttyname() is better served by getname() under VMS */
   static char ttnambuf[64];
#  define ttyname(fd) (isatty(fd) > 0 ? getname(fd,ttnambuf,0) : NULL)

   /* The non-POSIX CRTL times() has void return type, so we just get the
      current time directly */
   clock_t vms_times(struct tms *bufptr) {
	dTHX;
	clock_t retval;
	/* Get wall time and convert to 10 ms intervals to
	 * produce the return value that the POSIX standard expects */
#  if defined(__DECC) && defined (__ALPHA)
#    include <ints.h>
	uint64 vmstime;
	_ckvmssts(sys$gettim(&vmstime));
	vmstime /= 100000;
	retval = vmstime & 0x7fffffff;
#  else
	/* (Older hw or ccs don't have an atomic 64-bit type, so we
	 * juggle 32-bit ints (and a float) to produce a time_t result
	 * with minimal loss of information.) */
	long int vmstime[2],remainder,divisor = 100000;
	_ckvmssts(sys$gettim((unsigned long int *)vmstime));
	vmstime[1] &= 0x7fff;  /* prevent overflow in EDIV */
	_ckvmssts(lib$ediv(&divisor,vmstime,(long int *)&retval,&remainder));
#  endif
	/* Fill in the struct tms using the CRTL routine . . .*/
	times((tbuffer_t *)bufptr);
	return (clock_t) retval;
   }
#  define times(t) vms_times(t)
#else
#if defined (__CYGWIN__)
#    define tzname _tzname
#endif
#if defined (WIN32) || defined (NETWARE)
#  undef mkfifo
#  define mkfifo(a,b) not_here("mkfifo")
#  define ttyname(a) (char*)not_here("ttyname")
#  define sigset_t long
#  define pid_t long
#  ifdef __BORLANDC__
#    define tzname _tzname
#  endif
#  ifdef _MSC_VER
#    define mode_t short
#  endif
#  ifdef __MINGW32__
#    define mode_t short
#    ifndef tzset
#      define tzset()		not_here("tzset")
#    endif
#    ifndef _POSIX_OPEN_MAX
#      define _POSIX_OPEN_MAX	FOPEN_MAX	/* XXX bogus ? */
#    endif
#  endif
#  define sigaction(a,b,c)	not_here("sigaction")
#  define sigpending(a)		not_here("sigpending")
#  define sigprocmask(a,b,c)	not_here("sigprocmask")
#  define sigsuspend(a)		not_here("sigsuspend")
#  define sigemptyset(a)	not_here("sigemptyset")
#  define sigaddset(a,b)	not_here("sigaddset")
#  define sigdelset(a,b)	not_here("sigdelset")
#  define sigfillset(a)		not_here("sigfillset")
#  define sigismember(a,b)	not_here("sigismember")
#ifndef NETWARE
#  undef setuid
#  undef setgid
#  define setuid(a)		not_here("setuid")
#  define setgid(a)		not_here("setgid")
#endif	/* NETWARE */
#else

#  ifndef HAS_MKFIFO
#    if defined(OS2) || defined(MACOS_TRADITIONAL)
#      define mkfifo(a,b) not_here("mkfifo")
#    else	/* !( defined OS2 ) */ 
#      ifndef mkfifo
#        define mkfifo(path, mode) (mknod((path), (mode) | S_IFIFO, 0))
#      endif
#    endif
#  endif /* !HAS_MKFIFO */

#  ifdef MACOS_TRADITIONAL
#    define ttyname(a) (char*)not_here("ttyname")
#    define tzset() not_here("tzset")
#  else
#    include <grp.h>
#    include <sys/times.h>
#    ifdef HAS_UNAME
#      include <sys/utsname.h>
#    endif
#    include <sys/wait.h>
#  endif
#  ifdef I_UTIME
#    include <utime.h>
#  endif
#endif /* WIN32 || NETWARE */
#endif /* __VMS */

typedef int SysRet;
typedef long SysRetLong;
typedef sigset_t* POSIX__SigSet;
typedef HV* POSIX__SigAction;
#ifdef I_TERMIOS
typedef struct termios* POSIX__Termios;
#else /* Define termios types to int, and call not_here for the functions.*/
#define POSIX__Termios int
#define speed_t int
#define tcflag_t int
#define cc_t int
#define cfgetispeed(x) not_here("cfgetispeed")
#define cfgetospeed(x) not_here("cfgetospeed")
#define tcdrain(x) not_here("tcdrain")
#define tcflush(x,y) not_here("tcflush")
#define tcsendbreak(x,y) not_here("tcsendbreak")
#define cfsetispeed(x,y) not_here("cfsetispeed")
#define cfsetospeed(x,y) not_here("cfsetospeed")
#define ctermid(x) (char *) not_here("ctermid")
#define tcflow(x,y) not_here("tcflow")
#define tcgetattr(x,y) not_here("tcgetattr")
#define tcsetattr(x,y,z) not_here("tcsetattr")
#endif

/* Possibly needed prototypes */
char *cuserid (char *);
#ifndef WIN32
double strtod (const char *, char **);
long strtol (const char *, char **, int);
unsigned long strtoul (const char *, char **, int);
#endif

#ifndef HAS_CUSERID
#define cuserid(a) (char *) not_here("cuserid")
#endif
#ifndef HAS_DIFFTIME
#ifndef difftime
#define difftime(a,b) not_here("difftime")
#endif
#endif
#ifndef HAS_FPATHCONF
#define fpathconf(f,n) 	(SysRetLong) not_here("fpathconf")
#endif
#ifndef HAS_MKTIME
#define mktime(a) not_here("mktime")
#endif
#ifndef HAS_NICE
#define nice(a) not_here("nice")
#endif
#ifndef HAS_PATHCONF
#define pathconf(f,n) 	(SysRetLong) not_here("pathconf")
#endif
#ifndef HAS_SYSCONF
#define sysconf(n) 	(SysRetLong) not_here("sysconf")
#endif
#ifndef HAS_READLINK
#define readlink(a,b,c) not_here("readlink")
#endif
#ifndef HAS_SETPGID
#define setpgid(a,b) not_here("setpgid")
#endif
#ifndef HAS_SETSID
#define setsid() not_here("setsid")
#endif
#ifndef HAS_STRCOLL
#define strcoll(s1,s2) not_here("strcoll")
#endif
#ifndef HAS_STRTOD
#define strtod(s1,s2) not_here("strtod")
#endif
#ifndef HAS_STRTOL
#define strtol(s1,s2,b) not_here("strtol")
#endif
#ifndef HAS_STRTOUL
#define strtoul(s1,s2,b) not_here("strtoul")
#endif
#ifndef HAS_STRXFRM
#define strxfrm(s1,s2,n) not_here("strxfrm")
#endif
#ifndef HAS_TCGETPGRP
#define tcgetpgrp(a) not_here("tcgetpgrp")
#endif
#ifndef HAS_TCSETPGRP
#define tcsetpgrp(a,b) not_here("tcsetpgrp")
#endif
#ifndef HAS_TIMES
#ifndef NETWARE
#define times(a) not_here("times")
#endif	/* NETWARE */
#endif
#ifndef HAS_UNAME
#define uname(a) not_here("uname")
#endif
#ifndef HAS_WAITPID
#define waitpid(a,b,c) not_here("waitpid")
#endif

