[deliverable/linux.git] / Documentation / accounting / getdelays.c

/* 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/types.h>
#include <signal.h>

#include <linux/genetlink.h>
#include <linux/taskstats.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 { printf(fmt, ##arg); exit(code); } while (0)
int done = 0;
int rcvbufsz=0;

    char name[100];
int dbg=0, print_delays=0;
__u64 stime, utime;
#define PRINTF(fmt, arg...) {			\
	    if (dbg) {				\
		printf(fmt, ##arg);		\
	    }					\
	}

/* Maximum size of response requested or message sent */
#define MAX_MSG_SIZE	256
/* Maximum number of cpus expected to be specified in a cpumask */
#define MAX_CPUS	32
/* Maximum length of pathname to log file */
#define MAX_FILENAME	256

struct msgtemplate {
	struct nlmsghdr n;
	struct genlmsghdr g;
	char buf[MAX_MSG_SIZE];
};

char cpumask[100+6*MAX_CPUS];

/*
 * 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) {
			printf("Unable to set socket rcv buf size to %d\n",
			       rcvbufsz);
			return -1;
		}

	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;
}


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
 */
int get_family_id(int sd)
{
	struct {
		struct nlmsghdr n;
		struct genlmsghdr g;
		char buf[256];
	} ans;

	int id, 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);

	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;
}

void print_delayacct(struct taskstats *t)
{
	printf("\n\nCPU   %15s%15s%15s%15s\n"
	       "      %15llu%15llu%15llu%15llu\n"
	       "IO    %15s%15s\n"
	       "      %15llu%15llu\n"
	       "MEM   %15s%15s\n"
	       "      %15llu%15llu\n\n",
	       "count", "real total", "virtual total", "delay total",
	       t->cpu_count, t->cpu_run_real_total, t->cpu_run_virtual_total,
	       t->cpu_delay_total,
	       "count", "delay total",
	       t->blkio_count, t->blkio_delay_total,
	       "count", "delay total", t->swapin_count, t->swapin_delay_total);
}

int main(int argc, char *argv[])
{
	int c, rc, rep_len, aggr_len, len2, cmd_type;
	__u16 id;
	__u32 mypid;

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

	int fd = 0;
	int count = 0;
	int write_file = 0;
	int maskset = 0;
	char logfile[128];
	int loop = 0;

	struct msgtemplate msg;

	while (1) {
		c = getopt(argc, argv, "dw:r:m:t:p:v:l");
		if (c < 0)
			break;

		switch (c) {
		case 'd':
			printf("print delayacct stats ON\n");
			print_delays = 1;
			break;
		case 'w':
			strncpy(logfile, optarg, MAX_FILENAME);
			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));
			maskset = 1;
			printf("cpumask %s maskset %d\n", cpumask, maskset);
			break;
		case 't':
			tid = atoi(optarg);
			if (!tid)
				err(1, "Invalid tgid\n");
			cmd_type = TASKSTATS_CMD_ATTR_TGID;
			print_delays = 1;
			break;
		case 'p':
			tid = atoi(optarg);
			if (!tid)
				err(1, "Invalid pid\n");
			cmd_type = TASKSTATS_CMD_ATTR_PID;
			print_delays = 1;
			break;
		case 'v':
			printf("debug on\n");
			dbg = 1;
			break;
		case 'l':
			printf("listen forever\n");
			loop = 1;
			break;
		default:
			printf("Unknown option %d\n", c);
			exit(-1);
		}
	}

	if (write_file) {
		fd = open(logfile, O_WRONLY | O_CREAT | O_TRUNC,
			  S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
		if (fd == -1) {
			perror("Cannot open output file\n");
			exit(1);
		}
	}

	if ((nl_sd = create_nl_socket(NETLINK_GENERIC)) < 0)
		err(1, "error creating Netlink socket\n");


	mypid = getpid();
	id = get_family_id(nl_sd);
	if (!id) {
		printf("Error getting family id, errno %d", 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, sizeof(cpumask));
		PRINTF("Sent register cpumask, retval %d\n", rc);
		if (rc < 0) {
			printf("error sending register cpumask\n");
			goto err;
		}
	}

	if (tid) {
		rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
			      cmd_type, &tid, sizeof(__u32));
		PRINTF("Sent pid/tgid, retval %d\n", rc);
		if (rc < 0) {
			printf("error sending tid/tgid cmd\n");
			goto done;
		}
	}

	do {
		int i;

		rep_len = recv(nl_sd, &msg, sizeof(msg), 0);
		PRINTF("received %d bytes\n", rep_len);

		if (rep_len < 0) {
			printf("nonfatal reply error: errno %d\n", errno);
			continue;
		}
		if (msg.n.nlmsg_type == NLMSG_ERROR ||
		    !NLMSG_OK((&msg.n), rep_len)) {
			printf("fatal reply error,  errno %d\n", errno);
			goto done;
		}

