Re: [Gumstix-users] File finished writting

[Vikram K. <vk...@re...>]

Here is something off the top of my head:

Create a script file, eg "extract.sh" as follows


ls -l targetfilenamehere | sed 's/[a-z]//g' | sed 's/[A-Z]//g' | sed 
's/-//g' | sed 's/\.//g' | sed 's/ /\n/g' | sed '/^$/d' | head -2 | tail 
-1 > /tmp/targetsize.txt

This should put the size of the file in bytes into /tmp/targetsize.txt

After you are done with your fclose in the program, do a while loop as 
follows

while(1)
{
  /* Call the script */
  system("./extract.sh");
  
  /* Check the contents of /tmp/targetsize.txt */
  /* Insert code to open /tmp/targetsize.txt and read the integer */

  /* Check if the size is what you expect */
  if( read_size == expected_size)
  {
    printf("\n Done.");
    exit(0);
  }
  else
  {
    sleep(1);
  }
}


If you don't know the expected size, you can merely save the previous 
size, and if the read_size is same as previous_size, you can "assume" that 
nothing changed in a second, and hence, "probably" the file writing work 
is done.

It is dirty, but you should have it working in a few minutes

Hope this helps

Vikram

On Wed, 11 Jul 2007, Joshua Hintze wrote:

joshh>Date: Wed, 11 Jul 2007 13:03:56 -0600
joshh>From: Joshua Hintze <jo...@pr...>
joshh>Reply-To: General mailing list for gumstix users.
joshh>    <gum...@li...>
joshh>To: 'General mailing list for gumstix users.'
joshh>    <gum...@li...>
joshh>Subject: [Gumstix-users] File finished writting
joshh>
joshh>Hey guys,
joshh>
joshh> 
joshh>
joshh>I was wondering if there is some linux command or way to tell if a file has
joshh>finished writing. Here is why I ask. I have a Verdex board with the USB host
joshh>connected to a USB jump drive. In my C++ code I will write to a file handle
joshh>that is opened on the mounted USB thumb drive and write about a 2 meg file
joshh>to it. 
joshh>
joshh> 
joshh>
joshh>However, the write command (actually an mmap) finishes immediately and I
joshh>fclose the file, but in reality the OS is still writing out to the USB. This
joshh>is apparent when you try to unmount or stupidly yank the thumb drive out. 
joshh>
joshh> 
joshh>
joshh>So my question is..is there a way to determine if the file writing has
joshh>finished? Especially some command I can run from within a program.
joshh>
joshh> 
joshh>
joshh>Thanks,
joshh>
joshh> 
joshh>
joshh>Josh
joshh>
joshh> 
joshh>
joshh>