11-11-2010
Quote:
Originally Posted by
jackliang
which signal will flush the file buffer in C/C++?
eg. send a signal to flush all the file buffer to a file/stdout which out invoking fflush().
That's an unusual question... why?
There is no signal to specifically flush all buffers, unless (i) a particular application includes a facility for specifically doing that or (ii) you don't mind terminating the program, in which case any signal that causes normal termination will flush buffers before exiting. See "man 7 signal".
This User Gave Thanks to JohnGraham For This Post:
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FLUSH(3) 1 FLUSH(3)
flush - Flush system output buffer
SYNOPSIS
void flush (void )
DESCRIPTION
Flushes the system write buffers of PHP and whatever backend PHP is using (CGI, a web server, etc). This attempts to push current output
all the way to the browser with a few caveats.
flush(3) may not be able to override the buffering scheme of your web server and it has no effect on any client-side buffering in the
browser. It also doesn't affect PHP's userspace output buffering mechanism. This means you will have to call both ob_flush(3) and flush(3)
to flush the ob output buffers if you are using those.
Several servers, especially on Win32, will still buffer the output from your script until it terminates before transmitting the results to
the browser.
Server modules for Apache like mod_gzip may do buffering of their own that will cause flush(3) to not result in data being sent immedi-
ately to the client.
Even the browser may buffer its input before displaying it. Netscape, for example, buffers text until it receives an end-of-line or the
beginning of a tag, and it won't render tables until the </table> tag of the outermost table is seen.
Some versions of Microsoft Internet Explorer will only start to display the page after they have received 256 bytes of output, so you may
need to send extra whitespace before flushing to get those browsers to display the page.
RETURN VALUES
No value is returned.
SEE ALSO
ob_flush(3), ob_clean(3), ob_end_flush(3), ob_end_clean(3).
PHP Documentation Group FLUSH(3)