		PRINTF("nlmsghdr size=%d, 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;
		i = 0;
		while (len < rep_len) {
			len += NLA_ALIGN(na->nla_len);
			switch (na->nla_type) {
			case TASKSTATS_TYPE_AGGR_TGID:
				/* Fall through */
			case TASKSTATS_TYPE_AGGR_PID:
				aggr_len = NLA_PAYLOAD(na->nla_len);
				len2 = 0;
				/* For nested attributes, na follows */
				na = (struct nlattr *) NLA_DATA(na);
				done = 0;
				while (len2 < aggr_len) {
					switch (na->nla_type) {
					case TASKSTATS_TYPE_PID:
						rtid = *(int *) NLA_DATA(na);
						if (print_delays)
							printf("PID\t%d\n", rtid);
						break;
					case TASKSTATS_TYPE_TGID:
						rtid = *(int *) NLA_DATA(na);
						if (print_delays)
							printf("TGID\t%d\n", rtid);
						break;
					case TASKSTATS_TYPE_STATS:
						count++;
						if (print_delays)
							print_delayacct((struct taskstats *) NLA_DATA(na));
						if (fd) {
							if (write(fd, NLA_DATA(na), na->nla_len) < 0) {
								err(1,"write error\n");
							}
						}
						if (!loop)
							goto done;
						break;
					default:
						printf("Unknown nested nla_type %d\n", na->nla_type);
						break;
					}
					len2 += NLA_ALIGN(na->nla_len);
					na = (struct nlattr *) ((char *) na + len2);
				}
				break;

