int amode_delete(AE_MODE ae_mode) {
char filenames[2][FILENAME_LENGTH];
get_amode_filenames(filenames, ae_mode);
return snapshot_delete(filenames);
}
int cmode_delete(int id) {
char filenames[2][FILENAME_LENGTH];
get_cmode_filenames(filenames, id);
return snapshot_delete(filenames);
}
//removes a snapshot with the given id from the list
snapshot* drop(snapshot *snapHead, int id) {
snapshot *unwantedSnap = get_snapshot(snapHead, id);
if (unwantedSnap == NULL) {
printf("no such snapshot\n");
return snapHead;
}
else {
printf("ok\n");
return snapshot_delete(snapHead, unwantedSnap);
}
}
void cpu_snapshot_tick(cpu_snapshot *cpu) {
snapshot *snap = 0;
if (snapshot_create("/proc/stat", &snap) < 0) {
fprintf(stderr, "Failed to save /proc/stat.\n");
snapshot_delete(snap);
return;
}
char const *data = snap->data;
char buf[32];
while (data) {
uint64_t t1;
column(data, 0, buf, 32);
/* save the total number of jiffies spent in cpu user+system time */
if (equal(buf, "cpu")) {
cpu_save_snapshot_to_history(data, snap->time, cpu->main);
} else if (startswith(buf, "cpu")) {
int cpu_num = atoi(buf+3);
cpu_save_snapshot_to_history(data, snap->time, cpu->cpus[cpu_num]);
}
/* save the number of context switches */
if (equal(buf, "ctxt")) {
column(data, 1, buf, 32);
t1 = strtoull(buf, 0, 10);
history_append(cpu->ctxt, snap->time, t1);
}
data = next_line(data);
}
snapshot_delete(snap);
}
//removes all snapshots from the list that were taken after the one with the given id
snapshot* remove_snapshots(int id, snapshot *snapHead) {
snapshot *chosenSnap = get_snapshot(snapHead, id);
snapshot *newSnapHead = snapHead;
if (chosenSnap == NULL) {
return newSnapHead;
}
chosenSnap = chosenSnap->prev;
while (chosenSnap != NULL) {
snapshot *temp = chosenSnap->prev;
newSnapHead = snapshot_delete(newSnapHead, chosenSnap);
chosenSnap = temp;
}
return newSnapHead;
}
