/* source: xio-progcall.c */
/* Copyright Gerhard Rieger 2001-2008 */
/* Published under the GNU General Public License V.2, see file COPYING */

/* this file contains common code dealing with program calls (exec, system) */

#include "xiosysincludes.h"
#include "xioopen.h"
#include "xiosigchld.h"

#include "xio-process.h"
#include "xio-progcall.h"

#include "xio-socket.h"


/* these options are used by address pty too */
#if HAVE_OPENPTY
const struct optdesc opt_openpty = { "openpty",   NULL, OPT_OPENPTY,     GROUP_PTY,   PH_BIGEN, TYPE_BOOL, 	OFUNC_SPEC };
#endif /* HAVE_OPENPTY */
#if HAVE_DEV_PTMX || HAVE_DEV_PTC
const struct optdesc opt_ptmx    = { "ptmx",      NULL, OPT_PTMX,        GROUP_PTY,   PH_BIGEN, TYPE_BOOL, 	OFUNC_SPEC };
#endif

#if WITH_EXEC || WITH_SYSTEM

#define MAXPTYNAMELEN 64

const struct optdesc opt_fdin    = { "fdin",      NULL, OPT_FDIN,        GROUP_FORK,   PH_PASTBIGEN,   TYPE_USHORT,	OFUNC_SPEC };
const struct optdesc opt_fdout   = { "fdout",     NULL, OPT_FDOUT,       GROUP_FORK,   PH_PASTBIGEN,   TYPE_USHORT,	OFUNC_SPEC };
const struct optdesc opt_path    = { "path",      NULL, OPT_PATH,        GROUP_EXEC,   PH_PREEXEC,     TYPE_STRING,	OFUNC_SPEC };
const struct optdesc opt_pipes   = { "pipes",     NULL, OPT_PIPES,       GROUP_FORK,   PH_BIGEN,       TYPE_BOOL, 	OFUNC_SPEC };
#if HAVE_PTY
const struct optdesc opt_pty     = { "pty",       NULL, OPT_PTY,         GROUP_FORK,   PH_BIGEN, TYPE_BOOL, 	OFUNC_SPEC };
#endif
const struct optdesc opt_stderr  = { "stderr",    NULL, OPT_STDERR,      GROUP_FORK,   PH_PASTFORK,        TYPE_BOOL,	OFUNC_SPEC };
const struct optdesc opt_nofork  = { "nofork",    NULL, OPT_NOFORK,      GROUP_FORK,   PH_BIGEN,       TYPE_BOOL,       OFUNC_SPEC };
const struct optdesc opt_sighup  = { "sighup",    NULL, OPT_SIGHUP,      GROUP_PARENT, PH_LATE,        TYPE_CONST,      OFUNC_SIGNAL, SIGHUP };
const struct optdesc opt_sigint  = { "sigint",    NULL, OPT_SIGINT,      GROUP_PARENT, PH_LATE,        TYPE_CONST,      OFUNC_SIGNAL, SIGINT };
const struct optdesc opt_sigquit = { "sigquit",   NULL, OPT_SIGQUIT,     GROUP_PARENT, PH_LATE,        TYPE_CONST,      OFUNC_SIGNAL, SIGQUIT };


#if 0

/* fork for exec/system, but return before exec'ing.
   return=0: is child process
   return>0: is parent process
   return<0: error occurred, assume parent process and no child exists !!!
 */
int _xioopen_foxec_int(int xioflags,	/* XIO_RDONLY etc. */
		struct single *fd,
		unsigned groups,
		   struct opt **copts,	/* in: opts; out: opts for child */
		   int *duptostderr	/* out: redirect stderr to output fd */
		) {
   struct opt *popts;	/* parent process options */
   int numleft;
   int d, sv[2], rdpip[2], wrpip[2];
   int rw = (xioflags & XIO_ACCMODE);
   bool usepipes = false;
#if HAVE_PTY
   int ptyfd = -1, ttyfd = -1;
   bool usebestpty = false;	/* use the best available way to open pty */
#if defined(HAVE_DEV_PTMX) || defined(HAVE_DEV_PTC)
   bool useptmx = false;	/* use /dev/ptmx or equivalent */
#endif
#if HAVE_OPENPTY
   bool useopenpty = false;	/* try only openpty */
#endif	/* HAVE_OPENPTY */
   bool usepty = false;		/* any of the pty options is selected */
   char ptyname[MAXPTYNAMELEN];
#endif /* HAVE_PTY */
   pid_t pid = 0;	/* mostly int */
   short fdi = 0, fdo = 1;
   short result;
   bool withstderr = false;
   bool nofork = false;
   bool withfork;

   popts = moveopts(*copts, GROUP_ALL);
   if (applyopts_single(fd, popts, PH_INIT) < 0)  return -1;
   applyopts2(-1, popts, PH_INIT, PH_EARLY);

   retropt_bool(popts, OPT_NOFORK, &nofork);
   withfork = !nofork;

   retropt_bool(popts, OPT_PIPES, &usepipes);
#if HAVE_PTY
   retropt_bool(popts, OPT_PTY, &usebestpty);
#if HAVE_OPENPTY
   retropt_bool(popts, OPT_OPENPTY, &useopenpty);
#endif
#if defined(HAVE_DEV_PTMX) || defined(HAVE_DEV_PTC)
   retropt_bool(popts, OPT_PTMX, &useptmx);
#endif
   usepty = (usebestpty
#if HAVE_OPENPTY
	     || useopenpty
#endif
#if defined(HAVE_DEV_PTMX) || defined(HAVE_DEV_PTC)
	     || useptmx
#endif
	     );
   if (usepipes && usepty) {
      Warn("_xioopen_foxec(): options \"pipes\" and \"pty\" must not be specified together; ignoring \"pipes\"");
      usepipes = false;
   }
#endif /* HAVE_PTY */
   retropt_ushort(popts, OPT_FDIN,  (unsigned short *)&fdi);
   retropt_ushort(popts, OPT_FDOUT, (unsigned short *)&fdo);

   if (rw == XIO_WRONLY) {
      if (fd->howtoclose == XIOCLOSE_UNSPEC) {
	 fd->howtoclose = XIOCLOSE_SLEEP_SIGTERM;
      }
   }
   if (withfork) {
      if (!(xioflags&XIO_MAYCHILD)) {
	 Error("cannot fork off child process here");
	 /*!! free something */
	 return -1;
      }
      fd->flags |= XIO_DOESCHILD;

#if HAVE_PTY
      Notice2("forking off child, using %s for %s",
	    &("socket\0\0pipes\0\0\0pty\0\0\0\0\0"[(usepipes<<3)|(usepty<<4)]),
	      ddirection[rw]);
#else
      Notice2("forking off child, using %s for %s",
	      &("socket\0\0pipes\0\0\0"[(usepipes<<3)]),
	      ddirection[rw]);
#endif /* HAVE_PTY */
   }
   applyopts(-1, popts, PH_PREBIGEN);

   if (!withfork) {
      /*0 struct single *stream1, *stream2;*/

      free(*copts);
      *copts = moveopts(popts, GROUP_ALL);
      /* what if WE are sock1 ? */
#if 1
      if (!(xioflags & XIO_MAYEXEC /* means exec+nofork */)) {
	 Error("nofork option is not allowed here");
	 /*!! free something */
	 return -1;
      }
      fd->flags |= XIO_DOESEXEC;
#else      /*!! */
      if (sock1 == NULL) {
	 Fatal("nofork option must no be applied to first socat address");
      }
#endif
      if (fd->howtoclose == XIOCLOSE_UNSPEC) {
	 fd->howtoclose = XIOCLOSE_CLOSE;
      }

