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Full Discussion: Need help in restarting process
Top Forums Shell Programming and Scripting Need help in restarting process Post 302890149 by Nakul_sh on Tuesday 25th of February 2014 11:26:48 AM
Old 02-25-2014
Need help in restarting process
Hi friends,

I have one unix command which is used to check the network status manually.
followig is the command
Code:
check_Network

this command give follwoing status
Code:
Network 1 is ok
    Network 2 is ok
    network 3 is ok
    network 4 is ok
    .
    .
    .
    .
    Network 10 is ok

Sometimes, command
Code:
check_Network

does not give any output and hanges at that moment. I need to press ctrl+c to come back to server command prompt
After that i restart network handler process by command
Code:
 restart ntework_all

After that command
Code:
check_Network

gives correct output as above.

Now, I want to automate this task by writting shell script.
1) Script should check netwok status ater regular interval (lets say 20 mins)
2) if command
Code:
check_Network

dont give any output and hanged. Then it should come out from hanged state (Similler to pressing ctrl+c) and restart network handler processes by
Code:
restart ntework_all

. and check network status again
3) After restart it should send mail to me saying "Network Handler has been restarted at <Time> "
 

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LEARN ABOUT OSX

alarm

ALARM(3)						   BSD Library Functions Manual 						  ALARM(3)

NAME

     alarm -- set signal timer alarm

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <unistd.h>

     unsigned
     alarm(unsigned seconds);

DESCRIPTION

     This interface is made obsolete by setitimer(2).

     The alarm() function sets a timer to deliver the signal SIGALRM to the calling process after the specified number of seconds.  If an alarm
     has already been set with alarm() but has not been delivered, another call to alarm() will supersede the prior call.  The request alarm(0)
     voids the current alarm and the signal SIGALRM will not be delivered.

     Due to setitimer(2) restriction the maximum number of seconds allowed is 100000000.

RETURN VALUES

     The return value of alarm() is the amount of time left on the timer from a previous call to alarm().  If no alarm is currently set, the
     return value is 0.

SEE ALSO

     setitimer(2), sigaction(2), sigpause(2), sigvec(2), signal(3), sleep(3), ualarm(3), usleep(3)

HISTORY

     An alarm() function appeared in Version 7 AT&T UNIX.

BSD
								  April 19, 1994							       BSD
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