#ifndef HAS_MBLEN
#ifndef mblen
#define mblen(a,b) not_here("mblen")
#endif
#endif
#ifndef HAS_MBSTOWCS
#define mbstowcs(s, pwcs, n) not_here("mbstowcs")
#endif
#ifndef HAS_MBTOWC
#define mbtowc(pwc, s, n) not_here("mbtowc")
#endif
#ifndef HAS_WCSTOMBS
#define wcstombs(s, pwcs, n) not_here("wcstombs")
#endif
#ifndef HAS_WCTOMB
#define wctomb(s, wchar) not_here("wcstombs")
#endif
#if !defined(HAS_MBLEN) && !defined(HAS_MBSTOWCS) && !defined(HAS_MBTOWC) && !defined(HAS_WCSTOMBS) && !defined(HAS_WCTOMB)
/* If we don't have these functions, then we wouldn't have gotten a typedef
   for wchar_t, the wide character type.  Defining wchar_t allows the
   functions referencing it to compile.  Its actual type is then meaningless,
   since without the above functions, all sections using it end up calling
   not_here() and croak.  --Kaveh Ghazi (ghazi@noc.rutgers.edu) 9/18/94. */
#ifndef wchar_t
#define wchar_t char
#endif
#endif

#ifndef HAS_LOCALECONV
#define localeconv() not_here("localeconv")
#endif

#ifdef HAS_LONG_DOUBLE
#  if LONG_DOUBLESIZE > NVSIZE
#    undef HAS_LONG_DOUBLE  /* XXX until we figure out how to use them */
#  endif
#endif

#ifndef HAS_LONG_DOUBLE
#ifdef LDBL_MAX
#undef LDBL_MAX
#endif
#ifdef LDBL_MIN
#undef LDBL_MIN
#endif
#ifdef LDBL_EPSILON
#undef LDBL_EPSILON
#endif
#endif

/* Background: in most systems the low byte of the wait status
 * is the signal (the lowest 7 bits) and the coredump flag is
 * the eight bit, and the second lowest byte is the exit status.
 * BeOS bucks the trend and has the bytes in different order.
 * See beos/beos.c for how the reality is bent even in BeOS
 * to follow the traditional.  However, to make the POSIX
 * wait W*() macros to work in BeOS, we need to unbend the
 * reality back in place. --jhi */
#ifdef __BEOS__
#    define WMUNGE(x) (((x) & 0xFF00) >> 8 | ((x) & 0x00FF) << 8)
#else
#    define WMUNGE(x) (x)
#endif

static int
not_here(char *s)
{
    croak("POSIX::%s not implemented on this architecture", s);
    return -1;
}

#include "const-c.inc"

/* These were implemented in the old "constant" subroutine. They are actually
   macros that take an integer argument and return an integer result.  */
static int
int_macro_int (const char *name, STRLEN len, IV *arg_result) {
  /* Initially switch on the length of the name.  */
  /* This code has been edited from a "constant" function generated by:

use ExtUtils::Constant qw (constant_types C_constant XS_constant);

my $types = {map {($_, 1)} qw(IV)};
my @names = (qw(S_ISBLK S_ISCHR S_ISDIR S_ISFIFO S_ISREG WEXITSTATUS WIFEXITED
	       WIFSIGNALED WIFSTOPPED WSTOPSIG WTERMSIG));

print constant_types(); # macro defs
foreach (C_constant ("POSIX", 'int_macro_int', 'IV', $types, undef, 5, @names) ) {
    print $_, "\n"; # C constant subs
}
print "#### XS Section:\n";
print XS_constant ("POSIX", $types);
__END__
   */

  switch (len) {
  case 7:
    /* Names all of length 7.  */
    /* S_ISBLK S_ISCHR S_ISDIR S_ISREG */
    /* Offset 5 gives the best switch position.  */
    switch (name[5]) {
    case 'E':
      if (memEQ(name, "S_ISREG", 7)) {
      /*                    ^       */
#ifdef S_ISREG
        *arg_result = S_ISREG(*arg_result);
        return PERL_constant_ISIV;
#else
        return PERL_constant_NOTDEF;
#endif
      }
      break;
    case 'H':
      if (memEQ(name, "S_ISCHR", 7)) {
      /*                    ^       */
#ifdef S_ISCHR
        *arg_result = S_ISCHR(*arg_result);
        return PERL_constant_ISIV;
#else
        return PERL_constant_NOTDEF;
#endif
      }
      break;
    case 'I':
      if (memEQ(name, "S_ISDIR", 7)) {
      /*                    ^       */
#ifdef S_ISDIR
        *arg_result = S_ISDIR(*arg_result);
        return PERL_constant_ISIV;
#else
        return PERL_constant_NOTDEF;
#endif
      }
      break;
    case 'L':
      if (memEQ(name, "S_ISBLK", 7)) {
      /*                    ^       */
#ifdef S_ISBLK
        *arg_result = S_ISBLK(*arg_result);
        return PERL_constant_ISIV;
#else
        return PERL_constant_NOTDEF;
#endif
      }
      break;
    }
    break;
  case 8:
    /* Names all of length 8.  */
    /* S_ISFIFO WSTOPSIG WTERMSIG */
    /* Offset 3 gives the best switch position.  */
    switch (name[3]) {
    case 'O':
      if (memEQ(name, "WSTOPSIG", 8)) {
      /*                  ^          */
#ifdef WSTOPSIG
        int i = *arg_result;
        *arg_result = WSTOPSIG(WMUNGE(i));
        return PERL_constant_ISIV;
#else
        return PERL_constant_NOTDEF;
#endif
      }
      break;
    case 'R':
      if (memEQ(name, "WTERMSIG", 8)) {
      /*                  ^          */
#ifdef WTERMSIG
        int i = *arg_result;
        *arg_result = WTERMSIG(WMUNGE(i));
        return PERL_constant_ISIV;
#else
        return PERL_constant_NOTDEF;
#endif
      }
      break;
    case 'S':
      if (memEQ(name, "S_ISFIFO", 8)) {
      /*                  ^          */
#ifdef S_ISFIFO
        *arg_result = S_ISFIFO(*arg_result);
        return PERL_constant_ISIV;
#else
        return PERL_constant_NOTDEF;
#endif
      }
      break;
    }
    break;
  case 9:
    if (memEQ(name, "WIFEXITED", 9)) {
#ifdef WIFEXITED
      int i = *arg_result;
      *arg_result = WIFEXITED(WMUNGE(i));
      return PERL_constant_ISIV;
#else
      return PERL_constant_NOTDEF;
#endif
    }
    break;
  case 10:
    if (memEQ(name, "WIFSTOPPED", 10)) {
#ifdef WIFSTOPPED
      int i = *arg_result;
      *arg_result = WIFSTOPPED(WMUNGE(i));
      return PERL_constant_ISIV;
#else
      return PERL_constant_NOTDEF;
#endif
    }
    break;
  case 11:
    /* Names all of length 11.  */
    /* WEXITSTATUS WIFSIGNALED */
    /* Offset 1 gives the best switch position.  */
    switch (name[1]) {
    case 'E':
      if (memEQ(name, "WEXITSTATUS", 11)) {
      /*                ^                */
#ifdef WEXITSTATUS
	int i = *arg_result;
        *arg_result = WEXITSTATUS(WMUNGE(i));
        return PERL_constant_ISIV;
#else
        return PERL_constant_NOTDEF;
#endif
      }
      break;
    case 'I':
      if (memEQ(name, "WIFSIGNALED", 11)) {
      /*                ^                */
#ifdef WIFSIGNALED
	int i = *arg_result;
        *arg_result = WIFSIGNALED(WMUNGE(i));
        return PERL_constant_ISIV;
#else
        return PERL_constant_NOTDEF;
#endif
      }
      break;
    }
    break;
  }
  return PERL_constant_NOTFOUND;
}

