2 * Copyright (C) 2010 Steven Barth <steven@midlink.org>
3 * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
22 #include <sys/types.h>
36 static regex_t pat_vmsize, pat_ppid, pat_state, pat_uid;
38 static void __attribute__((constructor)) measure_init() {
39 regcomp(&pat_vmsize, "VmSize:[ \t]*([0-9]*) kB", REG_EXTENDED);
40 regcomp(&pat_uid, "Uid:[ \t]*([0-9]*).*", REG_EXTENDED);
41 regcomp(&pat_ppid, "PPid:[ \t]*([0-9]+)", REG_EXTENDED);
42 regcomp(&pat_state, "State:[ \t]*([A-Z])", REG_EXTENDED);
45 static void __attribute__((destructor)) measure_fini() {
52 int measure_process(pid_t pid, struct pid_info *pi) {
54 char buffer[512] = "";
56 regmatch_t matches[2];
60 memset(pi, 0, sizeof(*pi));
62 snprintf(buffer, sizeof(buffer), "/proc/%i/fd/*", (int)pid);
64 if (glob(buffer, GLOB_NOESCAPE | GLOB_MARK, NULL, &gl)) {
65 fprintf(stderr, "glob failed on %s\n", buffer);
69 for (i = 0; i < gl.gl_pathc; i++)
70 if (isdigit(basename(gl.gl_pathv[i])[0]))
74 snprintf(buffer, sizeof(buffer), "/proc/%i/status", (int)pid);
75 fd = open(buffer, O_RDONLY);
79 rxed = read(fd, buffer, sizeof(buffer) - 1);
86 if (!regexec(&pat_state, buffer, 2, matches, 0))
87 pi->stat = buffer[matches[1].rm_so];
89 if (!regexec(&pat_ppid, buffer, 2, matches, 0))
90 pi->ppid = atoi(buffer + matches[1].rm_so);
92 if (!regexec(&pat_uid, buffer, 2, matches, 0))
93 pi->uid = atoi(buffer + matches[1].rm_so);
95 if (!regexec(&pat_vmsize, buffer, 2, matches, 0))
96 pi->vmsize = atoi(buffer + matches[1].rm_so) * 1024;