From 8555851160bcc5a04acfa8837af0977b82f7b500 Mon Sep 17 00:00:00 2001 From: John Crispin Date: Tue, 27 Aug 2013 14:50:45 +0200 Subject: add suport for measuring process resource usage Signed-off-by: John Crispin --- measure.c | 99 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 99 insertions(+) create mode 100644 measure.c (limited to 'measure.c') diff --git a/measure.c b/measure.c new file mode 100644 index 0000000..9e21a66 --- /dev/null +++ b/measure.c @@ -0,0 +1,99 @@ +/** + * Copyright (C) 2010 Steven Barth + * Copyright (C) 2013 John Crispin + * + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#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; +} -- cgit v1.2.3