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Full Discussion: Making a stopwatch function
Top Forums Shell Programming and Scripting Making a stopwatch function Post 302529152 by ifthanwhile on Wednesday 8th of June 2011 04:12:40 PM
Old 06-08-2011
Making a stopwatch function

#The first part of this works fine a period prints every 15 seconds (ping –c 3, takes 2 seconds). However no “Minutes since start = “ message prints.

#By all rights it should print 2 times once when it is outputted from “grep” and a second time when cat reads it. I would use cron but I am not sure how to make cron work the way I need it to for this program, I need a stopwatch that notifies every 60 seconds, 5 minutes, 20 minutes etc…

#I know this is a roundabout method but I am still pretty new to UNIX so go easy on me. Other methods of doing this would be great but I would really appreciate help getting this to work as it would give me a better understanding.

#The script is as follows..

:
Code:
# Contained test of principal
#
cnt=0
while [ $cnt -lt 600 ]
 do
    while [ $cnt -lt 300 ]
     do
      echo .
      ping -c 3 not_connected_IP>>/tmp/pinglog$$.txt
      sleep 13
      ((cnt=cnt+15))
     done

    while [ $cnt -lt 300 ]
     do
      echo -n "Minutes since start = " > divres
      echo "scale=2; $cnt/60" | bc >> divres
      if cat divres | grep .00
       then
        echo
        cat divres
      fi
     done
 done
rm -r /tmp/pinglog$$.txt


Last edited by pludi; 06-08-2011 at 05:18 PM..
 

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PCAP_LOOP(3PCAP)														  PCAP_LOOP(3PCAP)

NAME
pcap_loop, pcap_dispatch - process packets from a live capture or savefile SYNOPSIS
#include <pcap/pcap.h> typedef void (*pcap_handler)(u_char *user, const struct pcap_pkthdr *h, const u_char *bytes); int pcap_loop(pcap_t *p, int cnt, pcap_handler callback, u_char *user); int pcap_dispatch(pcap_t *p, int cnt, pcap_handler callback, u_char *user); DESCRIPTION
pcap_loop() processes packets from a live capture or ``savefile'' until cnt packets are processed, the end of the ``savefile'' is reached when reading from a ``savefile'', pcap_breakloop() is called, or an error occurs. It does not return when live read timeouts occur. A value of -1 or 0 for cnt is equivalent to infinity, so that packets are processed until another ending condition occurs. pcap_dispatch() processes packets from a live capture or ``savefile'' until cnt packets are processed, the end of the current bufferful of packets is reached when doing a live capture, the end of the ``savefile'' is reached when reading from a ``savefile'', pcap_breakloop() is called, or an error occurs. Thus, when doing a live capture, cnt is the maximum number of packets to process before returning, but is not a minimum number; when reading a live capture, only one bufferful of packets is read at a time, so fewer than cnt packets may be processed. A value of -1 or 0 for cnt causes all the packets received in one buffer to be processed when reading a live capture, and causes all the packets in the file to be processed when reading a ``savefile''. (In older versions of libpcap, the behavior when cnt was 0 was undefined; different platforms and devices behaved differently, so code that must work with older versions of libpcap should use -1, nor 0, as the value of cnt.) callback specifies a pcap_handler routine to be called with three arguments: a u_char pointer which is passed in the user argument to pcap_loop() or pcap_dispatch(), a const struct pcap_pkthdr pointer pointing to the packet time stamp and lengths, and a const u_char pointer to the first caplen (as given in the struct pcap_pkthdr a pointer to which is passed to the callback routine) bytes of data from the packet. The struct pcap_pkthdr and the packet data are not to be freed by the callback routine, and are not guaranteed to be valid after the callback routine returns; if the code needs them to be valid after the callback, it must make a copy of them. RETURN VALUE
pcap_loop() returns 0 if cnt is exhausted, -1 if an error occurs, or -2 if the loop terminated due to a call to pcap_breakloop() before any packets were processed. It does not return when live read timeouts occur; instead, it attempts to read more packets. pcap_dispatch() returns the number of packets processed on success; this can be 0 if no packets were read from a live capture (if, for example, they were discarded because they didn't pass the packet filter, or if, on platforms that support a read timeout that starts before any packets arrive, the timeout expires before any packets arrive, or if the file descriptor for the capture device is in non-blocking mode and no packets were available to be read) or if no more packets are available in a ``savefile.'' It returns -1 if an error occurs or -2 if the loop terminated due to a call to pcap_breakloop() before any packets were processed. If your application uses pcap_breakloop(), make sure that you explicitly check for -1 and -2, rather than just checking for a return value < 0. If -1 is returned, pcap_geterr() or pcap_perror() may be called with p as an argument to fetch or display the error text. SEE ALSO
pcap(3PCAP), pcap_geterr(3PCAP), pcap_breakloop(3PCAP) 24 December 2008 PCAP_LOOP(3PCAP)
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