#if 0 /*!! */
      if (sock1->tag == XIO_TAG_DUAL) {
	 stream1 = &sock1->dual.stream[0]->stream;
	 stream2 = &sock1->dual.stream[1]->stream;
      } else {
	 stream1 = &sock1->stream;
	 stream2 = &sock1->stream;
      }
      if (stream1->dtype == DATA_READLINE || stream2->dtype == DATA_READLINE ||
	  stream1->dtype == DATA_OPENSSL  || stream2->dtype == DATA_OPENSSL
	  ) {
	 Error("with option nofork, openssl and readline in address1 do not work");
      }
      if (stream1->lineterm != LINETERM_RAW ||
	  stream2->lineterm != LINETERM_RAW ||
	  stream1->ignoreeof || stream2->ignoreeof) {
	 Warn("due to option nofork, address1 options for lineterm and igoreeof do not apply");
      }
#endif

      /*! problem: when fdi==WRFD(sock[0]) or fdo==RDFD(sock[0]) */
      if (rw != XIO_WRONLY) {
	 if (XIO_GETRDFD(sock[0]/*!!*/) == fdi) {
	    if (Fcntl_l(fdi, F_SETFD, 0) < 0) {
	       Warn2("fcntl(%d, F_SETFD, 0): %s", fdi, strerror(errno));
	    }
	    if (Dup2(XIO_GETRDFD(sock[0]), fdi) < 0) {
	       Error3("dup2(%d, %d): %s",
		      XIO_GETRDFD(sock[0]), fdi, strerror(errno));
	    }
	    /*0 Info2("dup2(%d, %d)", XIO_GETRDFD(sock[0]), fdi);*/
	 } else {
	    if (Dup2(XIO_GETRDFD(sock[0]), fdi) < 0) {
	       Error3("dup2(%d, %d): %s",
		      XIO_GETRDFD(sock[0]), fdi, strerror(errno));
	    }
	    /*0 Info2("dup2(%d, %d)", XIO_GETRDFD(sock[0]), fdi);*/
	 }
      }
      if (rw != XIO_RDONLY) {
	 if (XIO_GETWRFD(sock[0]) == fdo) {
	    if (Fcntl_l(fdo, F_SETFD, 0) < 0) {
	       Warn2("fcntl(%d, F_SETFD, 0): %s", fdo, strerror(errno));
	    }
	    if (Dup2(XIO_GETWRFD(sock[0]), fdo) < 0) {
	       Error3("dup2(%d, %d): %s)",
		      XIO_GETWRFD(sock[0]), fdo, strerror(errno));
	    }
	    /*0 Info2("dup2(%d, %d)", XIO_GETWRFD(sock[0]), fdo);*/
	 } else {
	    if (Dup2(XIO_GETWRFD(sock[0]), fdo) < 0) {
	       Error3("dup2(%d, %d): %s)",
		      XIO_GETWRFD(sock[0]), fdo, strerror(errno));
	    }
	    /*0 Info2("dup2(%d, %d)", XIO_GETWRFD(sock[0]), fdo);*/
	 }
      }
   } else
#if HAVE_PTY
   if (usepty) {

#if defined(HAVE_DEV_PTMX)
#  define PTMX "/dev/ptmx"	/* Linux */
#elif HAVE_DEV_PTC
#  define PTMX "/dev/ptc"	/* AIX 4.3.3 */
#endif
      fd->dtype = XIODATA_PTY;
      if (fd->howtoshut == XIOSHUT_UNSPEC) {
	 fd->howtoshut = XIOSHUTRD_SIGTERM|XIOSHUTWR_SIGHUP;
      }
      if (fd->howtoclose == XIOCLOSE_UNSPEC) {
	 fd->howtoclose = XIOCLOSE_CLOSE_SIGTERM;
      }

#if HAVE_DEV_PTMX || HAVE_DEV_PTC
      if (usebestpty || useptmx) {
	 if ((ptyfd = Open(PTMX, O_RDWR|O_NOCTTY, 0620)) < 0) {
	    Warn1("open(\""PTMX"\", O_RDWR|O_NOCTTY, 0620): %s",
		  strerror(errno));
	    /*!*/
	 } else {
	    /*0 Info2("open(\"%s\", O_RDWR|O_NOCTTY, 0620) -> %d", PTMX, ptyfd);*/
	 }
	 if (ptyfd >= 0 && ttyfd < 0) {
	    char *tn = NULL;
	    /* we used PTMX before forking */
	    extern char *ptsname(int);
#if HAVE_GRANTPT	/* AIX, not Linux */
	    if (Grantpt(ptyfd)/*!*/ < 0) {
	       Warn2("grantpt(%d): %s", ptyfd, strerror(errno));
	    }
#endif /* HAVE_GRANTPT */
#if HAVE_UNLOCKPT
	    if (Unlockpt(ptyfd)/*!*/ < 0) {
	       Warn2("unlockpt(%d): %s", ptyfd, strerror(errno));
	    }
#endif /* HAVE_UNLOCKPT */
#if HAVE_PTSNAME	/* AIX, not Linux */
	    if ((tn = Ptsname(ptyfd)) == NULL) {
	       Warn2("ptsname(%d): %s", ptyfd, strerror(errno));
	    }
#endif /* HAVE_PTSNAME */
	    if (tn == NULL) {
	       if ((tn = Ttyname(ptyfd)) == NULL) {
		  Warn2("ttyname(%d): %s", ptyfd, strerror(errno));
	       }
	    }
	    strncpy(ptyname, tn, MAXPTYNAMELEN);	/*! ttyname_r() */
	    if ((ttyfd = Open(tn, O_RDWR|O_NOCTTY, 0620)) < 0) {
	       Warn2("open(\"%s\", O_RDWR|O_NOCTTY, 0620): %s", tn, strerror(errno));
	    } else {
	       /*0 Info2("open(\"%s\", O_RDWR|O_NOCTTY, 0620) -> %d", tn, ttyfd);*/
	    }

#ifdef I_PUSH
	    /* Linux: I_PUSH def'd; pty: ioctl(, I_FIND, ...) -> -1 EINVAL */
	    /* AIX:   I_PUSH def'd; pty: ioctl(, I_FIND, ...) -> 1 */
	    /* SunOS: I_PUSH def'd; pty: ioctl(, I_FIND, ...) -> 0 */
	    /* HP-UX: I_PUSH def'd; pty: ioctl(, I_FIND, ...) -> 0 */
	    if (Ioctl(ttyfd, I_FIND, "ldterm") == 0) {
	       Ioctl(ttyfd, I_PUSH, "ptem");		/* 0 */
	       Ioctl(ttyfd, I_PUSH, "ldterm");		/* 0 */
	       Ioctl(ttyfd, I_PUSH, "ttcompat");	/* HP-UX: -1 */
	    }
#endif

