[lttv.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();

    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;
    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
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
5cec0a15	15	#include <liblttctl/lttctl.h>
5adba60f	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. */
2312de30	28	#define BUF_SIZE 4096
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;
313b3771	43	static char *trace_type = "relay";
5adba60f	44	static char *mode_name = NULL;
988614ed	45	static unsigned subbuf_size = 0;
988614ed	46	static unsigned n_subbufs = 0;
45653836	47	static unsigned append_trace = 0;
5adba60f	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;
22acb617	52	static char *num_threads = "1";
5adba60f	53
86a65fdb	54	static int sigchld_received = 0;
ada84671	55
86a65fdb	56	void sigchld_handler(int signo)
5adba60f	57	{
5adba60f	58	printf("signal %d received\n", signo);
86a65fdb	59	sigchld_received = 1;
5adba60f	60	}
	61
	62
	63	/* Args :
	64	*
	65	*/
	66	void show_arguments(void)
	67	{
	68	printf("Please use the following arguments :\n");
	69	printf("\n");
	70	printf("-n name Name of the trace.\n");
b7f08766	71	printf("-b Create trace channels and start tracing (no daemon).\n");
bc0fcb31	72	printf("-c Create trace channels.\n");
bc0fcb31	73	printf("-m mode Normal or flight recorder mode.\n");
5adba60f	74	printf(" Mode values : normal (default) or flight.\n");
5adba60f	75	printf("-r Destroy trace channels.\n");
b7f08766	76	printf("-R Stop tracing and destroy trace channels.\n");
5adba60f	77	printf("-s Start tracing.\n");
	78	//printf(" Note : will automatically create a normal trace if "
	79	// "none exists.\n");
	80	printf("-q Stop tracing.\n");
	81	printf("-d Create trace, spawn a lttd daemon, start tracing.\n");
d5fbdb60	82	printf(" (optionnaly, you can set LTT_DAEMON\n");
d5fbdb60	83	printf(" and the LTT_FACILITIES env. vars.)\n");
5adba60f	84	printf("-t Trace root path. (ex. /root/traces/example_trace)\n");
313b3771	85	printf("-T Type of trace (ex. relay)\n");
5adba60f	86	printf("-l LTT channels root path. (ex. /mnt/relayfs/ltt)\n");
4085af66	87	printf("-z Size of the subbuffers (will be rounded to next page size)\n");
988614ed	88	printf("-x Number of subbuffers\n");
129fd24a	89	printf("-e Get XML facilities description\n");
45653836	90	printf("-a Append to trace\n");
b8d28629	91	printf("-N Number of lttd threads\n");
5adba60f	92	printf("\n");
	93	}
	94
	95
	96	/* parse_arguments
	97	*
	98	* Parses the command line arguments.
	99	*
2baf08e5	100	* Returns -1 if the arguments were correct, but doesn't ask for program
2baf08e5	101	* continuation. Returns EINVAL if the arguments are incorrect, or 0 if OK.
5adba60f	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) {
2baf08e5	110	return -1;
5adba60f	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 {
8eab4866	124	printf("Specify a trace name after -n.\n");
5adba60f	125	printf("\n");
2baf08e5	126	ret = EINVAL;
5adba60f	127	}
	128
	129	break;
b7f08766	130	case 'b':
b7f08766	131	op = CTL_OP_CREATE_START;
cd39bb61	132	break;
5adba60f	133	case 'c':
5adba60f	134	op = CTL_OP_CREATE;
bc0fcb31	135	break;
bc0fcb31	136	case 'm':
5adba60f	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");
2baf08e5	147	ret = EINVAL;
5adba60f	148	}
5adba60f	149	} else {
bc0fcb31	150	printf("Specify a mode after -m.\n");
5adba60f	151	printf("\n");
2baf08e5	152	ret = EINVAL;
5adba60f	153	}
	154	break;
	155	case 'r':
	156	op = CTL_OP_DESTROY;
	157	break;
b7f08766	158	case 'R':
	159	op = CTL_OP_STOP_DESTROY;
	160	break;
5adba60f	161	case 's':
	162	op = CTL_OP_START;
	163	break;
	164	case 'q':
	165	op = CTL_OP_STOP;
	166	break;
988614ed	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");
2baf08e5	174	ret = EINVAL;
988614ed	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");
2baf08e5	184	ret = EINVAL;