static void
restore_sigmask(pTHX_ SV *osset_sv)
{
     /* Fortunately, restoring the signal mask can't fail, because
      * there's nothing we can do about it if it does -- we're not
      * supposed to return -1 from sigaction unless the disposition
      * was unaffected.
      */
     sigset_t *ossetp = (sigset_t *) SvPV_nolen( osset_sv );
     (void)sigprocmask(SIG_SETMASK, ossetp, (sigset_t *)0);
}

MODULE = SigSet		PACKAGE = POSIX::SigSet		PREFIX = sig

POSIX::SigSet
new(packname = "POSIX::SigSet", ...)
    char *		packname
    CODE:
	{
	    int i;
	    New(0, RETVAL, 1, sigset_t);
	    sigemptyset(RETVAL);
	    for (i = 1; i < items; i++)
		sigaddset(RETVAL, SvIV(ST(i)));
	}
    OUTPUT:
	RETVAL

void
DESTROY(sigset)
	POSIX::SigSet	sigset
    CODE:
	Safefree(sigset);

SysRet
sigaddset(sigset, sig)
	POSIX::SigSet	sigset
	int		sig

SysRet
sigdelset(sigset, sig)
	POSIX::SigSet	sigset
	int		sig

SysRet
sigemptyset(sigset)
	POSIX::SigSet	sigset

SysRet
sigfillset(sigset)
	POSIX::SigSet	sigset

int
sigismember(sigset, sig)
	POSIX::SigSet	sigset
	int		sig


MODULE = Termios	PACKAGE = POSIX::Termios	PREFIX = cf

POSIX::Termios
new(packname = "POSIX::Termios", ...)
    char *		packname
    CODE:
	{
#ifdef I_TERMIOS
	    New(0, RETVAL, 1, struct termios);
#else
	    not_here("termios");
        RETVAL = 0;
#endif
	}
    OUTPUT:
	RETVAL

void
DESTROY(termios_ref)
	POSIX::Termios	termios_ref
    CODE:
#ifdef I_TERMIOS
	Safefree(termios_ref);
#else
	    not_here("termios");
#endif

SysRet
getattr(termios_ref, fd = 0)
	POSIX::Termios	termios_ref
	int		fd
    CODE:
	RETVAL = tcgetattr(fd, termios_ref);
    OUTPUT:
	RETVAL

SysRet
setattr(termios_ref, fd = 0, optional_actions = 0)
	POSIX::Termios	termios_ref
	int		fd
	int		optional_actions
    CODE:
	RETVAL = tcsetattr(fd, optional_actions, termios_ref);
    OUTPUT:
	RETVAL

speed_t
cfgetispeed(termios_ref)
	POSIX::Termios	termios_ref

speed_t
cfgetospeed(termios_ref)
	POSIX::Termios	termios_ref

tcflag_t
getiflag(termios_ref)
	POSIX::Termios	termios_ref
    CODE:
#ifdef I_TERMIOS /* References a termios structure member so ifdef it out. */
	RETVAL = termios_ref->c_iflag;
#else
     not_here("getiflag");
     RETVAL = 0;
#endif
    OUTPUT:
	RETVAL

tcflag_t
getoflag(termios_ref)
	POSIX::Termios	termios_ref
    CODE:
#ifdef I_TERMIOS /* References a termios structure member so ifdef it out. */
	RETVAL = termios_ref->c_oflag;
#else
     not_here("getoflag");
     RETVAL = 0;
#endif
    OUTPUT:
	RETVAL

tcflag_t
getcflag(termios_ref)
	POSIX::Termios	termios_ref
    CODE:
#ifdef I_TERMIOS /* References a termios structure member so ifdef it out. */
	RETVAL = termios_ref->c_cflag;
#else
     not_here("getcflag");
     RETVAL = 0;
#endif
    OUTPUT:
	RETVAL

tcflag_t
getlflag(termios_ref)
	POSIX::Termios	termios_ref
    CODE:
#ifdef I_TERMIOS /* References a termios structure member so ifdef it out. */
	RETVAL = termios_ref->c_lflag;
#else
     not_here("getlflag");
     RETVAL = 0;
#endif
    OUTPUT:
	RETVAL

cc_t
getcc(termios_ref, ccix)
	POSIX::Termios	termios_ref
	int		ccix
    CODE:
#ifdef I_TERMIOS /* References a termios structure member so ifdef it out. */
	if (ccix >= NCCS)
	    croak("Bad getcc subscript");
	RETVAL = termios_ref->c_cc[ccix];
#else
     not_here("getcc");
     RETVAL = 0;
#endif
    OUTPUT:
	RETVAL

