You should have received a copy of the GNU General Public License
along with GNU Emacs; see the file COPYING. If not, write to
-the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA. */
/*
* runs, it copies the table to where these parameters live during
* execution. This data is in text space, so it cannot be modified here
* before saving the executable, so the data is written manually. In
- * addition, the table does not have a label, and the nearest accessable
- * label (mcount) is not prefixed with a '_', thus making it inaccessable
+ * addition, the table does not have a label, and the nearest accessible
+ * label (mcount) is not prefixed with a '_', thus making it inaccessible
* from within C programs. To overcome this, emacs's executable is passed
* through the command 'nm %s | fgrep mcount' into a pipe, and the
* resultant output is then used to find the address of 'mcount'. As far as
register int i, nwrite, ret;
char buf[80];
extern int errno;
+ /* This is the normal amount to write at once.
+ It is the size of block that NFS uses. */
+ int writesize = 1 << 13;
int pagesize = getpagesize ();
- char *zeros = (char *) alloca (pagesize);
+ char zeros[1 << 13];
- bzero (zeros, pagesize);
+ bzero (zeros, sizeof (zeros));
for (i = 0; ptr < end;)
{
- /* distance to next multiple of pagesize. */
- nwrite = (((int) ptr + pagesize) & -pagesize) - (int) ptr;
+ /* Distance to next multiple of writesize. */
+ nwrite = (((int) ptr + writesize) & -writesize) - (int) ptr;
/* But not beyond specified end. */
if (nwrite > end - ptr) nwrite = end - ptr;
ret = write (new, ptr, nwrite);
&& errno == EFAULT
#endif
)
- write (new, zeros, nwrite);
+ {
+ /* Write only a page of zeros at once,
+ so that we we don't overshoot the start
+ of the valid memory in the old data segment. */
+ if (nwrite > pagesize)
+ nwrite = pagesize;
+ write (new, zeros, nwrite);
+ }
+#if 0 /* Now that we have can ask `write' to write more than a page,
+ it is legit for write do less than the whole amount specified. */
else if (nwrite != ret)
{
sprintf (buf,
ptr, new, nwrite, ret, errno);
PERROR (buf);
}
+#endif
i += nwrite;
ptr += nwrite;
}