But it actually depends on the operating system and CPU speed etc. 2) and there the precision was only 1 ms. h> void do_gettimeofday(struct timeval *tv) Examples of system calls that can be implemented as vsyscalls are: getpid or gettimeofday. If tzp is not a null pointer, the behavior is unspecified. ![]() Problem: gettimeofday() can be skewed by NTP synchronization, leap seconds, and resetting of the system clock. htaccess configuration file, like so: #set max post size php_value post_max_size 20M. We’ll first create a Unix epoch which corresponds to seconds since January 1st 1970 at 00:00:00 UTC. On the other hand, the calling gettimeofday and clock_gettime themselves have cost. ![]() ![]() Linux gettimeofday example There are a lot of interesting posts on the internet about how it’s work (see the Links section), so I will not repeat them, I will just put some short summary here.
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