SysRet
cfsetispeed(termios_ref, speed)
	POSIX::Termios	termios_ref
	speed_t		speed

SysRet
cfsetospeed(termios_ref, speed)
	POSIX::Termios	termios_ref
	speed_t		speed

void
setiflag(termios_ref, iflag)
	POSIX::Termios	termios_ref
	tcflag_t	iflag
    CODE:
#ifdef I_TERMIOS /* References a termios structure member so ifdef it out. */
	termios_ref->c_iflag = iflag;
#else
	    not_here("setiflag");
#endif

void
setoflag(termios_ref, oflag)
	POSIX::Termios	termios_ref
	tcflag_t	oflag
    CODE:
#ifdef I_TERMIOS /* References a termios structure member so ifdef it out. */
	termios_ref->c_oflag = oflag;
#else
	    not_here("setoflag");
#endif

void
setcflag(termios_ref, cflag)
	POSIX::Termios	termios_ref
	tcflag_t	cflag
    CODE:
#ifdef I_TERMIOS /* References a termios structure member so ifdef it out. */
	termios_ref->c_cflag = cflag;
#else
	    not_here("setcflag");
#endif

void
setlflag(termios_ref, lflag)
	POSIX::Termios	termios_ref
	tcflag_t	lflag
    CODE:
#ifdef I_TERMIOS /* References a termios structure member so ifdef it out. */
	termios_ref->c_lflag = lflag;
#else
	    not_here("setlflag");
#endif

void
setcc(termios_ref, ccix, cc)
	POSIX::Termios	termios_ref
	int		ccix
	cc_t		cc
    CODE:
#ifdef I_TERMIOS /* References a termios structure member so ifdef it out. */
	if (ccix >= NCCS)
	    croak("Bad setcc subscript");
	termios_ref->c_cc[ccix] = cc;
#else
	    not_here("setcc");
#endif


MODULE = POSIX		PACKAGE = POSIX

INCLUDE: const-xs.inc

void
int_macro_int(sv, iv)
    PREINIT:
	dXSTARG;
	STRLEN		len;
        int		type;
    INPUT:
	SV *		sv;
        const char *	s = SvPV(sv, len);
	IV		iv;
    PPCODE:
        /* Change this to int_macro_int(s, len, &iv, &nv);
           if you need to return both NVs and IVs */
	type = int_macro_int(s, len, &iv);
      /* Return 1 or 2 items. First is error message, or undef if no error.
           Second, if present, is found value */
        switch (type) {
        case PERL_constant_NOTFOUND:
          sv = sv_2mortal(newSVpvf("%s is not a valid POSIX macro", s));
          EXTEND(SP, 1);
          PUSHs(&PL_sv_undef);
          PUSHs(sv);
          break;
        case PERL_constant_NOTDEF:
          sv = sv_2mortal(newSVpvf(
	    "Your vendor has not defined POSIX macro %s, used", s));
          EXTEND(SP, 1);
          PUSHs(&PL_sv_undef);
          PUSHs(sv);
          break;
        case PERL_constant_ISIV:
          PUSHi(iv);
          break;
        default:
          sv = sv_2mortal(newSVpvf(
	    "Unexpected return type %d while processing POSIX macro %s, used",
               type, s));
          EXTEND(SP, 1);
          PUSHs(&PL_sv_undef);
          PUSHs(sv);
        }

int
isalnum(charstring)
	SV *	charstring
    PREINIT:
	STRLEN	len;
    CODE:
	unsigned char *s = (unsigned char *) SvPV(charstring, len);
	unsigned char *e = s + len;
	for (RETVAL = 1; RETVAL && s < e; s++)
	    if (!isalnum(*s))
		RETVAL = 0;
    OUTPUT:
	RETVAL

int
isalpha(charstring)
	SV *	charstring
    PREINIT:
	STRLEN	len;
    CODE:
	unsigned char *s = (unsigned char *) SvPV(charstring, len);
	unsigned char *e = s + len;
	for (RETVAL = 1; RETVAL && s < e; s++)
	    if (!isalpha(*s))
		RETVAL = 0;
    OUTPUT:
	RETVAL

int
iscntrl(charstring)
	SV *	charstring
    PREINIT:
	STRLEN	len;
    CODE:
	unsigned char *s = (unsigned char *) SvPV(charstring, len);
	unsigned char *e = s + len;
	for (RETVAL = 1; RETVAL && s < e; s++)
	    if (!iscntrl(*s))
		RETVAL = 0;
    OUTPUT:
	RETVAL

int
isdigit(charstring)
	SV *	charstring
    PREINIT:
	STRLEN	len;
    CODE:
	unsigned char *s = (unsigned char *) SvPV(charstring, len);
	unsigned char *e = s + len;
	for (RETVAL = 1; RETVAL && s < e; s++)
	    if (!isdigit(*s))
		RETVAL = 0;
    OUTPUT:
	RETVAL

int
isgraph(charstring)
	SV *	charstring
    PREINIT:
	STRLEN	len;
    CODE:
	unsigned char *s = (unsigned char *) SvPV(charstring, len);
	unsigned char *e = s + len;
	for (RETVAL = 1; RETVAL && s < e; s++)
	    if (!isgraph(*s))
		RETVAL = 0;
    OUTPUT:
	RETVAL

int
islower(charstring)
	SV *	charstring
    PREINIT:
	STRLEN	len;
    CODE:
	unsigned char *s = (unsigned char *) SvPV(charstring, len);
	unsigned char *e = s + len;
	for (RETVAL = 1; RETVAL && s < e; s++)
	    if (!islower(*s))
		RETVAL = 0;
    OUTPUT:
	RETVAL

int
isprint(charstring)
	SV *	charstring
    PREINIT:
	STRLEN	len;
    CODE:
	unsigned char *s = (unsigned char *) SvPV(charstring, len);
	unsigned char *e = s + len;
	for (RETVAL = 1; RETVAL && s < e; s++)
	    if (!isprint(*s))
		RETVAL = 0;
    OUTPUT:
	RETVAL

int
ispunct(charstring)
	SV *	charstring
    PREINIT:
	STRLEN	len;
    CODE:
	unsigned char *s = (unsigned char *) SvPV(charstring, len);
	unsigned char *e = s + len;
	for (RETVAL = 1; RETVAL && s < e; s++)
	    if (!ispunct(*s))
		RETVAL = 0;
    OUTPUT:
	RETVAL

