[lttv.git] / ltt / branches / poly / 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 <libltt/libltt.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 4194304

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 *mode_name = NULL;
static unsigned subbuf_size = 0;
static unsigned n_subbufs = 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 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("-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("\n");
}


/* parse_arguments
 *
 * Parses the command line arguments.
 *
 * Returns 1 if the arguments were correct, but doesn't ask for program
 * continuation. Returns -1 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", argv[argn]);
							printf("\n");
							ret = -1;
						}

						break;
          case 'b':
            op = CTL_OP_CREATE_START;
					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 = -1;
							}
						} else {
								printf("Specify a mode after -m.\n");
								printf("\n");
								ret = -1;
						}
						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 = -1;
						}
						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 = -1;
						}
						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 = -1;
						}
						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 = -1;
						}
						break;
					default:
						printf("Invalid argument '%s'.\n", argv[argn]);
						printf("\n");
						ret = -1;
				}
				break;
			default:
				printf("Invalid argument '%s'.\n", argv[argn]);
				printf("\n");
				ret = -1;
		}
		argn++;
	}
	
	if(op != CTL_OP_DESCRIPTION && trace_name == NULL) {
		printf("Please specify a trace name.\n");
		printf("\n");
		ret = -1;
	}

	if(op == CTL_OP_NONE) {
		printf("Please specify an operation.\n");
		printf("\n");
		ret = -1;
	}

	if(op == CTL_OP_DAEMON) {
		if(trace_root == NULL) {
			printf("Please specify -t trace_root_path with the -d option.\n");
			printf("\n");
			ret = -1;
		}
		if(channel_root == NULL) {
			printf("Please specify -l ltt_root_path with the -d option.\n");
			printf("\n");
			ret = -1;
		}
	}

  if(op == CTL_OP_DESCRIPTION) {
    if(trace_root == NULL) {
			printf("Please specify -t trace_root_path with the -e option.\n");
			printf("\n");
			ret = -1;
    }
  }

	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) {
    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 && errno != EEXIST) {
    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 = -1;
    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) {
      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)) {
        perror("Cannot read eventdefs file");
        goto close_src;
      }
      write_size = fwrite(read_buf, sizeof(char), read_size, dest);
      if(ferror(dest)) {
        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, 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();