			default:
				printf("Unknown nla_type %d\n", na->nla_type);
				break;
			}
			na = (struct nlattr *) (GENLMSG_DATA(&msg) + len);
		}
	} while (loop);
done:
	if (maskset) {
		rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
			      TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK,
			      &cpumask, sizeof(cpumask));
		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);
	return 0;
}
Commit	Line	Data
a3baf649 SN	1	/* getdelays.c
	2	*
	3	* Utility to get per-pid and per-tgid delay accounting statistics
	4	* Also illustrates usage of the taskstats interface
	5	*
	6	* Copyright (C) Shailabh Nagar, IBM Corp. 2005
	7	* Copyright (C) Balbir Singh, IBM Corp. 2006
9e06d3f9	8	* Copyright (c) Jay Lan, SGI. 2006
a3baf649 SN	9	*
	10	*/
	11
	12	#include <stdio.h>
	13	#include <stdlib.h>
	14	#include <errno.h>
	15	#include <unistd.h>
	16	#include <poll.h>
	17	#include <string.h>
	18	#include <fcntl.h>
	19	#include <sys/types.h>
	20	#include <sys/stat.h>
	21	#include <sys/socket.h>
	22	#include <sys/types.h>
	23	#include <signal.h>
	24
	25	#include <linux/genetlink.h>
	26	#include <linux/taskstats.h>
	27
	28	/*
	29	* Generic macros for dealing with netlink sockets. Might be duplicated
	30	* elsewhere. It is recommended that commercial grade applications use
	31	* libnl or libnetlink and use the interfaces provided by the library
	32	*/
	33	#define GENLMSG_DATA(glh) ((void *)(NLMSG_DATA(glh) + GENL_HDRLEN))
	34	#define GENLMSG_PAYLOAD(glh) (NLMSG_PAYLOAD(glh, 0) - GENL_HDRLEN)
	35	#define NLA_DATA(na) ((void )((char)(na) + NLA_HDRLEN))
	36	#define NLA_PAYLOAD(len) (len - NLA_HDRLEN)
	37
	38	#define err(code, fmt, arg...) do { printf(fmt, ##arg); exit(code); } while (0)
	39	int done = 0;
9e06d3f9 SN	40	int rcvbufsz=0;
	41
	42	char name[100];
	43	int dbg=0, print_delays=0;
	44	__u64 stime, utime;
	45	#define PRINTF(fmt, arg...) { \
	46	if (dbg) { \
	47	printf(fmt, ##arg); \
	48	} \
	49	}
	50
	51	/* Maximum size of response requested or message sent */
	52	#define MAX_MSG_SIZE 256
	53	/* Maximum number of cpus expected to be specified in a cpumask */
	54	#define MAX_CPUS 32
	55	/* Maximum length of pathname to log file */
	56	#define MAX_FILENAME 256
	57
	58	struct msgtemplate {
	59	struct nlmsghdr n;
	60	struct genlmsghdr g;
	61	char buf[MAX_MSG_SIZE];
	62	};
	63
	64	char cpumask[100+6*MAX_CPUS];
a3baf649 SN	65
	66	/*
	67	* Create a raw netlink socket and bind
	68	*/
9e06d3f9	69	static int create_nl_socket(int protocol)
a3baf649	70	{
9e06d3f9 SN	71	int fd;
	72	struct sockaddr_nl local;
	73
	74	fd = socket(AF_NETLINK, SOCK_RAW, protocol);
	75	if (fd < 0)
	76	return -1;
	77
	78	if (rcvbufsz)
	79	if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF,
	80	&rcvbufsz, sizeof(rcvbufsz)) < 0) {
	81	printf("Unable to set socket rcv buf size to %d\n",
	82	rcvbufsz);
	83	return -1;
	84	}
a3baf649	85
9e06d3f9 SN	86	memset(&local, 0, sizeof(local));
9e06d3f9 SN	87	local.nl_family = AF_NETLINK;
a3baf649	88
9e06d3f9 SN	89	if (bind(fd, (struct sockaddr *) &local, sizeof(local)) < 0)
9e06d3f9 SN	90	goto error;
a3baf649	91
9e06d3f9 SN	92	return fd;
	93	error:
	94	close(fd);
	95	return -1;
a3baf649 SN	96	}
a3baf649 SN	97
9e06d3f9 SN	98
	99	int send_cmd(int sd, __u16 nlmsg_type, __u32 nlmsg_pid,
	100	__u8 genl_cmd, __u16 nla_type,
	101	void *nla_data, int nla_len)
a3baf649	102	{
9e06d3f9 SN	103	struct nlattr *na;
	104	struct sockaddr_nl nladdr;
	105	int r, buflen;
	106	char *buf;
	107
	108	struct msgtemplate msg;
	109
	110	msg.n.nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN);
	111	msg.n.nlmsg_type = nlmsg_type;
	112	msg.n.nlmsg_flags = NLM_F_REQUEST;
	113	msg.n.nlmsg_seq = 0;
	114	msg.n.nlmsg_pid = nlmsg_pid;
	115	msg.g.cmd = genl_cmd;
	116	msg.g.version = 0x1;
	117	na = (struct nlattr *) GENLMSG_DATA(&msg);