988614ed	185	}
988614ed	186	break;
5adba60f	187	case 'd':
	188	op = CTL_OP_DAEMON;
	189	break;
129fd24a	190	case 'e':
	191	op = CTL_OP_DESCRIPTION;
	192	break;
5adba60f	193	case 't':
	194	if(argn+1 < argc) {
	195	trace_root = argv[argn+1];
	196	argn++;
	197	} else {
988614ed	198	printf("Specify a trace root path after -t.\n");
5adba60f	199	printf("\n");
2baf08e5	200	ret = EINVAL;
5adba60f	201	}
	202	break;
	203	case 'l':
	204	if(argn+1 < argc) {
	205	channel_root = argv[argn+1];
	206	argn++;
	207	} else {
988614ed	208	printf("Specify a channel root path after -l.\n");
5adba60f	209	printf("\n");
2baf08e5	210	ret = EINVAL;
5adba60f	211	}
5adba60f	212	break;
45653836	213	case 'a':
	214	append_trace = 1;
	215	break;
22acb617	216	case 'N':
	217	if(argn+1 < argc) {
	218	num_threads = argv[argn+1];
	219	argn++;
	220	}
	221	break;
313b3771	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;
5adba60f	232	default:
	233	printf("Invalid argument '%s'.\n", argv[argn]);
	234	printf("\n");
2baf08e5	235	ret = EINVAL;
5adba60f	236	}
	237	break;
	238	default:
	239	printf("Invalid argument '%s'.\n", argv[argn]);
	240	printf("\n");
2baf08e5	241	ret = EINVAL;
5adba60f	242	}
	243	argn++;
	244	}
	245
129fd24a	246	if(op != CTL_OP_DESCRIPTION && trace_name == NULL) {
5adba60f	247	printf("Please specify a trace name.\n");
5adba60f	248	printf("\n");
2baf08e5	249	ret = EINVAL;
5adba60f	250	}
	251
	252	if(op == CTL_OP_NONE) {
	253	printf("Please specify an operation.\n");
	254	printf("\n");
2baf08e5	255	ret = EINVAL;
5adba60f	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");
2baf08e5	262	ret = EINVAL;
5adba60f	263	}
	264	if(channel_root == NULL) {
	265	printf("Please specify -l ltt_root_path with the -d option.\n");
	266	printf("\n");
2baf08e5	267	ret = EINVAL;
5adba60f	268	}
	269	}
	270
129fd24a	271	if(op == CTL_OP_DESCRIPTION) {
	272	if(trace_root == NULL) {
	273	printf("Please specify -t trace_root_path with the -e option.\n");
	274	printf("\n");
2baf08e5	275	ret = EINVAL;
129fd24a	276	}
	277	}
	278
5adba60f	279	return ret;
	280	}
	281
	282	void show_info(void)
	283	{
	284	printf("Linux Trace Toolkit Trace Control\n");
	285	printf("\n");
129fd24a	286	if(trace_name != NULL) {
	287	printf("Controlling trace : %s\n", trace_name);
	288	printf("\n");
	289	}
	290	}
	291
	292	int create_eventdefs(void)
	293	{
	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;
	300	char *facilities_path = getenv("LTT_FACILITIES");
	301	if(facilities_path == NULL) facilities_path =
86a65fdb	302	PACKAGE_DATA_DIR "/" PACKAGE "/facilities";
129fd24a	303
	304	ret = mkdir(trace_root, S_IRWXU\|S_IRWXG\|S_IRWXO);
	305	if(ret == -1 && errno != EEXIST) {
618fbcc1	306	ret = errno;
129fd24a	307	perror("Cannot create trace_root directory");
	308	printf("trace_root is %s\n", trace_root);
	309	goto error;
	310	}
bd55296c	311	ret = 0;
129fd24a	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);
45653836	318	if(ret == -1 && (!append_trace \|\| errno != EEXIST)) {
2baf08e5	319	ret = errno;
618fbcc1	320	perror("Cannot create eventdefs directory");
129fd24a	321	goto error;
129fd24a	322	}
bd55296c	323	ret = 0;
129fd24a	324
	325	DIR *facilities_dir = opendir(facilities_path);
	326
86a65fdb	327	if(facilities_dir == NULL) {
86a65fdb	328	perror("Cannot open facilities directory");
2baf08e5	329	ret = EEXIST;
86a65fdb	330	goto error;
	331	}
	332
129fd24a	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) {
2baf08e5	351	ret = errno;
618fbcc1	352	perror("Cannot open eventdefs file for reading");
129fd24a	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)) {
2baf08e5	360	ret = errno;
618fbcc1	361	perror("Cannot read eventdefs file");
129fd24a	362	goto close_src;
	363	}
	364	write_size = fwrite(read_buf, sizeof(char), read_size, dest);
	365	if(ferror(dest)) {
2baf08e5	366	ret = errno;
618fbcc1	367	perror("Cannot write eventdefs file");
129fd24a	368	goto close_src;
