// SPDX-License-Identifier: GPL-2.0
/* procacct.c
*
* Demonstrator of fetching resource data on task exit, as a way
* to accumulate accurate program resource usage statistics, without
* prior identification of the programs. For that, the fields for
* device and inode of the program executable binary file are also
* extracted in addition to the command string.
*
* The TGID together with the PID and the AGROUP flag allow
* identification of threads in a process and single-threaded processes.
* The ac_tgetime field gives proper whole-process walltime.
*
* Written (changed) by Thomas Orgis, University of Hamburg in 2022
*
* This is a cheap derivation (inheriting the style) of getdelays.c:
*
* Utility to get per-pid and per-tgid delay accounting statistics
* Also illustrates usage of the taskstats interface
*
* Copyright (C) Shailabh Nagar, IBM Corp. 2005
* Copyright (C) Balbir Singh, IBM Corp. 2006
* Copyright (c) Jay Lan, SGI. 2006
*/
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <poll.h>
#include <string.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <signal.h>
#include <linux/genetlink.h>
#include <linux/acct.h>
#include <linux/taskstats.h>
#include <linux/kdev_t.h>
/*
* Generic macros for dealing with netlink sockets. Might be duplicated
* elsewhere. It is recommended that commercial grade applications use
* libnl or libnetlink and use the interfaces provided by the library
*/
#define GENLMSG_DATA(glh) ((void *)(NLMSG_DATA(glh) + GENL_HDRLEN))
#define GENLMSG_PAYLOAD(glh) (NLMSG_PAYLOAD(glh, 0) - GENL_HDRLEN)
#define NLA_DATA(na) ((void *)((char *)(na) + NLA_HDRLEN))
#define NLA_PAYLOAD(len) (len - NLA_HDRLEN)
#define err(code, fmt, arg...) \
do { \
fprintf(stderr, fmt, ##arg); \
exit(code); \
} while (0)
int rcvbufsz;
char name[100];
int dbg;
int print_delays;
int print_io_accounting;
int print_task_context_switch_counts;
#define PRINTF(fmt, arg...) { \
if (dbg) { \
printf(fmt, ##arg); \
} \
}
/* Maximum size of response requested or message sent */
#define MAX_MSG_SIZE 1024
/* Maximum number of cpus expected to be specified in a cpumask */
#define MAX_CPUS 32
struct msgtemplate {
struct nlmsghdr n;
struct genlmsghdr g;
char buf[MAX_MSG_SIZE];
};
char cpumask[100+6*MAX_CPUS];
static void usage(void)
{
fprintf(stderr, "procacct [-v] [-w logfile] [-r bufsize] [-m cpumask]\n");
fprintf(stderr, " -v: debug on\n");
}
/*
* Create a raw netlink socket and bind
*/
static int create_nl_socket(int protocol)
{
int fd;
struct sockaddr_nl local;
fd = socket(AF_NETLINK, SOCK_RAW, protocol);
if (fd < 0)
return -1;
if (rcvbufsz)
if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF,
&rcvbufsz, sizeof(rcvbufsz)) < 0) {
fprintf(stderr, "Unable to set socket rcv buf size to %d\n",
rcvbufsz);
goto error;
}
memset(&local, 0, sizeof(local));
local.nl_family = AF_NETLINK;
if (bind(fd, (struct sockaddr *) &local, sizeof(local)) < 0)
goto error;
return fd;
error:
close(fd);
return -1;
}
static int send_cmd(int sd, __u16 nlmsg_type, __u32 nlmsg_pid,
__u8 genl_cmd, __u16 nla_type,
void *nla_data, int nla_len)
{
struct nlattr *na;
struct sockaddr_nl nladdr;
