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sys_sunos.c

/* $Id: sys_sunos.c,v 1.137 2002/02/08 03:57:14 davem Exp $
 * sys_sunos.c: SunOS specific syscall compatibility support.
 *
 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
 * Copyright (C) 1995 Miguel de Icaza (miguel@nuclecu.unam.mx)
 *
 * Based upon preliminary work which is:
 *
 * Copyright (C) 1995 Adrian M. Rodriguez (adrian@remus.rutgers.edu)
 *
 */

#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/mman.h>
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/resource.h>
#include <linux/ipc.h>
#include <linux/shm.h>
#include <linux/msg.h>
#include <linux/sem.h>
#include <linux/signal.h>
#include <linux/uio.h>
#include <linux/utsname.h>
#include <linux/major.h>
#include <linux/stat.h>
#include <linux/slab.h>
#include <linux/pagemap.h>
#include <linux/capability.h>
#include <linux/errno.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/syscalls.h>

#include <net/sock.h>

#include <asm/uaccess.h>
#ifndef KERNEL_DS
#include <linux/segment.h>
#endif

#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/pconf.h>
#include <asm/idprom.h> /* for gethostid() */
#include <asm/unistd.h>
#include <asm/system.h>

/* For the nfs mount emulation */
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/nfs.h>
#include <linux/nfs2.h>
#include <linux/nfs_mount.h>

/* for sunos_select */
#include <linux/time.h>
#include <linux/personality.h>

/* NR_OPEN is now larger and dynamic in recent kernels. */
#define SUNOS_NR_OPEN   256

/* We use the SunOS mmap() semantics. */
asmlinkage unsigned long sunos_mmap(unsigned long addr, unsigned long len,
                            unsigned long prot, unsigned long flags,
                            unsigned long fd, unsigned long off)
{
      struct file * file = NULL;
      unsigned long retval, ret_type;

      if (flags & MAP_NORESERVE) {
            static int cnt;
            if (cnt++ < 10)
                  printk("%s: unimplemented SunOS MAP_NORESERVE mmap() flag\n",
                         current->comm);
            flags &= ~MAP_NORESERVE;
      }
      retval = -EBADF;
      if (!(flags & MAP_ANONYMOUS)) {
            if (fd >= SUNOS_NR_OPEN)
                  goto out;
            file = fget(fd);
            if (!file)
                  goto out;
      }

      retval = -EINVAL;
      /* If this is ld.so or a shared library doing an mmap
       * of /dev/zero, transform it into an anonymous mapping.
       * SunOS is so stupid some times... hmph!
       */
      if (file) {
            if (imajor(file->f_path.dentry->d_inode) == MEM_MAJOR &&
                iminor(file->f_path.dentry->d_inode) == 5) {
                  flags |= MAP_ANONYMOUS;
                  fput(file);
                  file = NULL;
            }
      }
      ret_type = flags & _MAP_NEW;
      flags &= ~_MAP_NEW;

      if (!(flags & MAP_FIXED))
            addr = 0;
      else {
            if (ARCH_SUN4C_SUN4 &&
                (len > 0x20000000 ||
                 ((flags & MAP_FIXED) &&
                  addr < 0xe0000000 && addr + len > 0x20000000)))
                  goto out_putf;

            /* See asm-sparc/uaccess.h */
            if (len > TASK_SIZE - PAGE_SIZE ||
                addr + len > TASK_SIZE - PAGE_SIZE)
                  goto out_putf;
      }

      flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
      down_write(&current->mm->mmap_sem);
      retval = do_mmap(file, addr, len, prot, flags, off);
      up_write(&current->mm->mmap_sem);
      if (!ret_type)
            retval = ((retval < PAGE_OFFSET) ? 0 : retval);

out_putf:
      if (file)
            fput(file);
out:
      return retval;
}

/* lmbench calls this, just say "yeah, ok" */
asmlinkage int sunos_mctl(unsigned long addr, unsigned long len, int function, char *arg)
{
      return 0;
}

/* SunOS is completely broken... it returns 0 on success, otherwise
 * ENOMEM.  For sys_sbrk() it wants the old brk value as a return
 * on success and ENOMEM as before on failure.
 */
asmlinkage int sunos_brk(unsigned long brk)
{
      int freepages, retval = -ENOMEM;
      unsigned long rlim;
      unsigned long newbrk, oldbrk;

      down_write(&current->mm->mmap_sem);
      if (ARCH_SUN4C_SUN4) {
            if (brk >= 0x20000000 && brk < 0xe0000000) {
                  goto out;
            }
      }

      if (brk < current->mm->end_code)
            goto out;

      newbrk = PAGE_ALIGN(brk);
      oldbrk = PAGE_ALIGN(current->mm->brk);
      retval = 0;
      if (oldbrk == newbrk) {
            current->mm->brk = brk;
            goto out;
      }

