Archipelago » qemu

/*

 * Copyright (c) 1995 Danny Gasparovski.

 * 

 * Please read the file COPYRIGHT for the

 * terms and conditions of the copyright.

 */

#define WANT_SYS_IOCTL_H

#include <slirp.h>

u_int curtime, time_fasttimo, last_slowtimo, detach_time;

u_int detach_wait = 600000;        /* 10 minutes */

#if 0

int x_port = -1;

int x_display = 0;

int x_screen = 0;

int

show_x(buff, inso)

        char *buff;

        struct socket *inso;

{

        if (x_port < 0) {

                lprint("X Redir: X not being redirected.\r\n");

        } else {

                lprint("X Redir: In sh/bash/zsh/etc. type: DISPLAY=%s:%d.%d; export DISPLAY\r\n",

                      inet_ntoa(our_addr), x_port, x_screen);

                lprint("X Redir: In csh/tcsh/etc. type:    setenv DISPLAY %s:%d.%d\r\n",

                      inet_ntoa(our_addr), x_port, x_screen);

                if (x_display)

                   lprint("X Redir: Redirecting to display %d\r\n", x_display);

        }

        return CFG_OK;

}

/*

 * XXX Allow more than one X redirection?

 */

void

redir_x(inaddr, start_port, display, screen)

        u_int32_t inaddr;

        int start_port;

        int display;

        int screen;

{

        int i;

        if (x_port >= 0) {

                lprint("X Redir: X already being redirected.\r\n");

                show_x(0, 0);

        } else {

                for (i = 6001 + (start_port-1); i <= 6100; i++) {

                        if (solisten(htons(i), inaddr, htons(6000 + display), 0)) {

                                /* Success */

                                x_port = i - 6000;

                                x_display = display;

                                x_screen = screen;

                                show_x(0, 0);

                                return;

                        }

                }

                lprint("X Redir: Error: Couldn't redirect a port for X. Weird.\r\n");

        }

}

#endif

#ifndef HAVE_INET_ATON

int

inet_aton(cp, ia)

        const char *cp;

        struct in_addr *ia;

{

        u_int32_t addr = inet_addr(cp);

        if (addr == 0xffffffff)

                return 0;

        ia->s_addr = addr;

        return 1;

}

#endif

/*

 * Get our IP address and put it in our_addr

 */

void

getouraddr()

{

        char buff[256];

        struct hostent *he;

        if (gethostname(buff,256) < 0)

           return;

        if ((he = gethostbyname(buff)) == NULL)

           return;

        our_addr = *(struct in_addr *)he->h_addr;

}

#if SIZEOF_CHAR_P == 8

struct quehead_32 {

        u_int32_t qh_link;

        u_int32_t qh_rlink;

};

inline void

insque_32(a, b)

        void *a;

        void *b;

{

        register struct quehead_32 *element = (struct quehead_32 *) a;

        register struct quehead_32 *head = (struct quehead_32 *) b;

        element->qh_link = head->qh_link;

        head->qh_link = (u_int32_t)element;

        element->qh_rlink = (u_int32_t)head;

        ((struct quehead_32 *)(element->qh_link))->qh_rlink

        = (u_int32_t)element;

}

inline void

remque_32(a)

        void *a;

{

        register struct quehead_32 *element = (struct quehead_32 *) a;

        ((struct quehead_32 *)(element->qh_link))->qh_rlink = element->qh_rlink;

        ((struct quehead_32 *)(element->qh_rlink))->qh_link = element->qh_link;

        element->qh_rlink = 0;

}

#endif /* SIZEOF_CHAR_P == 8 */

struct quehead {

        struct quehead *qh_link;

        struct quehead *qh_rlink;

};

inline void

insque(a, b)

        void *a, *b;

{

        register struct quehead *element = (struct quehead *) a;

        register struct quehead *head = (struct quehead *) b;

        element->qh_link = head->qh_link;

        head->qh_link = (struct quehead *)element;

        element->qh_rlink = (struct quehead *)head;

        ((struct quehead *)(element->qh_link))->qh_rlink

        = (struct quehead *)element;

}

inline void

remque(a)

     void *a;

{

  register struct quehead *element = (struct quehead *) a;

  ((struct quehead *)(element->qh_link))->qh_rlink = element->qh_rlink;

