unix.c: Remove mmap code.
2005-09-10 Janne Blomqvist <jblomqvi@cc.hut.fi> * io/unix.c: Remove mmap code. From-SVN: r104127
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@ -1,3 +1,7 @@
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2005-09-10 Janne Blomqvist <jblomqvi@cc.hut.fi>
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* io/unix.c: Remove mmap code.
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2005-09-09 Francois-Xavier Coudert <coudert@clipper.ens.fr>
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PR libfortran/23784
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@ -140,7 +140,7 @@ typedef struct
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int special_file; /* =1 if the fd refers to a special file */
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unsigned unbuffered:1, mmaped:1;
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unsigned unbuffered:1;
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char small_buffer[BUFFER_SIZE];
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@ -371,7 +371,6 @@ fd_alloc (unix_stream * s, gfc_offset where,
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s->buffer = new_buffer;
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s->len = read_len;
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s->mmaped = 0;
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}
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@ -570,201 +569,6 @@ fd_open (unix_stream * s)
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}
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/*********************************************************************
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mmap stream functions
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Because mmap() is not capable of extending a file, we have to keep
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track of how long the file is. We also have to be able to detect end
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of file conditions. If there are multiple writers to the file (which
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can only happen outside the current program), things will get
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confused. Then again, things will get confused anyway.
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*********************************************************************/
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#if HAVE_MMAP
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static int page_size, page_mask;
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/* mmap_flush()-- Deletes a memory mapping if something is mapped. */
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static try
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mmap_flush (unix_stream * s)
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{
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if (!s->mmaped)
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return fd_flush (s);
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if (s->buffer == NULL)
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return SUCCESS;
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if (munmap (s->buffer, s->active))
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return FAILURE;
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s->buffer = NULL;
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s->active = 0;
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return SUCCESS;
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}
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/* mmap_alloc()-- mmap() a section of the file. The whole section is
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* guaranteed to be mappable. */
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static try
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mmap_alloc (unix_stream * s, gfc_offset where,
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int *len __attribute__ ((unused)))
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{
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gfc_offset offset;
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int length;
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char *p;
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if (mmap_flush (s) == FAILURE)
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return FAILURE;
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offset = where & page_mask; /* Round down to the next page */
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length = ((where - offset) & page_mask) + 2 * page_size;
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p = mmap (NULL, length, s->prot, MAP_SHARED, s->fd, offset);
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if (p == (char *) MAP_FAILED)
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return FAILURE;
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s->mmaped = 1;
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s->buffer = p;
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s->buffer_offset = offset;
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s->active = length;
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return SUCCESS;
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}
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static char *
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mmap_alloc_r_at (unix_stream * s, int *len, gfc_offset where)
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{
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gfc_offset m;
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if (where == -1)
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where = s->logical_offset;
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m = where + *len;
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if ((s->buffer == NULL || s->buffer_offset > where ||
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m > s->buffer_offset + s->active) &&
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mmap_alloc (s, where, len) == FAILURE)
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return NULL;
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if (m > s->file_length)
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{
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*len = s->file_length - s->logical_offset;
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s->logical_offset = s->file_length;
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}
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else
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s->logical_offset = m;
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return s->buffer + (where - s->buffer_offset);
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}
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static char *
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mmap_alloc_w_at (unix_stream * s, int *len, gfc_offset where)
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{
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if (where == -1)
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where = s->logical_offset;
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/* If we're extending the file, we have to use file descriptor
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* methods. */
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if (where + *len > s->file_length)
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{
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if (s->mmaped)
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mmap_flush (s);
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return fd_alloc_w_at (s, len, where);
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}
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if ((s->buffer == NULL || s->buffer_offset > where ||
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where + *len > s->buffer_offset + s->active ||
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where < s->buffer_offset + s->active) &&
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mmap_alloc (s, where, len) == FAILURE)
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return NULL;
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s->logical_offset = where + *len;
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return s->buffer + where - s->buffer_offset;
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}
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static int
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mmap_seek (unix_stream * s, gfc_offset offset)
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{
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s->logical_offset = offset;
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return SUCCESS;
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}
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static try
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mmap_close (unix_stream * s)
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{
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try t;
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t = mmap_flush (s);
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if (close (s->fd) < 0)
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t = FAILURE;
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free_mem (s);
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return t;
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}
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static try
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mmap_sfree (unix_stream * s __attribute__ ((unused)))
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{
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return SUCCESS;
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}
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/* mmap_open()-- mmap_specific open. If the particular file cannot be
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* mmap()-ed, we fall back to the file descriptor functions. */
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static try
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mmap_open (unix_stream * s __attribute__ ((unused)))
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{
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char *p;
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int i;
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page_size = getpagesize ();
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page_mask = ~0;
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p = mmap (0, page_size, s->prot, MAP_SHARED, s->fd, 0);
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if (p == (char *) MAP_FAILED)
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{
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fd_open (s);
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return SUCCESS;
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}
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munmap (p, page_size);
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i = page_size >> 1;
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while (i != 0)
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{
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page_mask <<= 1;
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i >>= 1;
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}
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s->st.alloc_r_at = (void *) mmap_alloc_r_at;
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s->st.alloc_w_at = (void *) mmap_alloc_w_at;
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s->st.sfree = (void *) mmap_sfree;
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s->st.close = (void *) mmap_close;
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s->st.seek = (void *) mmap_seek;
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s->st.truncate = (void *) fd_truncate;
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if (lseek (s->fd, s->file_length, SEEK_SET) < 0)
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return FAILURE;
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return SUCCESS;
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}
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#endif
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/*********************************************************************
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memory stream functions - These are used for internal files
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* around it. */
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static stream *
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fd_to_stream (int fd, int prot, int avoid_mmap)
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fd_to_stream (int fd, int prot)
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{
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struct stat statbuf;
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unix_stream *s;
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@ -920,14 +724,7 @@ fd_to_stream (int fd, int prot, int avoid_mmap)
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s->file_length = S_ISREG (statbuf.st_mode) ? statbuf.st_size : -1;
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s->special_file = !S_ISREG (statbuf.st_mode);
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#if HAVE_MMAP
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if (avoid_mmap)
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fd_open (s);
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else
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mmap_open (s);
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#else
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fd_open (s);
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#endif
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return (stream *) s;
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}
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@ -1180,7 +977,7 @@ open_external (unit_flags *flags)
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internal_error ("open_external(): Bad action");
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}
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return fd_to_stream (fd, prot, 0);
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return fd_to_stream (fd, prot);
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}
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stream *
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input_stream (void)
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{
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return fd_to_stream (STDIN_FILENO, PROT_READ, 1);
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return fd_to_stream (STDIN_FILENO, PROT_READ);
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}
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stream *
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output_stream (void)
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{
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return fd_to_stream (STDOUT_FILENO, PROT_WRITE, 1);
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return fd_to_stream (STDOUT_FILENO, PROT_WRITE);
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}
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stream *
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error_stream (void)
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{
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return fd_to_stream (STDERR_FILENO, PROT_WRITE, 1);
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return fd_to_stream (STDERR_FILENO, PROT_WRITE);
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}
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/* init_error_stream()-- Return a pointer to the error stream. This
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