	369	}
	370	} while(!feof(src));
	371
	372	/* Add spacing between facilities */
	373	fwrite("\n", 1, 1, dest);
	374
	375	close_src:
	376	fclose(src);
	377	close_dest:
	378	fclose(dest);
	379	}
	380
	381	closedir(facilities_dir);
	382
86a65fdb	383	error:
129fd24a	384	return ret;
129fd24a	385
5adba60f	386	}
5adba60f	387
129fd24a	388
5adba60f	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
86a65fdb	397	if(lttd_path == NULL) lttd_path =
86a65fdb	398	PACKAGE_BIN_DIR "/lttd";
5adba60f	399
	400	strcat(channel_path, channel_root);
	401	strcat(channel_path, "/");
	402	strcat(channel_path, trace_name);
	403
	404
313b3771	405	ret = lttctl_create_trace(handle, trace_name, mode, trace_type, subbuf_size, n_subbufs);
5adba60f	406	if(ret != 0) goto create_error;
5adba60f	407
86a65fdb	408	act.sa_handler = sigchld_handler;
5adba60f	409	sigemptyset(&(act.sa_mask));
86a65fdb	410	sigaddset(&(act.sa_mask), SIGCHLD);
86a65fdb	411	sigaction(SIGCHLD, &act, NULL);
ada84671	412
5adba60f	413	pid = fork();
	414
	415	if(pid > 0) {
86a65fdb	416	int status;
5adba60f	417	/* parent */
86a65fdb	418	while(!(sigchld_received)) pause();
	419
	420	waitpid(pid, &status, 0);
	421	ret = 0;
	422	if(WIFEXITED(status))
	423	ret = WEXITSTATUS(status);
	424	if(ret) goto start_error;
5adba60f	425
5adba60f	426	printf("Creating supplementary trace files\n");
129fd24a	427	ret = create_eventdefs();
129fd24a	428	if(ret) goto start_error;
5adba60f	429
	430	} else if(pid == 0) {
	431	/* child */
45653836	432	int ret;
	433	if(append_trace)
	434	ret = execlp(lttd_path, lttd_path, "-t", trace_root, "-c",
22acb617	435	channel_path, "-d", "-a", "-N", num_threads, NULL);
45653836	436	else
45653836	437	ret = execlp(lttd_path, lttd_path, "-t", trace_root, "-c",
22acb617	438	channel_path, "-d", "-N", num_threads, NULL);
5adba60f	439	if(ret) {
618fbcc1	440	ret = errno;
5adba60f	441	perror("Error in executing the lttd daemon");
618fbcc1	442	exit(ret);
5adba60f	443	}
	444	} else {
	445	/* error */
	446	perror("Error in forking for lttd daemon");
5adba60f	447	}
	448
	449	ret = lttctl_start(handle, trace_name);
	450	if(ret != 0) goto start_error;
	451
	452	return 0;
	453
	454	/* error handling */
	455	start_error:
86a65fdb	456	printf("Trace start error\n");
5adba60f	457	ret \|= lttctl_destroy_trace(handle, trace_name);
	458	create_error:
	459	return ret;
	460	}
	461
	462	int main(int argc, char ** argv)
	463	{
	464	int ret;
	465	struct lttctl_handle *handle;
	466
	467	ret = parse_arguments(argc, argv);
	468
	469	if(ret != 0) show_arguments();
2baf08e5	470	if(ret == EINVAL) return EINVAL;
2baf08e5	471	if(ret == -1) return 0;
5adba60f	472
	473	show_info();
	474
	475	handle = lttctl_create_handle();
	476
	477	if(handle == NULL) return -1;
	478
	479	switch(op) {
b7f08766	480	case CTL_OP_CREATE_START:
313b3771	481	ret = lttctl_create_trace(handle, trace_name, mode, trace_type, subbuf_size,
b7f08766	482	n_subbufs);
	483	if(!ret)
	484	ret = lttctl_start(handle, trace_name);
	485	break;
5adba60f	486	case CTL_OP_CREATE:
313b3771	487	ret = lttctl_create_trace(handle, trace_name, mode, trace_type, subbuf_size,
988614ed	488	n_subbufs);
24ba6df0	489	break;
5adba60f	490	case CTL_OP_DESTROY:
	491	ret = lttctl_destroy_trace(handle, trace_name);
	492	break;
b7f08766	493	case CTL_OP_STOP_DESTROY:
	494	ret = lttctl_stop(handle, trace_name);
	495	if(!ret)
	496	ret = lttctl_destroy_trace(handle, trace_name);
	497	break;
5adba60f	498	case CTL_OP_START:
	499	ret = lttctl_start(handle, trace_name);
	500	break;
	501	case CTL_OP_STOP:
	502	ret = lttctl_stop(handle, trace_name);
	503	break;
	504	case CTL_OP_DAEMON:
	505	ret = lttctl_daemon(handle, trace_name);
	506	break;
129fd24a	507	case CTL_OP_DESCRIPTION:
	508	ret = create_eventdefs();
	509	break;
5adba60f	510	case CTL_OP_NONE:
	511	break;
	512	}
	513
	514	ret \|= lttctl_destroy_handle(handle);
	515
	516	return ret;
	517	}