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glibc  2.9
Defines | Functions | Variables
fileops.c File Reference
#include "libioP.h"
#include <assert.h>
#include <fcntl.h>
#include <sys/param.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>

Go to the source code of this file.

Defines

#define _POSIX_SOURCE
#define _IO_new_do_write   _IO_do_write
#define _IO_new_file_attach   _IO_file_attach
#define _IO_new_file_close_it   _IO_file_close_it
#define _IO_new_file_finish   _IO_file_finish
#define _IO_new_file_fopen   _IO_file_fopen
#define _IO_new_file_init   _IO_file_init
#define _IO_new_file_setbuf   _IO_file_setbuf
#define _IO_new_file_sync   _IO_file_sync
#define _IO_new_file_overflow   _IO_file_overflow
#define _IO_new_file_seekoff   _IO_file_seekoff
#define _IO_new_file_underflow   _IO_file_underflow
#define _IO_new_file_write   _IO_file_write
#define _IO_new_file_xsputn   _IO_file_xsputn
#define CLOSED_FILEBUF_FLAGS   (_IO_IS_FILEBUF+_IO_NO_READS+_IO_NO_WRITES+_IO_TIED_PUT_GET)
#define ROUNDED(x)   (((x) + pagesize - 1) & ~(pagesize - 1))

Functions

void _IO_new_file_init (struct _IO_FILE_plus *fp)
int _IO_new_file_close_it (_IO_FILE *fp)
void _IO_new_file_finish (_IO_FILE *fp, int dummy)
_IO_FILE_IO_file_open (_IO_FILE *fp, const char *filename, int posix_mode, int prot, int read_write, int is32not64)
 libc_hidden_def (_IO_file_open)
_IO_FILE_IO_new_file_attach (_IO_FILE *fp, int fd)
_IO_FILE_IO_new_file_setbuf (_IO_FILE *fp, char *p, _IO_ssize_t len)
_IO_FILE_IO_file_setbuf_mmap (_IO_FILE *fp, char *p, _IO_ssize_t len)
static _IO_size_t new_do_write (_IO_FILE *, const char *, _IO_size_t)
int _IO_new_do_write (_IO_FILE *fp, const char *data, _IO_size_t to_do)
int _IO_new_file_underflow (_IO_FILE *fp)
static int mmap_remap_check (_IO_FILE *fp)
int _IO_file_underflow_mmap (_IO_FILE *fp)
static void decide_maybe_mmap (_IO_FILE *fp)
int _IO_file_underflow_maybe_mmap (_IO_FILE *fp)
int _IO_new_file_overflow (_IO_FILE *f, int ch)
int _IO_new_file_sync (_IO_FILE *fp)
static int _IO_file_sync_mmap (_IO_FILE *fp)
_IO_off64_t _IO_new_file_seekoff (_IO_FILE *fp, _IO_off64_t offset, int dir, int mode)
_IO_off64_t _IO_file_seekoff_mmap (_IO_FILE *fp, _IO_off64_t offset, int dir, int mode)
static _IO_off64_t _IO_file_seekoff_maybe_mmap (_IO_FILE *fp, _IO_off64_t offset, int dir, int mode)
_IO_ssize_t _IO_file_read (_IO_FILE *fp, void *buf, _IO_ssize_t size)
_IO_off64_t _IO_file_seek (_IO_FILE *fp, _IO_off64_t offset, int dir)
int _IO_file_stat (_IO_FILE *fp, void *st)
int _IO_file_close_mmap (_IO_FILE *fp)
int _IO_file_close (_IO_FILE *fp)
_IO_ssize_t _IO_new_file_write (_IO_FILE *f, const void *data, _IO_ssize_t n)
_IO_size_t _IO_new_file_xsputn (_IO_FILE *f, const void *data, _IO_size_t n)
_IO_size_t _IO_file_xsgetn (_IO_FILE *fp, void *data, _IO_size_t n)
static _IO_size_t _IO_file_xsgetn_mmap (_IO_FILE *, void *, _IO_size_t)
static _IO_size_t _IO_file_xsgetn_maybe_mmap (_IO_FILE *, void *, _IO_size_t)
 libc_hidden_data_def (_IO_file_jumps) const

Variables

int errno

Define Documentation

Definition at line 69 of file fileops.c.

Definition at line 70 of file fileops.c.

Definition at line 71 of file fileops.c.

Definition at line 72 of file fileops.c.

#define _IO_new_file_fopen   _IO_file_fopen

Definition at line 73 of file fileops.c.

Definition at line 74 of file fileops.c.

Definition at line 77 of file fileops.c.

Definition at line 78 of file fileops.c.

Definition at line 75 of file fileops.c.

Definition at line 76 of file fileops.c.

Definition at line 79 of file fileops.c.

Definition at line 80 of file fileops.c.

Definition at line 81 of file fileops.c.

#define _POSIX_SOURCE

Definition at line 32 of file fileops.c.

Definition at line 140 of file fileops.c.

#define ROUNDED (   x)    (((x) + pagesize - 1) & ~(pagesize - 1))

Function Documentation

Definition at line 1247 of file fileops.c.

{
  /* Cancelling close should be avoided if possible since it leaves an
     unrecoverable state behind.  */
  return close_not_cancel (fp->_fileno);
}

Definition at line 1235 of file fileops.c.

{
  /* In addition to closing the file descriptor we have to unmap the file.  */
  (void) __munmap (fp->_IO_buf_base, fp->_IO_buf_end - fp->_IO_buf_base);
  fp->_IO_buf_base = fp->_IO_buf_end = NULL;
  /* Cancelling close should be avoided if possible since it leaves an
     unrecoverable state behind.  */
  return close_not_cancel (fp->_fileno);
}

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_IO_FILE* _IO_file_open ( _IO_FILE fp,
const char *  filename,
int  posix_mode,
int  prot,
int  read_write,
int  is32not64 
)

Definition at line 217 of file fileops.c.