int
isspace(charstring)
	SV *	charstring
    PREINIT:
	STRLEN	len;
    CODE:
	unsigned char *s = (unsigned char *) SvPV(charstring, len);
	unsigned char *e = s + len;
	for (RETVAL = 1; RETVAL && s < e; s++)
	    if (!isspace(*s))
		RETVAL = 0;
    OUTPUT:
	RETVAL

int
isupper(charstring)
	SV *	charstring
    PREINIT:
	STRLEN	len;
    CODE:
	unsigned char *s = (unsigned char *) SvPV(charstring, len);
	unsigned char *e = s + len;
	for (RETVAL = 1; RETVAL && s < e; s++)
	    if (!isupper(*s))
		RETVAL = 0;
    OUTPUT:
	RETVAL

int
isxdigit(charstring)
	SV *	charstring
    PREINIT:
	STRLEN	len;
    CODE:
	unsigned char *s = (unsigned char *) SvPV(charstring, len);
	unsigned char *e = s + len;
	for (RETVAL = 1; RETVAL && s < e; s++)
	    if (!isxdigit(*s))
		RETVAL = 0;
    OUTPUT:
	RETVAL

SysRet
open(filename, flags = O_RDONLY, mode = 0666)
	char *		filename
	int		flags
	Mode_t		mode
    CODE:
	if (flags & (O_APPEND|O_CREAT|O_TRUNC|O_RDWR|O_WRONLY|O_EXCL))
	    TAINT_PROPER("open");
	RETVAL = open(filename, flags, mode);
    OUTPUT:
	RETVAL


HV *
localeconv()
    CODE:
#ifdef HAS_LOCALECONV
	struct lconv *lcbuf;
	RETVAL = newHV();
	if ((lcbuf = localeconv())) {
	    /* the strings */
	    if (lcbuf->decimal_point && *lcbuf->decimal_point)
		hv_store(RETVAL, "decimal_point", 13,
		    newSVpv(lcbuf->decimal_point, 0), 0);
	    if (lcbuf->thousands_sep && *lcbuf->thousands_sep)
		hv_store(RETVAL, "thousands_sep", 13,
		    newSVpv(lcbuf->thousands_sep, 0), 0);
#ifndef NO_LOCALECONV_GROUPING
	    if (lcbuf->grouping && *lcbuf->grouping)
		hv_store(RETVAL, "grouping", 8,
		    newSVpv(lcbuf->grouping, 0), 0);
#endif
	    if (lcbuf->int_curr_symbol && *lcbuf->int_curr_symbol)
		hv_store(RETVAL, "int_curr_symbol", 15,
		    newSVpv(lcbuf->int_curr_symbol, 0), 0);
	    if (lcbuf->currency_symbol && *lcbuf->currency_symbol)
		hv_store(RETVAL, "currency_symbol", 15,
		    newSVpv(lcbuf->currency_symbol, 0), 0);
	    if (lcbuf->mon_decimal_point && *lcbuf->mon_decimal_point)
		hv_store(RETVAL, "mon_decimal_point", 17,
		    newSVpv(lcbuf->mon_decimal_point, 0), 0);
#ifndef NO_LOCALECONV_MON_THOUSANDS_SEP
	    if (lcbuf->mon_thousands_sep && *lcbuf->mon_thousands_sep)
		hv_store(RETVAL, "mon_thousands_sep", 17,
		    newSVpv(lcbuf->mon_thousands_sep, 0), 0);
#endif                    
#ifndef NO_LOCALECONV_MON_GROUPING
	    if (lcbuf->mon_grouping && *lcbuf->mon_grouping)
		hv_store(RETVAL, "mon_grouping", 12,
		    newSVpv(lcbuf->mon_grouping, 0), 0);
#endif
	    if (lcbuf->positive_sign && *lcbuf->positive_sign)
		hv_store(RETVAL, "positive_sign", 13,
		    newSVpv(lcbuf->positive_sign, 0), 0);
	    if (lcbuf->negative_sign && *lcbuf->negative_sign)
		hv_store(RETVAL, "negative_sign", 13,
		    newSVpv(lcbuf->negative_sign, 0), 0);
	    /* the integers */
	    if (lcbuf->int_frac_digits != CHAR_MAX)
		hv_store(RETVAL, "int_frac_digits", 15,
		    newSViv(lcbuf->int_frac_digits), 0);
	    if (lcbuf->frac_digits != CHAR_MAX)
		hv_store(RETVAL, "frac_digits", 11,
		    newSViv(lcbuf->frac_digits), 0);
	    if (lcbuf->p_cs_precedes != CHAR_MAX)
		hv_store(RETVAL, "p_cs_precedes", 13,
		    newSViv(lcbuf->p_cs_precedes), 0);
	    if (lcbuf->p_sep_by_space != CHAR_MAX)
		hv_store(RETVAL, "p_sep_by_space", 14,
		    newSViv(lcbuf->p_sep_by_space), 0);
	    if (lcbuf->n_cs_precedes != CHAR_MAX)
		hv_store(RETVAL, "n_cs_precedes", 13,
		    newSViv(lcbuf->n_cs_precedes), 0);
	    if (lcbuf->n_sep_by_space != CHAR_MAX)
		hv_store(RETVAL, "n_sep_by_space", 14,
		    newSViv(lcbuf->n_sep_by_space), 0);
	    if (lcbuf->p_sign_posn != CHAR_MAX)
		hv_store(RETVAL, "p_sign_posn", 11,
		    newSViv(lcbuf->p_sign_posn), 0);
	    if (lcbuf->n_sign_posn != CHAR_MAX)
		hv_store(RETVAL, "n_sign_posn", 11,
		    newSViv(lcbuf->n_sign_posn), 0);
	}
#else
	localeconv(); /* A stub to call not_here(). */
#endif
    OUTPUT:
	RETVAL

char *
setlocale(category, locale = 0)
	int		category
	char *		locale
    CODE:
	RETVAL = setlocale(category, locale);
	if (RETVAL) {
#ifdef USE_LOCALE_CTYPE
	    if (category == LC_CTYPE
#ifdef LC_ALL
		|| category == LC_ALL
#endif
		)
	    {
		char *newctype;
#ifdef LC_ALL
		if (category == LC_ALL)
		    newctype = setlocale(LC_CTYPE, NULL);
		else
#endif
		    newctype = RETVAL;
		new_ctype(newctype);
	    }
#endif /* USE_LOCALE_CTYPE */
#ifdef USE_LOCALE_COLLATE
	    if (category == LC_COLLATE
#ifdef LC_ALL
		|| category == LC_ALL
#endif
		)
	    {
		char *newcoll;
#ifdef LC_ALL
		if (category == LC_ALL)
		    newcoll = setlocale(LC_COLLATE, NULL);
		else
#endif
		    newcoll = RETVAL;
		new_collate(newcoll);
	    }
#endif /* USE_LOCALE_COLLATE */
#ifdef USE_LOCALE_NUMERIC
	    if (category == LC_NUMERIC
#ifdef LC_ALL
		|| category == LC_ALL
#endif
		)
	    {
		char *newnum;
#ifdef LC_ALL
		if (category == LC_ALL)
		    newnum = setlocale(LC_NUMERIC, NULL);
		else
#endif
		    newnum = RETVAL;
		new_numeric(newnum);
	    }
#endif /* USE_LOCALE_NUMERIC */
	}
    OUTPUT:
	RETVAL


