[ltt-control.git] / ltt-control / lttctl / lttctl.c

/* lttctl
 *
 * Linux Trace Toolkit Control
 *
 * Small program that controls LTT through libltt.
 *
 * Copyright 2005 -
 * 	Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <liblttctl/lttctl.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <signal.h>
#include <dirent.h>
#include <string.h>
#include <sys/stat.h>

/* Buffer for file copy : 4k seems optimal. */
#define BUF_SIZE 4096

enum trace_ctl_op {
	CTL_OP_CREATE_START,
	CTL_OP_CREATE,
	CTL_OP_DESTROY,
	CTL_OP_STOP_DESTROY,
	CTL_OP_START,
	CTL_OP_STOP,
	CTL_OP_DAEMON,
	CTL_OP_DESCRIPTION,
	CTL_OP_NONE
};

static char *trace_name = NULL;
static char *trace_type = "relay";
static char *mode_name = NULL;
static unsigned subbuf_size = 0;
static unsigned n_subbufs = 0;
static unsigned append_trace = 0;
static enum trace_mode mode = LTT_TRACE_NORMAL;
static enum trace_ctl_op op = CTL_OP_NONE;
static char *channel_root = NULL;
static char *trace_root = NULL;
static char *num_threads = "1";

static int sigchld_received = 0;

void sigchld_handler(int signo)
{
	printf("signal %d received\n", signo);
	sigchld_received = 1;
}


/* Args :
 *
 */
void show_arguments(void)
{
	printf("Please use the following arguments :\n");
	printf("\n");
	printf("-n name			 Name of the trace.\n");
	printf("-b						Create trace channels and start tracing (no daemon).\n");
	printf("-c						Create trace channels.\n");
	printf("-m mode			 Normal or flight recorder mode.\n");
	printf("							Mode values : normal (default) or flight.\n");
	printf("-r						Destroy trace channels.\n");
	printf("-R						Stop tracing and destroy trace channels.\n");
	printf("-s						Start tracing.\n");
	//printf("							Note : will automatically create a normal trace if "
	//											"none exists.\n");
	printf("-q						Stop tracing.\n");
	printf("-d						Create trace, spawn a lttd daemon, start tracing.\n");
	printf("							(optionnaly, you can set LTT_DAEMON\n");
	printf("							and the LTT_FACILITIES env. vars.)\n");
	printf("-t						Trace root path. (ex. /root/traces/example_trace)\n");
	printf("-T						Type of trace (ex. relay)\n");
	printf("-l						LTT channels root path. (ex. /mnt/relayfs/ltt)\n");
	printf("-z						Size of the subbuffers (will be rounded to next page size)\n");
	printf("-x						Number of subbuffers\n");
	printf("-e						Get XML facilities description\n");
	printf("-a						Append to trace\n");
	printf("-N						Number of lttd threads\n");
	printf("\n");
}


/* parse_arguments
 *
 * Parses the command line arguments.
 *
 * Returns -1 if the arguments were correct, but doesn't ask for program
 * continuation. Returns EINVAL if the arguments are incorrect, or 0 if OK.
 */
int parse_arguments(int argc, char **argv)
{
	int ret = 0;
	int argn = 1;
	
	if(argc == 2) {
		if(strcmp(argv[1], "-h") == 0) {
			return -1;
		}
	}

	while(argn < argc) {

		switch(argv[argn][0]) {
			case '-':
				switch(argv[argn][1]) {
					case 'n':
						if(argn+1 < argc) {
							trace_name = argv[argn+1];
							argn++;
						} else {
							printf("Specify a trace name after -n.\n");
							printf("\n");
							ret = EINVAL;
						}

