1 // SPDX-License-Identifier: GPL-2.0
2 /* procacct.c
3 *
4 * Demonstrator of fetching resource data on task exit, as a way
5 * to accumulate accurate program resource usage statistics, without
6 * prior identification of the programs. For that, the fields for
7 * device and inode of the program executable binary file are also
8 * extracted in addition to the command string.
9 *
10 * The TGID together with the PID and the AGROUP flag allow
11 * identification of threads in a process and single-threaded processes.
12 * The ac_tgetime field gives proper whole-process walltime.
13 *
14 * Written (changed) by Thomas Orgis, University of Hamburg in 2022
15 *
16 * This is a cheap derivation (inheriting the style) of getdelays.c:
17 *
18 * Utility to get per-pid and per-tgid delay accounting statistics
19 * Also illustrates usage of the taskstats interface
20 *
21 * Copyright (C) Shailabh Nagar, IBM Corp. 2005
22 * Copyright (C) Balbir Singh, IBM Corp. 2006
23 * Copyright (c) Jay Lan, SGI. 2006
24 */
25
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <errno.h>
29 #include <unistd.h>
30 #include <poll.h>
31 #include <string.h>
32 #include <fcntl.h>
33 #include <sys/types.h>
34 #include <sys/stat.h>
35 #include <sys/socket.h>
36 #include <sys/wait.h>
37 #include <signal.h>
38
39 #include <linux/genetlink.h>
40 #include <linux/acct.h>
41 #include <linux/taskstats.h>
42 #include <linux/kdev_t.h>
43
44 /*
45 * Generic macros for dealing with netlink sockets. Might be duplicated
46 * elsewhere. It is recommended that commercial grade applications use
47 * libnl or libnetlink and use the interfaces provided by the library
48 */
49 #define GENLMSG_DATA(glh) ((void *)(NLMSG_DATA(glh) + GENL_HDRLEN))
50 #define GENLMSG_PAYLOAD(glh) (NLMSG_PAYLOAD(glh, 0) - GENL_HDRLEN)
51 #define NLA_DATA(na) ((void *)((char *)(na) + NLA_HDRLEN))
52 #define NLA_PAYLOAD(len) (len - NLA_HDRLEN)
53
54 #define err(code, fmt, arg...) \
55 do { \
56 fprintf(stderr, fmt, ##arg); \
57 exit(code); \
58 } while (0)
59
60 int rcvbufsz;
61 char name[100];
62 int dbg;
63 int print_delays;
64 int print_io_accounting;
65 int print_task_context_switch_counts;
66
67 #define PRINTF(fmt, arg...) { \
68 if (dbg) { \
69 printf(fmt, ##arg); \
70 } \
71 }
72
73 /* Maximum size of response requested or message sent */
74 #define MAX_MSG_SIZE 1024
75 /* Maximum number of cpus expected to be specified in a cpumask */
76 #define MAX_CPUS 32
77
78 struct msgtemplate {
79 struct nlmsghdr n;
80 struct genlmsghdr g;
81 char buf[MAX_MSG_SIZE];
82 };
83
84 char cpumask[100+6*MAX_CPUS];
85
86 static void usage(void)
87 {
88 fprintf(stderr, "procacct [-v] [-w logfile] [-r bufsize] [-m cpumask]\n");
89 fprintf(stderr, " -v: debug on\n");
90 }
91
92 /*
93 * Create a raw netlink socket and bind
94 */
95 static int create_nl_socket(int protocol)
96 {
97 int fd;
98 struct sockaddr_nl local;
99
100 fd = socket(AF_NETLINK, SOCK_RAW, protocol);
101 if (fd < 0)
102 return -1;
103
104 if (rcvbufsz)
105 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF,
106 &rcvbufsz, sizeof(rcvbufsz)) < 0) {
107 fprintf(stderr, "Unable to set socket rcv buf size to %d\n",
108 rcvbufsz);
109 goto error;
110 }
111
112 memset(&local, 0, sizeof(local));
113 local.nl_family = AF_NETLINK;
114
115 if (bind(fd, (struct sockaddr *) &local, sizeof(local)) < 0)
116 goto error;
117
118 return fd;
119 error:
120 close(fd);
121 return -1;
122 }
123
124
125 static int send_cmd(int sd, __u16 nlmsg_type, __u32 nlmsg_pid,
126 __u8 genl_cmd, __u16 nla_type,
127 void *nla_data, int nla_len)
128 {
129 struct nlattr *na;
130 struct sockaddr_nl nladdr;
131 int r, buflen;
132 char *buf;
