dl-sysdep.c

Glibc 2.3.2源代码(解压后有100多M)

      err = __io_stat (*port, stat);
      if (err)
	__mach_port_deallocate (__mach_task_self (), *port);
    }

  return err;
}

int weak_function
__open (const char *file_name, int mode, ...)
{
  mach_port_t port;
  error_t err = open_file (file_name, mode, &port, 0);
  if (err)
    return __hurd_fail (err);
  else
    return (int)port;
}

int weak_function
__close (int fd)
{
  if (fd != (int) MACH_PORT_NULL)
    __mach_port_deallocate (__mach_task_self (), (mach_port_t) fd);
  return 0;
}

__ssize_t weak_function
__libc_read (int fd, void *buf, size_t nbytes)
{
  error_t err;
  char *data;
  mach_msg_type_number_t nread;

  data = buf;
  err = __io_read ((mach_port_t) fd, &data, &nread, -1, nbytes);
  if (err)
    return __hurd_fail (err);

  if (data != buf)
    {
      memcpy (buf, data, nread);
      __vm_deallocate (__mach_task_self (), (vm_address_t) data, nread);
    }

  return nread;
}
libc_hidden_weak (__libc_read)

__ssize_t weak_function
__libc_write (int fd, const void *buf, size_t nbytes)
{
  error_t err;
  mach_msg_type_number_t nwrote;

  assert (fd < _hurd_init_dtablesize);

  err = __io_write (_hurd_init_dtable[fd], buf, nbytes, -1, &nwrote);
  if (err)
    return __hurd_fail (err);

  return nwrote;
}
libc_hidden_weak (__libc_write)

/* This is only used for printing messages (see dl-misc.c).  */
__ssize_t weak_function
__writev (int fd, const struct iovec *iov, int niov)
{
  int i;
  size_t total = 0;
  for (i = 0; i < niov; ++i)
    total += iov[i].iov_len;

  assert (fd < _hurd_init_dtablesize);

  if (total != 0)
    {
      char buf[total], *bufp = buf;
      error_t err;
      mach_msg_type_number_t nwrote;

      for (i = 0; i < niov; ++i)
	bufp = (memcpy (bufp, iov[i].iov_base, iov[i].iov_len)
		+ iov[i].iov_len);

      err = __io_write (_hurd_init_dtable[fd], buf, total, -1, &nwrote);
      if (err)
	return __hurd_fail (err);

      return nwrote;
    }
  return 0;
}


off64_t weak_function
__libc_lseek64 (int fd, off64_t offset, int whence)
{
  error_t err;

  err = __io_seek ((mach_port_t) fd, offset, whence, &offset);
  if (err)
    return __hurd_fail (err);

  return offset;
}

__ptr_t weak_function
__mmap (__ptr_t addr, size_t len, int prot, int flags, int fd, off_t offset)
{
  error_t err;
  vm_prot_t vmprot;
  vm_address_t mapaddr;
  mach_port_t memobj_rd, memobj_wr;

  vmprot = VM_PROT_NONE;
  if (prot & PROT_READ)
    vmprot |= VM_PROT_READ;
  if (prot & PROT_WRITE)
    vmprot |= VM_PROT_WRITE;
  if (prot & PROT_EXEC)
    vmprot |= VM_PROT_EXECUTE;

  if (flags & MAP_ANON)
    memobj_rd = MACH_PORT_NULL;
  else
    {
      assert (!(flags & MAP_SHARED));
      err = __io_map ((mach_port_t) fd, &memobj_rd, &memobj_wr);
      if (err)
	return __hurd_fail (err), MAP_FAILED;
      __mach_port_deallocate (__mach_task_self (), memobj_wr);
    }

  mapaddr = (vm_address_t) addr;
  err = __vm_map (__mach_task_self (),
		  &mapaddr, (vm_size_t) len, ELF_MACHINE_USER_ADDRESS_MASK,
		  !(flags & MAP_FIXED),
		  memobj_rd,
		  (vm_offset_t) offset,
		  flags & (MAP_COPY|MAP_PRIVATE),
		  vmprot, VM_PROT_ALL,
		  (flags & MAP_SHARED) ? VM_INHERIT_SHARE : VM_INHERIT_COPY);
  if (err == KERN_NO_SPACE && (flags & MAP_FIXED))
    {
      /* XXX this is not atomic as it is in unix! */
      /* The region is already allocated; deallocate it first.  */
      err = __vm_deallocate (__mach_task_self (), mapaddr, len);
      if (! err)
	err = __vm_map (__mach_task_self (),
			&mapaddr, (vm_size_t) len,
			ELF_MACHINE_USER_ADDRESS_MASK,
			!(flags & MAP_FIXED),
			memobj_rd, (vm_offset_t) offset,
			flags & (MAP_COPY|MAP_PRIVATE),
			vmprot, VM_PROT_ALL,
			(flags & MAP_SHARED)
			? VM_INHERIT_SHARE : VM_INHERIT_COPY);
    }