						break;
					case 'b':
						op = CTL_OP_CREATE_START;
						break;
					case 'c':
						op = CTL_OP_CREATE;
						break;
					case 'm':
						if(argn+1 < argc) {
							mode_name = argv[argn+1];
							argn++;
							if(strcmp(mode_name, "normal") == 0)
								mode = LTT_TRACE_NORMAL;
							else if(strcmp(mode_name, "flight") == 0)
								mode = LTT_TRACE_FLIGHT;
							else {
								printf("Invalid mode '%s'.\n", argv[argn]);
								printf("\n");
								ret = EINVAL;
							}
						} else {
								printf("Specify a mode after -m.\n");
								printf("\n");
								ret = EINVAL;
						}
						break;
					case 'r':
						op = CTL_OP_DESTROY;
						break;
					case 'R':
						op = CTL_OP_STOP_DESTROY;
						break;
					case 's':
						op = CTL_OP_START;
						break;
					case 'q':
						op = CTL_OP_STOP;
						break;
					case 'z':
						if(argn+1 < argc) {
							subbuf_size = (unsigned)atoi(argv[argn+1]);
							argn++;
						} else {
							printf("Specify a number of subbuffers after -z.\n");
							printf("\n");
							ret = EINVAL;
						}
						break;
					case 'x':
						if(argn+1 < argc) {
							n_subbufs = (unsigned)atoi(argv[argn+1]);
							argn++;
						} else {
							printf("Specify a subbuffer size after -x.\n");
							printf("\n");
							ret = EINVAL;
						}
						break;
					case 'd':
						op = CTL_OP_DAEMON;
						break;
					case 'e':
						op = CTL_OP_DESCRIPTION;
						break;
					case 't':
						if(argn+1 < argc) {
							trace_root = argv[argn+1];
							argn++;
						} else {
							printf("Specify a trace root path after -t.\n");
							printf("\n");
							ret = EINVAL;
						}
						break;
					case 'l':
						if(argn+1 < argc) {
							channel_root = argv[argn+1];
							argn++;
						} else {
							printf("Specify a channel root path after -l.\n");
							printf("\n");
							ret = EINVAL;
						}
						break;
					case 'a':
						append_trace = 1;
						break;
					case 'N':
						if(argn+1 < argc) {
							num_threads = argv[argn+1];
							argn++;
						}
						break;
					case 'T':
						if(argn+1 < argc) {
							trace_type = argv[argn+1];
							argn++;
						} else {
							printf("Specify a trace type after -T.\n");
							printf("\n");
							ret = EINVAL;
						}
						break;
					default:
						printf("Invalid argument '%s'.\n", argv[argn]);
						printf("\n");
						ret = EINVAL;
				}
				break;
			default:
				printf("Invalid argument '%s'.\n", argv[argn]);
				printf("\n");
				ret = EINVAL;
		}
		argn++;
	}
	
	if(op != CTL_OP_DESCRIPTION && trace_name == NULL) {
		printf("Please specify a trace name.\n");
		printf("\n");
		ret = EINVAL;
	}

	if(op == CTL_OP_NONE) {
		printf("Please specify an operation.\n");
		printf("\n");
		ret = EINVAL;
	}

	if(op == CTL_OP_DAEMON) {
		if(trace_root == NULL) {
			printf("Please specify -t trace_root_path with the -d option.\n");
			printf("\n");
			ret = EINVAL;
		}
		if(channel_root == NULL) {
			printf("Please specify -l ltt_root_path with the -d option.\n");
			printf("\n");
			ret = EINVAL;
		}
	}

	if(op == CTL_OP_DESCRIPTION) {
		if(trace_root == NULL) {
			printf("Please specify -t trace_root_path with the -e option.\n");
			printf("\n");
			ret = EINVAL;
		}
	}

	return ret;
}

void show_info(void)
{
	printf("Linux Trace Toolkit Trace Control\n");
	printf("\n");
	if(trace_name != NULL) {
		printf("Controlling trace : %s\n", trace_name);
		printf("\n");
	}
}

int create_eventdefs(void)
{
	int ret = 0;
	char eventdefs_path[PATH_MAX];
	char eventdefs_file[PATH_MAX];
	char facilities_file[PATH_MAX];
	char read_buf[BUF_SIZE];
	struct dirent *entry;
	char *facilities_path = getenv("LTT_FACILITIES");
	if(facilities_path == NULL) facilities_path =
					PACKAGE_DATA_DIR "/" PACKAGE "/facilities";

	ret = mkdir(trace_root, S_IRWXU|S_IRWXG|S_IRWXO);
	if(ret == -1 && errno != EEXIST) {
		ret = errno;
		perror("Cannot create trace_root directory");
		printf("trace_root is %s\n", trace_root);
		goto error;
	}
	ret = 0;
	