  ((struct quehead *)(element->qh_rlink))->qh_link = element->qh_link;

  element->qh_rlink = NULL;

  /*  element->qh_link = NULL;  TCP FIN1 crashes if you do this.  Why ? */

}

/* #endif */

int

add_exec(ex_ptr, do_pty, exec, addr, port)

        struct ex_list **ex_ptr;

        int do_pty;

        char *exec;

        int addr;

        int port;

{

        struct ex_list *tmp_ptr;

        /* First, check if the port is "bound" */

        for (tmp_ptr = *ex_ptr; tmp_ptr; tmp_ptr = tmp_ptr->ex_next) {

                if (port == tmp_ptr->ex_fport && addr == tmp_ptr->ex_addr)

                   return -1;

        }

        tmp_ptr = *ex_ptr;

        *ex_ptr = (struct ex_list *)malloc(sizeof(struct ex_list));

        (*ex_ptr)->ex_fport = port;

        (*ex_ptr)->ex_addr = addr;

        (*ex_ptr)->ex_pty = do_pty;

        (*ex_ptr)->ex_exec = strdup(exec);

        (*ex_ptr)->ex_next = tmp_ptr;

        return 0;

}

#ifndef HAVE_STRERROR

/*

 * For systems with no strerror

 */

extern int sys_nerr;

extern char *sys_errlist[];

char *

strerror(error)

        int error;

{

        if (error < sys_nerr)

           return sys_errlist[error];

        else

           return "Unknown error.";

}

#endif

#ifdef _WIN32

int

fork_exec(so, ex, do_pty)

        struct socket *so;

        char *ex;

        int do_pty;

{

    /* not implemented */

    return 0;

}

#else

int

openpty(amaster, aslave)

        int *amaster, *aslave;

{

        register int master, slave;

#ifdef HAVE_GRANTPT

        char *ptr;

        if ((master = open("/dev/ptmx", O_RDWR)) < 0 ||

            grantpt(master) < 0 ||

            unlockpt(master) < 0 ||

            (ptr = ptsname(master)) == NULL)  {

                close(master);

                return -1;

        }

        if ((slave = open(ptr, O_RDWR)) < 0 ||

            ioctl(slave, I_PUSH, "ptem") < 0 ||

            ioctl(slave, I_PUSH, "ldterm") < 0 ||

            ioctl(slave, I_PUSH, "ttcompat") < 0) {

                close(master);

                close(slave);

                return -1;

        }

        *amaster = master;

        *aslave = slave;

        return 0;

#else

        static char line[] = "/dev/ptyXX";

        register const char *cp1, *cp2;

        for (cp1 = "pqrsPQRS"; *cp1; cp1++) {

                line[8] = *cp1;

                for (cp2 = "0123456789abcdefghijklmnopqrstuv"; *cp2; cp2++) {

                        line[9] = *cp2;

                        if ((master = open(line, O_RDWR, 0)) == -1) {

                                if (errno == ENOENT)

                                   return (-1);    /* out of ptys */

                        } else {

                                line[5] = 't';

                                /* These will fail */

                                (void) chown(line, getuid(), 0);

                                (void) chmod(line, S_IRUSR|S_IWUSR|S_IWGRP);

#ifdef HAVE_REVOKE

                                (void) revoke(line);

#endif

                                if ((slave = open(line, O_RDWR, 0)) != -1) {

                                        *amaster = master;

                                        *aslave = slave;

                                        return 0;

                                }

                                (void) close(master);

                                line[5] = 'p';

                        }

                }

        }

        errno = ENOENT; /* out of ptys */

        return (-1);

#endif

}

/*

 * XXX This is ugly

 * We create and bind a socket, then fork off to another

 * process, which connects to this socket, after which we

 * exec the wanted program.  If something (strange) happens,

 * the accept() call could block us forever.

