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#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <pwd.h>
#include <stdlib.h>
#include <AK/HashMap.h>
#include <AK/AKString.h>
#include <AK/Vector.h>
#include <AK/QuickSort.h>
static HashMap<unsigned, String>* s_usernames;
struct Process {
pid_t pid;
unsigned nsched;
String name;
String state;
String user;
String priority;
unsigned linear;
unsigned committed;
unsigned nsched_since_prev;
unsigned cpu_percent;
unsigned cpu_percent_decimal;
};
struct Snapshot {
HashMap<unsigned, Process> map;
dword sum_nsched { 0 };
};
static Snapshot get_snapshot()
{
Snapshot snapshot;
FILE* fp = fopen("/proc/all", "r");
if (!fp) {
perror("failed to open /proc/all");
exit(1);
}
for (;;) {
char buf[4096];
char* ptr = fgets(buf, sizeof(buf), fp);
if (!ptr)
break;
auto parts = String(buf, Chomp).split(',');
if (parts.size() < 17)
break;
bool ok;
pid_t pid = parts[0].to_uint(ok);
ASSERT(ok);
unsigned nsched = parts[1].to_uint(ok);
ASSERT(ok);
snapshot.sum_nsched += nsched;
Process process;
process.pid = pid;
process.nsched = nsched;
unsigned uid = parts[5].to_uint(ok);
ASSERT(ok);
process.user = s_usernames->get(uid);
process.priority = parts[16];
process.state = parts[7];
process.name = parts[11];
process.linear = parts[12].to_uint(ok);
ASSERT(ok);
process.committed = parts[13].to_uint(ok);
ASSERT(ok);
snapshot.map.set(pid, move(process));
}
int rc = fclose(fp);
ASSERT(rc == 0);
return snapshot;
}
int main(int, char**)
{
s_usernames = new HashMap<unsigned, String>();
setpwent();
while (auto* passwd = getpwent())
s_usernames->set(passwd->pw_uid, passwd->pw_name);
endpwent();
Vector<Process*> processes;
auto prev = get_snapshot();
usleep(10000);
for (;;) {
auto current = get_snapshot();
auto sum_diff = current.sum_nsched - prev.sum_nsched;
printf("\033[3J\033[H\033[2J");
printf("\033[47;30m%6s %3s % 8s % 8s %6s %6s %4s %s\033[K\033[0m\n",
"PID",
"PRI",
"USER",
"STATE",
"LINEAR",
"COMMIT",
"%CPU",
"NAME");
for (auto& it : current.map) {
pid_t pid = it.key;
if (pid == 0)
continue;
dword nsched_now = it.value.nsched;
auto jt = prev.map.find(pid);
if (jt == prev.map.end())
continue;
dword nsched_before = (*jt).value.nsched;
dword nsched_diff = nsched_now - nsched_before;
it.value.nsched_since_prev = nsched_diff;
it.value.cpu_percent = ((nsched_diff * 100)/ sum_diff);
it.value.cpu_percent_decimal = (((nsched_diff * 1000)/ sum_diff) % 10);
processes.append(&it.value);
}
quick_sort(processes.begin(), processes.end(), [] (auto* p1, auto* p2) {
return p2->nsched_since_prev < p1->nsched_since_prev;
});
for (auto* process : processes) {
printf("%6d %c % 8s % 8s %6u %6u %2u.%1u %s\n",
process->pid,
process->priority[0],
process->user.characters(),
process->state.characters(),
process->linear / 1024,
process->committed / 1024,
process->cpu_percent,
process->cpu_percent_decimal,
process->name.characters()
);
}
processes.clear_with_capacity();
prev = move(current);
sleep(1);
}
return 0;
}
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