{
  int fdesc;
#ifdef _LIBC
  if (__builtin_expect (fp->_flags2 & _IO_FLAGS2_NOTCANCEL, 0))
    fdesc = open_not_cancel (filename,
                          posix_mode | (is32not64 ? 0 : O_LARGEFILE), prot);
  else
    fdesc = open (filename, posix_mode | (is32not64 ? 0 : O_LARGEFILE), prot);
#else
  fdesc = open (filename, posix_mode, prot);
#endif
  if (fdesc < 0)
    return NULL;
  fp->_fileno = fdesc;
  _IO_mask_flags (fp, read_write,_IO_NO_READS+_IO_NO_WRITES+_IO_IS_APPENDING);
  if ((read_write & _IO_IS_APPENDING) && (read_write & _IO_NO_READS))
    if (_IO_SEEKOFF (fp, (_IO_off64_t)0, _IO_seek_end, _IOS_INPUT|_IOS_OUTPUT)
       == _IO_pos_BAD && errno != ESPIPE)
      {
       close_not_cancel (fdesc);
       return NULL;
      }
  INTUSE(_IO_link_in) ((struct _IO_FILE_plus *) fp);
  return fp;
}

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_IO_ssize_t _IO_file_read ( _IO_FILE fp,
void *  buf,
_IO_ssize_t  size 
)

Definition at line 1196 of file fileops.c.

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_IO_off64_t _IO_file_seek ( _IO_FILE fp,
_IO_off64_t  offset,
int  dir 
)

Definition at line 1208 of file fileops.c.

{
#ifdef _G_LSEEK64
  return _G_LSEEK64 (fp->_fileno, offset, dir);
#else
  return lseek (fp->_fileno, offset, dir);
#endif
}

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static _IO_off64_t _IO_file_seekoff_maybe_mmap ( _IO_FILE fp,
_IO_off64_t  offset,
int  dir,
int  mode 
) [static]

Definition at line 1180 of file fileops.c.

{
  /* We only get here when we haven't tried to read anything yet.
     So there is nothing more useful for us to do here than just
     the underlying lseek call.  */

  _IO_off64_t result = _IO_SYSSEEK (fp, offset, dir);
  if (result < 0)
    return EOF;

  fp->_offset = result;
  return result;
}
_IO_off64_t _IO_file_seekoff_mmap ( _IO_FILE fp,
_IO_off64_t  offset,
int  dir,
int  mode 
)

Definition at line 1121 of file fileops.c.

{
  _IO_off64_t result;

  /* If we are only interested in the current position, calculate it and
     return right now.  This calculation does the right thing when we are
     using a pushback buffer, but in the usual case has the same value as
     (fp->_IO_read_ptr - fp->_IO_buf_base).  */
  if (mode == 0)
    return fp->_offset - (fp->_IO_read_end - fp->_IO_read_ptr);

  switch (dir)
    {
    case _IO_seek_cur:
      /* Adjust for read-ahead (bytes is buffer). */
      offset += fp->_IO_read_ptr - fp->_IO_read_base;
      break;
    case _IO_seek_set:
      break;
    case _IO_seek_end:
      offset += fp->_IO_buf_end - fp->_IO_buf_base;
      break;
    }
  /* At this point, dir==_IO_seek_set. */

  if (offset < 0)
    {
      /* No negative offsets are valid.  */
      __set_errno (EINVAL);
      return EOF;
    }

  result = _IO_SYSSEEK (fp, offset, 0);
  if (result < 0)
    return EOF;

  if (offset > fp->_IO_buf_end - fp->_IO_buf_base)
    /* One can fseek arbitrarily past the end of the file
       and it is meaningless until one attempts to read.
       Leave the buffer pointers in EOF state until underflow.  */
    _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_end, fp->_IO_buf_end);
  else
    /* Adjust the read pointers to match the file position,
       but so the next read attempt will call underflow.  */
    _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base + offset,
             fp->_IO_buf_base + offset);

  fp->_offset = result;

  _IO_mask_flags (fp, 0, _IO_EOF_SEEN);

  return offset;
}

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_IO_FILE* _IO_file_setbuf_mmap ( _IO_FILE fp,
char *  p,
_IO_ssize_t  len 
)

Definition at line 459 of file fileops.c.

{
  _IO_FILE *result;

  /* Change the function table.  */
  _IO_JUMPS ((struct _IO_FILE_plus *) fp) = &_IO_file_jumps;
  fp->_wide_data->_wide_vtable = &_IO_wfile_jumps;

  /* And perform the normal operation.  */
  result = _IO_new_file_setbuf (fp, p, len);

  /* If the call failed, restore to using mmap.  */
  if (result == NULL)
    {
      _IO_JUMPS ((struct _IO_FILE_plus *) fp) = &_IO_file_jumps_mmap;
      fp->_wide_data->_wide_vtable = &_IO_wfile_jumps_mmap;
    }

  return result;
}

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int _IO_file_stat ( _IO_FILE fp,
void *  st 
)

Definition at line 1222 of file fileops.c.

{
#ifdef _G_FSTAT64
  return _G_FSTAT64 (fp->_fileno, (struct _G_stat64 *) st);
#else
  return fstat (fp->_fileno, (struct stat *) st);
#endif
}

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static int _IO_file_sync_mmap ( _IO_FILE fp) [static]

Definition at line 924 of file fileops.c.

{
  if (fp->_IO_read_ptr != fp->_IO_read_end)
    {
#ifdef TODO
      if (_IO_in_backup (fp))
       delta -= eGptr () - Gbase ();
#endif
      if (
# ifdef _G_LSEEK64
         _G_LSEEK64
# else
         __lseek
# endif
         (fp->_fileno, fp->_IO_read_ptr - fp->_IO_buf_base, SEEK_SET)
         != fp->_IO_read_ptr - fp->_IO_buf_base)
       {
         fp->_flags |= _IO_ERR_SEEN;
         return EOF;
       }
    }
  fp->_offset = fp->_IO_read_ptr - fp->_IO_buf_base;
  fp->_IO_read_end = fp->_IO_read_ptr = fp->_IO_read_base;
  return 0;
}

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Definition at line 816 of file fileops.c.

{
  /* This is the first read attempt.  Choose mmap or vanilla operations
     and then punt to the chosen underflow routine.  */
  decide_maybe_mmap (fp);
  return _IO_UNDERFLOW (fp);
}

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Definition at line 727 of file fileops.c.

{
  if (fp->_IO_read_ptr < fp->_IO_read_end)
    return *(unsigned char *) fp->_IO_read_ptr;

  if (__builtin_expect (mmap_remap_check (fp), 0))
    /* We punted to the regular file functions.  */
    return _IO_UNDERFLOW (fp);

  if (fp->_IO_read_ptr < fp->_IO_read_end)
    return *(unsigned char *) fp->_IO_read_ptr;

  fp->_flags |= _IO_EOF_SEEN;
  return EOF;
}

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_IO_size_t _IO_file_xsgetn ( _IO_FILE fp,
void *  data,
_IO_size_t  n 
)

Definition at line 1379 of file fileops.c.

