12-16-2008
kill a process which run out of time
hello everybody!!
i want ur help! it is urgent!!
...
pid=fork();
if(pid==0)
{
execl(a program);
exit(1);}
else if (pid>0)
{
timer(5); //(command 1)timer is a function that count up to 5sec
if(kill(pid,0)==0)kill(pid,9);//(command 2)
wait(&status);
....
}
else
perror("error");
....
The purpose of command1 and command2 is, if the execution of child process
does not finish in 5sec(timer(5)), i want to kill it (kill(pid,9)).
Can anybody pleasee help why this thing does not work properly!!!
THANX in advance!:-)
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KILL(1) BSD General Commands Manual KILL(1)
NAME
kill -- terminate or signal a process
SYNOPSIS
kill [-s signal_name] pid ...
kill -l [exit_status]
kill -signal_name pid ...
kill -signal_number pid ...
DESCRIPTION
The kill utility sends a signal to the processes specified by the pid operands.
Only the super-user may send signals to other users' processes.
The options are as follows:
-s signal_name
A symbolic signal name specifying the signal to be sent instead of the default TERM.
-l [exit_status]
If no operand is given, list the signal names; otherwise, write the signal name corresponding to exit_status.
-signal_name
A symbolic signal name specifying the signal to be sent instead of the default TERM.
-signal_number
A non-negative decimal integer, specifying the signal to be sent instead of the default TERM.
The following PIDs have special meanings:
-1 If superuser, broadcast the signal to all processes; otherwise broadcast to all processes belonging to the user.
Some of the more commonly used signals:
1 HUP (hang up)
2 INT (interrupt)
3 QUIT (quit)
6 ABRT (abort)
9 KILL (non-catchable, non-ignorable kill)
14 ALRM (alarm clock)
15 TERM (software termination signal)
Some shells may provide a builtin kill command which is similar or identical to this utility. Consult the builtin(1) manual page.
EXIT STATUS
The kill utility exits 0 on success, and >0 if an error occurs.
EXAMPLES
Terminate the processes with PIDs 142 and 157:
kill 142 157
Send the hangup signal (SIGHUP) to the process with PID 507:
kill -s HUP 507
Terminate the process group with PGID 117:
kill -- -117
SEE ALSO
builtin(1), csh(1), killall(1), ps(1), sh(1), kill(2), sigaction(2)
STANDARDS
The kill utility is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible.
HISTORY
A kill command appeared in Version 3 AT&T UNIX.
BUGS
A replacement for the command ``kill 0'' for csh(1) users should be provided.
BSD
April 28, 1995 BSD