Archipelago » qemu

/*

 *  Linux syscalls

 * 

 *  Copyright (c) 2003 Fabrice Bellard

 *

 *  This program is free software; you can redistribute it and/or modify

 *  it under the terms of the GNU General Public License as published by

 *  the Free Software Foundation; either version 2 of the License, or

 *  (at your option) any later version.

 *

 *  This program is distributed in the hope that it will be useful,

 *  but WITHOUT ANY WARRANTY; without even the implied warranty of

 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 *  GNU General Public License for more details.

 *

 *  You should have received a copy of the GNU General Public License

 *  along with this program; if not, write to the Free Software

 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

 */

#include <stdlib.h>

#include <stdio.h>

#include <stdarg.h>

#include <string.h>

#include <elf.h>

#include <endian.h>

#include <errno.h>

#include <unistd.h>

#include <fcntl.h>

#include <time.h>

#include <sys/types.h>

#include <sys/wait.h>

#include <sys/time.h>

#include <sys/stat.h>

#include <sys/mount.h>

#include <sys/prctl.h>

#include <sys/resource.h>

#include <sys/mman.h>

#include <sys/swap.h>

#include <signal.h>

#include <sched.h>

#include <sys/socket.h>

#include <sys/uio.h>

#include <sys/poll.h>

#include <sys/times.h>

#include <sys/shm.h>

#include <sys/sem.h>

#include <sys/statfs.h>

#include <utime.h>

#include <sys/sysinfo.h>

//#include <sys/user.h>

#include <netinet/ip.h>

#include <netinet/tcp.h>

#define termios host_termios

#define winsize host_winsize

#define termio host_termio

#define sgttyb host_sgttyb /* same as target */

#define tchars host_tchars /* same as target */

#define ltchars host_ltchars /* same as target */

#include <linux/termios.h>

#include <linux/unistd.h>

#include <linux/utsname.h>

#include <linux/cdrom.h>

#include <linux/hdreg.h>

#include <linux/soundcard.h>

#include <linux/dirent.h>

#include <linux/kd.h>

#include "qemu.h"

//#define DEBUG

#if defined(TARGET_I386) || defined(TARGET_ARM) || defined(TARGET_SPARC) \

    || defined(TARGET_M68K)

/* 16 bit uid wrappers emulation */

#define USE_UID16

#endif

//#include <linux/msdos_fs.h>

#define        VFAT_IOCTL_READDIR_BOTH                _IOR('r', 1, struct dirent [2])

#define        VFAT_IOCTL_READDIR_SHORT        _IOR('r', 2, struct dirent [2])

#undef _syscall0

#undef _syscall1

#undef _syscall2

#undef _syscall3

#undef _syscall4

#undef _syscall5

#undef _syscall6

#define _syscall0(type,name)                \

type name (void)                        \

{                                        \

        return syscall(__NR_##name);        \

}

#define _syscall1(type,name,type1,arg1)                \

type name (type1 arg1)                                \

{                                                \

        return syscall(__NR_##name, arg1);        \

}

#define _syscall2(type,name,type1,arg1,type2,arg2)        \

type name (type1 arg1,type2 arg2)                        \

{                                                        \

        return syscall(__NR_##name, arg1, arg2);        \

}

#define _syscall3(type,name,type1,arg1,type2,arg2,type3,arg3)        \

type name (type1 arg1,type2 arg2,type3 arg3)                        \

{                                                                \

        return syscall(__NR_##name, arg1, arg2, arg3);                \

}

#define _syscall4(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4)        \

type name (type1 arg1,type2 arg2,type3 arg3,type4 arg4)                                \

{                                                                                \

        return syscall(__NR_##name, arg1, arg2, arg3, arg4);                        \

}

#define _syscall5(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4,        \

                  type5,arg5)                                                        \

type name (type1 arg1,type2 arg2,type3 arg3,type4 arg4,type5 arg5)                \

{                                                                                \

        return syscall(__NR_##name, arg1, arg2, arg3, arg4, arg5);                \

}

#define _syscall6(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4,        \

                  type5,arg5,type6,arg6)                                        \

type name (type1 arg1,type2 arg2,type3 arg3,type4 arg4,type5 arg5,type6 arg6)        \