{
  register _IO_size_t want, have;
  register _IO_ssize_t count;
  register char *s = data;

  want = n;

  if (fp->_IO_buf_base == NULL)
    {
      /* Maybe we already have a push back pointer.  */
      if (fp->_IO_save_base != NULL)
       {
         free (fp->_IO_save_base);
         fp->_flags &= ~_IO_IN_BACKUP;
       }
      INTUSE(_IO_doallocbuf) (fp);
    }

  while (want > 0)
    {
      have = fp->_IO_read_end - fp->_IO_read_ptr;
      if (want <= have)
       {
         memcpy (s, fp->_IO_read_ptr, want);
         fp->_IO_read_ptr += want;
         want = 0;
       }
      else
       {
         if (have > 0)
           {
#ifdef _LIBC
             s = __mempcpy (s, fp->_IO_read_ptr, have);
#else
             memcpy (s, fp->_IO_read_ptr, have);
             s += have;
#endif
             want -= have;
             fp->_IO_read_ptr += have;
           }

         /* Check for backup and repeat */
         if (_IO_in_backup (fp))
           {
             _IO_switch_to_main_get_area (fp);
             continue;
           }

         /* If we now want less than a buffer, underflow and repeat
            the copy.  Otherwise, _IO_SYSREAD directly to
            the user buffer. */
         if (fp->_IO_buf_base
             && want < (size_t) (fp->_IO_buf_end - fp->_IO_buf_base))
           {
             if (__underflow (fp) == EOF)
              break;

             continue;
           }

         /* These must be set before the sysread as we might longjmp out
            waiting for input. */
         _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base, fp->_IO_buf_base);
         _IO_setp (fp, fp->_IO_buf_base, fp->_IO_buf_base);

         /* Try to maintain alignment: read a whole number of blocks.  */
         count = want;
         if (fp->_IO_buf_base)
           {
             _IO_size_t block_size = fp->_IO_buf_end - fp->_IO_buf_base;
             if (block_size >= 128)
              count -= want % block_size;
           }

         count = _IO_SYSREAD (fp, s, count);
         if (count <= 0)
           {
             if (count == 0)
              fp->_flags |= _IO_EOF_SEEN;
             else
              fp->_flags |= _IO_ERR_SEEN;

             break;
           }

         s += count;
         want -= count;
         if (fp->_offset != _IO_pos_BAD)
           _IO_pos_adjust (fp->_offset, count);
       }
    }

  return n - want;
}

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static _IO_size_t _IO_file_xsgetn_maybe_mmap ( _IO_FILE fp,
void *  data,
_IO_size_t  n 
) [static]

Definition at line 1540 of file fileops.c.

{
  /* We only get here if this is the first attempt to read something.
     Decide which operations to use and then punt to the chosen one.  */

  decide_maybe_mmap (fp);
  return _IO_XSGETN (fp, data, n);
}

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static _IO_size_t _IO_file_xsgetn_mmap ( _IO_FILE fp,
void *  data,
_IO_size_t  n 
) [static]

Definition at line 1481 of file fileops.c.

{
  register _IO_size_t have;
  char *read_ptr = fp->_IO_read_ptr;
  register char *s = (char *) data;

  have = fp->_IO_read_end - fp->_IO_read_ptr;

  if (have < n)
    {
      if (__builtin_expect (_IO_in_backup (fp), 0))
       {
#ifdef _LIBC
         s = __mempcpy (s, read_ptr, have);
#else
         memcpy (s, read_ptr, have);
         s += have;
#endif
         n -= have;
         _IO_switch_to_main_get_area (fp);
         read_ptr = fp->_IO_read_ptr;
         have = fp->_IO_read_end - fp->_IO_read_ptr;
       }

      if (have < n)
       {
         /* Check that we are mapping all of the file, in case it grew.  */
         if (__builtin_expect (mmap_remap_check (fp), 0))
           /* We punted mmap, so complete with the vanilla code.  */
           return s - (char *) data + _IO_XSGETN (fp, data, n);

         read_ptr = fp->_IO_read_ptr;
         have = fp->_IO_read_end - read_ptr;
       }
    }

  if (have < n)
    fp->_flags |= _IO_EOF_SEEN;

  if (have != 0)
    {
      have = MIN (have, n);
#ifdef _LIBC
      s = __mempcpy (s, read_ptr, have);
#else
      memcpy (s, read_ptr, have);
      s += have;
#endif
      fp->_IO_read_ptr = read_ptr + have;
    }

  return s - (char *) data;
}

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int _IO_new_do_write ( _IO_FILE fp,
const char *  data,
_IO_size_t  to_do 
)

Definition at line 489 of file fileops.c.

{
  return (to_do == 0
         || (_IO_size_t) new_do_write (fp, data, to_do) == to_do) ? 0 : EOF;
}

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Definition at line 419 of file fileops.c.

{
  if (_IO_file_is_open (fp))
    return NULL;
  fp->_fileno = fd;
  fp->_flags &= ~(_IO_NO_READS+_IO_NO_WRITES);
  fp->_flags |= _IO_DELETE_DONT_CLOSE;
  /* Get the current position of the file. */
  /* We have to do that since that may be junk. */
  fp->_offset = _IO_pos_BAD;
  int save_errno = errno;
  if (_IO_SEEKOFF (fp, (_IO_off64_t)0, _IO_seek_cur, _IOS_INPUT|_IOS_OUTPUT)
      == _IO_pos_BAD && errno != ESPIPE)
    return NULL;
  __set_errno (save_errno);
  return fp;
}

Definition at line 160 of file fileops.c.

