07-22-2019
Hello Vinod,
When you see man page for ps you see like.
Quote:
etimes ELAPSED elapsed time since the process was started, in seconds.
So Rudi's code is actually comparing if a process is older then 7200 seconds which is 2 hours and if condition is TRUE it prints it simply(which is your question too).
Thanks,
R. Singh
This User Gave Thanks to RavinderSingh13 For This Post:
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LEARN ABOUT OPENSOLARIS
alarm
alarm(2) System Calls alarm(2)
NAME
alarm - schedule an alarm signal
SYNOPSIS
#include <unistd.h>
unsigned int alarm(unsigned int seconds);
DESCRIPTION
The alarm() function causes the system to generate a SIGALRM signal for the process after the number of real-time seconds specified by sec-
onds have elapsed (see signal.h(3HEAD)). Processor scheduling delays may prevent the process from handling the signal as soon as it is
generated.
If seconds is 0, a pending alarm request, if any, is cancelled. If seconds is greater than LONG_MAX/hz, seconds is rounded down to
LONG_MAX/hz. The value of hz is normally 100.
Alarm requests are not stacked; only one SIGALRM generation can be scheduled in this manner; if the SIGALRM signal has not yet been gen-
erated, the call will result in rescheduling the time at which the SIGALRM signal will be generated.
The fork(2) function clears pending alarms in the child process. A new process image created by one of the exec(2) functions inherits the
time left to an alarm signal in the old process's image.
RETURN VALUES
If there is a previous alarm request with time remaining, alarm() returns a non-zero value that is the number of seconds until the
previous request would have generated a SIGALRM signal. Otherwise, alarm() returns 0.
ERRORS
The alarm() function is always successful; no return value is reserved to indicate an error.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Standard |
+-----------------------------+-----------------------------+
|MT-Level |Async-Signal-Safe |
+-----------------------------+-----------------------------+
SEE ALSO
exec(2), fork(2), signal.h(3HEAD), attributes(5), standards(5)
SunOS 5.11 6 Jun 2007 alarm(2)