  if ((flags & MAP_ANON) == 0)
    __mach_port_deallocate (__mach_task_self (), memobj_rd);

  if (err)
    return __hurd_fail (err), MAP_FAILED;
  return (__ptr_t) mapaddr;
}

int weak_function
__fxstat64 (int vers, int fd, struct stat64 *buf)
{
  error_t err;

  assert (vers == _STAT_VER);

  err = __io_stat ((mach_port_t) fd, buf);
  if (err)
    return __hurd_fail (err);

  return 0;
}
libc_hidden_def (__fxstat64)

int weak_function
__xstat64 (int vers, const char *file, struct stat64 *buf)
{
  error_t err;
  mach_port_t port;

  assert (vers == _STAT_VER);

  err = open_file (file, 0, &port, buf);
  if (err)
    return __hurd_fail (err);

  __mach_port_deallocate (__mach_task_self (), port);

  return 0;
}
libc_hidden_def (__xstat64)

/* This function is called by the dynamic linker (rtld.c) to check
   whether debugging malloc is allowed even for SUID binaries.  This
   stub will always fail, which means that malloc-debugging is always
   disabled for SUID binaries.  */
int weak_function
__access (const char *file, int type)
{
  errno = ENOSYS;
  return -1;
}

pid_t weak_function
__getpid ()
{
  pid_t pid, ppid;
  int orphaned;

  if (__proc_getpids (_dl_hurd_data->portarray[INIT_PORT_PROC],
		      &pid, &ppid, &orphaned))
    return -1;

  return pid;
}

/* This is called only in some strange cases trying to guess a value
   for $ORIGIN for the executable.  The dynamic linker copes with
   getcwd failing (dl-object.c), and it's too much hassle to include
   the functionality here.  (We could, it just requires duplicating or
   reusing getcwd.c's code but using our special lookup function as in
   `open', above.)  */
char *
weak_function
__getcwd (char *buf, size_t size)
{
  errno = ENOSYS;
  return NULL;
}

void weak_function
_exit (int status)
{
  __proc_mark_exit (_dl_hurd_data->portarray[INIT_PORT_PROC],
		    W_EXITCODE (status, 0), 0);
  while (__task_terminate (__mach_task_self ()))
    __mach_task_self_ = (__mach_task_self) ();
}
/* We need this alias to satisfy references from libc_pic.a objects
   that were affected by the libc_hidden_proto declaration for _exit.  */
strong_alias (_exit, __GI__exit)

/* Try to get a machine dependent instruction which will make the
   program crash.  This is used in case everything else fails.  */
#include <abort-instr.h>
#ifndef ABORT_INSTRUCTION
/* No such instruction is available.  */
# define ABORT_INSTRUCTION
#endif

void weak_function
abort (void)
{
  /* Try to abort using the system specific command.  */
  ABORT_INSTRUCTION;

  /* If the abort instruction failed, exit.  */
  _exit (127);

  /* If even this fails, make sure we never return.  */
  while (1)
    /* Try for ever and ever.  */
    ABORT_INSTRUCTION;
}

/* We need this alias to satisfy references from libc_pic.a objects
   that were affected by the libc_hidden_proto declaration for abort.  */
strong_alias (abort, __GI_abort)

/* This function is called by interruptible RPC stubs.  For initial
   dynamic linking, just use the normal mach_msg.  Since this defn is
   weak, the real defn in libc.so will override it if we are linked into
   the user program (-ldl).  */

error_t weak_function
_hurd_intr_rpc_mach_msg (mach_msg_header_t *msg,
			 mach_msg_option_t option,
			 mach_msg_size_t send_size,
			 mach_msg_size_t rcv_size,
			 mach_port_t rcv_name,
			 mach_msg_timeout_t timeout,
			 mach_port_t notify)
{
  return __mach_msg (msg, option, send_size, rcv_size, rcv_name,
		     timeout, notify);
}


void
internal_function
_dl_show_auxv (void)
{
  /* There is nothing to print.  Hurd has no auxiliary vector.  */
}


/* Return an array of useful/necessary hardware capability names.  */
const struct r_strlenpair *
internal_function
_dl_important_hwcaps (const char *platform, size_t platform_len, size_t *sz,
		      size_t *max_capstrlen)
{
  struct r_strlenpair *result;

  /* Return an empty array.  Hurd has no hardware capabilities.  */
  result = (struct r_strlenpair *) malloc (sizeof (*result));
  if (result == NULL)
    INTUSE (_dl_signal_error) (ENOMEM, NULL, NULL,
			       "cannot create capability list");

  result[0].str = (char *) result;	/* Does not really matter.  */
  result[0].len = 0;

  *sz = 1;
  return result;
}

void weak_function
_dl_init_first (int argc, ...)
{
  /* This no-op definition only gets used if libc is not linked in.  */
}