{
  int write_status, close_status;
  if (!_IO_file_is_open (fp))
    return EOF;

  if ((fp->_flags & _IO_NO_WRITES) == 0
      && (fp->_flags & _IO_CURRENTLY_PUTTING) != 0)
    write_status = _IO_do_flush (fp);
  else
    write_status = 0;

  INTUSE(_IO_unsave_markers) (fp);

  close_status = _IO_SYSCLOSE (fp);

  /* Free buffer. */
#if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
  if (fp->_mode > 0)
    {
      if (_IO_have_wbackup (fp))
       INTUSE(_IO_free_wbackup_area) (fp);
      INTUSE(_IO_wsetb) (fp, NULL, NULL, 0);
      _IO_wsetg (fp, NULL, NULL, NULL);
      _IO_wsetp (fp, NULL, NULL);
    }
#endif
  INTUSE(_IO_setb) (fp, NULL, NULL, 0);
  _IO_setg (fp, NULL, NULL, NULL);
  _IO_setp (fp, NULL, NULL);

  INTUSE(_IO_un_link) ((struct _IO_FILE_plus *) fp);
  fp->_flags = _IO_MAGIC|CLOSED_FILEBUF_FLAGS;
  fp->_fileno = -1;
  fp->_offset = _IO_pos_BAD;

  return close_status ? close_status : write_status;
}

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void _IO_new_file_finish ( _IO_FILE fp,
int  dummy 
)

Definition at line 202 of file fileops.c.

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void _IO_new_file_init ( struct _IO_FILE_plus fp)

Definition at line 145 of file fileops.c.

{
  /* POSIX.1 allows another file handle to be used to change the position
     of our file descriptor.  Hence we actually don't know the actual
     position before we do the first fseek (and until a following fflush). */
  fp->file._offset = _IO_pos_BAD;
  fp->file._IO_file_flags |= CLOSED_FILEBUF_FLAGS;

  INTUSE(_IO_link_in) (fp);
  fp->file._fileno = -1;
}

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Definition at line 826 of file fileops.c.

{
  if (f->_flags & _IO_NO_WRITES) /* SET ERROR */
    {
      f->_flags |= _IO_ERR_SEEN;
      __set_errno (EBADF);
      return EOF;
    }
  /* If currently reading or no buffer allocated. */
  if ((f->_flags & _IO_CURRENTLY_PUTTING) == 0 || f->_IO_write_base == NULL)
    {
      /* Allocate a buffer if needed. */
      if (f->_IO_write_base == NULL)
       {
         INTUSE(_IO_doallocbuf) (f);
         _IO_setg (f, f->_IO_buf_base, f->_IO_buf_base, f->_IO_buf_base);
       }
      /* Otherwise must be currently reading.
        If _IO_read_ptr (and hence also _IO_read_end) is at the buffer end,
        logically slide the buffer forwards one block (by setting the
        read pointers to all point at the beginning of the block).  This
        makes room for subsequent output.
        Otherwise, set the read pointers to _IO_read_end (leaving that
        alone, so it can continue to correspond to the external position). */
      if (__builtin_expect (_IO_in_backup (f), 0))
       {
         size_t nbackup = f->_IO_read_end - f->_IO_read_ptr;
         INTUSE(_IO_free_backup_area) (f);
         f->_IO_read_base -= MIN (nbackup,
                               f->_IO_read_base - f->_IO_buf_base);
         f->_IO_read_ptr = f->_IO_read_base;
       }

      if (f->_IO_read_ptr == f->_IO_buf_end)
       f->_IO_read_end = f->_IO_read_ptr = f->_IO_buf_base;
      f->_IO_write_ptr = f->_IO_read_ptr;
      f->_IO_write_base = f->_IO_write_ptr;
      f->_IO_write_end = f->_IO_buf_end;
      f->_IO_read_base = f->_IO_read_ptr = f->_IO_read_end;

      f->_flags |= _IO_CURRENTLY_PUTTING;
      if (f->_mode <= 0 && f->_flags & (_IO_LINE_BUF+_IO_UNBUFFERED))
       f->_IO_write_end = f->_IO_write_ptr;
    }
  if (ch == EOF)
    return INTUSE(_IO_do_write) (f, f->_IO_write_base,
                             f->_IO_write_ptr - f->_IO_write_base);
  if (f->_IO_write_ptr == f->_IO_buf_end ) /* Buffer is really full */
    if (_IO_do_flush (f) == EOF)
      return EOF;
  *f->_IO_write_ptr++ = ch;
  if ((f->_flags & _IO_UNBUFFERED)
      || ((f->_flags & _IO_LINE_BUF) && ch == '\n'))
    if (INTUSE(_IO_do_write) (f, f->_IO_write_base,
                           f->_IO_write_ptr - f->_IO_write_base) == EOF)
      return EOF;
  return (unsigned char) ch;
}

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_IO_off64_t _IO_new_file_seekoff ( _IO_FILE fp,
_IO_off64_t  offset,
int  dir,
int  mode 
)

Definition at line 952 of file fileops.c.

{
  _IO_off64_t result;
  _IO_off64_t delta, new_offset;
  long count;
  /* POSIX.1 8.2.3.7 says that after a call the fflush() the file
     offset of the underlying file must be exact.  */
  int must_be_exact = (fp->_IO_read_base == fp->_IO_read_end
                     && fp->_IO_write_base == fp->_IO_write_ptr);

  if (mode == 0)
    dir = _IO_seek_cur, offset = 0; /* Don't move any pointers. */

  /* Flush unwritten characters.
     (This may do an unneeded write if we seek within the buffer.
     But to be able to switch to reading, we would need to set
     egptr to ptr.  That can't be done in the current design,
     which assumes file_ptr() is eGptr.  Anyway, since we probably
     end up flushing when we close(), it doesn't make much difference.)
     FIXME: simulate mem-papped files. */

  if (fp->_IO_write_ptr > fp->_IO_write_base || _IO_in_put_mode (fp))
    if (INTUSE(_IO_switch_to_get_mode) (fp))
      return EOF;

  if (fp->_IO_buf_base == NULL)
    {
      /* It could be that we already have a pushback buffer.  */
      if (fp->_IO_read_base != NULL)
       {
         free (fp->_IO_read_base);
         fp->_flags &= ~_IO_IN_BACKUP;
       }
      INTUSE(_IO_doallocbuf) (fp);
      _IO_setp (fp, fp->_IO_buf_base, fp->_IO_buf_base);
      _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base, fp->_IO_buf_base);
    }

  switch (dir)
    {
    case _IO_seek_cur:
      /* Adjust for read-ahead (bytes is buffer). */
      offset -= fp->_IO_read_end - fp->_IO_read_ptr;
      if (fp->_offset == _IO_pos_BAD)
        {
          if (mode != 0)
            goto dumb;
          else
            {
              result = _IO_SYSSEEK (fp, 0, dir);
              if (result == EOF)
                return result;

              fp->_offset = result;
            }
        }
      /* Make offset absolute, assuming current pointer is file_ptr(). */
      offset += fp->_offset;
      if (offset < 0)
       {
         __set_errno (EINVAL);
         return EOF;
       }

      dir = _IO_seek_set;
      break;
    case _IO_seek_set:
      break;
    case _IO_seek_end:
      {
       struct _G_stat64 st;
       if (_IO_SYSSTAT (fp, &st) == 0 && S_ISREG (st.st_mode))
         {
           offset += st.st_size;
           dir = _IO_seek_set;
         }
       else
         goto dumb;
      }
    }
  /* At this point, dir==_IO_seek_set. */