{                                                                                \

        return syscall(__NR_##name, arg1, arg2, arg3, arg4, arg5, arg6);        \

}

#define __NR_sys_uname __NR_uname

#define __NR_sys_getcwd1 __NR_getcwd

#define __NR_sys_getdents __NR_getdents

#define __NR_sys_getdents64 __NR_getdents64

#define __NR_sys_rt_sigqueueinfo __NR_rt_sigqueueinfo

#define __NR_sys_syslog __NR_syslog

#if defined(__alpha__) || defined (__ia64__) || defined(__x86_64__)

#define __NR__llseek __NR_lseek

#endif

#ifdef __NR_gettid

_syscall0(int, gettid)

#else

static int gettid(void) {

    return -ENOSYS;

}

#endif

_syscall1(int,sys_uname,struct new_utsname *,buf)

_syscall2(int,sys_getcwd1,char *,buf,size_t,size)

_syscall3(int, sys_getdents, uint, fd, struct dirent *, dirp, uint, count);

_syscall3(int, sys_getdents64, uint, fd, struct dirent64 *, dirp, uint, count);

_syscall5(int, _llseek,  uint,  fd, ulong, hi, ulong, lo,

          loff_t *, res, uint, wh);

_syscall3(int,sys_rt_sigqueueinfo,int,pid,int,sig,siginfo_t *,uinfo)

_syscall3(int,sys_syslog,int,type,char*,bufp,int,len)

#ifdef __NR_exit_group

_syscall1(int,exit_group,int,error_code)

#endif

#if defined(TARGET_NR_set_tid_address) && defined(__NR_set_tid_address)

_syscall1(int,set_tid_address,int *,tidptr)

#endif

extern int personality(int);

extern int flock(int, int);

extern int setfsuid(int);

extern int setfsgid(int);

extern int setresuid(uid_t, uid_t, uid_t);

extern int getresuid(uid_t *, uid_t *, uid_t *);

extern int setresgid(gid_t, gid_t, gid_t);

extern int getresgid(gid_t *, gid_t *, gid_t *);

extern int setgroups(int, gid_t *);

static inline long get_errno(long ret)

{

    if (ret == -1)

        return -errno;

    else

        return ret;

}

static inline int is_error(long ret)

{

    return (unsigned long)ret >= (unsigned long)(-4096);

}

static target_ulong target_brk;

static target_ulong target_original_brk;

void target_set_brk(target_ulong new_brk)

{

    target_original_brk = target_brk = new_brk;

}

long do_brk(target_ulong new_brk)

{

    target_ulong brk_page;

    long mapped_addr;

    int        new_alloc_size;

    if (!new_brk)

        return target_brk;

    if (new_brk < target_original_brk)

        return -ENOMEM;

    brk_page = HOST_PAGE_ALIGN(target_brk);

    /* If the new brk is less than this, set it and we're done... */

    if (new_brk < brk_page) {

        target_brk = new_brk;

            return target_brk;

    }

    /* We need to allocate more memory after the brk... */

    new_alloc_size = HOST_PAGE_ALIGN(new_brk - brk_page + 1);

    mapped_addr = get_errno(target_mmap(brk_page, new_alloc_size, 

                                        PROT_READ|PROT_WRITE,

                                        MAP_ANON|MAP_FIXED|MAP_PRIVATE, 0, 0));

    if (is_error(mapped_addr)) {

        return mapped_addr;

    } else {

        target_brk = new_brk;

            return target_brk;

    }

}

static inline fd_set *target_to_host_fds(fd_set *fds, 

                                         target_long *target_fds, int n)

{

#if !defined(BSWAP_NEEDED) && !defined(WORDS_BIGENDIAN)

    return (fd_set *)target_fds;

#else

    int i, b;

    if (target_fds) {

        FD_ZERO(fds);

        for(i = 0;i < n; i++) {

            b = (tswapl(target_fds[i / TARGET_LONG_BITS]) >>

                 (i & (TARGET_LONG_BITS - 1))) & 1;

            if (b)

                FD_SET(i, fds);

        }

        return fds;

    } else {

        return NULL;

    }

#endif

}

static inline void host_to_target_fds(target_long *target_fds, 

                                      fd_set *fds, int n)

{

#if !defined(BSWAP_NEEDED) && !defined(WORDS_BIGENDIAN)