    waitpid(pid, &status, 0);
    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 =	execlp(lttd_path, lttd_path, "-t", trace_root, "-c",
                     channel_path, "-d", NULL);
		if(ret) {
			perror("Error in executing the lttd daemon");
			exit(-1);
		}
	} 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 < 0) return EINVAL;
	if(ret > 0) 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, 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, 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
2cdb6fcb	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
4e4d11b3	11	#ifdef HAVE_CONFIG_H
	12	#include <config.h>
	13	#endif
	14
5adba60f	15	#include <libltt/libltt.h>
	16	#include <errno.h>
	17	#include <stdio.h>
	18	#include <stdlib.h>
	19	#include <sys/types.h>
86a65fdb	20	#include <sys/wait.h>
5adba60f	21	#include <unistd.h>
5adba60f	22	#include <signal.h>
d5fbdb60	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 4194304
2cdb6fcb	29
5adba60f	30	enum trace_ctl_op {
b7f08766	31	CTL_OP_CREATE_START,
5adba60f	32	CTL_OP_CREATE,
5adba60f	33	CTL_OP_DESTROY,
b7f08766	34	CTL_OP_STOP_DESTROY,
5adba60f	35	CTL_OP_START,
	36	CTL_OP_STOP,
	37	CTL_OP_DAEMON,
129fd24a	38	CTL_OP_DESCRIPTION,
5adba60f	39	CTL_OP_NONE
5adba60f	40	};
2cdb6fcb	41
5adba60f	42	static char *trace_name = NULL;
5adba60f	43	static char *mode_name = NULL;
988614ed	44	static unsigned subbuf_size = 0;
988614ed	45	static unsigned n_subbufs = 0;
5adba60f	46	static enum trace_mode mode = LTT_TRACE_NORMAL;
	47	static enum trace_ctl_op op = CTL_OP_NONE;
	48	static char *channel_root = NULL;
	49	static char *trace_root = NULL;
	50
86a65fdb	51	static int sigchld_received = 0;
ada84671	52
86a65fdb	53	void sigchld_handler(int signo)
5adba60f	54	{
5adba60f	55	printf("signal %d received\n", signo);
86a65fdb	56	sigchld_received = 1;
5adba60f	57	}
	58
	59
	60	/* Args :
	61	*
	62	*/
	63	void show_arguments(void)
	64	{
	65	printf("Please use the following arguments :\n");
	66	printf("\n");
	67	printf("-n name Name of the trace.\n");
b7f08766	68	printf("-b Create trace channels and start tracing (no daemon).\n");
bc0fcb31	69	printf("-c Create trace channels.\n");
bc0fcb31	70	printf("-m mode Normal or flight recorder mode.\n");
5adba60f	71	printf(" Mode values : normal (default) or flight.\n");
5adba60f	72	printf("-r Destroy trace channels.\n");
b7f08766	73	printf("-R Stop tracing and destroy trace channels.\n");
5adba60f	74	printf("-s Start tracing.\n");
	75	//printf(" Note : will automatically create a normal trace if "
	76	// "none exists.\n");
	77	printf("-q Stop tracing.\n");
	78	printf("-d Create trace, spawn a lttd daemon, start tracing.\n");
d5fbdb60	79	printf(" (optionnaly, you can set LTT_DAEMON\n");
d5fbdb60	80	printf(" and the LTT_FACILITIES env. vars.)\n");
5adba60f	81	printf("-t Trace root path. (ex. /root/traces/example_trace)\n");
5adba60f	82	printf("-l LTT channels root path. (ex. /mnt/relayfs/ltt)\n");
4085af66	83	printf("-z Size of the subbuffers (will be rounded to next page size)\n");
988614ed	84	printf("-x Number of subbuffers\n");
129fd24a	85	printf("-e Get XML facilities description\n");
5adba60f	86	printf("\n");
	87	}
	88
	89
	90	/* parse_arguments
	91	*
	92	* Parses the command line arguments.
	93	*
	94	* Returns 1 if the arguments were correct, but doesn't ask for program