  /* If we are only interested in the current position we've found it now.  */
  if (mode == 0)
    return offset;

  /* If destination is within current buffer, optimize: */
  if (fp->_offset != _IO_pos_BAD && fp->_IO_read_base != NULL
      && !_IO_in_backup (fp))
    {
      _IO_off64_t start_offset = (fp->_offset
                              - (fp->_IO_read_end - fp->_IO_buf_base));
      if (offset >= start_offset && offset < fp->_offset)
       {
         _IO_setg (fp, fp->_IO_buf_base,
                  fp->_IO_buf_base + (offset - start_offset),
                  fp->_IO_read_end);
         _IO_setp (fp, fp->_IO_buf_base, fp->_IO_buf_base);

         _IO_mask_flags (fp, 0, _IO_EOF_SEEN);
         goto resync;
       }
    }

  if (fp->_flags & _IO_NO_READS)
    goto dumb;

  /* Try to seek to a block boundary, to improve kernel page management. */
  new_offset = offset & ~(fp->_IO_buf_end - fp->_IO_buf_base - 1);
  delta = offset - new_offset;
  if (delta > fp->_IO_buf_end - fp->_IO_buf_base)
    {
      new_offset = offset;
      delta = 0;
    }
  result = _IO_SYSSEEK (fp, new_offset, 0);
  if (result < 0)
    return EOF;
  if (delta == 0)
    count = 0;
  else
    {
      count = _IO_SYSREAD (fp, fp->_IO_buf_base,
                        (must_be_exact
                         ? delta : fp->_IO_buf_end - fp->_IO_buf_base));
      if (count < delta)
       {
         /* We weren't allowed to read, but try to seek the remainder. */
         offset = count == EOF ? delta : delta-count;
         dir = _IO_seek_cur;
         goto dumb;
       }
    }
  _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base + delta,
           fp->_IO_buf_base + count);
  _IO_setp (fp, fp->_IO_buf_base, fp->_IO_buf_base);
  fp->_offset = result + count;
  _IO_mask_flags (fp, 0, _IO_EOF_SEEN);
  return offset;
 dumb:

  INTUSE(_IO_unsave_markers) (fp);
  result = _IO_SYSSEEK (fp, offset, dir);
  if (result != EOF)
    {
      _IO_mask_flags (fp, 0, _IO_EOF_SEEN);
      fp->_offset = result;
      _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base, fp->_IO_buf_base);
      _IO_setp (fp, fp->_IO_buf_base, fp->_IO_buf_base);
    }
  return result;

resync:
  /* We need to do it since it is possible that the file offset in
     the kernel may be changed behind our back. It may happen when
     we fopen a file and then do a fork. One process may access the
     the file and the kernel file offset will be changed. */
  if (fp->_offset >= 0)
    _IO_SYSSEEK (fp, fp->_offset, 0);

  return offset;
}

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_IO_FILE* _IO_new_file_setbuf ( _IO_FILE fp,
char *  p,
_IO_ssize_t  len 
)

Definition at line 441 of file fileops.c.

{
  if (_IO_default_setbuf (fp, p, len) == NULL)
    return NULL;

  fp->_IO_write_base = fp->_IO_write_ptr = fp->_IO_write_end
    = fp->_IO_buf_base;
  _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base, fp->_IO_buf_base);

  return fp;
}

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Definition at line 889 of file fileops.c.

{
  _IO_ssize_t delta;
  int retval = 0;

  /*    char* ptr = cur_ptr(); */
  if (fp->_IO_write_ptr > fp->_IO_write_base)
    if (_IO_do_flush(fp)) return EOF;
  delta = fp->_IO_read_ptr - fp->_IO_read_end;
  if (delta != 0)
    {
#ifdef TODO
      if (_IO_in_backup (fp))
       delta -= eGptr () - Gbase ();
#endif
      _IO_off64_t new_pos = _IO_SYSSEEK (fp, delta, 1);
      if (new_pos != (_IO_off64_t) EOF)
       fp->_IO_read_end = fp->_IO_read_ptr;
#ifdef ESPIPE
      else if (errno == ESPIPE)
       ; /* Ignore error from unseekable devices. */
#endif
      else
       retval = EOF;
    }
  if (retval != EOF)
    fp->_offset = _IO_pos_BAD;
  /* FIXME: Cleanup - can this be shared? */
  /*    setg(base(), ptr, ptr); */
  return retval;
}

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Definition at line 535 of file fileops.c.

{
  _IO_ssize_t count;
#if 0
  /* SysV does not make this test; take it out for compatibility */
  if (fp->_flags & _IO_EOF_SEEN)
    return (EOF);
#endif

  if (fp->_flags & _IO_NO_READS)
    {
      fp->_flags |= _IO_ERR_SEEN;
      __set_errno (EBADF);
      return EOF;
    }
  if (fp->_IO_read_ptr < fp->_IO_read_end)
    return *(unsigned char *) fp->_IO_read_ptr;

  if (fp->_IO_buf_base == NULL)
    {
      /* Maybe we already have a push back pointer.  */
      if (fp->_IO_save_base != NULL)
       {
         free (fp->_IO_save_base);
         fp->_flags &= ~_IO_IN_BACKUP;
       }
      INTUSE(_IO_doallocbuf) (fp);
    }