 * 

 * do_pty = 0   Fork/exec inetd style

 * do_pty = 1   Fork/exec using slirp.telnetd

 * do_ptr = 2   Fork/exec using pty

 */

int

fork_exec(so, ex, do_pty)

        struct socket *so;

        char *ex;

        int do_pty;

{

        int s;

        struct sockaddr_in addr;

        int addrlen = sizeof(addr);

        int opt;

        int master;

        char *argv[256];

#if 0

        char buff[256];

#endif

        /* don't want to clobber the original */

        char *bptr;

        char *curarg;

        int c, i;

        DEBUG_CALL("fork_exec");

        DEBUG_ARG("so = %lx", (long)so);

        DEBUG_ARG("ex = %lx", (long)ex);

        DEBUG_ARG("do_pty = %lx", (long)do_pty);

        if (do_pty == 2) {

                if (openpty(&master, &s) == -1) {

                        lprint("Error: openpty failed: %s\n", strerror(errno));

                        return 0;

                }

        } else {

                addr.sin_family = AF_INET;

                addr.sin_port = 0;

                addr.sin_addr.s_addr = INADDR_ANY;

                if ((s = socket(AF_INET, SOCK_STREAM, 0)) < 0 ||

                    bind(s, (struct sockaddr *)&addr, addrlen) < 0 ||

                    listen(s, 1) < 0) {

                        lprint("Error: inet socket: %s\n", strerror(errno));

                        closesocket(s);

                        return 0;

                }

        }

        switch(fork()) {

         case -1:

                lprint("Error: fork failed: %s\n", strerror(errno));

                close(s);

                if (do_pty == 2)

                   close(master);

                return 0;

         case 0:

                /* Set the DISPLAY */

                if (do_pty == 2) {

                        (void) close(master);

#ifdef TIOCSCTTY /* XXXXX */

                        (void) setsid();

                        ioctl(s, TIOCSCTTY, (char *)NULL);

#endif

                } else {

                        getsockname(s, (struct sockaddr *)&addr, &addrlen);

                        close(s);

                        /*

                         * Connect to the socket

                         * XXX If any of these fail, we're in trouble!

                          */

                        s = socket(AF_INET, SOCK_STREAM, 0);

                        addr.sin_addr = loopback_addr;

                        connect(s, (struct sockaddr *)&addr, addrlen);

                }

#if 0

                if (x_port >= 0) {

#ifdef HAVE_SETENV

                        sprintf(buff, "%s:%d.%d", inet_ntoa(our_addr), x_port, x_screen);

                        setenv("DISPLAY", buff, 1);

#else

                        sprintf(buff, "DISPLAY=%s:%d.%d", inet_ntoa(our_addr), x_port, x_screen);

                        putenv(buff);

#endif

                }

#endif        

                dup2(s, 0);

                dup2(s, 1);

                dup2(s, 2);

                for (s = 3; s <= 255; s++)

                   close(s);

                i = 0;

                bptr = strdup(ex); /* No need to free() this */

                if (do_pty == 1) {

                        /* Setup "slirp.telnetd -x" */

                        argv[i++] = "slirp.telnetd";

                        argv[i++] = "-x";

                        argv[i++] = bptr;

                } else

                   do {

                        /* Change the string into argv[] */

                        curarg = bptr;

                        while (*bptr != ' ' && *bptr != (char)0)

                           bptr++;

                        c = *bptr;

                        *bptr++ = (char)0;

                        argv[i++] = strdup(curarg);

                   } while (c);

                argv[i] = 0;

                execvp(argv[0], argv);

                /* Ooops, failed, let's tell the user why */

                  {

                          char buff[256];

                          sprintf(buff, "Error: execvp of %s failed: %s\n", 

                                  argv[0], strerror(errno));

                          write(2, buff, strlen(buff)+1);

                  }

                close(0); close(1); close(2); /* XXX */

                exit(1);

         default:

                if (do_pty == 2) {

                        close(s);

                        so->s = master;

                } else {

                        /*

                         * XXX this could block us...

                         * XXX Should set a timer here, and if accept() doesn't

                          * return after X seconds, declare it a failure

                          * The only reason this will block forever is if socket()

                          * of connect() fail in the child process

                          */

                        so->s = accept(s, (struct sockaddr *)&addr, &addrlen);

                        closesocket(s);

                        opt = 1;

                        setsockopt(so->s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int));

                        opt = 1;

                        setsockopt(so->s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int));

                }

                fd_nonblock(so->s);

                /* Append the telnet options now */

                if (so->so_m != 0 && do_pty == 1)  {

                        sbappend(so, so->so_m);

                        so->so_m = 0;

                }

                return 1;

        }

}

#endif

#ifndef HAVE_STRDUP

char *

strdup(str)

        const char *str;