    /* nothing to do */

#else

    int i, nw, j, k;

    target_long v;

    if (target_fds) {

        nw = (n + TARGET_LONG_BITS - 1) / TARGET_LONG_BITS;

        k = 0;

        for(i = 0;i < nw; i++) {

            v = 0;

            for(j = 0; j < TARGET_LONG_BITS; j++) {

                v |= ((FD_ISSET(k, fds) != 0) << j);

                k++;

            }

            target_fds[i] = tswapl(v);

        }

    }

#endif

}

#if defined(__alpha__)

#define HOST_HZ 1024

#else

#define HOST_HZ 100

#endif

static inline long host_to_target_clock_t(long ticks)

{

#if HOST_HZ == TARGET_HZ

    return ticks;

#else

    return ((int64_t)ticks * TARGET_HZ) / HOST_HZ;

#endif

}

static inline void host_to_target_rusage(target_ulong target_addr,

                                         const struct rusage *rusage)

{

    struct target_rusage *target_rusage;

    lock_user_struct(target_rusage, target_addr, 0);

    target_rusage->ru_utime.tv_sec = tswapl(rusage->ru_utime.tv_sec);

    target_rusage->ru_utime.tv_usec = tswapl(rusage->ru_utime.tv_usec);

    target_rusage->ru_stime.tv_sec = tswapl(rusage->ru_stime.tv_sec);

    target_rusage->ru_stime.tv_usec = tswapl(rusage->ru_stime.tv_usec);

    target_rusage->ru_maxrss = tswapl(rusage->ru_maxrss);

    target_rusage->ru_ixrss = tswapl(rusage->ru_ixrss);

    target_rusage->ru_idrss = tswapl(rusage->ru_idrss);

    target_rusage->ru_isrss = tswapl(rusage->ru_isrss);

    target_rusage->ru_minflt = tswapl(rusage->ru_minflt);

    target_rusage->ru_majflt = tswapl(rusage->ru_majflt);

    target_rusage->ru_nswap = tswapl(rusage->ru_nswap);

    target_rusage->ru_inblock = tswapl(rusage->ru_inblock);

    target_rusage->ru_oublock = tswapl(rusage->ru_oublock);

    target_rusage->ru_msgsnd = tswapl(rusage->ru_msgsnd);

    target_rusage->ru_msgrcv = tswapl(rusage->ru_msgrcv);

    target_rusage->ru_nsignals = tswapl(rusage->ru_nsignals);

    target_rusage->ru_nvcsw = tswapl(rusage->ru_nvcsw);

    target_rusage->ru_nivcsw = tswapl(rusage->ru_nivcsw);

    unlock_user_struct(target_rusage, target_addr, 1);

}

static inline void target_to_host_timeval(struct timeval *tv,

                                          target_ulong target_addr)

{

    struct target_timeval *target_tv;

    lock_user_struct(target_tv, target_addr, 1);

    tv->tv_sec = tswapl(target_tv->tv_sec);

    tv->tv_usec = tswapl(target_tv->tv_usec);

    unlock_user_struct(target_tv, target_addr, 0);

}

static inline void host_to_target_timeval(target_ulong target_addr,

                                          const struct timeval *tv)

{

    struct target_timeval *target_tv;

    lock_user_struct(target_tv, target_addr, 0);

    target_tv->tv_sec = tswapl(tv->tv_sec);

    target_tv->tv_usec = tswapl(tv->tv_usec);

    unlock_user_struct(target_tv, target_addr, 1);

}

static long do_select(long n, 

                      target_ulong rfd_p, target_ulong wfd_p, 

                      target_ulong efd_p, target_ulong target_tv)

{

    fd_set rfds, wfds, efds;

    fd_set *rfds_ptr, *wfds_ptr, *efds_ptr;

    target_long *target_rfds, *target_wfds, *target_efds;

    struct timeval tv, *tv_ptr;

    long ret;

    int ok;

    if (rfd_p) {

        target_rfds = lock_user(rfd_p, sizeof(target_long) * n, 1);

        rfds_ptr = target_to_host_fds(&rfds, target_rfds, n);

    } else {

        target_rfds = NULL;

        rfds_ptr = NULL;

    }

    if (wfd_p) {

        target_wfds = lock_user(wfd_p, sizeof(target_long) * n, 1);

        wfds_ptr = target_to_host_fds(&wfds, target_wfds, n);

    } else {

        target_wfds = NULL;

        wfds_ptr = NULL;

    }

    if (efd_p) {

        target_efds = lock_user(efd_p, sizeof(target_long) * n, 1);

        efds_ptr = target_to_host_fds(&efds, target_efds, n);

