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Full Discussion: File read/ write operation
Operating Systems Linux File read/ write operation Post 302426768 by Corona688 on Wednesday 2nd of June 2010 10:58:03 PM
Old 06-02-2010
I have written AJAX-driven systems callign linux scripts, yes.
Quote:
Originally Posted by xs2punit
As ajax at the client could ONLY read the file, there is no point of locking.
We've told you over and over what the locking's for and why you need it for reading a file that something else is appending to.
Quote:
Well regarding "file release" thing: I mean that the data is not available while it is getting updates, so it seems that the file is being held until whole process is completed.
Again, linux doesn't hold the file. Locking of that sort is opt-in and you're not opting. The behavior you describe seems more and more strange...

By file do you mean a real, genuine, unparsed, honest-to-god file? Or do you actually mean your AJAX is reading output fetched from a server-side script? They act very differently, and the latter would act like what you're saying, and wouldn't need locking like you're saying. The web browser would just wait for its output. If you're reading script output, and it's arriving all at once, it's probably line-buffering. Flush the output on the server side whenever you really want the script to send. Or, just write a newline, which should flush it too.

Last edited by Corona688; 06-03-2010 at 12:04 AM..
 

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SCRIPT(1)						    BSD General Commands Manual 						 SCRIPT(1)

NAME
script -- make typescript of terminal session SYNOPSIS
script [-a] [-c COMMAND] [-f] [-q] [-t] [file] DESCRIPTION
Script makes a typescript of everything printed on your terminal. It is useful for students who need a hardcopy record of an interactive session as proof of an assignment, as the typescript file can be printed out later with lpr(1). If the argument file is given, script saves all dialogue in file. If no file name is given, the typescript is saved in the file typescript. Options: -a Append the output to file or typescript, retaining the prior contents. -c COMMAND Run the COMMAND rather than an interactive shell. This makes it easy for a script to capture the output of a program that behaves differently when its stdout is not a tty. -f Flush output after each write. This is nice for telecooperation: One person does `mkfifo foo; script -f foo' and another can super- vise real-time what is being done using `cat foo'. -q Be quiet. -t Output timing data to standard error. This data contains two fields, separated by a space. The first field indicates how much time elapsed since the previous output. The second field indicates how many characters were output this time. This information can be used to replay typescripts with realistic typing and output delays. The script ends when the forked shell exits (a control-D to exit the Bourne shell (sh(1)), and exit, logout or control-d (if ignoreeof is not set) for the C-shell, csh(1)). Certain interactive commands, such as vi(1), create garbage in the typescript file. Script works best with commands that do not manipulate the screen, the results are meant to emulate a hardcopy terminal. ENVIRONMENT
The following environment variable is utilized by script: SHELL If the variable SHELL exists, the shell forked by script will be that shell. If SHELL is not set, the Bourne shell is assumed. (Most shells set this variable automatically). SEE ALSO
csh(1) (for the history mechanism), scriptreplay(1). HISTORY
The script command appeared in 3.0BSD. BUGS
Script places everything in the log file, including linefeeds and backspaces. This is not what the naive user expects. AVAILABILITY
The script command is part of the util-linux-ng package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/. Linux July 30, 2000 Linux
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