--- /dev/null
+/* 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 *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("-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;
+ 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, 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, 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;
+}
projects / ltt-control.git / blobdiff