      /*
       * Always allow shrinking brk
       */
      if (brk <= current->mm->brk) {
            current->mm->brk = brk;
            do_munmap(current->mm, newbrk, oldbrk-newbrk);
            goto out;
      }
      /*
       * Check against rlimit and stack..
       */
      retval = -ENOMEM;
      rlim = current->signal->rlim[RLIMIT_DATA].rlim_cur;
      if (rlim >= RLIM_INFINITY)
            rlim = ~0;
      if (brk - current->mm->end_code > rlim)
            goto out;

      /*
       * Check against existing mmap mappings.
       */
      if (find_vma_intersection(current->mm, oldbrk, newbrk+PAGE_SIZE))
            goto out;

      /*
       * stupid algorithm to decide if we have enough memory: while
       * simple, it hopefully works in most obvious cases.. Easy to
       * fool it, but this should catch most mistakes.
       */
      freepages = global_page_state(NR_FILE_PAGES);
      freepages >>= 1;
      freepages += nr_free_pages();
      freepages += nr_swap_pages;
      freepages -= num_physpages >> 4;
      freepages -= (newbrk-oldbrk) >> PAGE_SHIFT;
      if (freepages < 0)
            goto out;
      /*
       * Ok, we have probably got enough memory - let it rip.
       */
      current->mm->brk = brk;
      do_brk(oldbrk, newbrk-oldbrk);
      retval = 0;
out:
      up_write(&current->mm->mmap_sem);
      return retval;
}

asmlinkage unsigned long sunos_sbrk(int increment)
{
      int error;
      unsigned long oldbrk;

      /* This should do it hopefully... */
      lock_kernel();
      oldbrk = current->mm->brk;
      error = sunos_brk(((int) current->mm->brk) + increment);
      if (!error)
            error = oldbrk;
      unlock_kernel();
      return error;
}

/* XXX Completely undocumented, and completely magic...
 * XXX I believe it is to increase the size of the stack by
 * XXX argument 'increment' and return the new end of stack
 * XXX area.  Wheee...
 */
asmlinkage unsigned long sunos_sstk(int increment)
{
      lock_kernel();
      printk("%s: Call to sunos_sstk(increment<%d>) is unsupported\n",
             current->comm, increment);
      unlock_kernel();
      return -1;
}

/* Give hints to the kernel as to what paging strategy to use...
 * Completely bogus, don't remind me.
 */
#define VA_NORMAL     0 /* Normal vm usage expected */
#define VA_ABNORMAL   1 /* Abnormal/random vm usage probable */
#define VA_SEQUENTIAL 2 /* Accesses will be of a sequential nature */
#define VA_INVALIDATE 3 /* Page table entries should be flushed ??? */
static char *vstrings[] = {
      "VA_NORMAL",
      "VA_ABNORMAL",
      "VA_SEQUENTIAL",
      "VA_INVALIDATE",
};

asmlinkage void sunos_vadvise(unsigned long strategy)
{
      /* I wanna see who uses this... */
      lock_kernel();
      printk("%s: Advises us to use %s paging strategy\n",
             current->comm,
             strategy <= 3 ? vstrings[strategy] : "BOGUS");
      unlock_kernel();
}

/* This just wants the soft limit (ie. rlim_cur element) of the RLIMIT_NOFILE
 * resource limit and is for backwards compatibility with older sunos
 * revs.
 */
asmlinkage long sunos_getdtablesize(void)
{
      return SUNOS_NR_OPEN;
}

#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))

asmlinkage unsigned long sunos_sigblock(unsigned long blk_mask)
{
      unsigned long old;

      spin_lock_irq(&current->sighand->siglock);
      old = current->blocked.sig[0];
      current->blocked.sig[0] |= (blk_mask & _BLOCKABLE);
      recalc_sigpending();
      spin_unlock_irq(&current->sighand->siglock);
      return old;
}

asmlinkage unsigned long sunos_sigsetmask(unsigned long newmask)
{
      unsigned long retval;

      spin_lock_irq(&current->sighand->siglock);
      retval = current->blocked.sig[0];
      current->blocked.sig[0] = (newmask & _BLOCKABLE);
      recalc_sigpending();
      spin_unlock_irq(&current->sighand->siglock);
      return retval;
}