#if 0	    /* the following block need not work */

	    if (ttyfd >= 0 && ((tn = Ttyname(ttyfd)) == NULL)) {
	       Warn2("ttyname(%d): %s", ttyfd, strerror(errno));
	    }
	    if (tn == NULL) {
	       Error("could not open pty");
	       return STAT_NORETRY;
	    }
#endif
	    Info1("opened pseudo terminal %s", tn);
	 }
      }
#endif /* HAVE_DEV_PTMX || HAVE_DEV_PTC */
#if HAVE_OPENPTY
      if (ptyfd < 0) {
	 int result;
	 if ((result = Openpty(&ptyfd, &ttyfd, ptyname, NULL, NULL)) < 0) {
	    Error4("openpty(%p, %p, %p, NULL, NULL): %s",
		   &ptyfd, &ttyfd, ptyname, strerror(errno));
	    return -1;
	 }
      }
#endif /* HAVE_OPENPTY */
      free(*copts);
      if ((*copts = moveopts(popts, GROUP_TERMIOS|GROUP_FORK|GROUP_EXEC|GROUP_PROCESS)) == NULL) {
	 return STAT_RETRYLATER;
      }
      applyopts_cloexec(ptyfd, popts);/*!*/
      if (fd->howtoshut == XIOSHUT_UNSPEC) {
	 fd->howtoshut = XIOSHUTRD_SIGTERM|XIOSHUTWR_SIGHUP;
      }
      if (fd->howtoclose == XIOCLOSE_UNSPEC) {
	 fd->howtoclose = XIOCLOSE_CLOSE_SIGTERM;
      }

      /* this for parent, was after fork */
      applyopts(ptyfd, popts, PH_FD);
      applyopts(ptyfd, popts, PH_LATE);
      if (applyopts_single(fd, popts, PH_LATE) < 0)  return -1;

      fd->fd1 = ptyfd;
      fd->fdtype = FDTYPE_SINGLE;

      /* this for child, was after fork */
      applyopts(ttyfd, *copts, PH_FD);
   } else
#endif /* HAVE_PTY */
   if (usepipes) {
      struct opt *popts2, *copts2;

      if (rw == XIO_RDWR) {
	 fd->dtype = XIODATA_2PIPE;
      }
      if (fd->howtoshut == XIOSHUT_UNSPEC) {
	 fd->howtoshut = XIOSHUT_CLOSE;
      }
      if (fd->howtoclose == XIOCLOSE_UNSPEC) {
	 fd->howtoclose = XIOCLOSE_CLOSE;
      }

      if (rw != XIO_WRONLY) {
	 if (Pipe(rdpip) < 0) {
	    Error2("pipe(%p): %s", rdpip, strerror(errno));
	    return STAT_RETRYLATER;
	 }
      } else {
	  rdpip[0] = rdpip[1] = -1;
      }
      /*0 Info2("pipe({%d,%d})", rdpip[0], rdpip[1]);*/
      /* rdpip[0]: read by socat; rdpip[1]: write by child */
      free(*copts);
      if ((*copts = moveopts(popts, GROUP_FORK|GROUP_EXEC|GROUP_PROCESS))
	  == NULL) {
	 return STAT_RETRYLATER;
      }

      popts2 = copyopts(popts, GROUP_ALL);
      copts2 = copyopts(*copts, GROUP_ALL);

      if (rw != XIO_WRONLY) {
	 applyopts_cloexec(rdpip[0], popts);
	 applyopts(rdpip[0], popts, PH_FD);
	 applyopts(rdpip[1], *copts, PH_FD);
      }

      if (rw != XIO_RDONLY) {
	 if (Pipe(wrpip) < 0) {
	    Error2("pipe(%p): %s", wrpip, strerror(errno));
	    return STAT_RETRYLATER;
	 }
      } else {
	  wrpip[0] = wrpip[1] = -1;
      }
      /*0 Info2("pipe({%d,%d})", wrpip[0], wrpip[1]);*/

      /* wrpip[1]: write by socat; wrpip[0]: read by child */
      if (rw != XIO_RDONLY) {
	 applyopts_cloexec(wrpip[1], popts2);
	 applyopts(wrpip[1], popts2, PH_FD);
	 applyopts(wrpip[0], copts2, PH_FD);
      }

      /* this for parent, was after fork */
      switch (rw) {
      case XIO_RDONLY:
	 fd->fd1 = rdpip[0];
	 fd->fdtype = FDTYPE_SINGLE;
	 break;
      case XIO_WRONLY:
	 fd->fd1 = wrpip[1];
	 fd->fdtype = FDTYPE_SINGLE;
	 break;
      case XIO_RDWR:
	 fd->fd1 = rdpip[0];
	 fd->fd2 = wrpip[1];
	 fd->fdtype = FDTYPE_DOUBLE;
	 break;
      }
      applyopts(fd->fd1, popts, PH_FD);
      applyopts(fd->fd1, popts, PH_LATE);
      if (applyopts_single(fd, popts, PH_LATE) < 0)  return -1;
   } else {
      int socktype = SOCK_STREAM;
      int protocol = 0;
      d = AF_UNIX;  
      retropt_int(popts, OPT_SO_TYPE, &socktype);
      result = Socketpair(d, socktype, protocol, sv);
      if (result < 0) {
	 Error5("socketpair(%d, %d, %d, %p): %s",
		d, socktype, protocol, sv, strerror(errno));
	 return STAT_RETRYLATER;
      }
      /*0 Info5("socketpair(%d, %d, %d, {%d,%d})",
	d, type, protocol, sv[0], sv[1]);*/
      free(*copts);
      if ((*copts = moveopts(popts, GROUP_FORK|GROUP_EXEC|GROUP_PROCESS)) == NULL) {
	 return STAT_RETRYLATER;
      }
      applyopts(sv[0], *copts, PH_PASTSOCKET);
      applyopts(sv[1], popts, PH_PASTSOCKET);

      applyopts_cloexec(sv[0], *copts);
      applyopts(sv[0], *copts, PH_FD);
      applyopts(sv[1], popts, PH_FD);

      applyopts(sv[0], *copts, PH_PREBIND);
      applyopts(sv[0], *copts, PH_BIND);
      applyopts(sv[0], *copts, PH_PASTBIND);
      applyopts(sv[1], popts, PH_PREBIND);
      applyopts(sv[1], popts, PH_BIND);
      applyopts(sv[1], popts, PH_PASTBIND);

      if (fd->howtoshut == XIOSHUT_UNSPEC) {
	 fd->howtoshut = XIOSHUT_DOWN;
      }
      if (fd->howtoclose == XIOCLOSE_UNSPEC) {
	 fd->howtoclose = XIOCLOSE_SIGTERM;
      }