    } else {

        target_efds = NULL;

        efds_ptr = NULL;

    }

    if (target_tv) {

        target_to_host_timeval(&tv, target_tv);

        tv_ptr = &tv;

    } else {

        tv_ptr = NULL;

    }

    ret = get_errno(select(n, rfds_ptr, wfds_ptr, efds_ptr, tv_ptr));

    ok = !is_error(ret);

    if (ok) {

        host_to_target_fds(target_rfds, rfds_ptr, n);

        host_to_target_fds(target_wfds, wfds_ptr, n);

        host_to_target_fds(target_efds, efds_ptr, n);

        if (target_tv) {

            host_to_target_timeval(target_tv, &tv);

        }

    }

    if (target_rfds)

        unlock_user(target_rfds, rfd_p, ok ? sizeof(target_long) * n : 0);

    if (target_wfds)

        unlock_user(target_wfds, wfd_p, ok ? sizeof(target_long) * n : 0);

    if (target_efds)

        unlock_user(target_efds, efd_p, ok ? sizeof(target_long) * n : 0);

    return ret;

}

static inline void target_to_host_sockaddr(struct sockaddr *addr,

                                           target_ulong target_addr,

                                           socklen_t len)

{

    struct target_sockaddr *target_saddr;

    target_saddr = lock_user(target_addr, len, 1);

    memcpy(addr, target_saddr, len);

    addr->sa_family = tswap16(target_saddr->sa_family);

    unlock_user(target_saddr, target_addr, 0);

}

static inline void host_to_target_sockaddr(target_ulong target_addr,

                                           struct sockaddr *addr,

                                           socklen_t len)

{

    struct target_sockaddr *target_saddr;

    target_saddr = lock_user(target_addr, len, 0);

    memcpy(target_saddr, addr, len);

    target_saddr->sa_family = tswap16(addr->sa_family);

    unlock_user(target_saddr, target_addr, len);

}

/* ??? Should this also swap msgh->name?  */

static inline void target_to_host_cmsg(struct msghdr *msgh,

                                       struct target_msghdr *target_msgh)

{

    struct cmsghdr *cmsg = CMSG_FIRSTHDR(msgh);

    struct target_cmsghdr *target_cmsg = TARGET_CMSG_FIRSTHDR(target_msgh);

    socklen_t space = 0;

    while (cmsg && target_cmsg) {

        void *data = CMSG_DATA(cmsg);

        void *target_data = TARGET_CMSG_DATA(target_cmsg);

        int len = tswapl(target_cmsg->cmsg_len) 

                  - TARGET_CMSG_ALIGN(sizeof (struct target_cmsghdr));

        space += CMSG_SPACE(len);

        if (space > msgh->msg_controllen) {

            space -= CMSG_SPACE(len);

            gemu_log("Host cmsg overflow\n");

            break;

        }

        cmsg->cmsg_level = tswap32(target_cmsg->cmsg_level);

        cmsg->cmsg_type = tswap32(target_cmsg->cmsg_type);

        cmsg->cmsg_len = CMSG_LEN(len);

        if (cmsg->cmsg_level != TARGET_SOL_SOCKET || cmsg->cmsg_type != SCM_RIGHTS) {

            gemu_log("Unsupported ancillary data: %d/%d\n", cmsg->cmsg_level, cmsg->cmsg_type);

            memcpy(data, target_data, len);

        } else {

            int *fd = (int *)data;

            int *target_fd = (int *)target_data;

            int i, numfds = len / sizeof(int);

            for (i = 0; i < numfds; i++)

                fd[i] = tswap32(target_fd[i]);

        }

        cmsg = CMSG_NXTHDR(msgh, cmsg);

        target_cmsg = TARGET_CMSG_NXTHDR(target_msgh, target_cmsg);

    }

    msgh->msg_controllen = space;

}

/* ??? Should this also swap msgh->name?  */

static inline void host_to_target_cmsg(struct target_msghdr *target_msgh,

                                       struct msghdr *msgh)