{

        char *bptr;

        bptr = (char *)malloc(strlen(str)+1);

        strcpy(bptr, str);

        return bptr;

}

#endif

#if 0

void

snooze_hup(num)

        int num;

{

        int s, ret;

#ifndef NO_UNIX_SOCKETS

        struct sockaddr_un sock_un;

#endif

        struct sockaddr_in sock_in;

        char buff[256];

        ret = -1;

        if (slirp_socket_passwd) {

                s = socket(AF_INET, SOCK_STREAM, 0);

                if (s < 0)

                   slirp_exit(1);

                sock_in.sin_family = AF_INET;

                sock_in.sin_addr.s_addr = slirp_socket_addr;

                sock_in.sin_port = htons(slirp_socket_port);

                if (connect(s, (struct sockaddr *)&sock_in, sizeof(sock_in)) != 0)

                   slirp_exit(1); /* just exit...*/

                sprintf(buff, "kill %s:%d", slirp_socket_passwd, slirp_socket_unit);

                write(s, buff, strlen(buff)+1);

        }

#ifndef NO_UNIX_SOCKETS

          else {

                s = socket(AF_UNIX, SOCK_STREAM, 0);

                if (s < 0)

                   slirp_exit(1);

                sock_un.sun_family = AF_UNIX;

                strcpy(sock_un.sun_path, socket_path);

                if (connect(s, (struct sockaddr *)&sock_un,

                              sizeof(sock_un.sun_family) + sizeof(sock_un.sun_path)) != 0)

                   slirp_exit(1);

                sprintf(buff, "kill none:%d", slirp_socket_unit);

                write(s, buff, strlen(buff)+1);

        }

#endif

        slirp_exit(0);

}

void

snooze()

{

        sigset_t s;

        int i;

        /* Don't need our data anymore */

        /* XXX This makes SunOS barf */

/*        brk(0); */

        /* Close all fd's */

        for (i = 255; i >= 0; i--)

           close(i);

        signal(SIGQUIT, slirp_exit);

        signal(SIGHUP, snooze_hup);

        sigemptyset(&s);

        /* Wait for any signal */

        sigsuspend(&s);

        /* Just in case ... */

        exit(255);

}

void

relay(s)

        int s;

{

        char buf[8192];

        int n;

        fd_set readfds;

        struct ttys *ttyp;

        /* Don't need our data anymore */

        /* XXX This makes SunOS barf */

/*        brk(0); */

        signal(SIGQUIT, slirp_exit);

        signal(SIGHUP, slirp_exit);

        signal(SIGINT, slirp_exit);

        signal(SIGTERM, slirp_exit);

        /* Fudge to get term_raw and term_restore to work */

        if (NULL == (ttyp = tty_attach (0, slirp_tty))) {

         lprint ("Error: tty_attach failed in misc.c:relay()\r\n");

         slirp_exit (1);

    }

        ttyp->fd = 0;

        ttyp->flags |= TTY_CTTY;

        term_raw(ttyp);

        while (1) {

                FD_ZERO(&readfds);

                FD_SET(0, &readfds);

                FD_SET(s, &readfds);

                n = select(s+1, &readfds, (fd_set *)0, (fd_set *)0, (struct timeval *)0);

                if (n <= 0)

                   slirp_exit(0);

                if (FD_ISSET(0, &readfds)) {

                        n = read(0, buf, 8192);

                        if (n <= 0)

                           slirp_exit(0);

                        n = writen(s, buf, n);

                        if (n <= 0)

                           slirp_exit(0);

                }

                if (FD_ISSET(s, &readfds)) {

                        n = read(s, buf, 8192);

                        if (n <= 0)

                           slirp_exit(0);

                        n = writen(0, buf, n);

                        if (n <= 0)

                           slirp_exit(0);

                }

        }

        /* Just in case.... */

        exit(1);

}

#endif

int (*lprint_print) _P((void *, const char *, va_list));

char *lprint_ptr, *lprint_ptr2, **lprint_arg;

void

#ifdef __STDC__

lprint(const char *format, ...)

