What API do I call to get the system uptime?

Question

I would like to get the system uptime from within a C application running on a linux-based system. I don\'t want to call uptime(1) and parse the output, I\'d like to call t

Answer 1

That would be something like this.

#include 
#include 
#include        /* for _syscallX macros/related stuff */
#include        /* for struct sysinfo */
#include 

long get_uptime()
{
    struct sysinfo s_info;
    int error = sysinfo(&s_info);
    if(error != 0)
    {
        printf("code error = %d\n", error);
    }
    return s_info.uptime;
}

See "man sysinfo" for more info.