	118	na->nla_type = nla_type;
	119	na->nla_len = nla_len + 1 + NLA_HDRLEN;
	120	memcpy(NLA_DATA(na), nla_data, nla_len);
	121	msg.n.nlmsg_len += NLMSG_ALIGN(na->nla_len);
	122
	123	buf = (char *) &msg;
	124	buflen = msg.n.nlmsg_len ;
	125	memset(&nladdr, 0, sizeof(nladdr));
	126	nladdr.nl_family = AF_NETLINK;
	127	while ((r = sendto(sd, buf, buflen, 0, (struct sockaddr *) &nladdr,
	128	sizeof(nladdr))) < buflen) {
	129	if (r > 0) {
	130	buf += r;
	131	buflen -= r;
	132	} else if (errno != EAGAIN)
	133	return -1;
	134	}
	135	return 0;
a3baf649 SN	136	}
a3baf649 SN	137
9e06d3f9	138
a3baf649 SN	139	/*
	140	* Probe the controller in genetlink to find the family id
	141	* for the TASKSTATS family
	142	*/
	143	int get_family_id(int sd)
	144	{
9e06d3f9 SN	145	struct {
	146	struct nlmsghdr n;
	147	struct genlmsghdr g;
	148	char buf[256];
	149	} ans;
	150
	151	int id, rc;
	152	struct nlattr *na;
	153	int rep_len;
	154
	155	strcpy(name, TASKSTATS_GENL_NAME);
	156	rc = send_cmd(sd, GENL_ID_CTRL, getpid(), CTRL_CMD_GETFAMILY,
	157	CTRL_ATTR_FAMILY_NAME, (void *)name,
	158	strlen(TASKSTATS_GENL_NAME)+1);
	159
	160	rep_len = recv(sd, &ans, sizeof(ans), 0);
	161	if (ans.n.nlmsg_type == NLMSG_ERROR \|\|
	162	(rep_len < 0) \|\| !NLMSG_OK((&ans.n), rep_len))
	163	return 0;
a3baf649	164
9e06d3f9 SN	165	na = (struct nlattr *) GENLMSG_DATA(&ans);
	166	na = (struct nlattr ) ((char ) na + NLA_ALIGN(na->nla_len));
	167	if (na->nla_type == CTRL_ATTR_FAMILY_ID) {
	168	id = (__u16 ) NLA_DATA(na);
	169	}
	170	return id;
a3baf649 SN	171	}
a3baf649 SN	172
9e06d3f9	173	void print_delayacct(struct taskstats *t)
a3baf649	174	{
9e06d3f9 SN	175	printf("\n\nCPU %15s%15s%15s%15s\n"
	176	" %15llu%15llu%15llu%15llu\n"
	177	"IO %15s%15s\n"
	178	" %15llu%15llu\n"
	179	"MEM %15s%15s\n"
	180	" %15llu%15llu\n\n",
	181	"count", "real total", "virtual total", "delay total",
	182	t->cpu_count, t->cpu_run_real_total, t->cpu_run_virtual_total,
	183	t->cpu_delay_total,
	184	"count", "delay total",
	185	t->blkio_count, t->blkio_delay_total,
	186	"count", "delay total", t->swapin_count, t->swapin_delay_total);
a3baf649 SN	187	}
	188
	189	int main(int argc, char *argv[])
	190	{
9e06d3f9 SN	191	int c, rc, rep_len, aggr_len, len2, cmd_type;
	192	__u16 id;
	193	__u32 mypid;
	194
	195	struct nlattr *na;
	196	int nl_sd = -1;
	197	int len = 0;
	198	pid_t tid = 0;
	199	pid_t rtid = 0;
	200
	201	int fd = 0;
	202	int count = 0;
	203	int write_file = 0;
	204	int maskset = 0;
	205	char logfile[128];
	206	int loop = 0;
	207
	208	struct msgtemplate msg;
	209
	210	while (1) {
	211	c = getopt(argc, argv, "dw:r:m:t:p:v:l");
	212	if (c < 0)
	213	break;
a3baf649	214
9e06d3f9 SN	215	switch (c) {
	216	case 'd':
	217	printf("print delayacct stats ON\n");
	218	print_delays = 1;
	219	break;
	220	case 'w':
	221	strncpy(logfile, optarg, MAX_FILENAME);
	222	printf("write to file %s\n", logfile);
	223	write_file = 1;
	224	break;
	225	case 'r':
	226	rcvbufsz = atoi(optarg);
	227	printf("receive buf size %d\n", rcvbufsz);
	228	if (rcvbufsz < 0)
	229	err(1, "Invalid rcv buf size\n");
	230	break;
	231	case 'm':
	232	strncpy(cpumask, optarg, sizeof(cpumask));
	233	maskset = 1;
	234	printf("cpumask %s maskset %d\n", cpumask, maskset);
	235	break;
	236	case 't':
	237	tid = atoi(optarg);
	238	if (!tid)
	239	err(1, "Invalid tgid\n");
	240	cmd_type = TASKSTATS_CMD_ATTR_TGID;
	241	print_delays = 1;
	242	break;
	243	case 'p':
	244	tid = atoi(optarg);
	245	if (!tid)
	246	err(1, "Invalid pid\n");
	247	cmd_type = TASKSTATS_CMD_ATTR_PID;
	248	print_delays = 1;
	249	break;
	250	case 'v':
	251	printf("debug on\n");
	252	dbg = 1;
	253	break;
	254	case 'l':
	255	printf("listen forever\n");
	256	loop = 1;
	257	break;
	258	default:
	259	printf("Unknown option %d\n", c);
	260	exit(-1);