	size_t trace_root_len = strlen(trace_root);
	strncpy(eventdefs_path, trace_root, PATH_MAX);
	strncat(eventdefs_path, "/eventdefs/", PATH_MAX - trace_root_len);
	size_t eventdefs_path_len = strlen(eventdefs_path);
	ret = mkdir(eventdefs_path, S_IRWXU|S_IRWXG|S_IRWXO);
	if(ret == -1 && (!append_trace || errno != EEXIST)) {
		ret = errno;
		perror("Cannot create eventdefs directory");
		goto error;
	}
	ret = 0;
	
	DIR *facilities_dir = opendir(facilities_path);
	
	if(facilities_dir == NULL) {
		perror("Cannot open facilities directory");
		ret = EEXIST;
		goto error;
	}

	while((entry = readdir(facilities_dir)) != NULL) {
		if(entry->d_name[0] == '.') continue;
		
		printf("Appending facility file %s\n", entry->d_name);
		strncpy(eventdefs_file, eventdefs_path, PATH_MAX);
		strncat(eventdefs_file, entry->d_name, PATH_MAX - eventdefs_path_len);
		/* Append to the file */
		FILE *dest = fopen(eventdefs_file, "a");
		if(!dest) {
			perror("Cannot create eventdefs file");
			continue;
		}
		strncpy(facilities_file, facilities_path, PATH_MAX);
		size_t facilities_dir_len = strlen(facilities_path);
		strncat(facilities_file, "/", PATH_MAX - facilities_dir_len);
		strncat(facilities_file, entry->d_name, PATH_MAX - facilities_dir_len-1);
		FILE *src = fopen(facilities_file, "r");
		if(!src) {
			ret = errno;
			perror("Cannot open eventdefs file for reading");
			goto close_dest;
		}

		do {
			size_t read_size, write_size;
			read_size = fread(read_buf, sizeof(char), BUF_SIZE, src);
			if(ferror(src)) {
				ret = errno;
				perror("Cannot read eventdefs file");
				goto close_src;
			}
			write_size = fwrite(read_buf, sizeof(char), read_size, dest);
			if(ferror(dest)) {
				ret = errno;
				perror("Cannot write eventdefs file");
				goto close_src;
			}
		} while(!feof(src));

		/* Add spacing between facilities */
		fwrite("\n", 1, 1, dest);
		
close_src:
		fclose(src);
close_dest:
		fclose(dest);
	}

	closedir(facilities_dir);

error:
	return ret;

}


int lttctl_daemon(struct lttctl_handle *handle, char *trace_name)
{
	char channel_path[PATH_MAX] = "";
	pid_t pid;
	int ret;
	char *lttd_path = getenv("LTT_DAEMON");
	struct sigaction act;

	if(lttd_path == NULL) lttd_path = 
		PACKAGE_BIN_DIR "/lttd";
	
	strcat(channel_path, channel_root);
	strcat(channel_path, "/");
	strcat(channel_path, trace_name);

	
	ret = lttctl_create_trace(handle, trace_name, mode, trace_type, subbuf_size, n_subbufs);
	if(ret != 0) goto create_error;

	act.sa_handler = sigchld_handler;
	sigemptyset(&(act.sa_mask));
	sigaddset(&(act.sa_mask), SIGCHLD);
	sigaction(SIGCHLD, &act, NULL);
	
	pid = fork();

	if(pid > 0) {
		int status;
		/* parent */
		while(!(sigchld_received)) pause();

		ret = waitpid(pid, &status, 0);
		if(ret == -1) {
			ret = errno;
			perror("Error in waitpid");
			goto start_error;
		}

		ret = 0;
		if(WIFEXITED(status))
			ret = WEXITSTATUS(status);
		if(ret) goto start_error;

		printf("Creating supplementary trace files\n");
		ret = create_eventdefs();
		if(ret) goto start_error;