NV
acos(x)
	NV		x

NV
asin(x)
	NV		x

NV
atan(x)
	NV		x

NV
ceil(x)
	NV		x

NV
cosh(x)
	NV		x

NV
floor(x)
	NV		x

NV
fmod(x,y)
	NV		x
	NV		y

void
frexp(x)
	NV		x
    PPCODE:
	int expvar;
	/* (We already know stack is long enough.) */
	PUSHs(sv_2mortal(newSVnv(frexp(x,&expvar))));
	PUSHs(sv_2mortal(newSViv(expvar)));

NV
ldexp(x,exp)
	NV		x
	int		exp

NV
log10(x)
	NV		x

void
modf(x)
	NV		x
    PPCODE:
	NV intvar;
	/* (We already know stack is long enough.) */
	PUSHs(sv_2mortal(newSVnv(Perl_modf(x,&intvar))));
	PUSHs(sv_2mortal(newSVnv(intvar)));

NV
sinh(x)
	NV		x

NV
tan(x)
	NV		x

NV
tanh(x)
	NV		x

SysRet
sigaction(sig, optaction, oldaction = 0)
	int			sig
	SV *			optaction
	POSIX::SigAction	oldaction
    CODE:
#if defined(WIN32) || defined(NETWARE)
	RETVAL = not_here("sigaction");
#else
# This code is really grody because we're trying to make the signal
# interface look beautiful, which is hard.

	{
	    POSIX__SigAction action;
	    GV *siggv = gv_fetchpv("SIG", TRUE, SVt_PVHV);
	    struct sigaction act;
	    struct sigaction oact;
	    sigset_t sset;
	    SV *osset_sv;
	    sigset_t osset;
	    POSIX__SigSet sigset;
	    SV** svp;
	    SV** sigsvp;
	    if (sig == 0 && SvPOK(ST(0))) {
	        char *s = SvPVX(ST(0));
		int i = whichsig(s);

	        if (i < 0 && memEQ(s, "SIG", 3))
		    i = whichsig(s + 3);
	        if (i < 0) {
	            if (ckWARN(WARN_SIGNAL))
		        Perl_warner(aTHX_ packWARN(WARN_SIGNAL),
                                    "No such signal: SIG%s", s);
	            XSRETURN_UNDEF;
		}
	        else
		    sig = i;
            }
	    sigsvp = hv_fetch(GvHVn(siggv),
			      PL_sig_name[sig],
			      strlen(PL_sig_name[sig]),
			      TRUE);

	    /* Check optaction and set action */
	    if(SvTRUE(optaction)) {
		if(sv_isa(optaction, "POSIX::SigAction"))
			action = (HV*)SvRV(optaction);
		else
			croak("action is not of type POSIX::SigAction");
	    }
	    else {
		action=0;
	    }

	    /* sigaction() is supposed to look atomic. In particular, any
	     * signal handler invoked during a sigaction() call should
	     * see either the old or the new disposition, and not something
	     * in between. We use sigprocmask() to make it so.
	     */
	    sigfillset(&sset);
	    RETVAL=sigprocmask(SIG_BLOCK, &sset, &osset);
	    if(RETVAL == -1)
               XSRETURN_UNDEF;
	    ENTER;
	    /* Restore signal mask no matter how we exit this block. */
	    osset_sv = newSVpv((char *)(&osset), sizeof(sigset_t));
	    SAVEFREESV( osset_sv );
	    SAVEDESTRUCTOR_X(restore_sigmask, osset_sv);

	    RETVAL=-1; /* In case both oldaction and action are 0. */

	    /* Remember old disposition if desired. */
	    if (oldaction) {
		svp = hv_fetch(oldaction, "HANDLER", 7, TRUE);
		if(!svp)
		    croak("Can't supply an oldaction without a HANDLER");
		if(SvTRUE(*sigsvp)) { /* TBD: what if "0"? */
			sv_setsv(*svp, *sigsvp);
		}
		else {
			sv_setpv(*svp, "DEFAULT");
		}
		RETVAL = sigaction(sig, (struct sigaction *)0, & oact);
		if(RETVAL == -1)
                   XSRETURN_UNDEF;
		/* Get back the mask. */
		svp = hv_fetch(oldaction, "MASK", 4, TRUE);
		if (sv_isa(*svp, "POSIX::SigSet")) {
		    IV tmp = SvIV((SV*)SvRV(*svp));
		    sigset = INT2PTR(sigset_t*, tmp);
		}
		else {
		    New(0, sigset, 1, sigset_t);
		    sv_setptrobj(*svp, sigset, "POSIX::SigSet");
		}
		*sigset = oact.sa_mask;

		/* Get back the flags. */
		svp = hv_fetch(oldaction, "FLAGS", 5, TRUE);
		sv_setiv(*svp, oact.sa_flags);

		/* Get back whether the old handler used safe signals. */
		svp = hv_fetch(oldaction, "SAFE", 4, TRUE);
		sv_setiv(*svp, oact.sa_handler == PL_csighandlerp);
	    }

	    if (action) {
		/* Safe signals use "csighandler", which vectors through the
		   PL_sighandlerp pointer when it's safe to do so.
		   (BTW, "csighandler" is very different from "sighandler".) */
		svp = hv_fetch(action, "SAFE", 4, FALSE);
		act.sa_handler = (*svp && SvTRUE(*svp))
				 ? PL_csighandlerp : PL_sighandlerp;

		/* Vector new Perl handler through %SIG.
		   (The core signal handlers read %SIG to dispatch.) */
		svp = hv_fetch(action, "HANDLER", 7, FALSE);
		if (!svp)
		    croak("Can't supply an action without a HANDLER");
		sv_setsv(*sigsvp, *svp);

		/* This call actually calls sigaction() with almost the
		   right settings, including appropriate interpretation
		   of DEFAULT and IGNORE.  However, why are we doing
		   this when we're about to do it again just below?  XXX */
		mg_set(*sigsvp);