/* SunOS getdents is very similar to the newer Linux (iBCS2 compliant)    */
/* getdents system call, the format of the structure just has a different */
/* layout (d_off+d_ino instead of d_ino+d_off) */
struct sunos_dirent {
    long           d_off;
    unsigned long  d_ino;
    unsigned short d_reclen;
    unsigned short d_namlen;
    char           d_name[1];
};

struct sunos_dirent_callback {
    struct sunos_dirent __user *curr;
    struct sunos_dirent __user *previous;
    int count;
    int error;
};

#define NAME_OFFSET(de) ((int) ((de)->d_name - (char __user *) (de)))
#define ROUND_UP(x) (((x)+sizeof(long)-1) & ~(sizeof(long)-1))

static int sunos_filldir(void * __buf, const char * name, int namlen,
                   loff_t offset, u64 ino, unsigned int d_type)
{
      struct sunos_dirent __user *dirent;
      struct sunos_dirent_callback * buf = __buf;
      unsigned long d_ino;
      int reclen = ROUND_UP(NAME_OFFSET(dirent) + namlen + 1);

      buf->error = -EINVAL;   /* only used if we fail.. */
      if (reclen > buf->count)
            return -EINVAL;
      d_ino = ino;
      if (sizeof(d_ino) < sizeof(ino) && d_ino != ino)
            return -EOVERFLOW;
      dirent = buf->previous;
      if (dirent)
            put_user(offset, &dirent->d_off);
      dirent = buf->curr;
      buf->previous = dirent;
      put_user(d_ino, &dirent->d_ino);
      put_user(namlen, &dirent->d_namlen);
      put_user(reclen, &dirent->d_reclen);
      copy_to_user(dirent->d_name, name, namlen);
      put_user(0, dirent->d_name + namlen);
      dirent = (void __user *) dirent + reclen;
      buf->curr = dirent;
      buf->count -= reclen;
      return 0;
}

asmlinkage int sunos_getdents(unsigned int fd, void __user *dirent, int cnt)
{
      struct file * file;
      struct sunos_dirent __user *lastdirent;
      struct sunos_dirent_callback buf;
      int error = -EBADF;

      if (fd >= SUNOS_NR_OPEN)
            goto out;

      file = fget(fd);
      if (!file)
            goto out;

      error = -EINVAL;
      if (cnt < (sizeof(struct sunos_dirent) + 255))
            goto out_putf;

      buf.curr = (struct sunos_dirent __user *) dirent;
      buf.previous = NULL;
      buf.count = cnt;
      buf.error = 0;

      error = vfs_readdir(file, sunos_filldir, &buf);
      if (error < 0)
            goto out_putf;

      lastdirent = buf.previous;
      error = buf.error;
      if (lastdirent) {
            put_user(file->f_pos, &lastdirent->d_off);
            error = cnt - buf.count;
      }

out_putf:
      fput(file);
out:
      return error;
}

/* Old sunos getdirentries, severely broken compatibility stuff here. */
struct sunos_direntry {
    unsigned long  d_ino;
    unsigned short d_reclen;
    unsigned short d_namlen;
    char           d_name[1];
};

struct sunos_direntry_callback {
    struct sunos_direntry __user *curr;
    struct sunos_direntry __user *previous;
    int count;
    int error;
};

static int sunos_filldirentry(void * __buf, const char * name, int namlen,
                        loff_t offset, u64 ino, unsigned int d_type)
{
      struct sunos_direntry __user *dirent;
      struct sunos_direntry_callback *buf = __buf;
      unsigned long d_ino;
      int reclen = ROUND_UP(NAME_OFFSET(dirent) + namlen + 1);

      buf->error = -EINVAL;   /* only used if we fail.. */
      if (reclen > buf->count)
            return -EINVAL;
      d_ino = ino;
      if (sizeof(d_ino) < sizeof(ino) && d_ino != ino)
            return -EOVERFLOW;
      dirent = buf->previous;
      dirent = buf->curr;
      buf->previous = dirent;
      put_user(d_ino, &dirent->d_ino);
      put_user(namlen, &dirent->d_namlen);
      put_user(reclen, &dirent->d_reclen);
      copy_to_user(dirent->d_name, name, namlen);
      put_user(0, dirent->d_name + namlen);
      dirent = (void __user *) dirent + reclen;
      buf->curr = dirent;
      buf->count -= reclen;
      return 0;
}

asmlinkage int sunos_getdirentries(unsigned int fd, void __user *dirent,
                           int cnt, unsigned int __user *basep)
{
      struct file * file;
      struct sunos_direntry __user *lastdirent;
      struct sunos_direntry_callback buf;
      int error = -EBADF;