	} else if(pid == 0) {
		/* child */
		int ret;
		if(append_trace) 
			ret =	execlp(lttd_path, lttd_path, "-t", trace_root, "-c",
											 channel_path, "-d", "-a", "-N", num_threads, NULL);
		else
			ret =	execlp(lttd_path, lttd_path, "-t", trace_root, "-c",
											 channel_path, "-d", "-N", num_threads, NULL);
		if(ret) {
			ret = errno;
			perror("Error in executing the lttd daemon");
			exit(ret);
		}
	} else {
		/* error */
		perror("Error in forking for lttd daemon");
	}

	ret = lttctl_start(handle, trace_name);
	if(ret != 0) goto start_error;

	return 0;

	/* error handling */
start_error:
	printf("Trace start error\n");
	ret |= lttctl_destroy_trace(handle, trace_name);
create_error:
	return ret;
}

int main(int argc, char ** argv)
{
	int ret;
	struct lttctl_handle *handle;
	
	ret = parse_arguments(argc, argv);

	if(ret != 0) show_arguments();
	if(ret == EINVAL) return EINVAL;
	if(ret == -1) return 0;

	show_info();
	
	handle = lttctl_create_handle();
	
	if(handle == NULL) return -1;
	
	switch(op) {
		case CTL_OP_CREATE_START:
			ret = lttctl_create_trace(handle, trace_name, mode, trace_type, subbuf_size,
																n_subbufs);
			if(!ret)
				ret = lttctl_start(handle, trace_name);
			break;
		case CTL_OP_CREATE:
			ret = lttctl_create_trace(handle, trace_name, mode, trace_type, subbuf_size,
																n_subbufs);
			break;
		case CTL_OP_DESTROY:
			ret = lttctl_destroy_trace(handle, trace_name);
			break;
		case CTL_OP_STOP_DESTROY:
			ret = lttctl_stop(handle, trace_name);
			if(!ret)
				ret = lttctl_destroy_trace(handle, trace_name);
			break;
		case CTL_OP_START:
			ret = lttctl_start(handle, trace_name);
			break;
		case CTL_OP_STOP:
			ret = lttctl_stop(handle, trace_name);
			break;
		case CTL_OP_DAEMON:
			ret = lttctl_daemon(handle, trace_name);
			break;
		case CTL_OP_DESCRIPTION:
			ret = create_eventdefs();
			break;
		case CTL_OP_NONE:
			break;
	}

	ret |= lttctl_destroy_handle(handle);
	