		/* And here again we duplicate -- DEFAULT/IGNORE checking. */
		if(SvPOK(*svp)) {
			char *s=SvPVX(*svp);
			if(strEQ(s,"IGNORE")) {
				act.sa_handler = SIG_IGN;
			}
			else if(strEQ(s,"DEFAULT")) {
				act.sa_handler = SIG_DFL;
			}
		}

		/* Set up any desired mask. */
		svp = hv_fetch(action, "MASK", 4, FALSE);
		if (svp && sv_isa(*svp, "POSIX::SigSet")) {
		    IV tmp = SvIV((SV*)SvRV(*svp));
		    sigset = INT2PTR(sigset_t*, tmp);
		    act.sa_mask = *sigset;
		}
		else
		    sigemptyset(& act.sa_mask);

		/* Set up any desired flags. */
		svp = hv_fetch(action, "FLAGS", 5, FALSE);
		act.sa_flags = svp ? SvIV(*svp) : 0;

		/* Don't worry about cleaning up *sigsvp if this fails,
		 * because that means we tried to disposition a
		 * nonblockable signal, in which case *sigsvp is
		 * essentially meaningless anyway.
		 */
		RETVAL = sigaction(sig, & act, (struct sigaction *)0);
               if(RETVAL == -1)
                   XSRETURN_UNDEF;
	    }

	    LEAVE;
	}
#endif
    OUTPUT:
	RETVAL

SysRet
sigpending(sigset)
	POSIX::SigSet		sigset

SysRet
sigprocmask(how, sigset, oldsigset = 0)
	int			how
	POSIX::SigSet		sigset
	POSIX::SigSet		oldsigset = NO_INIT
INIT:
	if ( items < 3 ) {
	    oldsigset = 0;
	}
	else if (sv_derived_from(ST(2), "POSIX::SigSet")) {
	    IV tmp = SvIV((SV*)SvRV(ST(2)));
	    oldsigset = INT2PTR(POSIX__SigSet,tmp);
	}
	else {
	    New(0, oldsigset, 1, sigset_t);
	    sigemptyset(oldsigset);
	    sv_setref_pv(ST(2), "POSIX::SigSet", (void*)oldsigset);
	}

SysRet
sigsuspend(signal_mask)
	POSIX::SigSet		signal_mask

void
_exit(status)
	int		status

SysRet
close(fd)
	int		fd

SysRet
dup(fd)
	int		fd

SysRet
dup2(fd1, fd2)
	int		fd1
	int		fd2

SV *
lseek(fd, offset, whence)
	int		fd
	Off_t		offset
	int		whence
    CODE:
	Off_t pos = PerlLIO_lseek(fd, offset, whence);
	RETVAL = sizeof(Off_t) > sizeof(IV)
		 ? newSVnv((NV)pos) : newSViv((IV)pos);
    OUTPUT:
	RETVAL

void
nice(incr)
	int		incr
    PPCODE:
	errno = 0;
	if ((incr = nice(incr)) != -1 || errno == 0) {
	    if (incr == 0)
		XPUSHs(sv_2mortal(newSVpvn("0 but true", 10)));
	    else
		XPUSHs(sv_2mortal(newSViv(incr)));
	}

void
pipe()
    PPCODE:
	int fds[2];
	if (pipe(fds) != -1) {
	    EXTEND(SP,2);
	    PUSHs(sv_2mortal(newSViv(fds[0])));
	    PUSHs(sv_2mortal(newSViv(fds[1])));
	}

SysRet
read(fd, buffer, nbytes)
    PREINIT:
        SV *sv_buffer = SvROK(ST(1)) ? SvRV(ST(1)) : ST(1);
    INPUT:
        int             fd
        size_t          nbytes
        char *          buffer = sv_grow( sv_buffer, nbytes+1 );
    CLEANUP:
        if (RETVAL >= 0) {
            SvCUR(sv_buffer) = RETVAL;
            SvPOK_only(sv_buffer);
            *SvEND(sv_buffer) = '\0';
            SvTAINTED_on(sv_buffer);
        }

SysRet
setpgid(pid, pgid)
	pid_t		pid
	pid_t		pgid

pid_t
setsid()

pid_t
tcgetpgrp(fd)
	int		fd

SysRet
tcsetpgrp(fd, pgrp_id)
	int		fd
	pid_t		pgrp_id

void
uname()
    PPCODE:
#ifdef HAS_UNAME
	struct utsname buf;
	if (uname(&buf) >= 0) {
	    EXTEND(SP, 5);
	    PUSHs(sv_2mortal(newSVpv(buf.sysname, 0)));
	    PUSHs(sv_2mortal(newSVpv(buf.nodename, 0)));
	    PUSHs(sv_2mortal(newSVpv(buf.release, 0)));
	    PUSHs(sv_2mortal(newSVpv(buf.version, 0)));
	    PUSHs(sv_2mortal(newSVpv(buf.machine, 0)));
	}
#else
	uname((char *) 0); /* A stub to call not_here(). */
#endif

SysRet
write(fd, buffer, nbytes)
	int		fd
	char *		buffer
	size_t		nbytes

SV *
tmpnam()
    PREINIT:
	STRLEN i;
	int len;
    CODE:
	RETVAL = newSVpvn("", 0);
	SvGROW(RETVAL, L_tmpnam);
	len = strlen(tmpnam(SvPV(RETVAL, i)));
	SvCUR_set(RETVAL, len);
    OUTPUT:
	RETVAL

void
abort()

int
mblen(s, n)
	char *		s
	size_t		n

size_t
mbstowcs(s, pwcs, n)
	wchar_t *	s
	char *		pwcs
	size_t		n

int
mbtowc(pwc, s, n)
	wchar_t *	pwc
	char *		s
	size_t		n

int
wcstombs(s, pwcs, n)
	char *		s
	wchar_t *	pwcs
	size_t		n

int
wctomb(s, wchar)
	char *		s
	wchar_t		wchar

int
strcoll(s1, s2)
	char *		s1
	char *		s2

void
strtod(str)
	char *		str
    PREINIT:
	double num;
	char *unparsed;
    PPCODE:
	SET_NUMERIC_LOCAL();
	num = strtod(str, &unparsed);
	PUSHs(sv_2mortal(newSVnv(num)));
	if (GIMME == G_ARRAY) {
	    EXTEND(SP, 1);
	    if (unparsed)
		PUSHs(sv_2mortal(newSViv(strlen(unparsed))));
	    else
		PUSHs(&PL_sv_undef);
	}

