+++ /dev/null
-/* liblttdutils
- *
- * Linux Trace Toolkit utility library
- *
- * This is a simple daemon implementation that reads a few relay+debugfs
- * channels and save them in a trace.
- *
- * CPU hot-plugging is supported using inotify.
- *
- * Copyright 2005 -
- * Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
- * Copyright 2010 -
- * Michael Sills-Lavoie <michael.sills-lavoie@polymtl.ca>
- * Oumarou Dicko <oumarou.dicko@polymtl.ca>
- */
-
-#ifdef HAVE_CONFIG_H
-#include <config.h>
-#endif
-
-#define _REENTRANT
-#define _GNU_SOURCE
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <dirent.h>
-#include <pthread.h>
-#include <sys/stat.h>
-
-#include "liblttdutils.h"
-
-struct liblttdutils_channel_data {
- int trace;
-};
-
-struct liblttdutils_data {
- char path_trace[PATH_MAX];
- char *end_path_trace;
- int path_trace_len;
- int append_mode;
- int verbose_mode;
-};
-
-static __thread int thread_pipe[2];
-
-#define printf_verbose(fmt, args...) \
- do { \
- if (callbacks_data->verbose_mode) \
- printf(fmt, ##args); \
- } while (0)
-
-int liblttdutils_local_on_open_channel(struct liblttd_callbacks *data, struct fd_pair *pair, char *relative_channel_path)
-{
- int open_ret = 0;
- int ret;
- struct stat stat_buf;
- struct liblttdutils_channel_data *channel_data;
-
- pair->user_data = malloc(sizeof(struct liblttdutils_channel_data));
- channel_data = pair->user_data;
-
- struct liblttdutils_data* callbacks_data = data->user_data;
-
- strncpy(callbacks_data->end_path_trace, relative_channel_path, PATH_MAX - callbacks_data->path_trace_len);
- printf_verbose("Creating trace file %s\n", callbacks_data->path_trace);
-
- ret = stat(callbacks_data->path_trace, &stat_buf);
- if(ret == 0) {
- if(callbacks_data->append_mode) {
- printf_verbose("Appending to file %s as requested\n",
- callbacks_data->path_trace);
-
- channel_data->trace = open(callbacks_data->path_trace, O_WRONLY, S_IRWXU|S_IRWXG|S_IRWXO);
- if(channel_data->trace == -1) {
- perror(callbacks_data->path_trace);
- open_ret = -1;
- goto end;
- }
- ret = lseek(channel_data->trace, 0, SEEK_END);
- if (ret < 0) {
- perror(callbacks_data->path_trace);
- open_ret = -1;
- close(channel_data->trace);
- goto end;
- }
- } else {
- printf("File %s exists, cannot open. Try append mode.\n", callbacks_data->path_trace);
- open_ret = -1;
- goto end;
- }
- } else {
- if(errno == ENOENT) {
- channel_data->trace =
- open(callbacks_data->path_trace, O_WRONLY|O_CREAT|O_EXCL, S_IRWXU|S_IRWXG|S_IRWXO);
- if(channel_data->trace == -1) {
- perror(callbacks_data->path_trace);
- open_ret = -1;
- goto end;
- }
- }
- }
-
-end:
- return open_ret;
-
-}
-
-int liblttdutils_local_on_close_channel(struct liblttd_callbacks *data, struct fd_pair *pair)
-{
- int ret;
- ret = close(((struct liblttdutils_channel_data *)(pair->user_data))->trace);
- free(pair->user_data);
- return ret;
-}
-
-int liblttdutils_local_on_new_channels_folder(struct liblttd_callbacks *data, char *relative_folder_path)
-{
- int ret;
- int open_ret = 0;
- struct liblttdutils_data* callbacks_data = data->user_data;
-
- strncpy(callbacks_data->end_path_trace, relative_folder_path, PATH_MAX - callbacks_data->path_trace_len);
- printf_verbose("Creating trace subdirectory %s\n", callbacks_data->path_trace);
-
- ret = mkdir(callbacks_data->path_trace, S_IRWXU|S_IRWXG|S_IRWXO);
- if(ret == -1) {
- if(errno != EEXIST) {
- perror(callbacks_data->path_trace);
- open_ret = -1;
- goto end;
- }
- }
-
-end:
- return open_ret;
-}
-
-int liblttdutils_local_on_read_subbuffer(struct liblttd_callbacks *data, struct fd_pair *pair, unsigned int len)
-{
- long ret;
- off_t offset = 0;
-
- struct liblttdutils_data* callbacks_data = data->user_data;
-
- while (len > 0) {
- printf_verbose("splice chan to pipe offset %lu\n",
- (unsigned long)offset);
- ret = splice(pair->channel, &offset, thread_pipe[1], NULL,
- len, SPLICE_F_MOVE | SPLICE_F_MORE);
- printf_verbose("splice chan to pipe ret %ld\n", ret);
- if (ret < 0) {
- perror("Error in relay splice");
- goto write_error;
- }
- ret = splice(thread_pipe[0], NULL,
- ((struct liblttdutils_channel_data *)(pair->user_data))->trace,
- NULL, ret, SPLICE_F_MOVE | SPLICE_F_MORE);
- printf_verbose("splice pipe to file %ld\n", ret);
- if (ret < 0) {
- perror("Error in file splice");
- goto write_error;
- }
- len -= ret;
- }
-
-write_error:
- return ret;
-}
-
-int liblttdutils_local_on_new_thread(struct liblttd_callbacks *data, unsigned long thread_num)
-{
- int ret;
- ret = pipe(thread_pipe);
- if (ret < 0) {
- perror("Error creating pipe");
- return ret;
- }
- return 0;
-}
-
-int liblttdutils_local_on_close_thread(struct liblttd_callbacks *data, unsigned long thread_num)
-{
- close(thread_pipe[0]); /* close read end */
- close(thread_pipe[1]); /* close write end */
- return 0;
-}
-
-int liblttdutils_local_on_trace_end(struct liblttd_instance *instance)
-{
- struct liblttd_callbacks *callbacks = instance->callbacks;
- struct liblttdutils_data *data = callbacks->user_data;
-
- free(data);
- free(callbacks);
-}
-
-struct liblttd_callbacks* liblttdutils_local_new_callbacks(char* trace_name,
- int append_mode, int verbose_mode)
-{
- struct liblttdutils_data *data;
- struct liblttd_callbacks *callbacks;
-
- if(!trace_name) return NULL;
-
- data = malloc(sizeof(struct liblttdutils_data));
-
- strncpy(data->path_trace, trace_name, PATH_MAX-1);
- data->path_trace_len = strlen(data->path_trace);
- data->end_path_trace = data->path_trace + data->path_trace_len;
- data->append_mode = append_mode;
- data->verbose_mode = verbose_mode;
-
- callbacks = malloc(sizeof(struct liblttd_callbacks));
-
- callbacks->on_open_channel = liblttdutils_local_on_open_channel;
- callbacks->on_close_channel = liblttdutils_local_on_close_channel;
- callbacks->on_new_channels_folder = liblttdutils_local_on_new_channels_folder;
- callbacks->on_read_subbuffer = liblttdutils_local_on_read_subbuffer;
- callbacks->on_trace_end = liblttdutils_local_on_trace_end;
- callbacks->on_new_thread = liblttdutils_local_on_new_thread;
- callbacks->on_close_thread = liblttdutils_local_on_close_thread;
- callbacks->user_data = data;
-
- return callbacks;
-}
-
projects / ltt-control.git / blobdiff