{

    struct cmsghdr *cmsg = CMSG_FIRSTHDR(msgh);

    struct target_cmsghdr *target_cmsg = TARGET_CMSG_FIRSTHDR(target_msgh);

    socklen_t space = 0;

    while (cmsg && target_cmsg) {

        void *data = CMSG_DATA(cmsg);

        void *target_data = TARGET_CMSG_DATA(target_cmsg);

        int len = cmsg->cmsg_len - CMSG_ALIGN(sizeof (struct cmsghdr));

        space += TARGET_CMSG_SPACE(len);

        if (space > tswapl(target_msgh->msg_controllen)) {

            space -= TARGET_CMSG_SPACE(len);

            gemu_log("Target cmsg overflow\n");

            break;

        }

        target_cmsg->cmsg_level = tswap32(cmsg->cmsg_level);

        target_cmsg->cmsg_type = tswap32(cmsg->cmsg_type);

        target_cmsg->cmsg_len = tswapl(TARGET_CMSG_LEN(len));

        if (cmsg->cmsg_level != TARGET_SOL_SOCKET || cmsg->cmsg_type != SCM_RIGHTS) {

            gemu_log("Unsupported ancillary data: %d/%d\n", cmsg->cmsg_level, cmsg->cmsg_type);

            memcpy(target_data, data, len);

        } else {

            int *fd = (int *)data;

            int *target_fd = (int *)target_data;

            int i, numfds = len / sizeof(int);

            for (i = 0; i < numfds; i++)

                target_fd[i] = tswap32(fd[i]);

        }

        cmsg = CMSG_NXTHDR(msgh, cmsg);

        target_cmsg = TARGET_CMSG_NXTHDR(target_msgh, target_cmsg);

    }

    msgh->msg_controllen = tswapl(space);

}

static long do_setsockopt(int sockfd, int level, int optname, 

                          target_ulong optval, socklen_t optlen)

{

    int val, ret;

    switch(level) {

    case SOL_TCP:

        /* TCP options all take an 'int' value.  */

        if (optlen < sizeof(uint32_t))

            return -EINVAL;

        val = tget32(optval);

        ret = get_errno(setsockopt(sockfd, level, optname, &val, sizeof(val)));

        break;

    case SOL_IP:

        switch(optname) {

        case IP_TOS:

        case IP_TTL:

        case IP_HDRINCL:

        case IP_ROUTER_ALERT:

        case IP_RECVOPTS:

        case IP_RETOPTS:

        case IP_PKTINFO:

        case IP_MTU_DISCOVER:

        case IP_RECVERR:

        case IP_RECVTOS:

#ifdef IP_FREEBIND

        case IP_FREEBIND:

#endif

        case IP_MULTICAST_TTL:

        case IP_MULTICAST_LOOP:

            val = 0;

            if (optlen >= sizeof(uint32_t)) {

                val = tget32(optval);

            } else if (optlen >= 1) {

                val = tget8(optval);

            }

            ret = get_errno(setsockopt(sockfd, level, optname, &val, sizeof(val)));

            break;

        default:

            goto unimplemented;

        }

        break;

    case TARGET_SOL_SOCKET:

        switch (optname) {

            /* Options with 'int' argument.  */

        case TARGET_SO_DEBUG:

                optname = SO_DEBUG;

                break;

        case TARGET_SO_REUSEADDR:

                optname = SO_REUSEADDR;

                break;

        case TARGET_SO_TYPE:

                optname = SO_TYPE;

                break;

        case TARGET_SO_ERROR:

                optname = SO_ERROR;

                break;

        case TARGET_SO_DONTROUTE:

                optname = SO_DONTROUTE;

                break;

        case TARGET_SO_BROADCAST:

                optname = SO_BROADCAST;

                break;

        case TARGET_SO_SNDBUF:

                optname = SO_SNDBUF;

                break;

        case TARGET_SO_RCVBUF:

                optname = SO_RCVBUF;

                break;

        case TARGET_SO_KEEPALIVE:

                optname = SO_KEEPALIVE;

                break;

        case TARGET_SO_OOBINLINE:

                optname = SO_OOBINLINE;

                break;

        case TARGET_SO_NO_CHECK:

                optname = SO_NO_CHECK;

                break;

        case TARGET_SO_PRIORITY:

                optname = SO_PRIORITY;

                break;

#ifdef SO_BSDCOMPAT

        case TARGET_SO_BSDCOMPAT:

                optname = SO_BSDCOMPAT;

                break;

