* 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 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;
-void handler(int signo)
+static int sigchld_received = 0;
+
+void sigchld_handler(int signo)
{
printf("signal %d received\n", signo);
+ sigchld_received = 1;
}
printf("Please use the following arguments :\n");
printf("\n");
printf("-n name Name of the trace.\n");
- printf("-c mode Create trace channels in mode normal or flight recorder.\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 env. var.)\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("-a Append to trace\n");
printf("\n");
}
}
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++;
ret = -1;
}
} else {
- printf("Specify a mode after -c.\n", argv[argn]);
+ printf("Specify a mode after -m.\n");
printf("\n");
ret = -1;
}
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", argv[argn]);
+ printf("Specify a trace root path after -t.\n");
printf("\n");
ret = -1;
}
channel_root = argv[argn+1];
argn++;
} else {
- printf("Specify a channel root path after -l.\n", argv[argn]);
+ printf("Specify a channel root path after -l.\n");
printf("\n");
ret = -1;
}
break;
+ case 'a':
+ append_trace = 1;
+ break;
default:
printf("Invalid argument '%s'.\n", argv[argn]);
printf("\n");
argn++;
}
- if(trace_name == NULL) {
+ if(op != CTL_OP_DESCRIPTION && trace_name == NULL) {
printf("Please specify a trace name.\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;
}
{
printf("Linux Trace Toolkit Trace Control\n");
printf("\n");
- printf("Controlling trace : %s\n", trace_name);
- 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 && (!append_trace || 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] = "";
char *lttd_path = getenv("LTT_DAEMON");
struct sigaction act;
- if(lttd_path == NULL) lttd_path = "lttd";
+ 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);
+ ret = lttctl_create_trace(handle, trace_name, mode, subbuf_size, n_subbufs);
if(ret != 0) goto create_error;
- act.sa_handler = handler;
+ act.sa_handler = sigchld_handler;
sigemptyset(&(act.sa_mask));
- sigaddset(&(act.sa_mask), SIGIO);
- sigaction(SIGIO, &act, NULL);
+ sigaddset(&(act.sa_mask), SIGCHLD);
+ sigaction(SIGCHLD, &act, NULL);
pid = fork();
if(pid > 0) {
- //sleep(1);
+ int status;
/* parent */
- pause();
+ while(!(sigchld_received)) pause();
+
+ waitpid(pid, &status, 0);
+ ret = 0;
+ if(WIFEXITED(status))
+ ret = WEXITSTATUS(status);
+ if(ret) goto start_error;
- /* Now the trace is created, go on and create the supplementary files... */
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, "-s", NULL);
+ int ret;
+ if(append_trace)
+ ret = execlp(lttd_path, lttd_path, "-t", trace_root, "-c",
+ channel_path, "-d", "-a", NULL);
+ else
+ 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);
/* error handling */
start_error:
+ printf("Trace start error\n");
ret |= lttctl_destroy_trace(handle, trace_name);
create_error:
return ret;
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);
- break;
+ 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_DAEMON:
ret = lttctl_daemon(handle, trace_name);
break;
+ case CTL_OP_DESCRIPTION:
+ ret = create_eventdefs();
+ break;
case CTL_OP_NONE:
break;
}
projects / lttv.git / blobdiff