  /* Flush all line buffered files before reading. */
  /* FIXME This can/should be moved to genops ?? */
  if (fp->_flags & (_IO_LINE_BUF|_IO_UNBUFFERED))
    {
#if 0
      INTUSE(_IO_flush_all_linebuffered) ();
#else
      /* We used to flush all line-buffered stream.  This really isn't
        required by any standard.  My recollection is that
        traditional Unix systems did this for stdout.  stderr better
        not be line buffered.  So we do just that here
        explicitly.  --drepper */
      _IO_acquire_lock (_IO_stdout);

      if ((_IO_stdout->_flags & (_IO_LINKED | _IO_NO_WRITES | _IO_LINE_BUF))
         == (_IO_LINKED | _IO_LINE_BUF))
       _IO_OVERFLOW (_IO_stdout, EOF);

      _IO_release_lock (_IO_stdout);
#endif
    }

  INTUSE(_IO_switch_to_get_mode) (fp);

  /* This is very tricky. We have to adjust those
     pointers before we call _IO_SYSREAD () since
     we may longjump () out while waiting for
     input. Those pointers may be screwed up. H.J. */
  fp->_IO_read_base = fp->_IO_read_ptr = fp->_IO_buf_base;
  fp->_IO_read_end = fp->_IO_buf_base;
  fp->_IO_write_base = fp->_IO_write_ptr = fp->_IO_write_end
    = fp->_IO_buf_base;

  count = _IO_SYSREAD (fp, fp->_IO_buf_base,
                     fp->_IO_buf_end - fp->_IO_buf_base);
  if (count <= 0)
    {
      if (count == 0)
       fp->_flags |= _IO_EOF_SEEN;
      else
       fp->_flags |= _IO_ERR_SEEN, count = 0;
  }
  fp->_IO_read_end += count;
  if (count == 0)
    return EOF;
  if (fp->_offset != _IO_pos_BAD)
    _IO_pos_adjust (fp->_offset, count);
  return *(unsigned char *) fp->_IO_read_ptr;
}

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_IO_ssize_t _IO_new_file_write ( _IO_FILE f,
const void *  data,
_IO_ssize_t  n 
)

Definition at line 1257 of file fileops.c.

{
  _IO_ssize_t to_do = n;
  while (to_do > 0)
    {
      _IO_ssize_t count = (__builtin_expect (f->_flags2
                                        & _IO_FLAGS2_NOTCANCEL, 0)
                        ? write_not_cancel (f->_fileno, data, to_do)
                        : write (f->_fileno, data, to_do));
      if (count < 0)
       {
         f->_flags |= _IO_ERR_SEEN;
         break;
        }
      to_do -= count;
      data = (void *) ((char *) data + count);
    }
  n -= to_do;
  if (f->_offset >= 0)
    f->_offset += n;
  return n;
}

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_IO_size_t _IO_new_file_xsputn ( _IO_FILE f,
const void *  data,
_IO_size_t  n 
)

Definition at line 1284 of file fileops.c.

{
  register const char *s = (const char *) data;
  _IO_size_t to_do = n;
  int must_flush = 0;
  _IO_size_t count = 0;

  if (n <= 0)
    return 0;
  /* This is an optimized implementation.
     If the amount to be written straddles a block boundary
     (or the filebuf is unbuffered), use sys_write directly. */

  /* First figure out how much space is available in the buffer. */
  if ((f->_flags & _IO_LINE_BUF) && (f->_flags & _IO_CURRENTLY_PUTTING))
    {
      count = f->_IO_buf_end - f->_IO_write_ptr;
      if (count >= n)
       {
         register const char *p;
         for (p = s + n; p > s; )
           {
             if (*--p == '\n')
              {
                count = p - s + 1;
                must_flush = 1;
                break;
              }
           }
       }
    }
  else if (f->_IO_write_end > f->_IO_write_ptr)
    count = f->_IO_write_end - f->_IO_write_ptr; /* Space available. */

  /* Then fill the buffer. */
  if (count > 0)
    {
      if (count > to_do)
       count = to_do;
      if (count > 20)
       {
#ifdef _LIBC
         f->_IO_write_ptr = __mempcpy (f->_IO_write_ptr, s, count);
#else
         memcpy (f->_IO_write_ptr, s, count);
         f->_IO_write_ptr += count;
#endif
         s += count;
       }
      else
       {
         register char *p = f->_IO_write_ptr;
         register int i = (int) count;
         while (--i >= 0)
           *p++ = *s++;
         f->_IO_write_ptr = p;
       }
      to_do -= count;
    }
  if (to_do + must_flush > 0)
    {
      _IO_size_t block_size, do_write;
      /* Next flush the (full) buffer. */
      if (_IO_OVERFLOW (f, EOF) == EOF)
       /* If nothing else has to be written we must not signal the
          caller that everything has been written.  */
       return to_do == 0 ? EOF : n - to_do;

      /* Try to maintain alignment: write a whole number of blocks.
        dont_write is what gets left over. */
      block_size = f->_IO_buf_end - f->_IO_buf_base;
      do_write = to_do - (block_size >= 128 ? to_do % block_size : 0);

      if (do_write)
        {
         count = new_do_write (f, s, do_write);
         to_do -= count;
         if (count < do_write)
           return n - to_do;
        }

      /* Now write out the remainder.  Normally, this will fit in the
        buffer, but it's somewhat messier for line-buffered files,
        so we let _IO_default_xsputn handle the general case. */
      if (to_do)
       to_do -= INTUSE(_IO_default_xsputn) (f, s+do_write, to_do);
    }
  return n - to_do;
}

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static void decide_maybe_mmap ( _IO_FILE fp) [static]

Definition at line 744 of file fileops.c.

{
  /* We use the file in read-only mode.  This could mean we can
     mmap the file and use it without any copying.  But not all
     file descriptors are for mmap-able objects and on 32-bit
     machines we don't want to map files which are too large since
     this would require too much virtual memory.  */
  struct _G_stat64 st;

  if (_IO_SYSSTAT (fp, &st) == 0
      && S_ISREG (st.st_mode) && st.st_size != 0
      /* Limit the file size to 1MB for 32-bit machines.  */
      && (sizeof (ptrdiff_t) > 4 || st.st_size < 1*1024*1024)
      /* Sanity check.  */
      && (fp->_offset == _IO_pos_BAD || fp->_offset <= st.st_size))
    {
      /* Try to map the file.  */
      void *p;