      /* this for parent, was after fork */
      fd->fd1 = sv[0];
      fd->fdtype = FDTYPE_SINGLE;
      applyopts(fd->fd1, popts, PH_FD);
      applyopts(fd->fd1, popts, PH_LATE);
      if (applyopts_single(fd, popts, PH_LATE) < 0)  return -1;
   }
   /*0   if ((optpr = copyopts(*copts, GROUP_PROCESS)) == NULL)
     return STAT_RETRYLATER;*/
   retropt_bool(*copts, OPT_STDERR, &withstderr);
#if 0
   if (Signal(SIGCHLD, childdied) == SIG_ERR) {
      Warn2("signal(SIGCHLD, %p): %s", childdied, strerror(errno));
   }
#endif

   if (withfork) {
      const char *forkwaitstring;
      int forkwaitsecs = 0;
      sigset_t set, oldset;

      sigemptyset(&set);
      sigaddset(&set, SIGCHLD);

      Sigprocmask(SIG_BLOCK, &set, &oldset);	/* disable SIGCHLD */

      pid = Fork();
      if (pid < 0) {
	 Sigprocmask(SIG_SETMASK, &oldset, NULL);
	 Error1("fork(): %s", strerror(errno));
	 return STAT_RETRYLATER;
      }
      /* gdb recommends to have env controlled sleep after fork */
      if (forkwaitstring = getenv("SOCAT_FORK_WAIT")) {
         forkwaitsecs = atoi(forkwaitstring);
         Sleep(forkwaitsecs);
      }

      if (pid > 0) {
	 /* for parent (this is our socat process) */
	 xiosigchld_register(pid, xiosigaction_child, fd);
	 Sigprocmask(SIG_SETMASK, &oldset, NULL);	/* disable SIGCHLD */
      }

      if (pid == 0) {	/* child */
	 /* drop parents locks, reset FIPS... */
	 if (xio_forked_inchild() != 0) {
	    Exit(1);
	 }
	 Sigprocmask(SIG_SETMASK, &oldset, NULL);	/* disable SIGCHLD */
      }
   }
   if (!withfork || pid == 0) {	/* child */
      uid_t user;
      gid_t group;

      if (withfork) {
	 if (Signal(SIGCHLD, SIG_IGN) == SIG_ERR) {
	    Warn1("signal(SIGCHLD, SIG_IGN): %s", strerror(errno));
	 }

#if HAVE_PTY
	 if (usepty) {
	    if (rw != XIO_RDONLY && fdi != ttyfd) {
	       if (Dup2(ttyfd, fdi) < 0) {
		  Error3("dup2(%d, %d): %s", ttyfd, fdi, strerror(errno));
		  return STAT_RETRYLATER; }
	       /*0 Info2("dup2(%d, %d)", ttyfd, fdi);*/
	    }
	    if (rw != XIO_WRONLY && fdo != ttyfd) {
	       if (Dup2(ttyfd, fdo) < 0) {
		  Error3("dup2(%d, %d): %s", ttyfd, fdo, strerror(errno));
		  return STAT_RETRYLATER; }
	       /*0 Info2("dup2(%d, %d)", ttyfd, fdo);*/
	    }
	    if ((rw == XIO_RDONLY || fdi != ttyfd) &&
		(rw == XIO_WRONLY || fdo != ttyfd)) {
	       applyopts_cloexec(ttyfd, *copts);
	    }

	    applyopts(ttyfd, *copts, PH_LATE);

	    applyopts(ttyfd, *copts, PH_LATE2);
	 } else
#endif /* HAVE_PTY */
	    if (usepipes) {
	       /* we might have a temporary conflict between what FDs are
		  currently allocated, and which are to be used. We try to find
		  a graceful solution via temporary descriptors */
	       int tmpi, tmpo;

	       if (fdi == rdpip[1]) {	/* a conflict here */
		  if ((tmpi = Dup(wrpip[0])) < 0) {
		     Error2("dup(%d): %s", wrpip[0], strerror(errno));
		     return STAT_RETRYLATER;
		  }
		  /*0 Info2("dup(%d) -> %d", wrpip[0], tmpi);*/
		  rdpip[1] = tmpi;
	       }
	       if (fdo == wrpip[0]) {	/* a conflict here */
		  if ((tmpo = Dup(rdpip[1])) < 0) {
		     Error2("dup(%d): %s", rdpip[1], strerror(errno));
		     return STAT_RETRYLATER;
		  }
		  /*0 Info2("dup(%d) -> %d", rdpip[1], tmpo);*/
		  wrpip[0] = tmpo;
	       }
	       
	       if (rw != XIO_WRONLY && rdpip[1] != fdo) {
		  if (Dup2(rdpip[1], fdo) < 0) {
		     Error3("dup2(%d, %d): %s", rdpip[1], fdo, strerror(errno));
		     return STAT_RETRYLATER;
		  }
		  Close(rdpip[1]);
		  /*0 Info2("dup2(%d, %d)", rdpip[1], fdo);*/
		  /*0 applyopts_cloexec(fdo, *copts);*/
	       }
	       if (rw != XIO_RDONLY && wrpip[0] != fdi) {
		  if (Dup2(wrpip[0], fdi) < 0) {
		     Error3("dup2(%d, %d): %s", wrpip[0], fdi, strerror(errno));
		     return STAT_RETRYLATER;
		  }
		  Close(wrpip[0]);
		  /*0 Info2("dup2(%d, %d)", wrpip[0], fdi);*/
		  /*0 applyopts_cloexec(wrpip[0], *copts);*/	/* option is already consumed! */
		  /* applyopts_cloexec(fdi, *copts);*/	/* option is already consumed! */
	       }

	       applyopts(fdi, *copts, PH_LATE);
	       applyopts(fdo, *copts, PH_LATE);
	       applyopts(fdi, *copts, PH_LATE2);
	       applyopts(fdo, *copts, PH_LATE2);

	    } else {	/* socketpair */
	       if (rw != XIO_RDONLY && fdi != sv[1]) {
		  if (Dup2(sv[1], fdi) < 0) {
		     Error3("dup2(%d, %d): %s", sv[1], fdi, strerror(errno));
		     return STAT_RETRYLATER; }
		  /*0 Info2("dup2(%d, %d)", sv[1], fdi);*/
	       }
	       if (rw != XIO_WRONLY && fdo != sv[1]) {
		  if (Dup2(sv[1], fdo) < 0) {
		     Error3("dup2(%d, %d): %s", sv[1], fdo, strerror(errno));
		     return STAT_RETRYLATER; }
		  /*0 Info2("dup2(%d, %d)", sv[1], fdo);*/
	       }
	       if (fdi != sv[1] && fdo != sv[1]) {
		  applyopts_cloexec(sv[1], *copts);
	       }

	       applyopts(fdi, *copts, PH_LATE);
	       applyopts(fdi, *copts, PH_LATE2);
	    }
      } /* withfork */
      else {
	 applyopts(-1, *copts, PH_LATE);
	 applyopts(-1, *copts, PH_LATE2);
      }

