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Full Discussion: Capture std out snapshot after 15 seconds
Top Forums Shell Programming and Scripting Capture std out snapshot after 15 seconds Post 302993642 by Chubler_XL on Sunday 12th of March 2017 06:48:44 PM
Old 03-12-2017
In bash you could have process substitution manage a named pipe for you. Below I duplicate this with exec onto file descriptor 7.

You can then simply read and discard from this file descriptor for 15 seconds,. If you can be sure of a maximum amount of data going to be sent (eg here we are limited to 10000 characters) you can simplify this to a single read statement:

Code:
#!/bin/bash
exec 7< <(./program 2>&1 )

# Discard first 15 seconds of data (limit is 10000 characters)
read -u 7 -t 15 -N 10000 discard

# Now you can read line you are interested in
read -u 7 -t 3 line

or without a size limit just read lines for 16 seconds, keeping the last read:

Code:
#!/bin/bash
exec 7< <(./program 2>&1 )

# Read data for 16 seconds
for((i=SECONDS+16;SECONDS<i;))
do
    read -u 7 -t $((i-SECONDS)) line
done

# At this point, $line will be last line output after 16 secs

Edit: Solution using coprocesses (required bash4). we run the process, discard first 10,000 characters or 15 seconds of input and then read the next line. This will also kills the process once we have the required result:

Code:
coproc { ./program 2>&1 ; }

#discard 15 seconds or 10,000 characters of input (whichever is the first)
read -u ${COPROC[0]} -t 15 -N 10000 discard

# wait up to 3 seconds for the next line of output
read -u ${COPROC[0]} -t 3 line

# kill process
kill $COPROC_PID 2> /dev/null

if [ -z "$line" ]
then
    echo "timeout - no output line after discarding early stuff"
else
    echo "Last line: $line"
fi

This could also be coded using named pipes in other shell versions if needed.
Last edited by Chubler_XL; 03-12-2017 at 08:28 PM..
These 2 Users Gave Thanks to Chubler_XL For This Post:
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LEARN ABOUT PHP

sqlite_busy_timeout

SQLITE_BUSY_TIMEOUT(3)													    SQLITE_BUSY_TIMEOUT(3)

sqlite_busy_timeout - Set busy timeout duration, or disable busy handlers

SYNOPSIS

       void sqlite_busy_timeout (resource  $dbhandle, int  $milliseconds)

DESCRIPTION

       Object oriented style (method): void SQLiteDatabase::busyTimeout (int  $milliseconds)

	Set the maximum time, in milliseconds, that SQLite will wait for a $dbhandle to become ready for use.

PARAMETERS

	      o $dbhandle
		- The SQLite Database resource; returned from sqlite_open(3) when used procedurally. This parameter is not required when using the
		object-oriented method.

	      o $milliseconds
		- The number of milliseconds. When set to 0, busy handlers will be disabled and SQLite will return immediately with a  SQLITE_BUSY
		status	code  if another process/thread has the database locked for an update.	PHP sets the default busy timeout to be 60 seconds
		when the database is opened.

	      Note

		      There are one thousand(1000) milliseconds in one second.

RETURN VALUES

	No value is returned.

EXAMPLES

       Example #1

	      Procedural style

	      <?php
	      $dbhandle = sqlite_open('sqlitedb');
	      sqlite_busy_timeout($dbhandle, 10000); // set timeout to 10 seconds
	      sqlite_busy_timeout($dbhandle, 0); // disable busy handler
	      ?>

       Example #2

	      Object oriented style

	      <?php
	      $dbhandle = new SQLiteDatabase('sqlitedb');
	      $dbhandle->busyTimeout(10000); // 10 seconds
	      $dbhandle->busyTimeout(0); // disable
	      ?>

SEE ALSO

       sqlite_open(3).

PHP Documentation Group 												    SQLITE_BUSY_TIMEOUT(3)
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