# ifdef _G_MMAP64
      p = _G_MMAP64 (NULL, st.st_size, PROT_READ, MAP_SHARED, fp->_fileno, 0);
# else
      p = __mmap (NULL, st.st_size, PROT_READ, MAP_SHARED, fp->_fileno, 0);
# endif
      if (p != MAP_FAILED)
       {
         /* OK, we managed to map the file.  Set the buffer up and use a
            special jump table with simplified underflow functions which
            never tries to read anything from the file.  */

         if (
# ifdef _G_LSEEK64
             _G_LSEEK64
# else
             __lseek
# endif
             (fp->_fileno, st.st_size, SEEK_SET) != st.st_size)
           {
             (void) __munmap (p, st.st_size);
             fp->_offset = _IO_pos_BAD;
           }
         else
           {
             INTUSE(_IO_setb) (fp, p, (char *) p + st.st_size, 0);

             if (fp->_offset == _IO_pos_BAD)
              fp->_offset = 0;

             _IO_setg (fp, p, p + fp->_offset, p + st.st_size);
             fp->_offset = st.st_size;

             if (fp->_mode <= 0)
              _IO_JUMPS ((struct _IO_FILE_plus *)fp) = &_IO_file_jumps_mmap;
             else
              _IO_JUMPS ((struct _IO_FILE_plus *)fp) = &_IO_wfile_jumps_mmap;
             fp->_wide_data->_wide_vtable = &_IO_wfile_jumps_mmap;

             return;
           }
       }
    }

  /* We couldn't use mmap, so revert to the vanilla file operations.  */

  if (fp->_mode <= 0)
    _IO_JUMPS ((struct _IO_FILE_plus *) fp) = &_IO_file_jumps;
  else
    _IO_JUMPS ((struct _IO_FILE_plus *) fp) = &_IO_wfile_jumps;
  fp->_wide_data->_wide_vtable = &_IO_wfile_jumps;
}

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libc_hidden_data_def ( _IO_file_jumps  ) const

Definition at line 249 of file fileops.c.

{
  int oflags = 0, omode;
  int read_write;
  int oprot = 0666;
  int i;
  _IO_FILE *result;
#ifdef _LIBC
  const char *cs;
  const char *last_recognized;
#endif

  if (_IO_file_is_open (fp))
    return 0;
  switch (*mode)
    {
    case 'r':
      omode = O_RDONLY;
      read_write = _IO_NO_WRITES;
      break;
    case 'w':
      omode = O_WRONLY;
      oflags = O_CREAT|O_TRUNC;
      read_write = _IO_NO_READS;
      break;
    case 'a':
      omode = O_WRONLY;
      oflags = O_CREAT|O_APPEND;
      read_write = _IO_NO_READS|_IO_IS_APPENDING;
      break;
    default:
      __set_errno (EINVAL);
      return NULL;
    }
#ifdef _LIBC
  last_recognized = mode;
#endif
  for (i = 1; i < 6; ++i)
    {
      switch (*++mode)
       {
       case '\0':
         break;
       case '+':
         omode = O_RDWR;
         read_write &= _IO_IS_APPENDING;
#ifdef _LIBC
         last_recognized = mode;
#endif
         continue;
       case 'x':
         oflags |= O_EXCL;
#ifdef _LIBC
         last_recognized = mode;
#endif
         continue;
       case 'b':
#ifdef _LIBC
         last_recognized = mode;
#endif
         continue;
       case 'm':
         fp->_flags2 |= _IO_FLAGS2_MMAP;
         continue;
       case 'c':
         fp->_flags2 |= _IO_FLAGS2_NOTCANCEL;
         break;
#ifdef O_CLOEXEC
       case 'e':
         oflags |= O_CLOEXEC;
         break;
#endif
       default:
         /* Ignore.  */
         continue;
       }
      break;
    }

  result = _IO_file_open (fp, filename, omode|oflags, oprot, read_write,
                       is32not64);


#ifdef _LIBC
  if (result != NULL)
    {
      /* Test whether the mode string specifies the conversion.  */
      cs = strstr (last_recognized + 1, ",ccs=");
      if (cs != NULL)
       {
         /* Yep.  Load the appropriate conversions and set the orientation
            to wide.  */
         struct gconv_fcts fcts;
         struct _IO_codecvt *cc;
         char *endp = __strchrnul (cs + 5, ',');
         char ccs[endp - (cs + 5) + 3];

         *((char *) __mempcpy (ccs, cs + 5, endp - (cs + 5))) = '\0';
         strip (ccs, ccs);

         if (__wcsmbs_named_conv (&fcts, ccs[2] == '\0'
                               ? upstr (ccs, cs + 5) : ccs) != 0)
           {
             /* Something went wrong, we cannot load the conversion modules.
               This means we cannot proceed since the user explicitly asked
               for these.  */
             (void) INTUSE(_IO_file_close_it) (fp);
             __set_errno (EINVAL);
             return NULL;
           }

         assert (fcts.towc_nsteps == 1);
         assert (fcts.tomb_nsteps == 1);

         fp->_wide_data->_IO_read_ptr = fp->_wide_data->_IO_read_end;
         fp->_wide_data->_IO_write_ptr = fp->_wide_data->_IO_write_base;

         /* Clear the state.  We start all over again.  */
         memset (&fp->_wide_data->_IO_state, '\0', sizeof (__mbstate_t));
         memset (&fp->_wide_data->_IO_last_state, '\0', sizeof (__mbstate_t));

         cc = fp->_codecvt = &fp->_wide_data->_codecvt;

         /* The functions are always the same.  */
         *cc = __libio_codecvt;

         cc->__cd_in.__cd.__nsteps = fcts.towc_nsteps;
         cc->__cd_in.__cd.__steps = fcts.towc;

         cc->__cd_in.__cd.__data[0].__invocation_counter = 0;
         cc->__cd_in.__cd.__data[0].__internal_use = 1;
         cc->__cd_in.__cd.__data[0].__flags = __GCONV_IS_LAST;
         cc->__cd_in.__cd.__data[0].__statep = &result->_wide_data->_IO_state;

         /* XXX For now no transliteration.  */
         cc->__cd_in.__cd.__data[0].__trans = NULL;

         cc->__cd_out.__cd.__nsteps = fcts.tomb_nsteps;
         cc->__cd_out.__cd.__steps = fcts.tomb;

         cc->__cd_out.__cd.__data[0].__invocation_counter = 0;
         cc->__cd_out.__cd.__data[0].__internal_use = 1;
         cc->__cd_out.__cd.__data[0].__flags = __GCONV_IS_LAST;
         cc->__cd_out.__cd.__data[0].__statep =
           &result->_wide_data->_IO_state;

         /* And now the transliteration.  */
         cc->__cd_out.__cd.__data[0].__trans = &__libio_translit;

         /* From now on use the wide character callback functions.  */
         ((struct _IO_FILE_plus *) fp)->vtable = fp->_wide_data->_wide_vtable;

         /* Set the mode now.  */
         result->_mode = 1;
       }
    }
#endif /* GNU libc */

  return result;
}

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static int mmap_remap_check ( _IO_FILE fp) [static]

Definition at line 621 of file fileops.c.

