macOS

Platform-specific code for macOS. Everything in this module, including the headers, is wrapped in the following preprocessor macro

#if defined(__APPLE__) || defined(__MACH__)
/* 
... code ...
*/
#endif /* defined(__APPLE__) || defined(__MACH__) */

Structs

ProcessData

ProcessData is a struct that tracks cpu and memory usage of a process. It needs to be regularly updated with calls to update_process() in order to provide accurate information

typedef struct {
double total_user_time;
double total_kernel_time;
double last_total_consumed;
double percent_cpu;

uint64_t virtual_memory;
uint64_t resident_memory;

time_t timestamp;
time_t last_timestamp;
} ProcessData;

Functions

new_ProcessData

Returns a pointer to a ProcessData struct.

ProcessData *new_ProcessData();

update_process

Updates a ProcessData struct. This should be called in a loop or at specific intervals to measure proper usage data. An example is below

int update_process(pid_t pid, ProcessData *proc);

/* Example */
pid_t pid = getpid();
ProcessData *pd = new_ProcessData();
for (int i = 0; i < 10; i++) {
    update_process(pid, pd);
    printf("CPU: %.2f\n", pd->percent_cpu);
    sleep(1);
}
free(pd);

reallocarray

reallocarray is reimplemented for macOS because Apple doesn't expose their implementation. This is taken straight from the OpenBSD source

void *reallocarray(void *optr, size_t nmemb, size_t size);

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