sg_get_cpu_stats(3) sg_get_cpu_stats(3) NAME sg_get_cpu_stats, sg_get_cpu_stats_r, sg_get_cpu_stats_diff, sg_get_cpu_stats_diff_between, sg_get_cpu_percents, sg_get_cpu_percents_of, sg_get_cpu_percents_r, sg_free_cpu_stats - get cpu usage SYNOPSIS #include <statgrab.h> sg_cpu_percents *sg_get_cpu_percents (size_t *entries); sg_cpu_percents *sg_get_cpu_percents_of (sg_cpu_percent_source cps, size_t *entries); sg_cpu_percents *sg_get_cpu_percents_r (const sg_cpu_stats *whereof, size_t *entries); void sg_free_cpu_percents (sg_cpu_percents *data); sg_cpu_stats *sg_get_cpu_stats (size_t *entries); sg_cpu_stats *sg_get_cpu_stats_diff (size_t *entries); sg_cpu_stats *sg_get_cpu_stats_r (size_t *entries); sg_cpu_stats *sg_get_cpu_stats_diff_between (const sg_cpu_stats *cpu_now, const sg_cpu_stats *cpu_last, size_t *entries); sg_error sg_free_cpu_stats (sg_cpu_stats *data); DESCRIPTION These are the categories of data delivered by the cpu stats module: sg_get_cpu_stats() and sg_get_cpu_stats_r() deliver native cpu counters since the machine has been started, sg_get_cpu_stats_diff() and sg_get_cpu_stats_diff_between() deliver native cpu counters between two sg_get_cpu_stats() calls and sg_get_cpu_percents_of() and sg_get_cpu_per- cents_r() deliver correlated relative cpu counters (where total is 100%). API Shortcut +---------------------------+-------------------+----------------------+ | function | returns | data owner | +---------------------------+-------------------+----------------------+ | sg_get_cpu_stats | sg_cpu_stats * | libstatgrab (thread | | | | local) | +---------------------------+-------------------+----------------------+ | sg_get_cpu_stats_r | sg_cpu_stats * | caller | +---------------------------+-------------------+----------------------+ | sg_get_cpu_stats_diff | sg_cpu_stats * | libstatgrab (thread | | | | local) | +---------------------------+-------------------+----------------------+ | sg_get_cpu_stats_diff_be- | sg_cpu_stats * | caller | | tween | | | +---------------------------+-------------------+----------------------+ | sg_get_cpu_percents_of | sg_cpu_percents * | libstatgrab (thread | | | | local) | +---------------------------+-------------------+----------------------+ | sg_get_cpu_percents_r | sg_cpu_percents * | caller | +---------------------------+-------------------+----------------------+ The sg_cpu_stats buffer received from sg_get_cpu_stats_r() and the sg_get_cpu_stats_diff_between() as well as the sg_cpu_percents buffer re- ceived from sg_get_cpu_percents_r() must be freed using sg_free_cpu_stats() or the sg_free_cpu_percents(), respectively, when not needed any more. The caller is responsible for doing it. The value stored (the "ticks") will vary between operating systems. For ex- ample Solaris has a total of 100 per second, while Linux has substantially more. Also, different operating systems store different information - you won't find nice cpu on Solaris for example. Modern systems shall provide information about the clock tick resolution by invoking sysconf(_SC_CLK_TCK). RETURN VALUES There are two structures returned by the CPU statistics functions. typedef struct { unsigned long long user; unsigned long long kernel; unsigned long long idle; unsigned long long iowait; unsigned long long swap; unsigned long long nice; unsigned long long total; unsigned long long context_switches; unsigned long long voluntary_context_switches; unsigned long long involuntary_context_switches; unsigned long long syscalls; unsigned long long interrupts; unsigned long long soft_interrupts; time_t systime; } sg_cpu_stats; typedef struct { double user; double kernel; double idle; double iowait; double swap; double nice; time_t time_taken; } sg_cpu_percents; user kernel idle iowait swap nice total The different CPU states. context_switches voluntary_context_switches involuntary_context_switches syscalls interrupts soft_interrupts The different program actions on CPU. systime time_taken The time taken in seconds since the last call of the function, or the system time. SEE ALSO statgrab(3) WEBSITE <https://libstatgrab.org/> libstatgrab 2019-03-08 sg_get_cpu_stats(3)
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | SEE ALSO | WEBSITE
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