	return ret;
}
Commit	Line	Data
2727692a	1	/* lttctl
	2	*
	3	* Linux Trace Toolkit Control
	4	*
	5	* Small program that controls LTT through libltt.
	6	*
	7	* Copyright 2005 -
	8	* Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
	9	*/
	10
	11	#ifdef HAVE_CONFIG_H
	12	#include <config.h>
	13	#endif
	14
	15	#include <liblttctl/lttctl.h>
	16	#include <errno.h>
	17	#include <stdio.h>
	18	#include <stdlib.h>
	19	#include <sys/types.h>
	20	#include <sys/wait.h>
	21	#include <unistd.h>
	22	#include <signal.h>
	23	#include <dirent.h>
	24	#include <string.h>
	25	#include <sys/stat.h>
	26
	27	/* Buffer for file copy : 4k seems optimal. */
	28	#define BUF_SIZE 4096
	29
	30	enum trace_ctl_op {
900b24a9	31	CTL_OP_CREATE_START,
2727692a	32	CTL_OP_CREATE,
2727692a	33	CTL_OP_DESTROY,
900b24a9	34	CTL_OP_STOP_DESTROY,
2727692a	35	CTL_OP_START,
	36	CTL_OP_STOP,
	37	CTL_OP_DAEMON,
	38	CTL_OP_DESCRIPTION,
	39	CTL_OP_NONE
	40	};
	41
	42	static char *trace_name = NULL;
9f46b64c	43	static char *trace_type = "relay";
2727692a	44	static char *mode_name = NULL;
	45	static unsigned subbuf_size = 0;
	46	static unsigned n_subbufs = 0;
	47	static unsigned append_trace = 0;
	48	static enum trace_mode mode = LTT_TRACE_NORMAL;
	49	static enum trace_ctl_op op = CTL_OP_NONE;
	50	static char *channel_root = NULL;
	51	static char *trace_root = NULL;
	52	static char *num_threads = "1";
	53
	54	static int sigchld_received = 0;
	55
	56	void sigchld_handler(int signo)
	57	{
	58	printf("signal %d received\n", signo);
	59	sigchld_received = 1;
	60	}
	61
	62
	63	/* Args :
	64	*
	65	*/
	66	void show_arguments(void)
	67	{
	68	printf("Please use the following arguments :\n");
	69	printf("\n");
900b24a9	70	printf("-n name Name of the trace.\n");
	71	printf("-b Create trace channels and start tracing (no daemon).\n");
	72	printf("-c Create trace channels.\n");
	73	printf("-m mode Normal or flight recorder mode.\n");
	74	printf(" Mode values : normal (default) or flight.\n");
	75	printf("-r Destroy trace channels.\n");
	76	printf("-R Stop tracing and destroy trace channels.\n");
	77	printf("-s Start tracing.\n");
	78	//printf(" Note : will automatically create a normal trace if "
2727692a	79	// "none exists.\n");
900b24a9	80	printf("-q Stop tracing.\n");
	81	printf("-d Create trace, spawn a lttd daemon, start tracing.\n");
	82	printf(" (optionnaly, you can set LTT_DAEMON\n");
	83	printf(" and the LTT_FACILITIES env. vars.)\n");
	84	printf("-t Trace root path. (ex. /root/traces/example_trace)\n");
	85	printf("-T Type of trace (ex. relay)\n");
	86	printf("-l LTT channels root path. (ex. /mnt/relayfs/ltt)\n");
	87	printf("-z Size of the subbuffers (will be rounded to next page size)\n");
	88	printf("-x Number of subbuffers\n");
	89	printf("-e Get XML facilities description\n");
	90	printf("-a Append to trace\n");
	91	printf("-N Number of lttd threads\n");
2727692a	92	printf("\n");
	93	}
	94
	95
	96	/* parse_arguments
	97	*
	98	* Parses the command line arguments.
	99	*
	100	* Returns -1 if the arguments were correct, but doesn't ask for program
	101	* continuation. Returns EINVAL if the arguments are incorrect, or 0 if OK.
	102	*/
	103	int parse_arguments(int argc, char **argv)
	104	{
	105	int ret = 0;
	106	int argn = 1;
	107
	108	if(argc == 2) {
	109	if(strcmp(argv[1], "-h") == 0) {
	110	return -1;
	111	}
	112	}
	113
	114	while(argn < argc) {
	115
	116	switch(argv[argn][0]) {
	117	case '-':
	118	switch(argv[argn][1]) {
	119	case 'n':
	120	if(argn+1 < argc) {