      if (fd >= SUNOS_NR_OPEN)
            goto out;

      file = fget(fd);
      if (!file)
            goto out;

      error = -EINVAL;
      if (cnt < (sizeof(struct sunos_direntry) + 255))
            goto out_putf;

      buf.curr = (struct sunos_direntry __user *) dirent;
      buf.previous = NULL;
      buf.count = cnt;
      buf.error = 0;

      error = vfs_readdir(file, sunos_filldirentry, &buf);
      if (error < 0)
            goto out_putf;

      lastdirent = buf.previous;
      error = buf.error;
      if (lastdirent) {
            put_user(file->f_pos, basep);
            error = cnt - buf.count;
      }

out_putf:
      fput(file);
out:
      return error;
}

struct sunos_utsname {
      char sname[9];
      char nname[9];
      char nnext[56];
      char rel[9];
      char ver[9];
      char mach[9];
};

asmlinkage int sunos_uname(struct sunos_utsname __user *name)
{
      int ret;
      down_read(&uts_sem);
      ret = copy_to_user(&name->sname[0], &utsname()->sysname[0],
                     sizeof(name->sname) - 1);
      if (!ret) {
            ret |= __copy_to_user(&name->nname[0], &utsname()->nodename[0],
                              sizeof(name->nname) - 1);
            ret |= __put_user('\0', &name->nname[8]);
            ret |= __copy_to_user(&name->rel[0], &utsname()->release[0],
                              sizeof(name->rel) - 1);
            ret |= __copy_to_user(&name->ver[0], &utsname()->version[0],
                              sizeof(name->ver) - 1);
            ret |= __copy_to_user(&name->mach[0], &utsname()->machine[0],
                              sizeof(name->mach) - 1);
      }
      up_read(&uts_sem);
      return ret ? -EFAULT : 0;
}

asmlinkage int sunos_nosys(void)
{
      struct pt_regs *regs;
      siginfo_t info;
      static int cnt;

      lock_kernel();
      regs = current->thread.kregs;
      info.si_signo = SIGSYS;
      info.si_errno = 0;
      info.si_code = __SI_FAULT|0x100;
      info.si_addr = (void __user *)regs->pc;
      info.si_trapno = regs->u_regs[UREG_G1];
      send_sig_info(SIGSYS, &info, current);
      if (cnt++ < 4) {
            printk("Process makes ni_syscall number %d, register dump:\n",
                   (int) regs->u_regs[UREG_G1]);
            show_regs(regs);
      }
      unlock_kernel();
      return -ENOSYS;
}

/* This is not a real and complete implementation yet, just to keep
 * the easy SunOS binaries happy.
 */
asmlinkage int sunos_fpathconf(int fd, int name)
{
      int ret;

      switch(name) {
      case _PCONF_LINK:
            ret = LINK_MAX;
            break;
      case _PCONF_CANON:
            ret = MAX_CANON;
            break;
      case _PCONF_INPUT:
            ret = MAX_INPUT;
            break;
      case _PCONF_NAME:
            ret = NAME_MAX;
            break;
      case _PCONF_PATH:
            ret = PATH_MAX;
            break;
      case _PCONF_PIPE:
            ret = PIPE_BUF;
            break;
      case _PCONF_CHRESTRICT:       /* XXX Investigate XXX */
            ret = 1;
            break;
      case _PCONF_NOTRUNC:          /* XXX Investigate XXX */
      case _PCONF_VDISABLE:
            ret = 0;
            break;
      default:
            ret = -EINVAL;
            break;
      }
      return ret;
}

asmlinkage int sunos_pathconf(char __user *path, int name)
{
      int ret;

      ret = sunos_fpathconf(0, name); /* XXX cheese XXX */
      return ret;
}

/* SunOS mount system call emulation */

asmlinkage int sunos_select(int width, fd_set __user *inp, fd_set __user *outp,
                      fd_set __user *exp, struct timeval __user *tvp)
{
      int ret;

      /* SunOS binaries expect that select won't change the tvp contents */
      ret = sys_select (width, inp, outp, exp, tvp);
      if (ret == -EINTR && tvp) {
            time_t sec, usec;