#else

lprint(va_alist) va_dcl

#endif

{

        va_list args;

#ifdef __STDC__

        va_start(args, format);

#else

        char *format;

        va_start(args);

        format = va_arg(args, char *);

#endif

#if 0

        /* If we're printing to an sbuf, make sure there's enough room */

        /* XXX +100? */

        if (lprint_sb) {

                if ((lprint_ptr - lprint_sb->sb_wptr) >=

                    (lprint_sb->sb_datalen - (strlen(format) + 100))) {

                        int deltaw = lprint_sb->sb_wptr - lprint_sb->sb_data;

                        int deltar = lprint_sb->sb_rptr - lprint_sb->sb_data;

                        int deltap = lprint_ptr -         lprint_sb->sb_data;

                        lprint_sb->sb_data = (char *)realloc(lprint_sb->sb_data,

                                                             lprint_sb->sb_datalen + TCP_SNDSPACE);

                        /* Adjust all values */

                        lprint_sb->sb_wptr = lprint_sb->sb_data + deltaw;

                        lprint_sb->sb_rptr = lprint_sb->sb_data + deltar;

                        lprint_ptr =         lprint_sb->sb_data + deltap;

                        lprint_sb->sb_datalen += TCP_SNDSPACE;

                }

        }

#endif        

        if (lprint_print)

           lprint_ptr += (*lprint_print)(*lprint_arg, format, args);

        /* Check if they want output to be logged to file as well */

        if (lfd) {

                /* 

                 * Remove \r's

                 * otherwise you'll get ^M all over the file

                 */

                int len = strlen(format);

                char *bptr1, *bptr2;

                bptr1 = bptr2 = strdup(format);

                while (len--) {

                        if (*bptr1 == '\r')

                           memcpy(bptr1, bptr1+1, len+1);

                        else

                           bptr1++;

                }

                vfprintf(lfd, bptr2, args);

                free(bptr2);

        }

        va_end(args);

}

void

add_emu(buff)

        char *buff;

{

        u_int lport, fport;

        u_int8_t tos = 0, emu = 0;

        char buff1[256], buff2[256], buff4[128];

        char *buff3 = buff4;

        struct emu_t *emup;

        struct socket *so;

        if (sscanf(buff, "%256s %256s", buff2, buff1) != 2) {

                lprint("Error: Bad arguments\r\n");

                return;

        }

        if (sscanf(buff1, "%d:%d", &lport, &fport) != 2) {

                lport = 0;

                if (sscanf(buff1, "%d", &fport) != 1) {

                        lprint("Error: Bad first argument\r\n");

                        return;

                }

        }

        if (sscanf(buff2, "%128[^:]:%128s", buff1, buff3) != 2) {

                buff3 = 0;

                if (sscanf(buff2, "%256s", buff1) != 1) {

                        lprint("Error: Bad second argument\r\n");

                        return;

                }

        }

        if (buff3) {

                if (strcmp(buff3, "lowdelay") == 0)

                   tos = IPTOS_LOWDELAY;

                else if (strcmp(buff3, "throughput") == 0)

                   tos = IPTOS_THROUGHPUT;

                else {

                        lprint("Error: Expecting \"lowdelay\"/\"throughput\"\r\n");

                        return;

                }

        }

        if (strcmp(buff1, "ftp") == 0)

           emu = EMU_FTP;

        else if (strcmp(buff1, "irc") == 0)

           emu = EMU_IRC;

        else if (strcmp(buff1, "none") == 0)

           emu = EMU_NONE; /* ie: no emulation */

        else {

                lprint("Error: Unknown service\r\n");

                return;

        }

        /* First, check that it isn't already emulated */

        for (emup = tcpemu; emup; emup = emup->next) {

                if (emup->lport == lport && emup->fport == fport) {

                        lprint("Error: port already emulated\r\n");

                        return;

                }

        }

        /* link it */

        emup = (struct emu_t *)malloc(sizeof (struct emu_t));

        emup->lport = (u_int16_t)lport;

        emup->fport = (u_int16_t)fport;

        emup->tos = tos;

        emup->emu = emu;

        emup->next = tcpemu;

        tcpemu = emup;

        /* And finally, mark all current sessions, if any, as being emulated */

        for (so = tcb.so_next; so != &tcb; so = so->so_next) {

                if ((lport && lport == ntohs(so->so_lport)) ||

                    (fport && fport == ntohs(so->so_fport))) {

                        if (emu)

                           so->so_emu = emu;

                        if (tos)

                           so->so_iptos = tos;

                }

        }

        lprint("Adding emulation for %s to port %d/%d\r\n", buff1, emup->lport, emup->fport);

}

#ifdef BAD_SPRINTF

#undef vsprintf

#undef sprintf

/*

 * Some BSD-derived systems have a sprintf which returns char *

 */

int

vsprintf_len(string, format, args)

        char *string;

        const char *format;

        va_list args;

{

        vsprintf(string, format, args);

        return strlen(string);

}

int

#ifdef __STDC__

sprintf_len(char *string, const char *format, ...)