	121	trace_name = argv[argn+1];
	122	argn++;
	123	} else {
	124	printf("Specify a trace name after -n.\n");
	125	printf("\n");
	126	ret = EINVAL;
	127	}
	128
	129	break;
900b24a9	130	case 'b':
900b24a9	131	op = CTL_OP_CREATE_START;
2727692a	132	break;
	133	case 'c':
	134	op = CTL_OP_CREATE;
900b24a9	135	break;
2727692a	136	case 'm':
	137	if(argn+1 < argc) {
	138	mode_name = argv[argn+1];
	139	argn++;
	140	if(strcmp(mode_name, "normal") == 0)
	141	mode = LTT_TRACE_NORMAL;
	142	else if(strcmp(mode_name, "flight") == 0)
	143	mode = LTT_TRACE_FLIGHT;
	144	else {
	145	printf("Invalid mode '%s'.\n", argv[argn]);
	146	printf("\n");
	147	ret = EINVAL;
	148	}
	149	} else {
	150	printf("Specify a mode after -m.\n");
	151	printf("\n");
	152	ret = EINVAL;
	153	}
	154	break;
	155	case 'r':
	156	op = CTL_OP_DESTROY;
	157	break;
	158	case 'R':
	159	op = CTL_OP_STOP_DESTROY;
	160	break;
	161	case 's':
	162	op = CTL_OP_START;
	163	break;
	164	case 'q':
	165	op = CTL_OP_STOP;
	166	break;
	167	case 'z':
	168	if(argn+1 < argc) {
	169	subbuf_size = (unsigned)atoi(argv[argn+1]);
	170	argn++;
	171	} else {
	172	printf("Specify a number of subbuffers after -z.\n");
	173	printf("\n");
	174	ret = EINVAL;
	175	}
	176	break;
	177	case 'x':
	178	if(argn+1 < argc) {
	179	n_subbufs = (unsigned)atoi(argv[argn+1]);
	180	argn++;
	181	} else {
	182	printf("Specify a subbuffer size after -x.\n");
	183	printf("\n");
	184	ret = EINVAL;
	185	}
	186	break;
	187	case 'd':
	188	op = CTL_OP_DAEMON;
	189	break;
900b24a9	190	case 'e':
	191	op = CTL_OP_DESCRIPTION;
	192	break;
2727692a	193	case 't':
	194	if(argn+1 < argc) {
	195	trace_root = argv[argn+1];
	196	argn++;
	197	} else {
	198	printf("Specify a trace root path after -t.\n");
	199	printf("\n");
	200	ret = EINVAL;
	201	}
	202	break;
	203	case 'l':
	204	if(argn+1 < argc) {
	205	channel_root = argv[argn+1];
	206	argn++;
	207	} else {
	208	printf("Specify a channel root path after -l.\n");
	209	printf("\n");
	210	ret = EINVAL;
	211	}
	212	break;
900b24a9	213	case 'a':
	214	append_trace = 1;
	215	break;
	216	case 'N':
2727692a	217	if(argn+1 < argc) {
	218	num_threads = argv[argn+1];
	219	argn++;
	220	}
	221	break;
9f46b64c	222	case 'T':
	223	if(argn+1 < argc) {
	224	trace_type = argv[argn+1];
	225	argn++;
	226	} else {
	227	printf("Specify a trace type after -T.\n");
	228	printf("\n");
	229	ret = EINVAL;
	230	}
	231	break;
2727692a	232	default:
	233	printf("Invalid argument '%s'.\n", argv[argn]);
	234	printf("\n");
	235	ret = EINVAL;
	236	}
	237	break;
	238	default:
	239	printf("Invalid argument '%s'.\n", argv[argn]);
	240	printf("\n");
	241	ret = EINVAL;
	242	}
	243	argn++;
	244	}
	245
	246	if(op != CTL_OP_DESCRIPTION && trace_name == NULL) {
	247	printf("Please specify a trace name.\n");
	248	printf("\n");
	249	ret = EINVAL;
	250	}
	251
	252	if(op == CTL_OP_NONE) {
	253	printf("Please specify an operation.\n");
	254	printf("\n");
	255	ret = EINVAL;
	256	}
	257
	258	if(op == CTL_OP_DAEMON) {
	259	if(trace_root == NULL) {
	260	printf("Please specify -t trace_root_path with the -d option.\n");
	261	printf("\n");
	262	ret = EINVAL;
	263	}
	264	if(channel_root == NULL) {
	265	printf("Please specify -l ltt_root_path with the -d option.\n");
	266	printf("\n");
	267	ret = EINVAL;
	268	}
	269	}
	270
900b24a9	271	if(op == CTL_OP_DESCRIPTION) {
900b24a9	272	if(trace_root == NULL) {
2727692a	273	printf("Please specify -t trace_root_path with the -e option.\n");
	274	printf("\n");
	275	ret = EINVAL;