      /* what to do with stderr? */
      if (withstderr) {
	 /* handle it just like ordinary process output, i.e. copy output fd */
	 if (!withfork) {
	    if (Dup2(fdo, 2) < 0) {
	       Error2("dup2(%d, 2): %s", fdo, strerror(errno));
	    }
	    /*0 Info1("dup2(%d, 2)", fdo);*/
	 } else
#if HAVE_PTY
	 if (usepty) {
	    if (Dup2(ttyfd, 2) < 0) {
	       Error2("dup2(%d, 2): %s", ttyfd, strerror(errno));
	    }
	    /*0 Info1("dup2(%d, 2)", ttyfd);*/
	 } else
#endif /* HAVE_PTY */
	 if (usepipes) {
	    if (Dup2(/*rdpip[1]*/ fdo, 2) < 0) {
	       Error2("dup2(%d, 2): %s", /*rdpip[1]*/ fdo, strerror(errno));
	    }
	    /*0 Info1("dup2(%d, 2)", rdpip[1]);*/
	 } else {
	    if (Dup2(sv[1], 2) < 0) {
	       Error2("dup2(%d, 2): %s", sv[1], strerror(errno));
	    }
	    /*0 Info1("dup2(%d, 2)", sv[1]);*/
	 }
      }
      _xioopen_setdelayeduser();
      /* set group before user - maybe you are not permitted afterwards */
      if (retropt_gidt(*copts, OPT_SETGID, &group) >= 0) {
	 Setgid(group);
      }
      if (retropt_uidt(*copts, OPT_SETUID, &user) >= 0) {
	 Setuid(user);
      }
      return 0;	/* indicate child process */
   }

   /* for parent (this is our socat process) */
   Notice1("forked off child process "F_pid, pid);

#if 0
   if ((popts = copyopts(*copts,
			 GROUP_FD|GROUP_TERMIOS|GROUP_FORK|GROUP_SOCKET|GROUP_SOCK_UNIX|GROUP_FIFO)) == NULL)
      return STAT_RETRYLATER;
#endif

   if (0) {
      ;	/* for canonical reasons */
#if HAVE_PTY
   } else if (usepty) {
      if (Close(ttyfd) < 0) {
	 Info2("close(%d): %s", ttyfd, strerror(errno));
      }
#endif /* HAVE_PTY */
#if 1
   } else if (usepipes) {
      if (wrpip[0] >= 0)  Close(wrpip[0]);
      if (rdpip[1] >= 0)  Close(rdpip[1]);
   } else { /* socketpair() */
      Close(sv[1]);
   }
#endif
   fd->child.pid = pid;

   if (applyopts_single(fd, popts, PH_LATE) < 0)  return -1;
   applyopts_signal(fd, popts);
   if ((numleft = leftopts(popts)) > 0) {
      Error1("%d option(s) could not be used", numleft);
      showleft(popts);
      return STAT_NORETRY;
   }

   return pid;	/* indicate parent (main) process */
}

#endif /* 0 */


/* fork for exec/system, but return before exec'ing.
   return=0: is child process
   return>0: is parent process
   return<0: error occurred, assume parent process and no child exists !!!
 */
int _xioopen_foxec_end(int xioflags,	/* XIO_RDONLY etc. */
		struct single *fd,
		unsigned groups,
		       struct opt **copts, /* in: opts; out: opts for child */
		       int *duptostderr
		) {
   struct opt *popts;	/* parent process options */
   int numleft;
   int sv[2], rdpip[2], wrpip[2];
   int rw = (xioflags & XIO_ACCMODE);
   bool usepipes = false;
#if HAVE_PTY
   int ptyfd = -1, ttyfd = -1;
   bool usebestpty = false;	/* use the best available way to open pty */
#if defined(HAVE_DEV_PTMX) || defined(HAVE_DEV_PTC)
   bool useptmx = false;	/* use /dev/ptmx or equivalent */
#endif
#if HAVE_OPENPTY
   bool useopenpty = false;	/* try only openpty */
#endif	/* HAVE_OPENPTY */
   bool usepty = false;		/* any of the pty options is selected */
   char ptyname[MAXPTYNAMELEN];
#endif /* HAVE_PTY */
   pid_t pid = 0;	/* mostly int */
   short fdi = 0, fdo = 1;
   short result;
   bool withstderr = false;
   bool nofork = false;
   bool withfork;

   popts = moveopts(*copts, GROUP_ALL);
   if (applyopts_single(fd, popts, PH_INIT) < 0)  return -1;
   applyopts2(-1, popts, PH_INIT, PH_EARLY);

   retropt_bool(popts, OPT_NOFORK, &nofork);
   withfork = !nofork;

   retropt_bool(popts, OPT_PIPES, &usepipes);
#if HAVE_PTY
   retropt_bool(popts, OPT_PTY, &usebestpty);
#if HAVE_OPENPTY
   retropt_bool(popts, OPT_OPENPTY, &useopenpty);
#endif
#if defined(HAVE_DEV_PTMX) || defined(HAVE_DEV_PTC)
   retropt_bool(popts, OPT_PTMX, &useptmx);
#endif
   usepty = (usebestpty
#if HAVE_OPENPTY
	     || useopenpty
#endif
#if defined(HAVE_DEV_PTMX) || defined(HAVE_DEV_PTC)
	     || useptmx
#endif
	     );
   if (usepipes && usepty) {
      Warn("_xioopen_foxec(): options \"pipes\" and \"pty\" must not be specified together; ignoring \"pipes\"");
      usepipes = false;
   }
#endif /* HAVE_PTY */
   retropt_ushort(popts, OPT_FDIN,  (unsigned short *)&fdi);
   retropt_ushort(popts, OPT_FDOUT, (unsigned short *)&fdo);

   if (rw == XIO_WRONLY) {
      if (fd->howtoclose == XIOCLOSE_UNSPEC) {
	 fd->howtoclose = XIOCLOSE_SLEEP_SIGTERM;
      }
   }
   if (withfork) {
      if (!(xioflags&XIO_MAYCHILD)) {
	 Error("cannot fork off child process here");
	 /*!! free something */
	 return -1;
      }
      fd->flags |= XIO_DOESCHILD;

#if HAVE_PTY
      Notice2("forking off child, using %s for %s",
	    &("socket\0\0pipes\0\0\0pty\0\0\0\0\0"[(usepipes<<3)|(usepty<<4)]),
	      ddirection[rw]);
#else
      Notice2("forking off child, using %s for %s",
	      &("socket\0\0pipes\0\0\0"[(usepipes<<3)]),
	      ddirection[rw]);
#endif /* HAVE_PTY */
   }
   applyopts(-1, popts, PH_PREBIGEN);

   if (!withfork) {
      /*0 struct single *stream1, *stream2;*/

      free(*copts);
      *copts = moveopts(popts, GROUP_ALL);
      /* what if WE are sock1 ? */
#if 1
      if (!(xioflags & XIO_MAYEXEC /* means exec+nofork */)) {
	 Error("nofork option is not allowed here");
	 /*!! free something */
	 return -1;
      }
      fd->flags |= XIO_DOESEXEC;
#else      /*!! */
      if (sock1 == NULL) {
	 Fatal("nofork option must no be applied to first socat address");
      }
#endif
      if (fd->howtoclose == XIOCLOSE_UNSPEC) {
	 fd->howtoclose = XIOCLOSE_CLOSE;
      }