            __get_user(sec, &tvp->tv_sec);
            __get_user(usec, &tvp->tv_usec);

            if (sec == 0 && usec == 0)
                  ret = 0;
      }
      return ret;
}

asmlinkage void sunos_nop(void)
{
      return;
}

/* SunOS mount/umount. */
#define SMNT_RDONLY       1
#define SMNT_NOSUID       2
#define SMNT_NEWTYPE      4
#define SMNT_GRPID        8
#define SMNT_REMOUNT      16
#define SMNT_NOSUB        32
#define SMNT_MULTI        64
#define SMNT_SYS5         128

struct sunos_fh_t {
      char fh_data [NFS_FHSIZE];
};

struct sunos_nfs_mount_args {
      struct sockaddr_in  __user *addr; /* file server address */
      struct nfs_fh __user *fh;     /* File handle to be mounted */
      int        flags;      /* flags */
      int        wsize;      /* write size in bytes */
      int        rsize;      /* read size in bytes */
      int        timeo;      /* initial timeout in .1 secs */
      int        retrans;    /* times to retry send */
      char       __user *hostname;  /* server's hostname */
      int        acregmin;   /* attr cache file min secs */
      int        acregmax;   /* attr cache file max secs */
      int        acdirmin;   /* attr cache dir min secs */
      int        acdirmax;   /* attr cache dir max secs */
      char       __user *netname;   /* server's netname */
};


/* Bind the socket on a local reserved port and connect it to the
 * remote server.  This on Linux/i386 is done by the mount program,
 * not by the kernel.
 */
static int
sunos_nfs_get_server_fd (int fd, struct sockaddr_in *addr)
{
      struct sockaddr_in local;
      struct sockaddr_in server;
      int    try_port;
      struct socket *socket;
      struct inode  *inode;
      struct file   *file;
      int    ret, result = 0;

      file = fget(fd);
      if (!file)
            goto out;

      inode = file->f_path.dentry->d_inode;

      socket = SOCKET_I(inode);
      local.sin_family = AF_INET;
      local.sin_addr.s_addr = INADDR_ANY;

      /* IPPORT_RESERVED = 1024, can't find the definition in the kernel */
      try_port = 1024;
      do {
            local.sin_port = htons (--try_port);
            ret = socket->ops->bind(socket, (struct sockaddr*)&local,
                              sizeof(local));
      } while (ret && try_port > (1024 / 2));

      if (ret)
            goto out_putf;

      server.sin_family = AF_INET;
      server.sin_addr = addr->sin_addr;
      server.sin_port = NFS_PORT;

      /* Call sys_connect */
      ret = socket->ops->connect (socket, (struct sockaddr *) &server,
                            sizeof (server), file->f_flags);
      if (ret >= 0)
            result = 1;

out_putf:
      fput(file);
out:
      return result;
}

static int get_default (int value, int def_value)
{
    if (value)
      return value;
    else
      return def_value;
}

static int sunos_nfs_mount(char *dir_name, int linux_flags, void __user *data)
{
      int  server_fd, err;
      char *the_name, *mount_page;
      struct nfs_mount_data linux_nfs_mount;
      struct sunos_nfs_mount_args sunos_mount;

      /* Ok, here comes the fun part: Linux's nfs mount needs a
       * socket connection to the server, but SunOS mount does not
       * require this, so we use the information on the destination
       * address to create a socket and bind it to a reserved
       * port on this system
       */
      if (copy_from_user(&sunos_mount, data, sizeof(sunos_mount)))
            return -EFAULT;

      server_fd = sys_socket (AF_INET, SOCK_DGRAM, IPPROTO_UDP);
      if (server_fd < 0)
            return -ENXIO;

      if (copy_from_user(&linux_nfs_mount.addr,sunos_mount.addr,
                        sizeof(*sunos_mount.addr)) ||
          copy_from_user(&linux_nfs_mount.root,sunos_mount.fh,
                        sizeof(*sunos_mount.fh))) {
            sys_close (server_fd);
            return -EFAULT;
      }

      if (!sunos_nfs_get_server_fd (server_fd, &linux_nfs_mount.addr)){
            sys_close (server_fd);
            return -ENXIO;
      }