133
134 struct msgtemplate msg;
135
136 msg.n.nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN);
137 msg.n.nlmsg_type = nlmsg_type;
138 msg.n.nlmsg_flags = NLM_F_REQUEST;
139 msg.n.nlmsg_seq = 0;
140 msg.n.nlmsg_pid = nlmsg_pid;
141 msg.g.cmd = genl_cmd;
142 msg.g.version = 0x1;
143 na = (struct nlattr *) GENLMSG_DATA(&msg);
144 na->nla_type = nla_type;
145 na->nla_len = nla_len + 1 + NLA_HDRLEN;
146 memcpy(NLA_DATA(na), nla_data, nla_len);
147 msg.n.nlmsg_len += NLMSG_ALIGN(na->nla_len);
148
149 buf = (char *) &msg;
150 buflen = msg.n.nlmsg_len;
151 memset(&nladdr, 0, sizeof(nladdr));
152 nladdr.nl_family = AF_NETLINK;
153 while ((r = sendto(sd, buf, buflen, 0, (struct sockaddr *) &nladdr,
154 sizeof(nladdr))) < buflen) {
155 if (r > 0) {
156 buf += r;
157 buflen -= r;
158 } else if (errno != EAGAIN)
159 return -1;
160 }
161 return 0;
162 }
163
164
165 /*
166 * Probe the controller in genetlink to find the family id
167 * for the TASKSTATS family
168 */
169 static int get_family_id(int sd)
170 {
171 struct {
172 struct nlmsghdr n;
173 struct genlmsghdr g;
174 char buf[256];
175 } ans;
176
177 int id = 0, rc;
178 struct nlattr *na;
179 int rep_len;
180
181 strcpy(name, TASKSTATS_GENL_NAME);
182 rc = send_cmd(sd, GENL_ID_CTRL, getpid(), CTRL_CMD_GETFAMILY,
183 CTRL_ATTR_FAMILY_NAME, (void *)name,
184 strlen(TASKSTATS_GENL_NAME)+1);
185 if (rc < 0)
186 return 0; /* sendto() failure? */
187
188 rep_len = recv(sd, &ans, sizeof(ans), 0);
189 if (ans.n.nlmsg_type == NLMSG_ERROR ||
190 (rep_len < 0) || !NLMSG_OK((&ans.n), rep_len))
191 return 0;
192
193 na = (struct nlattr *) GENLMSG_DATA(&ans);
194 na = (struct nlattr *) ((char *) na + NLA_ALIGN(na->nla_len));
195 if (na->nla_type == CTRL_ATTR_FAMILY_ID)
196 id = *(__u16 *) NLA_DATA(na);
197
198 return id;
199 }
200
201 #define average_ms(t, c) (t / 1000000ULL / (c ? c : 1))
202
203 static void print_procacct(struct taskstats *t)
204 {
205 /* First letter: T is a mere thread, G the last in a group, U unknown. */
206 printf(
207 "%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"
208 , t->version >= 12 ? (t->ac_flag & AGROUP ? 'P' : 'T') : '?'
209 , (unsigned long)t->ac_pid
210 , (unsigned long)(t->version >= 12 ? t->ac_tgid : 0)
211 , (unsigned long)t->ac_uid
212 , (unsigned long long)t->ac_etime
213 , (unsigned long long)(t->version >= 12 ? t->ac_tgetime : 0)
214 , (unsigned long long)(t->ac_utime+t->ac_stime)
215 , (unsigned long long)t->hiwater_vm
216 , (unsigned long long)t->hiwater_rss
217 , (unsigned long)(t->version >= 12 ? MAJOR(t->ac_exe_dev) : 0)
218 , (unsigned long)(t->version >= 12 ? MINOR(t->ac_exe_dev) : 0)
219 , (unsigned long long)(t->version >= 12 ? t->ac_exe_inode : 0)
220 , t->ac_comm
221 );
222 }
223
224 void handle_aggr(int mother, struct nlattr *na, int fd)
225 {
226 int aggr_len = NLA_PAYLOAD(na->nla_len);
227 int len2 = 0;
228 pid_t rtid = 0;
229
230 na = (struct nlattr *) NLA_DATA(na);
231 while (len2 < aggr_len) {
232 switch (na->nla_type) {
233 case TASKSTATS_TYPE_PID:
234 rtid = *(int *) NLA_DATA(na);
235 PRINTF("PID\t%d\n", rtid);
236 break;
237 case TASKSTATS_TYPE_TGID:
238 rtid = *(int *) NLA_DATA(na);
239 PRINTF("TGID\t%d\n", rtid);
240 break;
241 case TASKSTATS_TYPE_STATS:
242 if (mother == TASKSTATS_TYPE_AGGR_PID)
243 print_procacct((struct taskstats *) NLA_DATA(na));
244 if (fd) {
245 if (write(fd, NLA_DATA(na), na->nla_len) < 0)
246 err(1, "write error\n");
247 }
248 break;
249 case TASKSTATS_TYPE_NULL:
250 break;
251 default:
252 fprintf(stderr, "Unknown nested nla_type %d\n",
253 na->nla_type);
254 break;
255 }
256 len2 += NLA_ALIGN(na->nla_len);
257 na = (struct nlattr *)((char *)na +