900b24a9	276	}
900b24a9	277	}
2727692a	278
	279	return ret;
	280	}
	281
	282	void show_info(void)
	283	{
	284	printf("Linux Trace Toolkit Trace Control\n");
	285	printf("\n");
900b24a9	286	if(trace_name != NULL) {
	287	printf("Controlling trace : %s\n", trace_name);
	288	printf("\n");
	289	}
2727692a	290	}
	291
	292	int create_eventdefs(void)
	293	{
900b24a9	294	int ret = 0;
	295	char eventdefs_path[PATH_MAX];
	296	char eventdefs_file[PATH_MAX];
	297	char facilities_file[PATH_MAX];
	298	char read_buf[BUF_SIZE];
	299	struct dirent *entry;
2727692a	300	char *facilities_path = getenv("LTT_FACILITIES");
2727692a	301	if(facilities_path == NULL) facilities_path =
900b24a9	302	PACKAGE_DATA_DIR "/" PACKAGE "/facilities";
	303
	304	ret = mkdir(trace_root, S_IRWXU\|S_IRWXG\|S_IRWXO);
	305	if(ret == -1 && errno != EEXIST) {
	306	ret = errno;
	307	perror("Cannot create trace_root directory");
	308	printf("trace_root is %s\n", trace_root);
	309	goto error;
	310	}
	311	ret = 0;
	312
	313	size_t trace_root_len = strlen(trace_root);
	314	strncpy(eventdefs_path, trace_root, PATH_MAX);
	315	strncat(eventdefs_path, "/eventdefs/", PATH_MAX - trace_root_len);
	316	size_t eventdefs_path_len = strlen(eventdefs_path);
	317	ret = mkdir(eventdefs_path, S_IRWXU\|S_IRWXG\|S_IRWXO);
	318	if(ret == -1 && (!append_trace \|\| errno != EEXIST)) {
	319	ret = errno;
	320	perror("Cannot create eventdefs directory");
	321	goto error;
	322	}
	323	ret = 0;
	324
	325	DIR *facilities_dir = opendir(facilities_path);
	326
	327	if(facilities_dir == NULL) {
	328	perror("Cannot open facilities directory");
	329	ret = EEXIST;
	330	goto error;
	331	}
	332
	333	while((entry = readdir(facilities_dir)) != NULL) {
	334	if(entry->d_name[0] == '.') continue;
	335
	336	printf("Appending facility file %s\n", entry->d_name);
	337	strncpy(eventdefs_file, eventdefs_path, PATH_MAX);
	338	strncat(eventdefs_file, entry->d_name, PATH_MAX - eventdefs_path_len);
	339	/* Append to the file */
	340	FILE *dest = fopen(eventdefs_file, "a");
	341	if(!dest) {
	342	perror("Cannot create eventdefs file");
	343	continue;
	344	}
	345	strncpy(facilities_file, facilities_path, PATH_MAX);
	346	size_t facilities_dir_len = strlen(facilities_path);
	347	strncat(facilities_file, "/", PATH_MAX - facilities_dir_len);
	348	strncat(facilities_file, entry->d_name, PATH_MAX - facilities_dir_len-1);
	349	FILE *src = fopen(facilities_file, "r");
	350	if(!src) {
	351	ret = errno;
	352	perror("Cannot open eventdefs file for reading");
	353	goto close_dest;
	354	}
	355
	356	do {
	357	size_t read_size, write_size;
	358	read_size = fread(read_buf, sizeof(char), BUF_SIZE, src);
	359	if(ferror(src)) {
	360	ret = errno;
	361	perror("Cannot read eventdefs file");
	362	goto close_src;
	363	}
	364	write_size = fwrite(read_buf, sizeof(char), read_size, dest);
	365	if(ferror(dest)) {
366	ret = errno;
367	perror("Cannot write eventdefs file");
368	goto close_src;
369	}
370	} while(!feof(src));
371
372	/* Add spacing between facilities */
373	fwrite("\n", 1, 1, dest);
374
2727692a	375	close_src:
900b24a9	376	fclose(src);
2727692a	377	close_dest:
900b24a9	378	fclose(dest);
900b24a9	379	}
2727692a	380
900b24a9	381	closedir(facilities_dir);
2727692a	382
2727692a	383	error:
900b24a9	384	return ret;
2727692a	385
	386	}
	387
	388
	389	int lttctl_daemon(struct lttctl_handle handle, char trace_name)
	390	{
	391	char channel_path[PATH_MAX] = "";
	392	pid_t pid;
	393	int ret;
	394	char *lttd_path = getenv("LTT_DAEMON");
