It is defined in sys time h header file and takes two arguments the first arugment is reference to the timevalstructure and the second argument is a null pointer.
How to display wall clock time c.
The c library function clock t clock void returns the number of clock ticks elapsed since the program was launched.
Learn how to display digital clock in c programming language.
When increasing the number iterations on my computer the measured cpu time starts showing on 100000 iterations.
The gettimeofday function returns the wall clock time elapsed since the epoch and store it in the timevalstructure expressed as seconds and microseconds.
On a 32 bit system where clocks per sec equals 1000000 this function will return the same value approximately every 72 minutes.
You can see the time on your home screens by adding a widget from the clock app.
The time h header file defines two macro four variable types and various other functions for manipulating time and date.
According to my manual page on clock it says.
At the bottom of the screen tap widgets.
Add a clock widget touch and hold any empty section of a home screen.
Touch and hold any empty section of a home screen.
Posix requires that clocks per sec equals 1000000 independent of the actual resolution.
To get the number of seconds used by the cpu you will need to divide by clocks per sec.
At the bottom of the screen tap widgets.