{
  struct _G_stat64 st;

  if (_IO_SYSSTAT (fp, &st) == 0
      && S_ISREG (st.st_mode) && st.st_size != 0
      /* Limit the file size to 1MB for 32-bit machines.  */
      && (sizeof (ptrdiff_t) > 4 || st.st_size < 1*1024*1024))
    {
      const size_t pagesize = __getpagesize ();
# define ROUNDED(x)  (((x) + pagesize - 1) & ~(pagesize - 1))
      if (ROUNDED (st.st_size) < ROUNDED (fp->_IO_buf_end
                                     - fp->_IO_buf_base))
       {
         /* We can trim off some pages past the end of the file.  */
         (void) __munmap (fp->_IO_buf_base + ROUNDED (st.st_size),
                        ROUNDED (fp->_IO_buf_end - fp->_IO_buf_base)
                        - ROUNDED (st.st_size));
         fp->_IO_buf_end = fp->_IO_buf_base + st.st_size;
       }
      else if (ROUNDED (st.st_size) > ROUNDED (fp->_IO_buf_end
                                          - fp->_IO_buf_base))
       {
         /* The file added some pages.  We need to remap it.  */
         void *p;
#ifdef _G_HAVE_MREMAP
         p = __mremap (fp->_IO_buf_base, ROUNDED (fp->_IO_buf_end
                                             - fp->_IO_buf_base),
                     ROUNDED (st.st_size), MREMAP_MAYMOVE);
         if (p == MAP_FAILED)
           {
             (void) __munmap (fp->_IO_buf_base,
                            fp->_IO_buf_end - fp->_IO_buf_base);
             goto punt;
           }
#else
         (void) __munmap (fp->_IO_buf_base,
                        fp->_IO_buf_end - fp->_IO_buf_base);
# ifdef _G_MMAP64
         p = _G_MMAP64 (NULL, st.st_size, PROT_READ, MAP_SHARED,
                      fp->_fileno, 0);
# else
         p = __mmap (NULL, st.st_size, PROT_READ, MAP_SHARED,
                    fp->_fileno, 0);
# endif
         if (p == MAP_FAILED)
           goto punt;
#endif
         fp->_IO_buf_base = p;
         fp->_IO_buf_end = fp->_IO_buf_base + st.st_size;
       }
      else
       {
         /* The number of pages didn't change.  */
         fp->_IO_buf_end = fp->_IO_buf_base + st.st_size;
       }
# undef ROUNDED

      fp->_offset -= fp->_IO_read_end - fp->_IO_read_ptr;
      _IO_setg (fp, fp->_IO_buf_base,
              fp->_offset < fp->_IO_buf_end - fp->_IO_buf_base
              ? fp->_IO_buf_base + fp->_offset : fp->_IO_buf_end,
              fp->_IO_buf_end);

      /* If we are already positioned at or past the end of the file, don't
        change the current offset.  If not, seek past what we have mapped,
        mimicking the position left by a normal underflow reading into its
        buffer until EOF.  */

      if (fp->_offset < fp->_IO_buf_end - fp->_IO_buf_base)
       {
         if (
# ifdef _G_LSEEK64
             _G_LSEEK64
# else
             __lseek
# endif
             (fp->_fileno, fp->_IO_buf_end - fp->_IO_buf_base, SEEK_SET)
             != fp->_IO_buf_end - fp->_IO_buf_base)
           fp->_flags |= _IO_ERR_SEEN;
         else
           fp->_offset = fp->_IO_buf_end - fp->_IO_buf_base;
       }

      return 0;
    }
  else
    {
      /* Life is no longer good for mmap.  Punt it.  */
      (void) __munmap (fp->_IO_buf_base,
                     fp->_IO_buf_end - fp->_IO_buf_base);
    punt:
      fp->_IO_buf_base = fp->_IO_buf_end = NULL;
      _IO_setg (fp, NULL, NULL, NULL);
      if (fp->_mode <= 0)
       _IO_JUMPS ((struct _IO_FILE_plus *) fp) = &_IO_file_jumps;
      else
       _IO_JUMPS ((struct _IO_FILE_plus *) fp) = &_IO_wfile_jumps;
      fp->_wide_data->_wide_vtable = &_IO_wfile_jumps;

      return 1;
    }
}

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static _IO_size_t new_do_write ( _IO_FILE fp,
const char *  data,
_IO_size_t  to_do 
) [static]

Definition at line 501 of file fileops.c.

{
  _IO_size_t count;
  if (fp->_flags & _IO_IS_APPENDING)
    /* On a system without a proper O_APPEND implementation,
       you would need to sys_seek(0, SEEK_END) here, but is
       is not needed nor desirable for Unix- or Posix-like systems.
       Instead, just indicate that offset (before and after) is
       unpredictable. */
    fp->_offset = _IO_pos_BAD;
  else if (fp->_IO_read_end != fp->_IO_write_base)
    {
      _IO_off64_t new_pos
       = _IO_SYSSEEK (fp, fp->_IO_write_base - fp->_IO_read_end, 1);
      if (new_pos == _IO_pos_BAD)
       return 0;
      fp->_offset = new_pos;
    }
  count = _IO_SYSWRITE (fp, data, to_do);
  if (fp->_cur_column && count)
    fp->_cur_column = INTUSE(_IO_adjust_column) (fp->_cur_column - 1, data,
                                           count) + 1;
  _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base, fp->_IO_buf_base);
  fp->_IO_write_base = fp->_IO_write_ptr = fp->_IO_buf_base;
  fp->_IO_write_end = (fp->_mode <= 0
                     && (fp->_flags & (_IO_LINE_BUF+_IO_UNBUFFERED))
                     ? fp->_IO_buf_base : fp->_IO_buf_end);
  return count;
}

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Variable Documentation

Definition at line 22 of file sysdep.c.