int r, buflen;
char *buf;
struct msgtemplate msg;
msg.n.nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN);
msg.n.nlmsg_type = nlmsg_type;
msg.n.nlmsg_flags = NLM_F_REQUEST;
msg.n.nlmsg_seq = 0;
msg.n.nlmsg_pid = nlmsg_pid;
msg.g.cmd = genl_cmd;
msg.g.version = 0x1;
na = (struct nlattr *) GENLMSG_DATA(&msg);
na->nla_type = nla_type;
na->nla_len = nla_len + 1 + NLA_HDRLEN;
memcpy(NLA_DATA(na), nla_data, nla_len);
msg.n.nlmsg_len += NLMSG_ALIGN(na->nla_len);
buf = (char *) &msg;
buflen = msg.n.nlmsg_len;
memset(&nladdr, 0, sizeof(nladdr));
nladdr.nl_family = AF_NETLINK;
while ((r = sendto(sd, buf, buflen, 0, (struct sockaddr *) &nladdr,
sizeof(nladdr))) < buflen) {
if (r > 0) {
buf += r;
buflen -= r;
} else if (errno != EAGAIN)
return -1;
}
return 0;
}
/*
* Probe the controller in genetlink to find the family id
* for the TASKSTATS family
*/
static int get_family_id(int sd)
{
struct {
struct nlmsghdr n;
struct genlmsghdr g;
char buf[256];
} ans;
int id = 0, rc;
struct nlattr *na;
int rep_len;
strcpy(name, TASKSTATS_GENL_NAME);
rc = send_cmd(sd, GENL_ID_CTRL, getpid(), CTRL_CMD_GETFAMILY,
CTRL_ATTR_FAMILY_NAME, (void *)name,
strlen(TASKSTATS_GENL_NAME)+1);
if (rc < 0)
return 0; /* sendto() failure? */
rep_len = recv(sd, &ans, sizeof(ans), 0);
if (ans.n.nlmsg_type == NLMSG_ERROR ||
(rep_len < 0) || !NLMSG_OK((&ans.n), rep_len))
return 0;
na = (struct nlattr *) GENLMSG_DATA(&ans);
na = (struct nlattr *) ((char *) na + NLA_ALIGN(na->nla_len));
if (na->nla_type == CTRL_ATTR_FAMILY_ID)
id = *(__u16 *) NLA_DATA(na);
return id;
}
#define average_ms(t, c) (t / 1000000ULL / (c ? c : 1))
static void print_procacct(struct taskstats *t)
{
/* First letter: T is a mere thread, G the last in a group, U unknown. */
printf(
"%c pid=%lu tgid=%lu uid=%lu wall=%llu gwall=%llu cpu=%llu vmpeak=%llu rsspeak=%llu dev=%lu:%lu inode=%llu comm=%s\n"
, t->version >= 12 ? (t->ac_flag & AGROUP ? 'P' : 'T') : '?'
, (unsigned long)t->ac_pid
, (unsigned long)(t->version >= 12 ? t->ac_tgid : 0)
, (unsigned long)t->ac_uid
, (unsigned long long)t->ac_etime
, (unsigned long long)(t->version >= 12 ? t->ac_tgetime : 0)
, (unsigned long long)(t->ac_utime+t->ac_stime)
, (unsigned long long)t->hiwater_vm
, (unsigned long long)t->hiwater_rss
, (unsigned long)(t->version >= 12 ? MAJOR(t->ac_exe_dev) : 0)
, (unsigned long)(t->version >= 12 ? MINOR(t->ac_exe_dev) : 0)
, (unsigned long long)(t->version >= 12 ? t->ac_exe_inode : 0)
, t->ac_comm
);
}
void handle_aggr(int mother, struct nlattr *na, int fd)
{
int aggr_len = NLA_PAYLOAD(na->nla_len);
int len2 = 0;
pid_t rtid = 0;
na = (struct nlattr *) NLA_DATA(na);
while (len2 < aggr_len) {
switch (na->nla_type) {
case TASKSTATS_TYPE_PID:
rtid = *(int *) NLA_DATA(na);
PRINTF("PID\t%d\n", rtid);
break;
case TASKSTATS_TYPE_TGID:
rtid = *(int *) NLA_DATA(na);
PRINTF("TGID\t%d\n", rtid);
break;
case TASKSTATS_TYPE_STATS:
if (mother == TASKSTATS_TYPE_AGGR_PID)
print_procacct((struct taskstats *) NLA_DATA(na));
if (fd) {
if (write(fd, NLA_DATA(na), na->nla_len) < 0)
err(1, "write error\n");
}
break;
case TASKSTATS_TYPE_NULL:
break;
default:
fprintf(stderr, "Unknown nested nla_type %d\n",
na->nla_type);
break;
}
len2 += NLA_ALIGN(na->nla_len);
na = (struct nlattr *)((char *)na +
NLA_ALIGN(na->nla_len));
}
}
int main(int argc, char *argv[])
{
int c, rc, rep_len;
__u16 id;
__u32 mypid;
struct nlattr *na;
int nl_sd = -1;
int len = 0;
int fd = 0;
int write_file = 0;
int maskset = 0;
char *logfile = NULL;
int cfd = 0;
int forking = 0;
struct msgtemplate msg;
while (!forking) {
c = getopt(argc, argv, "m:vr:");
if (c < 0)
break;
switch (c) {
case 'w':
logfile = strdup(optarg);
printf("write to file %s\n", logfile);
write_file = 1;
break;
case 'r':
rcvbufsz = atoi(optarg);
printf("receive buf size %d\n", rcvbufsz);
if (rcvbufsz < 0)
err(1, "Invalid rcv buf size\n");
break;
case 'm':
strncpy(cpumask, optarg, sizeof(cpumask));
cpumask[sizeof(cpumask) - 1] = '\0';
maskset = 1;
break;
case 'v':
printf("debug on\n");
dbg = 1;
break;
default:
usage();
exit(-1);
}
}
if (!maskset) {
maskset = 1;
strncpy(cpumask, "1", sizeof(cpumask));
cpumask[sizeof(cpumask) - 1] = '\0';
}
printf("cpumask %s maskset %d\n", cpumask, maskset);
if (write_file) {
fd = open(logfile, O_WRONLY | O_CREAT | O_TRUNC, 0644);
if (fd == -1) {
perror("Cannot open output file\n");
exit(1);
}
}
nl_sd = create_nl_socket(NETLINK_GENERIC);
if (nl_sd < 0)
err(1, "error creating Netlink socket\n");
mypid = getpid();
id = get_family_id(nl_sd);
if (!id) {
fprintf(stderr, "Error getting family id, errno %d\n", errno);
goto err;
}
PRINTF("family id %d\n", id);
if (maskset) {
rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
TASKSTATS_CMD_ATTR_REGISTER_CPUMASK,
&cpumask, strlen(cpumask) + 1);
PRINTF("Sent register cpumask, retval %d\n", rc);
if (rc < 0) {
fprintf(stderr, "error sending register cpumask\n");
goto err;
}
}
do {
rep_len = recv(nl_sd, &msg, sizeof(msg), 0);
PRINTF("received %d bytes\n", rep_len);
if (rep_len < 0) {
fprintf(stderr, "nonfatal reply error: errno %d\n",
errno);
continue;
}
if (msg.n.nlmsg_type == NLMSG_ERROR ||
!NLMSG_OK((&msg.n), rep_len)) {
struct nlmsgerr *err = NLMSG_DATA(&msg);
fprintf(stderr, "fatal reply error, errno %d\n",
err->error);
goto done;
}
PRINTF("nlmsghdr size=%zu, nlmsg_len=%d, rep_len=%d\n",
sizeof(struct nlmsghdr), msg.n.nlmsg_len, rep_len);
rep_len = GENLMSG_PAYLOAD(&msg.n);
na = (struct nlattr *) GENLMSG_DATA(&msg);
len = 0;
while (len < rep_len) {
len += NLA_ALIGN(na->nla_len);
int mother = na->nla_type;
PRINTF("mother=%i\n", mother);
switch (na->nla_type) {
case TASKSTATS_TYPE_AGGR_PID:
case TASKSTATS_TYPE_AGGR_TGID:
/* For nested attributes, na follows */
handle_aggr(mother, na, fd);
break;
default:
fprintf(stderr, "Unexpected nla_type %d\n",
na->nla_type);
case TASKSTATS_TYPE_NULL:
break;
}
na = (struct nlattr *) (GENLMSG_DATA(&msg) + len);
}
} while (1);
done:
if (maskset) {
rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK,
&cpumask, strlen(cpumask) + 1);
printf("Sent deregister mask, retval %d\n", rc);
if (rc < 0)
err(rc, "error sending deregister cpumask\n");
}
err:
close(nl_sd);
if (fd)
close(fd);
if (cfd)
close(cfd);
return 0;
}
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