#else

sprintf_len(va_alist) va_dcl

#endif

{

        va_list args;

#ifdef __STDC__

        va_start(args, format);

#else

        char *string;

        char *format;

        va_start(args);

        string = va_arg(args, char *);

        format = va_arg(args, char *);

#endif

        vsprintf(string, format, args);

        return strlen(string);

}

#endif

void

u_sleep(usec)

        int usec;

{

        struct timeval t;

        fd_set fdset;

        FD_ZERO(&fdset);

        t.tv_sec = 0;

        t.tv_usec = usec * 1000;

        select(0, &fdset, &fdset, &fdset, &t);

}

/*

 * Set fd blocking and non-blocking

 */

void

fd_nonblock(fd)

        int fd;

{

#ifdef FIONBIO

        int opt = 1;

        ioctlsocket(fd, FIONBIO, &opt);

#else

        int opt;

        opt = fcntl(fd, F_GETFL, 0);

        opt |= O_NONBLOCK;

        fcntl(fd, F_SETFL, opt);

#endif

}

void

fd_block(fd)

        int fd;

{

#ifdef FIONBIO

        int opt = 0;

        ioctlsocket(fd, FIONBIO, &opt);

#else

        int opt;

        opt = fcntl(fd, F_GETFL, 0);

        opt &= ~O_NONBLOCK;

        fcntl(fd, F_SETFL, opt);

#endif

}

#if 0

/*

 * invoke RSH

 */

int

rsh_exec(so,ns, user, host, args)

        struct socket *so;

        struct socket *ns;

        char *user;

        char *host;

        char *args;

{

        int fd[2];

        int fd0[2];

        int s;

        char buff[256];

        DEBUG_CALL("rsh_exec");

        DEBUG_ARG("so = %lx", (long)so);

        if (pipe(fd)<0) {

          lprint("Error: pipe failed: %s\n", strerror(errno));

          return 0;

        }

/* #ifdef HAVE_SOCKETPAIR */

#if 1

        if (socketpair(PF_UNIX,SOCK_STREAM,0, fd0) == -1) {

          close(fd[0]);

          close(fd[1]);

          lprint("Error: openpty failed: %s\n", strerror(errno));

          return 0;

        }

#else

        if (openpty(&fd0[0], &fd0[1]) == -1) {

          close(fd[0]);

          close(fd[1]);

          lprint("Error: openpty failed: %s\n", strerror(errno));

          return 0;

        }

#endif

        switch(fork()) {

         case -1:

           lprint("Error: fork failed: %s\n", strerror(errno));

           close(fd[0]);

           close(fd[1]);

           close(fd0[0]);

           close(fd0[1]);

           return 0;

         case 0:

           close(fd[0]);

           close(fd0[0]);

                /* Set the DISPLAY */

           if (x_port >= 0) {

#ifdef HAVE_SETENV

             sprintf(buff, "%s:%d.%d", inet_ntoa(our_addr), x_port, x_screen);

             setenv("DISPLAY", buff, 1);

#else

             sprintf(buff, "DISPLAY=%s:%d.%d", inet_ntoa(our_addr), x_port, x_screen);

             putenv(buff);

#endif

           }

           dup2(fd0[1], 0);

           dup2(fd0[1], 1);

           dup2(fd[1], 2);

           for (s = 3; s <= 255; s++)

             close(s);

           execlp("rsh","rsh","-l", user, host, args, NULL);

           /* Ooops, failed, let's tell the user why */

           sprintf(buff, "Error: execlp of %s failed: %s\n", 

                   "rsh", strerror(errno));

           write(2, buff, strlen(buff)+1);

           close(0); close(1); close(2); /* XXX */

           exit(1);

        default:

          close(fd[1]);

          close(fd0[1]);

          ns->s=fd[0];

          so->s=fd0[0];

          return 1;

        }

}

#endif