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/**
*
* cpulimit - a CPU limiter for Linux
*
* Copyright (C) 2005-2012, by: Angelo Marletta <angelo dot marletta at gmail dot com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <fcntl.h>
#include <paths.h>
int init_process_iterator(struct process_iterator *it, struct process_filter *filter) {
char errbuf[_POSIX2_LINE_MAX];
it->i = 0;
/* Open the kvm interface, get a descriptor */
if ((it->kd = kvm_openfiles(NULL, NULL, NULL, KVM_NO_FILES, errbuf)) == NULL) {
fprintf(stderr, "kvm_open: %s\n", errbuf);
return -1;
}
/* Get the list of processes. */
if ((it->procs = kvm_getprocs(it->kd, KERN_PROC_ALL, 0, sizeof(struct kinfo_proc), &it->count)) == NULL) {
kvm_close(it->kd);
// fprintf(stderr, "kvm_getprocs: %s\n", kvm_geterr(it->kd));
return -1;
}
it->filter = filter;
return 0;
}
static int kproc2proc(kvm_t *kd, struct kinfo_proc *kproc, struct process *proc) {
proc->pid = kproc->p_pid;
proc->ppid = kproc->p_ppid;
proc->cputime = ( kproc->p_uutime_sec + kproc->p_ustime_sec ) / 1000000 ;
proc->starttime = kproc->p_ustart_sec;
char **args = kvm_getargv(kd, kproc, sizeof(proc->command));
if (args == NULL) return -1;
memcpy(proc->command, args[0], strlen(args[0]) + 1);
return 0;
}
static int get_single_process(kvm_t *kd, pid_t pid, struct process *process)
{
int count;
struct kinfo_proc *kproc = kvm_getprocs(kd, KERN_PROC_PID, pid, sizeof(struct kinfo_proc), &count);
if (count == 0 || kproc == NULL)
{
// fprintf(stderr, "kvm_getprocs: %s\n", kvm_geterr(kd));
return -1;
}
kproc2proc(kd, kproc, process);
return 0;
}
int get_next_process(struct process_iterator *it, struct process *p) {
if (it->i == it->count)
{
return -1;
}
if (it->filter->pid != 0 && !it->filter->include_children)
{
if (get_single_process(it->kd, it->filter->pid, p) != 0)
{
it->i = it->count = 0;
return -1;
}
it->i = it->count = 1;
return 0;
}
while (it->i < it->count)
{
struct kinfo_proc *kproc = &(it->procs[it->i]);
if (kproc->p_flag & P_SYSTEM)
{
// skip system processes
it->i++;
continue;
}
if (it->filter->pid != 0 && it->filter->include_children)
{
kproc2proc(it->kd, kproc, p);
it->i++;
if (p->pid != it->filter->pid && p->ppid != it->filter->pid)
continue;
return 0;
}
else if (it->filter->pid == 0)
{
kproc2proc(it->kd, kproc, p);
it->i++;
return 0;
}
}
return -1;
}
int close_process_iterator(struct process_iterator *it) {
if (kvm_close(it->kd) == -1) {
fprintf(stderr, "kvm_getprocs: %s\n", kvm_geterr(it->kd));
return -1;
}
return 0;
}
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