	95	* continuation. Returns -1 if the arguments are incorrect, or 0 if OK.
	96	*/
	97	int parse_arguments(int argc, char **argv)
	98	{
	99	int ret = 0;
	100	int argn = 1;
	101
	102	if(argc == 2) {
	103	if(strcmp(argv[1], "-h") == 0) {
	104	return 1;
	105	}
	106	}
	107
	108	while(argn < argc) {
	109
	110	switch(argv[argn][0]) {
	111	case '-':
	112	switch(argv[argn][1]) {
	113	case 'n':
	114	if(argn+1 < argc) {
	115	trace_name = argv[argn+1];
	116	argn++;
	117	} else {
	118	printf("Specify a trace name after -n.\n", argv[argn]);
	119	printf("\n");
	120	ret = -1;
	121	}
	122
	123	break;
b7f08766	124	case 'b':
b7f08766	125	op = CTL_OP_CREATE_START;
5adba60f	126	case 'c':
5adba60f	127	op = CTL_OP_CREATE;
bc0fcb31	128	break;
bc0fcb31	129	case 'm':
5adba60f	130	if(argn+1 < argc) {
	131	mode_name = argv[argn+1];
	132	argn++;
	133	if(strcmp(mode_name, "normal") == 0)
	134	mode = LTT_TRACE_NORMAL;
	135	else if(strcmp(mode_name, "flight") == 0)
	136	mode = LTT_TRACE_FLIGHT;
	137	else {
	138	printf("Invalid mode '%s'.\n", argv[argn]);
	139	printf("\n");
	140	ret = -1;
	141	}
	142	} else {
bc0fcb31	143	printf("Specify a mode after -m.\n");
5adba60f	144	printf("\n");
	145	ret = -1;
	146	}
	147	break;
	148	case 'r':
	149	op = CTL_OP_DESTROY;
	150	break;
b7f08766	151	case 'R':
	152	op = CTL_OP_STOP_DESTROY;
	153	break;
5adba60f	154	case 's':
	155	op = CTL_OP_START;
	156	break;
	157	case 'q':
	158	op = CTL_OP_STOP;
	159	break;
988614ed	160	case 'z':
	161	if(argn+1 < argc) {
	162	subbuf_size = (unsigned)atoi(argv[argn+1]);
	163	argn++;
	164	} else {
	165	printf("Specify a number of subbuffers after -z.\n");
	166	printf("\n");
	167	ret = -1;
	168	}
	169	break;
	170	case 'x':
	171	if(argn+1 < argc) {
	172	n_subbufs = (unsigned)atoi(argv[argn+1]);
	173	argn++;
	174	} else {
	175	printf("Specify a subbuffer size after -x.\n");
	176	printf("\n");
	177	ret = -1;
	178	}
	179	break;
5adba60f	180	case 'd':
	181	op = CTL_OP_DAEMON;
	182	break;
129fd24a	183	case 'e':
	184	op = CTL_OP_DESCRIPTION;
	185	break;
5adba60f	186	case 't':
	187	if(argn+1 < argc) {
	188	trace_root = argv[argn+1];
	189	argn++;
	190	} else {
988614ed	191	printf("Specify a trace root path after -t.\n");
5adba60f	192	printf("\n");
	193	ret = -1;
	194	}
	195	break;
	196	case 'l':
	197	if(argn+1 < argc) {
	198	channel_root = argv[argn+1];
	199	argn++;
	200	} else {
988614ed	201	printf("Specify a channel root path after -l.\n");
5adba60f	202	printf("\n");
	203	ret = -1;
	204	}
	205	break;
	206	default:
	207	printf("Invalid argument '%s'.\n", argv[argn]);
	208	printf("\n");
	209	ret = -1;
	210	}
	211	break;
	212	default:
	213	printf("Invalid argument '%s'.\n", argv[argn]);
	214	printf("\n");
	215	ret = -1;
	216	}
	217	argn++;
	218	}
	219
129fd24a	220	if(op != CTL_OP_DESCRIPTION && trace_name == NULL) {
5adba60f	221	printf("Please specify a trace name.\n");
	222	printf("\n");
	223	ret = -1;
	224	}
	225
	226	if(op == CTL_OP_NONE) {
	227	printf("Please specify an operation.\n");
	228	printf("\n");
	229	ret = -1;
	230	}
	231
	232	if(op == CTL_OP_DAEMON) {
	233	if(trace_root == NULL) {
	234	printf("Please specify -t trace_root_path with the -d option.\n");
	235	printf("\n");
	236	ret = -1;
	237	}
	238	if(channel_root == NULL) {
	239	printf("Please specify -l ltt_root_path with the -d option.\n");
	240	printf("\n");
	241	ret = -1;
	242	}
	243	}
	244
