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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 <errno.h>
#include <stdio.h>
#include <libproc.h>
int init_process_iterator(struct process_iterator *it, struct process_filter *filter) {
it->i = 0;
/* Find out how much to allocate for it->pidlist */
if ((it->count = proc_listpids(PROC_ALL_PIDS, 0, NULL, 0)) <= 0) {
fprintf(stderr, "proc_listpids: %s\n", strerror(errno));
return -1;
}
/* Allocate and populate it->pidlist */
if ((it->pidlist = (int *)malloc((it->count)*sizeof(int))) == NULL) {
fprintf(stderr, "malloc: %s\n", strerror(errno));
}
if ((it->count = proc_listpids(PROC_ALL_PIDS, 0, it->pidlist, it->count)) <= 0) {
fprintf(stderr, "proc_listpids: %s\n", strerror(errno));
return -1;
}
it->filter = filter;
return 0;
}
static int pti2proc(struct proc_taskallinfo *ti, struct process *process) {
int bytes;
process->pid = ti->pbsd.pbi_pid;
process->ppid = ti->pbsd.pbi_ppid;
process->starttime = ti->pbsd.pbi_start_tvsec;
process->cputime = (ti->ptinfo.pti_total_user + ti->ptinfo.pti_total_system) / 1000000;
bytes = strlen(ti->pbsd.pbi_comm);
memcpy(process->command, ti->pbsd.pbi_comm, (bytes < PATH_MAX ? bytes : PATH_MAX) + 1);
return 0;
}
static int get_process_pti(pid_t pid, struct proc_taskallinfo *ti) {
int bytes;
bytes = proc_pidinfo(pid, PROC_PIDTASKALLINFO, 0, ti, sizeof(*ti));
if (bytes <= 0) {
if (!(errno & (EPERM | ESRCH))) {
fprintf(stderr, "proc_pidinfo: %s\n", strerror(errno));
}
return -1;
} else if (bytes < sizeof(ti)) {
fprintf(stderr, "proc_pidinfo: too few bytes; expected %ld, got %d\n", sizeof(ti), bytes);
return -1;
}
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) {
struct proc_taskallinfo ti;
if (get_process_pti(it->filter->pid, &ti) != 0) {
it->i = it->count = 0;
return -1;
}
it->i = it->count = 1;
return pti2proc(&ti, p);
}
while (it->i < it->count) {
struct proc_taskallinfo ti;
get_process_pti(it->pidlist[it->i], &ti);
if (ti.pbsd.pbi_flags & PROC_FLAG_SYSTEM) {
it->i++;
continue;
}
if (it->filter->pid != 0 && it->filter->include_children) {
pti2proc(&ti, p);
it->i++;
if (p->pid != it->filter->pid && p->ppid != it->filter->pid)
continue;
return 0;
}
else if (it->filter->pid == 0)
{
pti2proc(&ti, p);
it->i++;
return 0;
}
}
return -1;
}
int close_process_iterator(struct process_iterator *it) {
free(it->pidlist);
it->pidlist = NULL;
it->filter = NULL;
it->count = 0;
it->i = 0;
return 0;
}
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