258 NLA_ALIGN(na->nla_len));
259 }
260 }
261
262 int main(int argc, char *argv[])
263 {
264 int c, rc, rep_len;
265 __u16 id;
266 __u32 mypid;
267
268 struct nlattr *na;
269 int nl_sd = -1;
270 int len = 0;
271
272 int fd = 0;
273 int write_file = 0;
274 int maskset = 0;
275 char *logfile = NULL;
276 int cfd = 0;
277 int forking = 0;
278
279 struct msgtemplate msg;
280
281 while (!forking) {
282 c = getopt(argc, argv, "m:vr:");
283 if (c < 0)
284 break;
285
286 switch (c) {
287 case 'w':
288 logfile = strdup(optarg);
289 printf("write to file %s\n", logfile);
290 write_file = 1;
291 break;
292 case 'r':
293 rcvbufsz = atoi(optarg);
294 printf("receive buf size %d\n", rcvbufsz);
295 if (rcvbufsz < 0)
296 err(1, "Invalid rcv buf size\n");
297 break;
298 case 'm':
299 strncpy(cpumask, optarg, sizeof(cpumask));
300 cpumask[sizeof(cpumask) - 1] = '\0';
301 maskset = 1;
302 break;
303 case 'v':
304 printf("debug on\n");
305 dbg = 1;
306 break;
307 default:
308 usage();
309 exit(-1);
310 }
311 }
312 if (!maskset) {
313 maskset = 1;
314 strncpy(cpumask, "1", sizeof(cpumask));
315 cpumask[sizeof(cpumask) - 1] = '\0';
316 }
317 printf("cpumask %s maskset %d\n", cpumask, maskset);
318
319 if (write_file) {
320 fd = open(logfile, O_WRONLY | O_CREAT | O_TRUNC, 0644);
321 if (fd == -1) {
322 perror("Cannot open output file\n");
323 exit(1);
324 }
325 }
326
327 nl_sd = create_nl_socket(NETLINK_GENERIC);
328 if (nl_sd < 0)
329 err(1, "error creating Netlink socket\n");
330
331 mypid = getpid();
332 id = get_family_id(nl_sd);
333 if (!id) {
334 fprintf(stderr, "Error getting family id, errno %d\n", errno);
335 goto err;
336 }
337 PRINTF("family id %d\n", id);
338
339 if (maskset) {
340 rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
341 TASKSTATS_CMD_ATTR_REGISTER_CPUMASK,
342 &cpumask, strlen(cpumask) + 1);
343 PRINTF("Sent register cpumask, retval %d\n", rc);
344 if (rc < 0) {
345 fprintf(stderr, "error sending register cpumask\n");
346 goto err;
347 }
348 }
349
350 do {
351 rep_len = recv(nl_sd, &msg, sizeof(msg), 0);
352 PRINTF("received %d bytes\n", rep_len);
353
354 if (rep_len < 0) {
355 fprintf(stderr, "nonfatal reply error: errno %d\n",
356 errno);
357 continue;
358 }
359 if (msg.n.nlmsg_type == NLMSG_ERROR ||
360 !NLMSG_OK((&msg.n), rep_len)) {
361 struct nlmsgerr *err = NLMSG_DATA(&msg);
362
363 fprintf(stderr, "fatal reply error, errno %d\n",
364 err->error);
365 goto done;
366 }
367
368 PRINTF("nlmsghdr size=%zu, nlmsg_len=%d, rep_len=%d\n",
369 sizeof(struct nlmsghdr), msg.n.nlmsg_len, rep_len);
370
371
372 rep_len = GENLMSG_PAYLOAD(&msg.n);
373
374 na = (struct nlattr *) GENLMSG_DATA(&msg);
375 len = 0;
376 while (len < rep_len) {
377 len += NLA_ALIGN(na->nla_len);
378 int mother = na->nla_type;
379
380 PRINTF("mother=%i\n", mother);
381 switch (na->nla_type) {
382 case TASKSTATS_TYPE_AGGR_PID:
383 case TASKSTATS_TYPE_AGGR_TGID:
384 /* For nested attributes, na follows */
385 handle_aggr(mother, na, fd);
386 break;
387 default:
388 fprintf(stderr, "Unexpected nla_type %d\n",
389 na->nla_type);
390 case TASKSTATS_TYPE_NULL:
391 break;
392 }
393 na = (struct nlattr *) (GENLMSG_DATA(&msg) + len);
394 }
395 } while (1);
396 done:
397 if (maskset) {
398 rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
399 TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK,
400 &cpumask, strlen(cpumask) + 1);
401 printf("Sent deregister mask, retval %d\n", rc);
402 if (rc < 0)
403 err(rc, "error sending deregister cpumask\n");
404 }
405 err:
406 close(nl_sd);
407 if (fd)
408 close(fd);
409 if (cfd)
410 close(cfd);
411 return 0;
412 }
413
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