	395	struct sigaction act;
	396
	397	if(lttd_path == NULL) lttd_path =
900b24a9	398	PACKAGE_BIN_DIR "/lttd";
2727692a	399
	400	strcat(channel_path, channel_root);
	401	strcat(channel_path, "/");
	402	strcat(channel_path, trace_name);
	403
	404
9f46b64c	405	ret = lttctl_create_trace(handle, trace_name, mode, trace_type, subbuf_size, n_subbufs);
2727692a	406	if(ret != 0) goto create_error;
	407
	408	act.sa_handler = sigchld_handler;
	409	sigemptyset(&(act.sa_mask));
	410	sigaddset(&(act.sa_mask), SIGCHLD);
	411	sigaction(SIGCHLD, &act, NULL);
	412
	413	pid = fork();
	414
	415	if(pid > 0) {
900b24a9	416	int status;
2727692a	417	/* parent */
	418	while(!(sigchld_received)) pause();
	419
900b24a9	420	ret = waitpid(pid, &status, 0);
	421	if(ret == -1) {
	422	ret = errno;
	423	perror("Error in waitpid");
	424	goto start_error;
	425	}
	426
	427	ret = 0;
	428	if(WIFEXITED(status))
	429	ret = WEXITSTATUS(status);
	430	if(ret) goto start_error;
2727692a	431
2727692a	432	printf("Creating supplementary trace files\n");
900b24a9	433	ret = create_eventdefs();
900b24a9	434	if(ret) goto start_error;
2727692a	435
	436	} else if(pid == 0) {
	437	/* child */
900b24a9	438	int ret;
	439	if(append_trace)
	440	ret = execlp(lttd_path, lttd_path, "-t", trace_root, "-c",
	441	channel_path, "-d", "-a", "-N", num_threads, NULL);
	442	else
	443	ret = execlp(lttd_path, lttd_path, "-t", trace_root, "-c",
	444	channel_path, "-d", "-N", num_threads, NULL);
2727692a	445	if(ret) {
900b24a9	446	ret = errno;
2727692a	447	perror("Error in executing the lttd daemon");
	448	exit(ret);
	449	}
	450	} else {
	451	/* error */
	452	perror("Error in forking for lttd daemon");
	453	}
	454
	455	ret = lttctl_start(handle, trace_name);
	456	if(ret != 0) goto start_error;
	457
	458	return 0;
	459
	460	/* error handling */
	461	start_error:
900b24a9	462	printf("Trace start error\n");
2727692a	463	ret \|= lttctl_destroy_trace(handle, trace_name);
	464	create_error:
	465	return ret;
	466	}
	467
	468	int main(int argc, char ** argv)
	469	{
	470	int ret;
	471	struct lttctl_handle *handle;
	472
	473	ret = parse_arguments(argc, argv);
	474
	475	if(ret != 0) show_arguments();
	476	if(ret == EINVAL) return EINVAL;
	477	if(ret == -1) return 0;
	478
	479	show_info();
	480
	481	handle = lttctl_create_handle();
	482
	483	if(handle == NULL) return -1;
	484
	485	switch(op) {
900b24a9	486	case CTL_OP_CREATE_START:
9f46b64c	487	ret = lttctl_create_trace(handle, trace_name, mode, trace_type, subbuf_size,
2727692a	488	n_subbufs);
900b24a9	489	if(!ret)
	490	ret = lttctl_start(handle, trace_name);
	491	break;
	492	case CTL_OP_CREATE:
9f46b64c	493	ret = lttctl_create_trace(handle, trace_name, mode, trace_type, subbuf_size,
2727692a	494	n_subbufs);
900b24a9	495	break;
2727692a	496	case CTL_OP_DESTROY:
	497	ret = lttctl_destroy_trace(handle, trace_name);
	498	break;
	499	case CTL_OP_STOP_DESTROY:
	500	ret = lttctl_stop(handle, trace_name);
900b24a9	501	if(!ret)
900b24a9	502	ret = lttctl_destroy_trace(handle, trace_name);
2727692a	503	break;
	504	case CTL_OP_START:
	505	ret = lttctl_start(handle, trace_name);
	506	break;
	507	case CTL_OP_STOP:
	508	ret = lttctl_stop(handle, trace_name);
	509	break;
	510	case CTL_OP_DAEMON:
	511	ret = lttctl_daemon(handle, trace_name);
	512	break;
900b24a9	513	case CTL_OP_DESCRIPTION:
	514	ret = create_eventdefs();
	515	break;
2727692a	516	case CTL_OP_NONE:
	517	break;
	518	}
	519
	520	ret \|= lttctl_destroy_handle(handle);
	521
	522	return ret;
	523	}