      /* Now, bind it to a locally reserved port */
      linux_nfs_mount.version  = NFS_MOUNT_VERSION;
      linux_nfs_mount.flags    = sunos_mount.flags;
      linux_nfs_mount.fd       = server_fd;
      
      linux_nfs_mount.rsize    = get_default (sunos_mount.rsize, 8192);
      linux_nfs_mount.wsize    = get_default (sunos_mount.wsize, 8192);
      linux_nfs_mount.timeo    = get_default (sunos_mount.timeo, 10);
      linux_nfs_mount.retrans  = sunos_mount.retrans;
      
      linux_nfs_mount.acregmin = sunos_mount.acregmin;
      linux_nfs_mount.acregmax = sunos_mount.acregmax;
      linux_nfs_mount.acdirmin = sunos_mount.acdirmin;
      linux_nfs_mount.acdirmax = sunos_mount.acdirmax;

      the_name = getname(sunos_mount.hostname);
      if (IS_ERR(the_name))
            return PTR_ERR(the_name);

      strlcpy(linux_nfs_mount.hostname, the_name,
            sizeof(linux_nfs_mount.hostname));
      putname (the_name);
      
      mount_page = (char *) get_zeroed_page(GFP_KERNEL);
      if (!mount_page)
            return -ENOMEM;

      memcpy(mount_page, &linux_nfs_mount, sizeof(linux_nfs_mount));

      err = do_mount("", dir_name, "nfs", linux_flags, mount_page);

      free_page((unsigned long) mount_page);
      return err;
}

asmlinkage int
sunos_mount(char __user *type, char __user *dir, int flags, void __user *data)
{
      int linux_flags = 0;
      int ret = -EINVAL;
      char *dev_fname = NULL;
      char *dir_page, *type_page;

      if (!capable (CAP_SYS_ADMIN))
            return -EPERM;
            
      lock_kernel();
      /* We don't handle the integer fs type */
      if ((flags & SMNT_NEWTYPE) == 0)
            goto out;

      /* Do not allow for those flags we don't support */
      if (flags & (SMNT_GRPID|SMNT_NOSUB|SMNT_MULTI|SMNT_SYS5))
            goto out;

      if (flags & SMNT_REMOUNT)
            linux_flags |= MS_REMOUNT;
      if (flags & SMNT_RDONLY)
            linux_flags |= MS_RDONLY;
      if (flags & SMNT_NOSUID)
            linux_flags |= MS_NOSUID;

      dir_page = getname(dir);
      ret = PTR_ERR(dir_page);
      if (IS_ERR(dir_page))
            goto out;

      type_page = getname(type);
      ret = PTR_ERR(type_page);
      if (IS_ERR(type_page))
            goto out1;

      if (strcmp(type_page, "ext2") == 0) {
            dev_fname = getname(data);
      } else if (strcmp(type_page, "iso9660") == 0) {
            dev_fname = getname(data);
      } else if (strcmp(type_page, "minix") == 0) {
            dev_fname = getname(data);
      } else if (strcmp(type_page, "nfs") == 0) {
            ret = sunos_nfs_mount (dir_page, flags, data);
            goto out2;
        } else if (strcmp(type_page, "ufs") == 0) {
            printk("Warning: UFS filesystem mounts unsupported.\n");
            ret = -ENODEV;
            goto out2;
      } else if (strcmp(type_page, "proc")) {
            ret = -ENODEV;
            goto out2;
      }
      ret = PTR_ERR(dev_fname);
      if (IS_ERR(dev_fname))
            goto out2;
      ret = do_mount(dev_fname, dir_page, type_page, linux_flags, NULL);
      if (dev_fname)
            putname(dev_fname);
out2:
      putname(type_page);
out1:
      putname(dir_page);
out:
      unlock_kernel();
      return ret;
}


asmlinkage int sunos_setpgrp(pid_t pid, pid_t pgid)
{
      int ret;

      /* So stupid... */
      if ((!pid || pid == current->pid) &&
          !pgid) {
            sys_setsid();
            ret = 0;
      } else {
            ret = sys_setpgid(pid, pgid);
      }
      return ret;
}

/* So stupid... */
asmlinkage int sunos_wait4(pid_t pid, unsigned int __user *stat_addr,
                     int options, struct rusage __user*ru)
{
      int ret;

      ret = sys_wait4((pid ? pid : -1), stat_addr, options, ru);
      return ret;
}

asmlinkage int sunos_killpg(int pgrp, int sig)
{
      int ret;

      rcu_read_lock();
      ret = -EINVAL;
      if (pgrp > 0)
            ret = kill_pgrp(find_vpid(pgrp), sig, 0);
      rcu_read_unlock();

      return ret;
}

asmlinkage int sunos_audit(void)
{
      lock_kernel();
      printk ("sys_audit\n");
      unlock_kernel();
      return -1;
}

asmlinkage unsigned long sunos_gethostid(void)
{
      unsigned long ret;

      lock_kernel();
      ret = ((unsigned long)idprom->id_machtype << 24) |
            (unsigned long)idprom->id_sernum;
      unlock_kernel();
      return ret;
}

