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/*
* Copyright (c) 2017, Arnon Yaari
* All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include <Python.h>
#include <sys/core.h>
#include <stdlib.h>
#include "common.h"
/* psutil_kread() - read from kernel memory */
int
psutil_kread(
int Kd, /* kernel memory file descriptor */
KA_T addr, /* kernel memory address */
char *buf, /* buffer to receive data */
size_t len) { /* length to read */
int br;
if (lseek64(Kd, (off64_t)addr, L_SET) == (off64_t)-1) {
PyErr_SetFromErrno(PyExc_OSError);
return 1;
}
br = read(Kd, buf, len);
if (br == -1) {
PyErr_SetFromErrno(PyExc_OSError);
return 1;
}
if (br != len) {
PyErr_SetString(PyExc_RuntimeError,
"size mismatch when reading kernel memory fd");
return 1;
}
return 0;
}
struct procentry64 *
psutil_read_process_table(int * num) {
size_t msz;
pid32_t pid = 0;
struct procentry64 *processes = (struct procentry64 *)NULL;
struct procentry64 *p;
int Np = 0; /* number of processes allocated in 'processes' */
int np = 0; /* number of processes read into 'processes' */
int i; /* number of processes read in current iteration */
msz = (size_t)(PROCSIZE * PROCINFO_INCR);
processes = (struct procentry64 *)malloc(msz);
if (!processes) {
PyErr_NoMemory();
return NULL;
}
Np = PROCINFO_INCR;
p = processes;
while ((i = getprocs64(p, PROCSIZE, (struct fdsinfo64 *)NULL, 0, &pid,
PROCINFO_INCR))
== PROCINFO_INCR) {
np += PROCINFO_INCR;
if (np >= Np) {
msz = (size_t)(PROCSIZE * (Np + PROCINFO_INCR));
processes = (struct procentry64 *)realloc((char *)processes, msz);
if (!processes) {
PyErr_NoMemory();
return NULL;
}
Np += PROCINFO_INCR;
}
p = (struct procentry64 *)((char *)processes + (np * PROCSIZE));
}
/* add the number of processes read in the last iteration */
if (i > 0)
np += i;
*num = np;
return processes;
}
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