129fd24a	245	if(op == CTL_OP_DESCRIPTION) {
	246	if(trace_root == NULL) {
	247	printf("Please specify -t trace_root_path with the -e option.\n");
	248	printf("\n");
	249	ret = -1;
	250	}
	251	}
	252
5adba60f	253	return ret;
	254	}
	255
	256	void show_info(void)
	257	{
	258	printf("Linux Trace Toolkit Trace Control\n");
	259	printf("\n");
129fd24a	260	if(trace_name != NULL) {
	261	printf("Controlling trace : %s\n", trace_name);
	262	printf("\n");
	263	}
	264	}
	265
	266	int create_eventdefs(void)
	267	{
	268	int ret = 0;
	269	char eventdefs_path[PATH_MAX];
	270	char eventdefs_file[PATH_MAX];
	271	char facilities_file[PATH_MAX];
	272	char read_buf[BUF_SIZE];
	273	struct dirent *entry;
	274	char *facilities_path = getenv("LTT_FACILITIES");
	275	if(facilities_path == NULL) facilities_path =
86a65fdb	276	PACKAGE_DATA_DIR "/" PACKAGE "/facilities";
129fd24a	277
	278	ret = mkdir(trace_root, S_IRWXU\|S_IRWXG\|S_IRWXO);
	279	if(ret == -1 && errno != EEXIST) {
	280	perror("Cannot create trace_root directory");
	281	printf("trace_root is %s\n", trace_root);
	282	goto error;
	283	}
bd55296c	284	ret = 0;
129fd24a	285
	286	size_t trace_root_len = strlen(trace_root);
	287	strncpy(eventdefs_path, trace_root, PATH_MAX);
	288	strncat(eventdefs_path, "/eventdefs/", PATH_MAX - trace_root_len);
	289	size_t eventdefs_path_len = strlen(eventdefs_path);
	290	ret = mkdir(eventdefs_path, S_IRWXU\|S_IRWXG\|S_IRWXO);
	291	if(ret == -1 && errno != EEXIST) {
	292	perror("Cannot create eventdefs directory");
	293	goto error;
	294	}
bd55296c	295	ret = 0;
129fd24a	296
	297	DIR *facilities_dir = opendir(facilities_path);
	298
86a65fdb	299	if(facilities_dir == NULL) {
	300	perror("Cannot open facilities directory");
	301	ret = -1;
	302	goto error;
	303	}
	304
129fd24a	305	while((entry = readdir(facilities_dir)) != NULL) {
	306	if(entry->d_name[0] == '.') continue;
	307
	308	printf("Appending facility file %s\n", entry->d_name);
	309	strncpy(eventdefs_file, eventdefs_path, PATH_MAX);
	310	strncat(eventdefs_file, entry->d_name, PATH_MAX - eventdefs_path_len);
	311	/* Append to the file */
	312	FILE *dest = fopen(eventdefs_file, "a");
	313	if(!dest) {
	314	perror("Cannot create eventdefs file");
	315	continue;
	316	}
	317	strncpy(facilities_file, facilities_path, PATH_MAX);
	318	size_t facilities_dir_len = strlen(facilities_path);
	319	strncat(facilities_file, "/", PATH_MAX - facilities_dir_len);
	320	strncat(facilities_file, entry->d_name, PATH_MAX - facilities_dir_len-1);
	321	FILE *src = fopen(facilities_file, "r");
	322	if(!src) {
	323	perror("Cannot open eventdefs file for reading");
	324	goto close_dest;
	325	}
	326
	327	do {
	328	size_t read_size, write_size;
	329	read_size = fread(read_buf, sizeof(char), BUF_SIZE, src);
	330	if(ferror(src)) {
	331	perror("Cannot read eventdefs file");
	332	goto close_src;
	333	}
	334	write_size = fwrite(read_buf, sizeof(char), read_size, dest);
	335	if(ferror(dest)) {
	336	perror("Cannot write eventdefs file");
	337	goto close_src;
	338	}
	339	} while(!feof(src));
	340
	341	/* Add spacing between facilities */
	342	fwrite("\n", 1, 1, dest);
	343
	344	close_src:
	345	fclose(src);
	346	close_dest:
	347	fclose(dest);
	348	}
	349
	350	closedir(facilities_dir);
	351
86a65fdb	352	error:
129fd24a	353	return ret;
129fd24a	354
5adba60f	355	}
5adba60f	356
129fd24a	357