/* sysconf options, for SunOS compatibility */
#define   _SC_ARG_MAX             1
#define   _SC_CHILD_MAX           2
#define   _SC_CLK_TCK             3
#define   _SC_NGROUPS_MAX         4
#define   _SC_OPEN_MAX            5
#define   _SC_JOB_CONTROL         6
#define   _SC_SAVED_IDS           7
#define   _SC_VERSION             8

asmlinkage long sunos_sysconf (int name)
{
      long ret;

      switch (name){
      case _SC_ARG_MAX:
            ret = ARG_MAX;
            break;
      case _SC_CHILD_MAX:
            ret = current->signal->rlim[RLIMIT_NPROC].rlim_cur;
            break;
      case _SC_CLK_TCK:
            ret = HZ;
            break;
      case _SC_NGROUPS_MAX:
            ret = NGROUPS_MAX;
            break;
      case _SC_OPEN_MAX:
            ret = current->signal->rlim[RLIMIT_NOFILE].rlim_cur;
            break;
      case _SC_JOB_CONTROL:
            ret = 1;    /* yes, we do support job control */
            break;
      case _SC_SAVED_IDS:
            ret = 1;    /* yes, we do support saved uids  */
            break;
      case _SC_VERSION:
            /* mhm, POSIX_VERSION is in /usr/include/unistd.h
             * should it go on /usr/include/linux?
             */
            ret = 199009L; 
            break;
      default:
            ret = -1;
            break;
      };
      return ret;
}

asmlinkage int sunos_semsys(int op, unsigned long arg1, unsigned long arg2,
                      unsigned long arg3, void *ptr)
{
      union semun arg4;
      int ret;

      switch (op) {
      case 0:
            /* Most arguments match on a 1:1 basis but cmd doesn't */
            switch(arg3) {
            case 4:
                  arg3=GETPID; break;
            case 5:
                  arg3=GETVAL; break;
            case 6:
                  arg3=GETALL; break;
            case 3:
                  arg3=GETNCNT; break;
            case 7:
                  arg3=GETZCNT; break;
            case 8:
                  arg3=SETVAL; break;
            case 9:
                  arg3=SETALL; break;
            }
            /* sys_semctl(): */
            /* value to modify semaphore to */
            arg4.__pad = (void __user *) ptr;
            ret = sys_semctl((int)arg1, (int)arg2, (int)arg3, arg4 );
            break;
      case 1:
            /* sys_semget(): */
            ret = sys_semget((key_t)arg1, (int)arg2, (int)arg3);
            break;
      case 2:
            /* sys_semop(): */
            ret = sys_semop((int)arg1, (struct sembuf __user *)arg2, (unsigned)arg3);
            break;
      default:
            ret = -EINVAL;
            break;
      };
      return ret;
}

asmlinkage int sunos_msgsys(int op, unsigned long arg1, unsigned long arg2,
                      unsigned long arg3, unsigned long arg4)
{
      struct sparc_stackf *sp;
      unsigned long arg5;
      int rval;

      switch(op) {
      case 0:
            rval = sys_msgget((key_t)arg1, (int)arg2);
            break;
      case 1:
            rval = sys_msgctl((int)arg1, (int)arg2,
                          (struct msqid_ds __user *)arg3);
            break;
      case 2:
            lock_kernel();
            sp = (struct sparc_stackf *)current->thread.kregs->u_regs[UREG_FP];
            arg5 = sp->xxargs[0];
            unlock_kernel();
            rval = sys_msgrcv((int)arg1, (struct msgbuf __user *)arg2,
                          (size_t)arg3, (long)arg4, (int)arg5);
            break;
      case 3:
            rval = sys_msgsnd((int)arg1, (struct msgbuf __user *)arg2,
                          (size_t)arg3, (int)arg4);
            break;
      default:
            rval = -EINVAL;
            break;
      }
      return rval;
}

asmlinkage int sunos_shmsys(int op, unsigned long arg1, unsigned long arg2,
                      unsigned long arg3)
{
      unsigned long raddr;
      int rval;

      switch(op) {
      case 0:
            /* do_shmat(): attach a shared memory area */
            rval = do_shmat((int)arg1,(char __user *)arg2,(int)arg3,&raddr);
            if (!rval)
                  rval = (int) raddr;
            break;
      case 1:
            /* sys_shmctl(): modify shared memory area attr. */
            rval = sys_shmctl((int)arg1,(int)arg2,(struct shmid_ds __user *)arg3);
            break;
      case 2:
            /* sys_shmdt(): detach a shared memory area */
            rval = sys_shmdt((char __user *)arg1);
            break;
      case 3:
            /* sys_shmget(): get a shared memory area */
            rval = sys_shmget((key_t)arg1,(int)arg2,(int)arg3);
            break;
      default:
            rval = -EINVAL;
            break;
      };
      return rval;
}

