I am using the FpTimes function from the BaseUnix package. The documentation says it returns -1 on an error, otherwise the number of clock ticks since boot time. However, the return type of this function is TClock, which is unsigned.

This, if I say:

X := BaseUnix.FpTimes(T);

if (X -1) then ...

I get a compiler-time warning (range check error while evaluating constants).

Should the return type not be unsigned? Is checking the result against -1 OK?

-- Bruce
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Bruce Bauman wrote

I am using the FpTimes function from the BaseUnix package. The documentation says it returns -1 on an error, otherwise the number of clock ticks since boot time. However, the return type of this function is TClock, which is unsigned.

From "man 3 times":

If an
error occurs, times() returns the value ((clock_t)-1), and sets errno to indicate the error.

So check against TClock(-1).

Jonas

Bruce Bauman wrote

I am using the FpTimes function from the BaseUnix package. The documentation says it returns -1 on an error, otherwise the number of clock ticks since boot time.

What does clock ticks exactly mean?
I am searching for an equivalent to getticks in windows. Rainer

2009/11/17 Rainer Stratmann :

If you want to measure uptime, then you need to use sysinfo. The resolution is seconds, though.

Henry

En/na Rainer Stratmann ha escrit:

There isn't one.
Lazarus defines a compatibility GetTickCount as such:

Result := DWord(Trunc(Now * 24 * 60 * 60 * 1000));

it's not the same as windows' GetTickCount but it can be used if you just want to calculate elapsed time (provided the clock doesn't jump back/forward).

Bye