The system call you’re looking for is sysinfo(). It’s defined in sys/sysinfo.h Its signature is: int sysinfo(struct sysinfo *info) Since kernel 2.4, the structure has looked like this: struct sysinfo { long uptime; /* Seconds since boot */ unsigned long loads[3]; /* 1, 5, and 15 minute load averages */ unsigned long totalram; /* Total … Read more
public TimeSpan UpTime { get { using (var uptime = new PerformanceCounter(“System”, “System Up Time”)) { uptime.NextValue(); //Call this an extra time before reading its value return TimeSpan.FromSeconds(uptime.NextValue()); } } }
I think I worked it out. time() carries on incrementing while the device is asleep, but of course can be manipulated by the operating system or user. However, the Kernel boottime (a timestamp of when the system last booted) also changes when the system clock is changed, therefore even though both these values are not … Read more