#define SUNOS_EWOULDBLOCK 35

/* see the sunos man page read(2v) for an explanation
   of this garbage. We use O_NDELAY to mark
   file descriptors that have been set non-blocking 
   using 4.2BSD style calls. (tridge) */

static inline int check_nonblock(int ret, int fd)
{
      if (ret == -EAGAIN) {
            struct file * file = fget(fd);
            if (file) {
                  if (file->f_flags & O_NDELAY)
                        ret = -SUNOS_EWOULDBLOCK;
                  fput(file);
            }
      }
      return ret;
}

asmlinkage int sunos_read(unsigned int fd, char __user *buf, int count)
{
      int ret;

      ret = check_nonblock(sys_read(fd,buf,count),fd);
      return ret;
}

asmlinkage int sunos_readv(unsigned long fd, const struct iovec __user *vector,
                     long count)
{
      int ret;

      ret = check_nonblock(sys_readv(fd,vector,count),fd);
      return ret;
}

asmlinkage int sunos_write(unsigned int fd, char __user *buf, int count)
{
      int ret;

      ret = check_nonblock(sys_write(fd,buf,count),fd);
      return ret;
}

asmlinkage int sunos_writev(unsigned long fd,
                      const struct iovec __user *vector, long count)
{
      int ret;

      ret = check_nonblock(sys_writev(fd,vector,count),fd);
      return ret;
}

asmlinkage int sunos_recv(int fd, void __user *ubuf, int size, unsigned flags)
{
      int ret;

      ret = check_nonblock(sys_recv(fd,ubuf,size,flags),fd);
      return ret;
}

asmlinkage int sunos_send(int fd, void __user *buff, int len, unsigned flags)
{
      int ret;

      ret = check_nonblock(sys_send(fd,buff,len,flags),fd);
      return ret;
}

asmlinkage int sunos_accept(int fd, struct sockaddr __user *sa,
                      int __user *addrlen)
{
      int ret;

      while (1) {
            ret = check_nonblock(sys_accept(fd,sa,addrlen),fd);   
            if (ret != -ENETUNREACH && ret != -EHOSTUNREACH)
                  break;
      }

      return ret;
}

#define SUNOS_SV_INTERRUPT 2

asmlinkage int
sunos_sigaction(int sig, const struct old_sigaction __user *act,
            struct old_sigaction __user *oact)
{
      struct k_sigaction new_ka, old_ka;
      int ret;

      if (act) {
            old_sigset_t mask;

            if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
                __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
                __get_user(new_ka.sa.sa_flags, &act->sa_flags))
                  return -EFAULT;
            __get_user(mask, &act->sa_mask);
            new_ka.sa.sa_restorer = NULL;
            new_ka.ka_restorer = NULL;
            siginitset(&new_ka.sa.sa_mask, mask);
            new_ka.sa.sa_flags ^= SUNOS_SV_INTERRUPT;
      }

      ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);

      if (!ret && oact) {
            /* In the clone() case we could copy half consistent
             * state to the user, however this could sleep and
             * deadlock us if we held the signal lock on SMP.  So for
             * now I take the easy way out and do no locking.
             * But then again we don't support SunOS lwp's anyways ;-)
             */
            old_ka.sa.sa_flags ^= SUNOS_SV_INTERRUPT;
            if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
                __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
                __put_user(old_ka.sa.sa_flags, &oact->sa_flags))
                   return -EFAULT;
            __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
      }

      return ret;
}


asmlinkage int sunos_setsockopt(int fd, int level, int optname,
                        char __user *optval, int optlen)
{
      int tr_opt = optname;
      int ret;

      if (level == SOL_IP) {
            /* Multicast socketopts (ttl, membership) */
            if (tr_opt >=2 && tr_opt <= 6)
                  tr_opt += 30;
      }
      ret = sys_setsockopt(fd, level, tr_opt, optval, optlen);
      return ret;
}

asmlinkage int sunos_getsockopt(int fd, int level, int optname,
                        char __user *optval, int __user *optlen)
{
      int tr_opt = optname;
      int ret;

      if (level == SOL_IP) {
            /* Multicast socketopts (ttl, membership) */
            if (tr_opt >=2 && tr_opt <= 6)
                  tr_opt += 30;
      }
      ret = sys_getsockopt(fd, level, tr_opt, optval, optlen);
      return ret;
}

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