#endif

        case TARGET_SO_PASSCRED:

                optname = SO_PASSCRED;

                break;

        case TARGET_SO_TIMESTAMP:

                optname = SO_TIMESTAMP;

                break;

        case TARGET_SO_RCVLOWAT:

                optname = SO_RCVLOWAT;

                break;

        case TARGET_SO_RCVTIMEO:

                optname = SO_RCVTIMEO;

                break;

        case TARGET_SO_SNDTIMEO:

                optname = SO_SNDTIMEO;

                break;

            break;

        default:

            goto unimplemented;

        }

        if (optlen < sizeof(uint32_t))

        return -EINVAL;

        val = tget32(optval);

        ret = get_errno(setsockopt(sockfd, SOL_SOCKET, optname, &val, sizeof(val)));

        break;

    default:

    unimplemented:

        gemu_log("Unsupported setsockopt level=%d optname=%d \n", level, optname);

        ret = -ENOSYS;

    }

    return ret;

}

static long do_getsockopt(int sockfd, int level, int optname, 

                          target_ulong optval, target_ulong optlen)

{

    int len, lv, val, ret;

    switch(level) {

    case TARGET_SOL_SOCKET:

            level = SOL_SOCKET;

        switch (optname) {

        case TARGET_SO_LINGER:

        case TARGET_SO_RCVTIMEO:

        case TARGET_SO_SNDTIMEO:

        case TARGET_SO_PEERCRED:

        case TARGET_SO_PEERNAME:

            /* These don't just return a single integer */

            goto unimplemented;

        default:

            goto int_case;

        }

        break;

    case SOL_TCP:

        /* TCP options all take an 'int' value.  */

    int_case:

        len = tget32(optlen);

        if (len < 0)

            return -EINVAL;

        lv = sizeof(int);

        ret = get_errno(getsockopt(sockfd, level, optname, &val, &lv));

        if (ret < 0)

            return ret;

        val = tswap32(val);

        if (len > lv)

            len = lv;

        if (len == 4)

            tput32(optval, val);

        else

            tput8(optval, val);

        tput32(optlen, len);

        break;

    case SOL_IP:

        switch(optname) {

        case IP_TOS:

        case IP_TTL:

        case IP_HDRINCL:

        case IP_ROUTER_ALERT:

        case IP_RECVOPTS:

        case IP_RETOPTS:

        case IP_PKTINFO:

        case IP_MTU_DISCOVER:

        case IP_RECVERR:

        case IP_RECVTOS:

#ifdef IP_FREEBIND

        case IP_FREEBIND:

#endif

        case IP_MULTICAST_TTL:

        case IP_MULTICAST_LOOP:

            len = tget32(optlen);

            if (len < 0)

                return -EINVAL;

            lv = sizeof(int);

            ret = get_errno(getsockopt(sockfd, level, optname, &val, &lv));

            if (ret < 0)

                return ret;

            if (len < sizeof(int) && len > 0 && val >= 0 && val < 255) {

                len = 1;

                tput32(optlen, len);

                tput8(optval, val);

            } else {

                if (len > sizeof(int))

                    len = sizeof(int);

                tput32(optlen, len);

                tput32(optval, val);

            }

            break;

        default:

            goto unimplemented;

        }

        break;

    default:

    unimplemented:

        gemu_log("getsockopt level=%d optname=%d not yet supported\n",

                 level, optname);

        ret = -ENOSYS;

        break;

    }

    return ret;

}

static void lock_iovec(struct iovec *vec, target_ulong target_addr,

                       int count, int copy)

{

    struct target_iovec *target_vec;

    target_ulong base;

    int i;

    target_vec = lock_user(target_addr, count * sizeof(struct target_iovec), 1);

    for(i = 0;i < count; i++) {

        base = tswapl(target_vec[i].iov_base);

        vec[i].iov_len = tswapl(target_vec[i].iov_len);

        vec[i].iov_base = lock_user(base, vec[i].iov_len, copy);

    }

    unlock_user (target_vec, target_addr, 0);

}

static void unlock_iovec(struct iovec *vec, target_ulong target_addr,

                         int count, int copy)

{

    struct target_iovec *target_vec;

    target_ulong base;

    int i;

    target_vec = lock_user(target_addr, count * sizeof(struct target_iovec), 1);

    for(i = 0;i < count; i++) {

        base = tswapl(target_vec[i].iov_base);

        unlock_user(vec[i].iov_base, base, copy ? vec[i].iov_len : 0);

    }

    unlock_user (target_vec, target_addr, 0);