void
strtol(str, base = 0)
	char *		str
	int		base
    PREINIT:
	long num;
	char *unparsed;
    PPCODE:
	num = strtol(str, &unparsed, base);
#if IVSIZE <= LONGSIZE
	if (num < IV_MIN || num > IV_MAX)
	    PUSHs(sv_2mortal(newSVnv((double)num)));
	else
#endif
	    PUSHs(sv_2mortal(newSViv((IV)num)));
	if (GIMME == G_ARRAY) {
	    EXTEND(SP, 1);
	    if (unparsed)
		PUSHs(sv_2mortal(newSViv(strlen(unparsed))));
	    else
		PUSHs(&PL_sv_undef);
	}

void
strtoul(str, base = 0)
	char *		str
	int		base
    PREINIT:
	unsigned long num;
	char *unparsed;
    PPCODE:
	num = strtoul(str, &unparsed, base);
#if IVSIZE <= LONGSIZE
	if (num > IV_MAX)
	    PUSHs(sv_2mortal(newSVnv((double)num)));
	else
#endif
	    PUSHs(sv_2mortal(newSViv((IV)num)));
	if (GIMME == G_ARRAY) {
	    EXTEND(SP, 1);
	    if (unparsed)
		PUSHs(sv_2mortal(newSViv(strlen(unparsed))));
	    else
		PUSHs(&PL_sv_undef);
	}

void
strxfrm(src)
	SV *		src
    CODE:
	{
          STRLEN srclen;
          STRLEN dstlen;
          char *p = SvPV(src,srclen);
          srclen++;
          ST(0) = sv_2mortal(NEWSV(800,srclen*4+1));
          dstlen = strxfrm(SvPVX(ST(0)), p, (size_t)srclen);
          if (dstlen > srclen) {
              dstlen++;
              SvGROW(ST(0), dstlen);
              strxfrm(SvPVX(ST(0)), p, (size_t)dstlen);
              dstlen--;
          }
          SvCUR(ST(0)) = dstlen;
	    SvPOK_only(ST(0));
	}

SysRet
mkfifo(filename, mode)
	char *		filename
	Mode_t		mode
    CODE:
	TAINT_PROPER("mkfifo");
	RETVAL = mkfifo(filename, mode);
    OUTPUT:
	RETVAL

SysRet
tcdrain(fd)
	int		fd


SysRet
tcflow(fd, action)
	int		fd
	int		action


SysRet
tcflush(fd, queue_selector)
	int		fd
	int		queue_selector

SysRet
tcsendbreak(fd, duration)
	int		fd
	int		duration

char *
asctime(sec, min, hour, mday, mon, year, wday = 0, yday = 0, isdst = 0)
	int		sec
	int		min
	int		hour
	int		mday
	int		mon
	int		year
	int		wday
	int		yday
	int		isdst
    CODE:
	{
	    struct tm mytm;
	    init_tm(&mytm);	/* XXX workaround - see init_tm() above */
	    mytm.tm_sec = sec;
	    mytm.tm_min = min;
	    mytm.tm_hour = hour;
	    mytm.tm_mday = mday;
	    mytm.tm_mon = mon;
	    mytm.tm_year = year;
	    mytm.tm_wday = wday;
	    mytm.tm_yday = yday;
	    mytm.tm_isdst = isdst;
	    RETVAL = asctime(&mytm);
	}
    OUTPUT:
	RETVAL

long
clock()

char *
ctime(time)
	Time_t		&time

void
times()
	PPCODE:
	struct tms tms;
	clock_t realtime;
	realtime = times( &tms );
	EXTEND(SP,5);
	PUSHs( sv_2mortal( newSViv( (IV) realtime ) ) );
	PUSHs( sv_2mortal( newSViv( (IV) tms.tms_utime ) ) );
	PUSHs( sv_2mortal( newSViv( (IV) tms.tms_stime ) ) );
	PUSHs( sv_2mortal( newSViv( (IV) tms.tms_cutime ) ) );
	PUSHs( sv_2mortal( newSViv( (IV) tms.tms_cstime ) ) );

double
difftime(time1, time2)
	Time_t		time1
	Time_t		time2

SysRetLong
mktime(sec, min, hour, mday, mon, year, wday = 0, yday = 0, isdst = 0)
	int		sec
	int		min
	int		hour
	int		mday
	int		mon
	int		year
	int		wday
	int		yday
	int		isdst
    CODE:
	{
	    struct tm mytm;
	    init_tm(&mytm);	/* XXX workaround - see init_tm() above */
	    mytm.tm_sec = sec;
	    mytm.tm_min = min;
	    mytm.tm_hour = hour;
	    mytm.tm_mday = mday;
	    mytm.tm_mon = mon;
	    mytm.tm_year = year;
	    mytm.tm_wday = wday;
	    mytm.tm_yday = yday;
	    mytm.tm_isdst = isdst;
	    RETVAL = mktime(&mytm);
	}
    OUTPUT:
	RETVAL

#XXX: if $xsubpp::WantOptimize is always the default
#     sv_setpv(TARG, ...) could be used rather than
#     ST(0) = sv_2mortal(newSVpv(...))
void
strftime(fmt, sec, min, hour, mday, mon, year, wday = -1, yday = -1, isdst = -1)
	char *		fmt
	int		sec
	int		min
	int		hour
	int		mday
	int		mon
	int		year
	int		wday
	int		yday
	int		isdst
    CODE:
	{
	    char *buf = my_strftime(fmt, sec, min, hour, mday, mon, year, wday, yday, isdst);
	    if (buf) {
		ST(0) = sv_2mortal(newSVpv(buf, 0));
		Safefree(buf);
	    }
	}

void
tzset()

void
tzname()
    PPCODE:
	EXTEND(SP,2);
	PUSHs(sv_2mortal(newSVpvn(tzname[0],strlen(tzname[0]))));
	PUSHs(sv_2mortal(newSVpvn(tzname[1],strlen(tzname[1]))));

SysRet
access(filename, mode)
	char *		filename
	Mode_t		mode

char *
ctermid(s = 0)
	char *		s = 0;

char *
cuserid(s = 0)
	char *		s = 0;

SysRetLong
fpathconf(fd, name)
	int		fd
	int		name

SysRetLong
pathconf(filename, name)
	char *		filename
	int		name

SysRet
pause()

SysRet
setgid(gid)
	Gid_t		gid

SysRet
setuid(uid)
	Uid_t		uid

SysRetLong
sysconf(name)
	int		name

char *
ttyname(fd)
	int		fd

void
getcwd()
    PPCODE:
      {
	dXSTARG;
	getcwd_sv(TARG);
	XSprePUSH; PUSHTARG;
      }