#if 0 /*!! */
      if (sock1->tag == XIO_TAG_DUAL) {
	 stream1 = &sock1->dual.stream[0]->stream;
	 stream2 = &sock1->dual.stream[1]->stream;
      } else {
	 stream1 = &sock1->stream;
	 stream2 = &sock1->stream;
      }
      if (stream1->dtype == DATA_READLINE || stream2->dtype == DATA_READLINE ||
	  stream1->dtype == DATA_OPENSSL  || stream2->dtype == DATA_OPENSSL
	  ) {
	 Error("with option nofork, openssl and readline in address1 do not work");
      }
      if (stream1->lineterm != LINETERM_RAW ||
	  stream2->lineterm != LINETERM_RAW ||
	  stream1->ignoreeof || stream2->ignoreeof) {
	 Warn("due to option nofork, address1 options for lineterm and igoreeof do not apply");
      }
#endif

      /*! problem: when fdi==WRFD(sock[0]) or fdo==RDFD(sock[0]) */
      if (rw != XIO_WRONLY) {
	 if (XIO_GETRDFD(sock[0]/*!!*/) == fdi) {
	    if (Fcntl_l(fdi, F_SETFD, 0) < 0) {
	       Warn2("fcntl(%d, F_SETFD, 0): %s", fdi, strerror(errno));
	    }
	    if (Dup2(XIO_GETRDFD(sock[0]), fdi) < 0) {
	       Error3("dup2(%d, %d): %s",
		      XIO_GETRDFD(sock[0]), fdi, strerror(errno));
	    }
	    /*0 Info2("dup2(%d, %d)", XIO_GETRDFD(sock[0]), fdi);*/
	 } else {
	    if (Dup2(XIO_GETRDFD(sock[0]), fdi) < 0) {
	       Error3("dup2(%d, %d): %s",
		      XIO_GETRDFD(sock[0]), fdi, strerror(errno));
	    }
	    /*0 Info2("dup2(%d, %d)", XIO_GETRDFD(sock[0]), fdi);*/
	 }
      }
      if (rw != XIO_RDONLY) {
	 if (XIO_GETWRFD(sock[0]) == fdo) {
	    if (Fcntl_l(fdo, F_SETFD, 0) < 0) {
	       Warn2("fcntl(%d, F_SETFD, 0): %s", fdo, strerror(errno));
	    }
	    if (Dup2(XIO_GETWRFD(sock[0]), fdo) < 0) {
	       Error3("dup2(%d, %d): %s)",
		      XIO_GETWRFD(sock[0]), fdo, strerror(errno));
	    }
	    /*0 Info2("dup2(%d, %d)", XIO_GETWRFD(sock[0]), fdo);*/
	 } else {
	    if (Dup2(XIO_GETWRFD(sock[0]), fdo) < 0) {
	       Error3("dup2(%d, %d): %s)",
		      XIO_GETWRFD(sock[0]), fdo, strerror(errno));
	    }
	    /*0 Info2("dup2(%d, %d)", XIO_GETWRFD(sock[0]), fdo);*/
	 }
      }
   } else
#if HAVE_PTY
   if (usepty) {

#if defined(HAVE_DEV_PTMX)
#  define PTMX "/dev/ptmx"	/* Linux */
#elif HAVE_DEV_PTC
#  define PTMX "/dev/ptc"	/* AIX 4.3.3 */
#endif
      fd->dtype = XIODATA_PTY;
      if (fd->howtoshut == XIOSHUT_UNSPEC) {
	 fd->howtoshut = XIOSHUTRD_SIGTERM|XIOSHUTWR_SIGHUP;
      }
      if (fd->howtoclose == XIOCLOSE_UNSPEC) {
	 fd->howtoclose = XIOCLOSE_CLOSE_SIGTERM;
      }

#if HAVE_DEV_PTMX || HAVE_DEV_PTC
      if (usebestpty || useptmx) {
	 if ((ptyfd = Open(PTMX, O_RDWR|O_NOCTTY, 0620)) < 0) {
	    Warn1("open(\""PTMX"\", O_RDWR|O_NOCTTY, 0620): %s",
		  strerror(errno));
	    /*!*/
	 } else {
	    /*0 Info2("open(\"%s\", O_RDWR|O_NOCTTY, 0620) -> %d", PTMX, ptyfd);*/
	 }
	 if (ptyfd >= 0 && ttyfd < 0) {
	    char *tn = NULL;
	    /* we used PTMX before forking */
	    extern char *ptsname(int);
#if HAVE_GRANTPT	/* AIX, not Linux */
	    if (Grantpt(ptyfd)/*!*/ < 0) {
	       Warn2("grantpt(%d): %s", ptyfd, strerror(errno));
	    }
#endif /* HAVE_GRANTPT */
#if HAVE_UNLOCKPT
	    if (Unlockpt(ptyfd)/*!*/ < 0) {
	       Warn2("unlockpt(%d): %s", ptyfd, strerror(errno));
	    }
#endif /* HAVE_UNLOCKPT */
#if HAVE_PTSNAME	/* AIX, not Linux */
	    if ((tn = Ptsname(ptyfd)) == NULL) {
	       Warn2("ptsname(%d): %s", ptyfd, strerror(errno));
	    }
#endif /* HAVE_PTSNAME */
	    if (tn == NULL) {
	       if ((tn = Ttyname(ptyfd)) == NULL) {
		  Warn2("ttyname(%d): %s", ptyfd, strerror(errno));
	       }
	    }
	    strncpy(ptyname, tn, MAXPTYNAMELEN);	/*! ttyname_r() */
	    if ((ttyfd = Open(tn, O_RDWR|O_NOCTTY, 0620)) < 0) {
	       Warn2("open(\"%s\", O_RDWR|O_NOCTTY, 0620): %s", tn, strerror(errno));
	    } else {
	       /*0 Info2("open(\"%s\", O_RDWR|O_NOCTTY, 0620) -> %d", tn, ttyfd);*/
	    }

#ifdef I_PUSH
	    /* Linux: I_PUSH def'd; pty: ioctl(, I_FIND, ...) -> -1 EINVAL */
	    /* AIX:   I_PUSH def'd; pty: ioctl(, I_FIND, ...) -> 1 */
	    /* SunOS: I_PUSH def'd; pty: ioctl(, I_FIND, ...) -> 0 */
	    /* HP-UX: I_PUSH def'd; pty: ioctl(, I_FIND, ...) -> 0 */
	    if (Ioctl(ttyfd, I_FIND, "ldterm") == 0) {
	       Ioctl(ttyfd, I_PUSH, "ptem");		/* 0 */
	       Ioctl(ttyfd, I_PUSH, "ldterm");		/* 0 */
	       Ioctl(ttyfd, I_PUSH, "ttcompat");	/* HP-UX: -1 */
	    }
#endif

#if 0	    /* the following block need not work */

	    if (ttyfd >= 0 && ((tn = Ttyname(ttyfd)) == NULL)) {
	       Warn2("ttyname(%d): %s", ttyfd, strerror(errno));
	    }
	    if (tn == NULL) {
	       Error("could not open pty");
	       return -1;
	    }
#endif
	    Info1("opened pseudo terminal %s", tn);
	 }
      }
#endif /* HAVE_DEV_PTMX || HAVE_DEV_PTC */
#if HAVE_OPENPTY
      if (ptyfd < 0) {
	 int result;
	 if ((result = Openpty(&ptyfd, &ttyfd, ptyname, NULL, NULL)) < 0) {
	    Error4("openpty(%p, %p, %p, NULL, NULL): %s",
		   &ptyfd, &ttyfd, ptyname, strerror(errno));
	    return -1;
	 }
      }
#endif /* HAVE_OPENPTY */
      free(*copts);
      if ((*copts = moveopts(popts, GROUP_TERMIOS|GROUP_FORK|GROUP_EXEC|GROUP_PROCESS)) == NULL) {
	 return -1;
      }
      applyopts_cloexec(ptyfd, popts);/*!*/