}

static long do_socket(int domain, int type, int protocol)

{

#if defined(TARGET_MIPS)

    switch(type) {

    case TARGET_SOCK_DGRAM:

        type = SOCK_DGRAM;

        break;

    case TARGET_SOCK_STREAM:

        type = SOCK_STREAM;

        break;

    case TARGET_SOCK_RAW:

        type = SOCK_RAW;

        break;

    case TARGET_SOCK_RDM:

        type = SOCK_RDM;

        break;

    case TARGET_SOCK_SEQPACKET:

        type = SOCK_SEQPACKET;

        break;

    case TARGET_SOCK_PACKET:

        type = SOCK_PACKET;

        break;

    }

#endif

    return get_errno(socket(domain, type, protocol));

}

static long do_bind(int sockfd, target_ulong target_addr,

                    socklen_t addrlen)

{

    void *addr = alloca(addrlen);

    target_to_host_sockaddr(addr, target_addr, addrlen);

    return get_errno(bind(sockfd, addr, addrlen));

}

static long do_connect(int sockfd, target_ulong target_addr,

                    socklen_t addrlen)

{

    void *addr = alloca(addrlen);

    target_to_host_sockaddr(addr, target_addr, addrlen);

    return get_errno(connect(sockfd, addr, addrlen));

}

static long do_sendrecvmsg(int fd, target_ulong target_msg,

                           int flags, int send)

{

    long ret;

    struct target_msghdr *msgp;

    struct msghdr msg;

    int count;

    struct iovec *vec;

    target_ulong target_vec;

    lock_user_struct(msgp, target_msg, 1);

    if (msgp->msg_name) {

        msg.msg_namelen = tswap32(msgp->msg_namelen);

        msg.msg_name = alloca(msg.msg_namelen);

        target_to_host_sockaddr(msg.msg_name, tswapl(msgp->msg_name),

                                msg.msg_namelen);

    } else {

        msg.msg_name = NULL;

        msg.msg_namelen = 0;

    }

    msg.msg_controllen = 2 * tswapl(msgp->msg_controllen);

    msg.msg_control = alloca(msg.msg_controllen);

    msg.msg_flags = tswap32(msgp->msg_flags);

    count = tswapl(msgp->msg_iovlen);

    vec = alloca(count * sizeof(struct iovec));

    target_vec = tswapl(msgp->msg_iov);

    lock_iovec(vec, target_vec, count, send);

    msg.msg_iovlen = count;

    msg.msg_iov = vec;

    if (send) {

        target_to_host_cmsg(&msg, msgp);

        ret = get_errno(sendmsg(fd, &msg, flags));

    } else {

        ret = get_errno(recvmsg(fd, &msg, flags));

        if (!is_error(ret))

            host_to_target_cmsg(msgp, &msg);

    }

    unlock_iovec(vec, target_vec, count, !send);

    return ret;

}

static long do_accept(int fd, target_ulong target_addr,

                      target_ulong target_addrlen)

{

    socklen_t addrlen = tget32(target_addrlen);

    void *addr = alloca(addrlen);

    long ret;

    ret = get_errno(accept(fd, addr, &addrlen));

    if (!is_error(ret)) {

        host_to_target_sockaddr(target_addr, addr, addrlen);

        tput32(target_addrlen, addrlen);

    }

    return ret;

}

static long do_getpeername(int fd, target_ulong target_addr,

                           target_ulong target_addrlen)

{

    socklen_t addrlen = tget32(target_addrlen);

    void *addr = alloca(addrlen);

    long ret;

    ret = get_errno(getpeername(fd, addr, &addrlen));

    if (!is_error(ret)) {

        host_to_target_sockaddr(target_addr, addr, addrlen);

        tput32(target_addrlen, addrlen);

    }

    return ret;

}

static long do_getsockname(int fd, target_ulong target_addr,

                           target_ulong target_addrlen)

{

    socklen_t addrlen = tget32(target_addrlen);

    void *addr = alloca(addrlen);

    long ret;

    ret = get_errno(getsockname(fd, addr, &addrlen));

    if (!is_error(ret)) {

        host_to_target_sockaddr(target_addr, addr, addrlen);

        tput32(target_addrlen, addrlen);

    }

    return ret;

}

static long do_socketpair(int domain, int type, int protocol,

                          target_ulong target_tab)

{

    int tab[2];