add suport for measuring process resource usage

Signed-off-by: John Crispin <blogic@openwrt.org>

4 files changed, 123 insertions, 1 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index b174a15..b7b0808 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -10,7 +10,7 @@ IF(APPLE)
   LINK_DIRECTORIES(/opt/local/lib)
 ENDIF()
 
-SET(SOURCES main.c ubus.c service.c instance.c utils.c md5.c hotplug.c state.c mkdev.c early.c inittab.c preinit.c coldplug.c syslog.c log.c watchdog.c signal.c system.c debug.c rcS.c trigger.c)
+SET(SOURCES main.c ubus.c service.c instance.c utils.c md5.c hotplug.c state.c mkdev.c early.c inittab.c preinit.c coldplug.c syslog.c log.c watchdog.c signal.c system.c debug.c rcS.c trigger.c measure.c)
 
 find_library(json NAMES json-c json)
 SET(LIBS ubox ubus ${json} blobmsg_json json_script)
diff --git a/instance.c b/instance.c
index d9530e5..45706ba 100644
--- a/instance.c
+++ b/instance.c
@@ -422,6 +422,7 @@ instance_init(struct service_instance *in, struct service *s, struct blob_attr *
 void instance_dump(struct blob_buf *b, struct service_instance *in, int verbose)
 {
 	void *i;
+	struct pid_info pi;
 
 	i = blobmsg_open_table(b, in->name);
 	blobmsg_add_u8(b, "running", in->proc.pending);
@@ -430,5 +431,18 @@ void instance_dump(struct blob_buf *b, struct service_instance *in, int verbose)
 	blobmsg_add_blob(b, in->command);
 	if (verbose && in->trigger)
 		blobmsg_add_blob(b, in->trigger);
+	if (!measure_process(in->proc.pid, &pi)) {
+		struct timespec tp;
+		long uptime;
+
+		clock_gettime(CLOCK_MONOTONIC, &tp);
+		uptime = tp.tv_sec - in->start.tv_sec;
+
+		blobmsg_add_u8(b, "ppid", pi.ppid);
+		blobmsg_add_u16(b, "uid", pi.uid);
+		blobmsg_add_u32(b, "fdcount", pi.fdcount);
+		blobmsg_add_u32(b, "vmsize", pi.vmsize);
+		blobmsg_add_u32(b, "uptime", uptime);
+	}
 	blobmsg_close_table(b, i);
 }
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 <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;
+}
diff --git a/procd.h b/procd.h
index 4fd45f2..f7a333e 100644
--- a/procd.h
+++ b/procd.h
@@ -75,4 +75,13 @@ void trigger_event(char *type, struct blob_attr *data);
 void trigger_add(struct blob_attr *rule, void *id);
 void trigger_del(void *id);
 
+struct pid_info {
+	char stat;
+	uint32_t ppid;
+	uint32_t fdcount;
+	uint32_t vmsize;
+	uint16_t uid;
+};
+int measure_process(pid_t pid, struct pid_info *pi);
+
 #endif