[linux-block.git] / tools / accounting / procacct.c

// 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, aggr_len, len2;
	int cmd_type = TASKSTATS_CMD_ATTR_UNSPEC;
	__u16 id;
	__u32 mypid;

	struct nlattr *na;
	int nl_sd = -1;
	int len = 0;
	pid_t tid = 0;

	int fd = 0;
	int write_file = 0;
	int maskset = 0;
	char *logfile = NULL;
	int containerset = 0;
	char *containerpath = NULL;
	int cfd = 0;
	int forking = 0;
	sigset_t sigset;

	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;
}
Commit	Line	Data
0e0af57e DTO	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, aggr_len, len2;
265	int cmd_type = TASKSTATS_CMD_ATTR_UNSPEC;
266	__u16 id;
267	__u32 mypid;
268
269	struct nlattr *na;
270	int nl_sd = -1;
271	int len = 0;
272	pid_t tid = 0;
273
274	int fd = 0;
275	int write_file = 0;
276	int maskset = 0;
277	char *logfile = NULL;
278	int containerset = 0;
279	char *containerpath = NULL;
280	int cfd = 0;
281	int forking = 0;
282	sigset_t sigset;
283
284	struct msgtemplate msg;
285
286	while (!forking) {
287	c = getopt(argc, argv, "m:vr:");
288	if (c < 0)
289	break;
290
291	switch (c) {
292	case 'w':
293	logfile = strdup(optarg);
294	printf("write to file %s\n", logfile);
295	write_file = 1;
296	break;
297	case 'r':
298	rcvbufsz = atoi(optarg);
299	printf("receive buf size %d\n", rcvbufsz);
300	if (rcvbufsz < 0)
301	err(1, "Invalid rcv buf size\n");
302	break;
303	case 'm':
304	strncpy(cpumask, optarg, sizeof(cpumask));
305	cpumask[sizeof(cpumask) - 1] = '\0';
306	maskset = 1;
307	break;
308	case 'v':
309	printf("debug on\n");
310	dbg = 1;
311	break;
312	default:
313	usage();
314	exit(-1);
315	}
316	}
317	if (!maskset) {
318	maskset = 1;
319	strncpy(cpumask, "1", sizeof(cpumask));
320	cpumask[sizeof(cpumask) - 1] = '\0';
321	}
322	printf("cpumask %s maskset %d\n", cpumask, maskset);
323
324	if (write_file) {
325	fd = open(logfile, O_WRONLY \| O_CREAT \| O_TRUNC, 0644);
326	if (fd == -1) {
327	perror("Cannot open output file\n");
328	exit(1);
329	}
330	}
331
332	nl_sd = create_nl_socket(NETLINK_GENERIC);
333	if (nl_sd < 0)
334	err(1, "error creating Netlink socket\n");
335
336	mypid = getpid();
337	id = get_family_id(nl_sd);
338	if (!id) {
339	fprintf(stderr, "Error getting family id, errno %d\n", errno);
340	goto err;
341	}
342	PRINTF("family id %d\n", id);
343
344	if (maskset) {
345	rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
346	TASKSTATS_CMD_ATTR_REGISTER_CPUMASK,
347	&cpumask, strlen(cpumask) + 1);
348	PRINTF("Sent register cpumask, retval %d\n", rc);
349	if (rc < 0) {
350	fprintf(stderr, "error sending register cpumask\n");
351	goto err;
352	}
353	}
354
355	do {
356	rep_len = recv(nl_sd, &msg, sizeof(msg), 0);
357	PRINTF("received %d bytes\n", rep_len);
358
359	if (rep_len < 0) {
360	fprintf(stderr, "nonfatal reply error: errno %d\n",
361	errno);
362	continue;
363	}
364	if (msg.n.nlmsg_type == NLMSG_ERROR \|\|
365	!NLMSG_OK((&msg.n), rep_len)) {
366	struct nlmsgerr *err = NLMSG_DATA(&msg);
367
368	fprintf(stderr, "fatal reply error, errno %d\n",
369	err->error);
370	goto done;
371	}
372
373	PRINTF("nlmsghdr size=%zu, nlmsg_len=%d, rep_len=%d\n",
374	sizeof(struct nlmsghdr), msg.n.nlmsg_len, rep_len);
375
376
377	rep_len = GENLMSG_PAYLOAD(&msg.n);
378
379	na = (struct nlattr *) GENLMSG_DATA(&msg);
380	len = 0;
381	while (len < rep_len) {
382	len += NLA_ALIGN(na->nla_len);
383	int mother = na->nla_type;
384
385	PRINTF("mother=%i\n", mother);
386	switch (na->nla_type) {
387	case TASKSTATS_TYPE_AGGR_PID:
388	case TASKSTATS_TYPE_AGGR_TGID:
389	/* For nested attributes, na follows */
390	handle_aggr(mother, na, fd);
391	break;
392	default:
393	fprintf(stderr, "Unexpected nla_type %d\n",
394	na->nla_type);
395	case TASKSTATS_TYPE_NULL:
396	break;
397	}
398	na = (struct nlattr *) (GENLMSG_DATA(&msg) + len);
399	}
400	} while (1);
401	done:
402	if (maskset) {
403	rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
404	TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK,
405	&cpumask, strlen(cpumask) + 1);
406	printf("Sent deregister mask, retval %d\n", rc);
407	if (rc < 0)
408	err(rc, "error sending deregister cpumask\n");
409	}
410	err:
411	close(nl_sd);
412	if (fd)
413	close(fd);
414	if (cfd)
415	close(cfd);
416	return 0;
417	}