a3baf649	261	}
a3baf649	262	}
a3baf649	263
9e06d3f9 SN	264	if (write_file) {
	265	fd = open(logfile, O_WRONLY \| O_CREAT \| O_TRUNC,
	266	S_IRUSR \| S_IWUSR \| S_IRGRP \| S_IROTH);
	267	if (fd == -1) {
	268	perror("Cannot open output file\n");
	269	exit(1);
	270	}
	271	}
a3baf649	272
9e06d3f9 SN	273	if ((nl_sd = create_nl_socket(NETLINK_GENERIC)) < 0)
9e06d3f9 SN	274	err(1, "error creating Netlink socket\n");
a3baf649	275
a3baf649	276
9e06d3f9 SN	277	mypid = getpid();
	278	id = get_family_id(nl_sd);
	279	if (!id) {
	280	printf("Error getting family id, errno %d", errno);
	281	goto err;
a3baf649	282	}
9e06d3f9 SN	283	PRINTF("family id %d\n", id);
	284
	285	if (maskset) {
	286	rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
	287	TASKSTATS_CMD_ATTR_REGISTER_CPUMASK,
	288	&cpumask, sizeof(cpumask));
	289	PRINTF("Sent register cpumask, retval %d\n", rc);
	290	if (rc < 0) {
	291	printf("error sending register cpumask\n");
	292	goto err;
	293	}
a3baf649 SN	294	}
a3baf649 SN	295
9e06d3f9 SN	296	if (tid) {
	297	rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
	298	cmd_type, &tid, sizeof(__u32));
	299	PRINTF("Sent pid/tgid, retval %d\n", rc);
	300	if (rc < 0) {
	301	printf("error sending tid/tgid cmd\n");
	302	goto done;
	303	}
a3baf649 SN	304	}
a3baf649 SN	305
9e06d3f9 SN	306	do {
9e06d3f9 SN	307	int i;
a3baf649	308
9e06d3f9 SN	309	rep_len = recv(nl_sd, &msg, sizeof(msg), 0);
9e06d3f9 SN	310	PRINTF("received %d bytes\n", rep_len);
a3baf649	311
9e06d3f9 SN	312	if (rep_len < 0) {
	313	printf("nonfatal reply error: errno %d\n", errno);
	314	continue;
	315	}
	316	if (msg.n.nlmsg_type == NLMSG_ERROR \|\|
	317	!NLMSG_OK((&msg.n), rep_len)) {
	318	printf("fatal reply error, errno %d\n", errno);
	319	goto done;
	320	}
	321
	322	PRINTF("nlmsghdr size=%d, nlmsg_len=%d, rep_len=%d\n",
	323	sizeof(struct nlmsghdr), msg.n.nlmsg_len, rep_len);
	324
	325
	326	rep_len = GENLMSG_PAYLOAD(&msg.n);
	327
	328	na = (struct nlattr *) GENLMSG_DATA(&msg);
	329	len = 0;
	330	i = 0;
	331	while (len < rep_len) {
	332	len += NLA_ALIGN(na->nla_len);
	333	switch (na->nla_type) {
	334	case TASKSTATS_TYPE_AGGR_TGID:
	335	/* Fall through */
	336	case TASKSTATS_TYPE_AGGR_PID:
	337	aggr_len = NLA_PAYLOAD(na->nla_len);
	338	len2 = 0;
	339	/* For nested attributes, na follows */
	340	na = (struct nlattr *) NLA_DATA(na);
	341	done = 0;
	342	while (len2 < aggr_len) {
	343	switch (na->nla_type) {
	344	case TASKSTATS_TYPE_PID:
	345	rtid = (int ) NLA_DATA(na);
	346	if (print_delays)
	347	printf("PID\t%d\n", rtid);
	348	break;
	349	case TASKSTATS_TYPE_TGID:
	350	rtid = (int ) NLA_DATA(na);
	351	if (print_delays)
	352	printf("TGID\t%d\n", rtid);
	353	break;
	354	case TASKSTATS_TYPE_STATS:
	355	count++;
	356	if (print_delays)
	357	print_delayacct((struct taskstats *) NLA_DATA(na));
	358	if (fd) {
	359	if (write(fd, NLA_DATA(na), na->nla_len) < 0) {
	360	err(1,"write error\n");
	361	}
	362	}
	363	if (!loop)
	364	goto done;
	365	break;
	366	default:
	367	printf("Unknown nested nla_type %d\n", na->nla_type);
	368	break;
	369	}
	370	len2 += NLA_ALIGN(na->nla_len);
	371	na = (struct nlattr ) ((char ) na + len2);
	372	}
	373	break;
	374
	375	default:
376	printf("Unknown nla_type %d\n", na->nla_type);
377	break;
a3baf649	378	}
9e06d3f9	379	na = (struct nlattr *) (GENLMSG_DATA(&msg) + len);
a3baf649	380	}
9e06d3f9 SN	381	} while (loop);
	382	done:
	383	if (maskset) {
	384	rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
	385	TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK,
	386	&cpumask, sizeof(cpumask));
	387	printf("Sent deregister mask, retval %d\n", rc);
	388	if (rc < 0)
	389	err(rc, "error sending deregister cpumask\n");
a3baf649	390	}
9e06d3f9 SN	391	err:
	392	close(nl_sd);
	393	if (fd)
	394	close(fd);
	395	return 0;
a3baf649	396	}