      /* exec:...,pty did not kill child process under some circumstances */
      if (fd->howtoshut == XIOSHUT_UNSPEC) {
	 fd->howtoshut = XIOSHUTRD_SIGTERM|XIOSHUTWR_SIGHUP;
      }
      if (fd->howtoclose == XIOCLOSE_UNSPEC) {
	 fd->howtoclose = XIOCLOSE_CLOSE_SIGTERM;
      }

      /* this for parent, was after fork */
      applyopts(ptyfd, popts, PH_FD);
      applyopts(ptyfd, popts, PH_LATE);
      if (applyopts_single(fd, popts, PH_LATE) < 0)  return -1;

      fd->fd1 = ptyfd;
      fd->fdtype = FDTYPE_SINGLE;

      /* this for child, was after fork */
      applyopts(ttyfd, *copts, PH_FD);
   } else
#endif /* HAVE_PTY */
   if (usepipes) {
      struct opt *popts2, *copts2;

      if (rw == XIO_RDWR) {
	 fd->dtype = XIODATA_2PIPE;
      }
      if (fd->howtoshut == XIOSHUT_UNSPEC) {
	 fd->howtoshut = XIOSHUT_CLOSE;
      }
      if (fd->howtoclose == XIOCLOSE_UNSPEC) {
	 fd->howtoclose = XIOCLOSE_CLOSE;
      }

      if (rw != XIO_WRONLY) {
	 if (Pipe(rdpip) < 0) {
	    Error2("pipe(%p): %s", rdpip, strerror(errno));
	    return -1;
	 }
      }
      /*0 Info2("pipe({%d,%d})", rdpip[0], rdpip[1]);*/
      /* rdpip[0]: read by socat; rdpip[1]: write by child */
      free(*copts);
      if ((*copts = moveopts(popts, GROUP_FORK|GROUP_EXEC|GROUP_PROCESS))
	  == NULL) {
	 return -1;
      }

      popts2 = copyopts(popts, GROUP_ALL);
      copts2 = copyopts(*copts, GROUP_ALL);

      if (rw != XIO_WRONLY) {
	 applyopts_cloexec(rdpip[0], popts);
	 applyopts(rdpip[0], popts, PH_FD);
	 applyopts(rdpip[1], *copts, PH_FD);
      }

      if (rw != XIO_RDONLY) {
	 if (Pipe(wrpip) < 0) {
	    Error2("pipe(%p): %s", wrpip, strerror(errno));
	    return -1;
	 }
      }
      /*0 Info2("pipe({%d,%d})", wrpip[0], wrpip[1]);*/

      /* wrpip[1]: write by socat; wrpip[0]: read by child */
      if (rw != XIO_RDONLY) {
	 applyopts_cloexec(wrpip[1], popts2);
	 applyopts(wrpip[1], popts2, PH_FD);
	 applyopts(wrpip[0], copts2, PH_FD);
      }

      /* this for parent, was after fork */
      switch (rw) {
      case XIO_RDONLY:
	 fd->fd1 = rdpip[0];
	 fd->fdtype = FDTYPE_SINGLE;
	 break;
      case XIO_WRONLY:
	 fd->fd1 = wrpip[1];
	 fd->fdtype = FDTYPE_SINGLE;
	 break;
      case XIO_RDWR:
	 fd->fd1 = rdpip[0];
	 fd->fd2 = wrpip[1];
	 fd->fdtype = FDTYPE_DOUBLE;
	 break;
      }
      applyopts(fd->fd1, popts, PH_FD);
      applyopts(fd->fd1, popts, PH_LATE);
      if (applyopts_single(fd, popts, PH_LATE) < 0)  return -1;
   } else {
      int pf = AF_UNIX;
      retropt_int(popts, OPT_PROTOCOL_FAMILY, &pf);
      result = xiosocketpair(popts, pf, SOCK_STREAM, 0, sv);
      if (result < 0) {
	 return -1;
      }
      /*0 Info5("socketpair(%d, %d, %d, {%d,%d})",
	d, type, protocol, sv[0], sv[1]);*/
      free(*copts);
      if ((*copts = moveopts(popts, GROUP_FORK|GROUP_EXEC|GROUP_PROCESS)) == NULL) {
	 return -1;
      }
      applyopts(sv[0], *copts, PH_PASTSOCKET);
      applyopts(sv[1], popts, PH_PASTSOCKET);

      applyopts_cloexec(sv[0], *copts);
      applyopts(sv[0], *copts, PH_FD);
      applyopts(sv[1], popts, PH_FD);

      applyopts(sv[0], *copts, PH_PREBIND);
      applyopts(sv[0], *copts, PH_BIND);
      applyopts(sv[0], *copts, PH_PASTBIND);
      applyopts(sv[1], popts, PH_PREBIND);
      applyopts(sv[1], popts, PH_BIND);
      applyopts(sv[1], popts, PH_PASTBIND);

      if (fd->howtoshut == XIOSHUT_UNSPEC) {
	 fd->howtoshut = XIOSHUT_DOWN;
      }
      if (fd->howtoclose == XIOCLOSE_UNSPEC) {
	 fd->howtoclose = XIOCLOSE_SIGTERM;
      }

      /* this for parent, was after fork */
      fd->fd1 = sv[0];
      fd->fdtype = FDTYPE_SINGLE;
      applyopts(fd->fd1, popts, PH_FD);
      applyopts(fd->fd1, popts, PH_LATE);
      if (applyopts_single(fd, popts, PH_LATE) < 0)  return -1;
   }
   /*0   if ((optpr = copyopts(*copts, GROUP_PROCESS)) == NULL)
     return -1;*/
   retropt_bool(*copts, OPT_STDERR, &withstderr);

   xiosetchilddied();	/* set SIGCHLD handler */

   xiosetchilddied();	/* set SIGCHLD handler */

   if (withfork) {
      sigset_t set, oldset;

      sigemptyset(&set);
      sigaddset(&set, SIGCHLD);
      Sigprocmask(SIG_BLOCK, &set, &oldset);	/* disable SIGCHLD */
      pid = xio_fork(true, E_ERROR);
      if (pid < 0) {
	 Sigprocmask(SIG_SETMASK, &oldset, NULL);
	 Error1("fork(): %s", strerror(errno));
	 return -1;
      }

      if (pid > 0) {
	 /* for parent (this is our socat process) */
	 xiosigchld_register(pid, xiosigaction_child, fd);
	 Sigprocmask(SIG_SETMASK, &oldset, NULL);	/* enable SIGCHLD */
      }

      if (pid == 0) {	/* child */
	 /* drop parents locks, reset FIPS... */
	 if (xio_forked_inchild() != 0) {
	    Exit(1);
	 }
	 Sigprocmask(SIG_SETMASK, &oldset, NULL);	/* enable SIGCHLD */
      }
   }
   if (!withfork || pid == 0) {	/* child */
      uid_t user;
      gid_t group;

      if (withfork) {
	 if (Signal(SIGCHLD, SIG_IGN) == SIG_ERR) {
	    Warn1("signal(SIGCHLD, SIG_IGN): %s", strerror(errno));
	 }

