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/**
* Copyright (C) 2010 Steven Barth <steven@midlink.org>
* Copyright (C) 2013 John Crispin <blogic@openwrt.org>
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
*
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <stdint.h>
#include <ctype.h>
#include <fcntl.h>
#include <regex.h>
#include <stdio.h>
#include <string.h>
#include <glob.h>
#include <libgen.h>
#include "procd.h"
static regex_t pat_vmsize, pat_ppid, pat_state, pat_uid;
static void __attribute__((constructor)) measure_init() {
regcomp(&pat_vmsize, "VmSize:[ \t]*([0-9]*) kB", REG_EXTENDED);
regcomp(&pat_uid, "Uid:[ \t]*([0-9]*).*", REG_EXTENDED);
regcomp(&pat_ppid, "PPid:[ \t]*([0-9]+)", REG_EXTENDED);
regcomp(&pat_state, "State:[ \t]*([A-Z])", REG_EXTENDED);
}
static void __attribute__((destructor)) measure_fini() {
regfree(&pat_vmsize);
regfree(&pat_ppid);
regfree(&pat_uid);
regfree(&pat_state);
}
int measure_process(pid_t pid, struct pid_info *pi) {
int fd;
char buffer[512] = "";
ssize_t rxed;
regmatch_t matches[2];
glob_t gl;
int i;
memset(pi, 0, sizeof(*pi));
snprintf(buffer, sizeof(buffer), "/proc/%i/fd/*", (int)pid);
if (glob(buffer, GLOB_NOESCAPE | GLOB_MARK, NULL, &gl)) {
fprintf(stderr, "glob failed on %s\n", buffer);
return -1;
}
for (i = 0; i < gl.gl_pathc; i++)
if (isdigit(basename(gl.gl_pathv[i])[0]))
pi->fdcount++;
globfree(&gl);
snprintf(buffer, sizeof(buffer), "/proc/%i/status", (int)pid);
fd = open(buffer, O_RDONLY);
if (fd == -1)
return -1;
rxed = read(fd, buffer, sizeof(buffer) - 1);
close(fd);
if (rxed == -1)
return -1;
buffer[rxed] = 0;
if (!regexec(&pat_state, buffer, 2, matches, 0))
pi->stat = buffer[matches[1].rm_so];
if (!regexec(&pat_ppid, buffer, 2, matches, 0))
pi->ppid = atoi(buffer + matches[1].rm_so);
if (!regexec(&pat_uid, buffer, 2, matches, 0))
pi->uid = atoi(buffer + matches[1].rm_so);
if (!regexec(&pat_vmsize, buffer, 2, matches, 0))
pi->vmsize = atoi(buffer + matches[1].rm_so) * 1024;
return 0;
}
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