5adba60f	358	int lttctl_daemon(struct lttctl_handle handle, char trace_name)
	359	{
	360	char channel_path[PATH_MAX] = "";
	361	pid_t pid;
	362	int ret;
	363	char *lttd_path = getenv("LTT_DAEMON");
	364	struct sigaction act;
	365
86a65fdb	366	if(lttd_path == NULL) lttd_path =
86a65fdb	367	PACKAGE_BIN_DIR "/lttd";
5adba60f	368
	369	strcat(channel_path, channel_root);
	370	strcat(channel_path, "/");
	371	strcat(channel_path, trace_name);
	372
	373
988614ed	374	ret = lttctl_create_trace(handle, trace_name, mode, subbuf_size, n_subbufs);
5adba60f	375	if(ret != 0) goto create_error;
5adba60f	376
86a65fdb	377	act.sa_handler = sigchld_handler;
5adba60f	378	sigemptyset(&(act.sa_mask));
86a65fdb	379	sigaddset(&(act.sa_mask), SIGCHLD);
86a65fdb	380	sigaction(SIGCHLD, &act, NULL);
ada84671	381
5adba60f	382	pid = fork();
	383
	384	if(pid > 0) {
86a65fdb	385	int status;
5adba60f	386	/* parent */
86a65fdb	387	while(!(sigchld_received)) pause();
	388
	389	waitpid(pid, &status, 0);
	390	ret = 0;
	391	if(WIFEXITED(status))
	392	ret = WEXITSTATUS(status);
	393	if(ret) goto start_error;
5adba60f	394
5adba60f	395	printf("Creating supplementary trace files\n");
129fd24a	396	ret = create_eventdefs();
129fd24a	397	if(ret) goto start_error;
5adba60f	398
	399	} else if(pid == 0) {
	400	/* child */
86a65fdb	401
	402	int ret = execlp(lttd_path, lttd_path, "-t", trace_root, "-c",
	403	channel_path, "-d", NULL);
5adba60f	404	if(ret) {
	405	perror("Error in executing the lttd daemon");
	406	exit(-1);
	407	}
	408	} else {
	409	/* error */
	410	perror("Error in forking for lttd daemon");
	411
	412	}
	413
	414	ret = lttctl_start(handle, trace_name);
	415	if(ret != 0) goto start_error;
	416
	417	return 0;
	418
	419	/* error handling */
	420	start_error:
86a65fdb	421	printf("Trace start error\n");
5adba60f	422	ret \|= lttctl_destroy_trace(handle, trace_name);
	423	create_error:
	424	return ret;
	425	}
	426
	427	int main(int argc, char ** argv)
	428	{
	429	int ret;
	430	struct lttctl_handle *handle;
	431
	432	ret = parse_arguments(argc, argv);
	433
	434	if(ret != 0) show_arguments();
	435	if(ret < 0) return EINVAL;
	436	if(ret > 0) return 0;
	437
	438	show_info();
	439
	440	handle = lttctl_create_handle();
	441
	442	if(handle == NULL) return -1;
	443
	444	switch(op) {
b7f08766	445	case CTL_OP_CREATE_START:
	446	ret = lttctl_create_trace(handle, trace_name, mode, subbuf_size,
	447	n_subbufs);
	448	if(!ret)
	449	ret = lttctl_start(handle, trace_name);
	450	break;
5adba60f	451	case CTL_OP_CREATE:
988614ed	452	ret = lttctl_create_trace(handle, trace_name, mode, subbuf_size,
988614ed	453	n_subbufs);
24ba6df0	454	break;
5adba60f	455	case CTL_OP_DESTROY:
	456	ret = lttctl_destroy_trace(handle, trace_name);
	457	break;
b7f08766	458	case CTL_OP_STOP_DESTROY:
	459	ret = lttctl_stop(handle, trace_name);
	460	if(!ret)
	461	ret = lttctl_destroy_trace(handle, trace_name);
	462	break;
5adba60f	463	case CTL_OP_START:
	464	ret = lttctl_start(handle, trace_name);
	465	break;
	466	case CTL_OP_STOP:
	467	ret = lttctl_stop(handle, trace_name);
	468	break;
	469	case CTL_OP_DAEMON:
	470	ret = lttctl_daemon(handle, trace_name);
	471	break;
129fd24a	472	case CTL_OP_DESCRIPTION:
	473	ret = create_eventdefs();
	474	break;
5adba60f	475	case CTL_OP_NONE:
	476	break;
	477	}
	478
	479	ret \|= lttctl_destroy_handle(handle);
	480
	481	return ret;
	482	}