#if HAVE_PTY
	 if (usepty) {
	    if (rw != XIO_RDONLY && fdi != ttyfd) {
	       if (Dup2(ttyfd, fdi) < 0) {
		  Error3("dup2(%d, %d): %s", ttyfd, fdi, strerror(errno));
		  return -1; }
	       /*0 Info2("dup2(%d, %d)", ttyfd, fdi);*/
	    }
	    if (rw != XIO_WRONLY && fdo != ttyfd) {
	       if (Dup2(ttyfd, fdo) < 0) {
		  Error3("dup2(%d, %d): %s", ttyfd, fdo, strerror(errno));
		  return -1; }
	       /*0 Info2("dup2(%d, %d)", ttyfd, fdo);*/
	    }
	    if ((rw == XIO_RDONLY || fdi != ttyfd) &&
		(rw == XIO_WRONLY || fdo != ttyfd)) {
	       applyopts_cloexec(ttyfd, *copts);
	    }

	    applyopts(ttyfd, *copts, PH_LATE);

	    applyopts(ttyfd, *copts, PH_LATE2);
	 } else
#endif /* HAVE_PTY */
	    if (usepipes) {
	       /* we might have a temporary conflict between what FDs are
		  currently allocated, and which are to be used. We try to find
		  a graceful solution via temporary descriptors */
	       int tmpi, tmpo;

	       Close(rdpip[0]);
	       Close(wrpip[1]);

	       if (fdi == rdpip[1]) {	/* a conflict here */
		  if ((tmpi = Dup(wrpip[0])) < 0) {
		     Error2("dup(%d): %s", wrpip[0], strerror(errno));
		     return -1;
		  }
		  /*0 Info2("dup(%d) -> %d", wrpip[0], tmpi);*/
		  rdpip[1] = tmpi;
	       }
	       if (fdo == wrpip[0]) {	/* a conflict here */
		  if ((tmpo = Dup(rdpip[1])) < 0) {
		     Error2("dup(%d): %s", rdpip[1], strerror(errno));
		     return -1;
		  }
		  /*0 Info2("dup(%d) -> %d", rdpip[1], tmpo);*/
		  wrpip[0] = tmpo;
	       }
	       
	       if (rw != XIO_WRONLY && rdpip[1] != fdo) {
		  if (Dup2(rdpip[1], fdo) < 0) {
		     Error3("dup2(%d, %d): %s", rdpip[1], fdo, strerror(errno));
		     return -1;
		  }
		  Close(rdpip[1]);
		  /*0 Info2("dup2(%d, %d)", rdpip[1], fdo);*/
		  /*0 applyopts_cloexec(fdo, *copts);*/
	       }
	       if (rw != XIO_RDONLY && wrpip[0] != fdi) {
		  if (Dup2(wrpip[0], fdi) < 0) {
		     Error3("dup2(%d, %d): %s", wrpip[0], fdi, strerror(errno));
		     return -1;
		  }
		  Close(wrpip[0]);
		  /*0 Info2("dup2(%d, %d)", wrpip[0], fdi);*/
		  /*0 applyopts_cloexec(wrpip[0], *copts);*/	/* option is already consumed! */
		  /* applyopts_cloexec(fdi, *copts);*/	/* option is already consumed! */
	       }

	       applyopts(fdi, *copts, PH_LATE);
	       applyopts(fdo, *copts, PH_LATE);
	       applyopts(fdi, *copts, PH_LATE2);
	       applyopts(fdo, *copts, PH_LATE2);

	    } else {	/* socketpair */
	       if (rw != XIO_RDONLY && fdi != sv[1]) {
		  if (Dup2(sv[1], fdi) < 0) {
		     Error3("dup2(%d, %d): %s", sv[1], fdi, strerror(errno));
		     return -1; }
		  /*0 Info2("dup2(%d, %d)", sv[1], fdi);*/
	       }
	       if (rw != XIO_WRONLY && fdo != sv[1]) {
		  if (Dup2(sv[1], fdo) < 0) {
		     Error3("dup2(%d, %d): %s", sv[1], fdo, strerror(errno));
		     return -1; }
		  /*0 Info2("dup2(%d, %d)", sv[1], fdo);*/
	       }
	       if (fdi != sv[1] && fdo != sv[1]) {
		  applyopts_cloexec(sv[1], *copts);
	       }

	       applyopts(fdi, *copts, PH_LATE);
	       applyopts(fdi, *copts, PH_LATE2);
	    }
      } /* withfork */
      else {
	 applyopts(-1, *copts, PH_LATE);
	 applyopts(-1, *copts, PH_LATE2);
      }
      _xioopen_setdelayeduser();
      /* set group before user - maybe you are not permitted afterwards */
      if (retropt_gidt(*copts, OPT_SETGID, &group) >= 0) {
	 Setgid(group);
      }
      if (retropt_uidt(*copts, OPT_SETUID, &user) >= 0) {
	 Setuid(user);
      }
      if (withstderr) {
	 *duptostderr = fdo;
      } else {
	 *duptostderr = -1;
      }

      return 0;	/* indicate child process */
   }

   /* for parent (this is our socat process) */
   Notice1("forked off child process "F_pid, pid);

#if 0
   if ((popts = copyopts(*copts,
			 GROUP_FD|GROUP_TERMIOS|GROUP_FORK|GROUP_SOCKET|GROUP_SOCK_UNIX|GROUP_FIFO)) == NULL)
      return STAT_RETRYLATER;
#endif

   if (0) {
      ;	/* for canonical reasons */
#if HAVE_PTY
   } else if (usepty) {
      if (Close(ttyfd) < 0) {
	 Info2("close(%d): %s", ttyfd, strerror(errno));
      }
#endif /* HAVE_PTY */
#if 1
   } else if (usepipes) {
      Close(wrpip[0]);
      Close(rdpip[1]);
   } else { /* socketpair() */
      Close(sv[1]);
   }
#endif
   fd->child.pid = pid;

   if (applyopts_single(fd, popts, PH_LATE) < 0)  return -1;
   applyopts_signal(fd, popts);
   if ((numleft = leftopts(popts)) > 0) {
      Error1("%d option(s) could not be used", numleft);
      showleft(popts);
      return STAT_NORETRY;
   }

   return pid;	/* indicate parent (main) process */
}

#endif /* WITH_EXEC || WITH_SYSTEM */


int setopt_path(struct opt *opts, char **path) {
   if (retropt_string(opts, OPT_PATH, path) >= 0) {
      if (setenv("PATH", *path, 1) < 0) {
	 Error1("setenv(\"PATH\", \"%s\", 1): insufficient space", *path);
	 return -1;
      }
   }
   return 0;
}