44 lines
1.3 KiB
C
44 lines
1.3 KiB
C
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#include <libproc.h>
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#include <time.h>
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#include <mach/mach_time.h>
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#include <stdlib.h>
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#include <math.h>
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#include "lfmacos.h"
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ProcessData *new_ProcessData() {
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ProcessData *pd = malloc(sizeof(ProcessData));
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pd->last_total_consumed = -1.0;
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return pd;
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}
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int update_process(pid_t pid, ProcessData *proc) {
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struct proc_taskinfo taskinfo;
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const int r = proc_pidinfo(pid, PROC_PIDTASKINFO, 0, &taskinfo, PROC_PIDTASKINFO_SIZE);
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if (r != PROC_PIDTASKINFO_SIZE) {
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return 1;
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}
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mach_timebase_info_data_t info;
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mach_timebase_info(&info);
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const double ns_per_tick = (double)info.numer / (double)info.denom;
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time(&(proc->timestamp));
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proc->total_kernel_time = (taskinfo.pti_total_system * ns_per_tick) / 1000000000.0;
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proc->total_user_time = (taskinfo.pti_total_user * ns_per_tick) / 1000000000.0;
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proc->virtual_memory = taskinfo.pti_virtual_size;
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proc->resident_memory = taskinfo.pti_resident_size;
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if (proc->last_total_consumed > -1.0) {
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proc->percent_cpu = fabs(100.0 *
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(proc->total_user_time + proc->total_kernel_time - proc->last_total_consumed) /
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(proc->last_timestamp - proc->timestamp));
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} else {
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proc->percent_cpu = 0.0;
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}
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proc->last_timestamp = proc->timestamp;
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proc->last_total_consumed = proc->total_kernel_time + proc->total_user_time;
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return 0;
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}
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