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system_info.cpp
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system_info.cpp
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#include "system_info.h"
double SystemInfo::cpuUsage()
{
FILE *fp = fopen("/proc/stat", "r");
int status = fscanf(fp, "%s %ld %ld %ld %ld", _cpu.name, &_cpu.user, &_cpu.nice, &_cpu.system, &_cpu.idle);
if(status == 0){
fprintf(stderr,"Fail to open /proc/stat\n");
return 0.0;
}
fclose(fp);
// sum all of the values
long sum = _cpu.user + _cpu.nice +
_cpu.system + _cpu.idle;
// collect the difference between sum and the last sum
long cpu_delta = sum - _cpuLastSum;
// collect idle time
long cpu_idle = _cpu.idle - _cpuLastIdle;
// delta minus ide time
long cpu_used = cpu_delta - cpu_idle;
// percentage of utilization
double result = (100.0 * cpu_used) / cpu_delta;
_cpuLastSum = sum;
_cpuLastIdle = _cpu.idle;
return result;
}
double SystemInfo::memUsage()
{
FILE *fp = fopen("/proc/meminfo", "r");
int status = fscanf(fp, "MemTotal: %ld kB\nMemFree: %ld kB\nMemAvailable: %ld kB\nBuffers: %ld kB\nCached: %ld kB", &_mem.total, &_mem.free, &_mem.avail, &_mem.buf, &_mem.cached);
if(status == 0){
fprintf(stderr,"Fail to open /proc/meminfo\n");
return 0.0;
}
fclose(fp);
double result = (float)(_mem.free + _mem.buf + _mem.cached) / _mem.total * 100;
return result;
}
int SystemInfo::cpuTemp()
{
FILE *fp = fopen("/sys/devices/virtual/thermal/thermal_zone0/temp", "r");
long temperature = 0;
int status = fscanf(fp, "%ld", &temperature);
if(status == 0){
fprintf(stderr,"Fail to open /sys/devices/virtual/thermal/thermal_zone0/temp\n");
return 0;
}
fclose(fp);
int result = temperature / 1000;
return result;
}
void SystemInfo::interfaceIp(char *name, char * buffer)
{
struct ifaddrs *ifaddr;
if (getifaddrs(&ifaddr) == -1)
{
fprintf(stderr,"Fail to get network interfaces list!\n");
return;
}
bool found = false;
for (struct ifaddrs *ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next)
{
if (ifa->ifa_addr == NULL || (ifa->ifa_addr->sa_family != AF_INET && ifa->ifa_addr->sa_family != AF_INET6))
continue;
if (strcmp(ifa->ifa_name, name) == 0)
{
ifaddr = ifa;
found = true;
break;
}
}
if (!found){
fprintf(stderr,"Fail to found the specified network interface!\n");
return;
}
int s = getnameinfo(ifaddr->ifa_addr,
(ifaddr->ifa_addr->sa_family == AF_INET) ? sizeof(struct sockaddr_in) : sizeof(struct sockaddr_in6),
buffer, NI_MAXHOST,
NULL, 0, NI_NUMERICHOST);
if (s != 0)
{
fprintf(stderr, "Fail to get interface IP: %s\n", gai_strerror(s));
return;
}
}
struct rate_t SystemInfo::interfaceIORates(char * name){
struct ifaddrs *ifaddr;
if (getifaddrs(&ifaddr) == -1)
{
fprintf(stderr,"Fail to get network interfaces list!\n");
return _rates;
}
bool found = false;
for (struct ifaddrs *ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next)
{
if (ifa->ifa_addr == NULL || (ifa->ifa_addr->sa_family != AF_PACKET))
continue;
if (strcmp(ifa->ifa_name, name) == 0)
{
ifaddr = ifa;
found = true;
break;
}
}
if (!found){
fprintf(stderr,"Fail to found the specified network interface\n");
return _rates;
}
struct rtnl_link_stats *stats = (struct rtnl_link_stats *)ifaddr->ifa_data;
struct timespec now;
clock_gettime(CLOCK_MONOTONIC_RAW,&now);
uint32_t passed = (now.tv_sec - _time.tv_sec) * 1000 + (now.tv_nsec - _time.tv_nsec)/1000000;
_rates.download = stats->rx_bytes-_rates.totalDownload;
_rates.upload = stats->tx_bytes-_rates.totalUpload;
_rates.download /= 0.001 * passed;
_rates.upload /= 0.001 * passed;
_rates.download /= 1024;
_rates.upload /= 1024;
_rates.totalDownload = stats->rx_bytes;
_rates.totalUpload = stats->tx_bytes;
memcpy(&_time, &now, sizeof(struct timeval));
return _rates;
}