- unsigned long offset = 0;
- unsigned long head = 0;
- struct stat stat;
- char *buf;
- event_t *event;
- int ret, rc = EXIT_FAILURE;
- uint32_t size;
- unsigned long total = 0, total_mmap = 0, total_comm = 0, total_unknown = 0;
- char cwd[PATH_MAX], *cwdp = cwd;
- int cwdlen;
-
- register_idle_thread();
-
- input = open(input_name, O_RDONLY);
- if (input < 0) {
- perror("failed to open file");
- exit(-1);
- }
-
- ret = fstat(input, &stat);
- if (ret < 0) {
- perror("failed to stat file");
- exit(-1);
- }
-
- if (!stat.st_size) {
- fprintf(stderr, "zero-sized file, nothing to do!\n");
- exit(0);
- }
-
- if (load_kernel() < 0) {
- perror("failed to load kernel symbols");
- return EXIT_FAILURE;
- }
-
- if (!full_paths) {
- if (getcwd(cwd, sizeof(cwd)) == NULL) {
- perror("failed to get the current directory");
- return EXIT_FAILURE;
- }
- cwdlen = strlen(cwd);
- } else {
- cwdp = NULL;
- cwdlen = 0;
- }
-remap:
- buf = (char *)mmap(NULL, page_size * mmap_window, PROT_READ,
- MAP_SHARED, input, offset);
- if (buf == MAP_FAILED) {
- perror("failed to mmap file");
- exit(-1);
- }
-
-more:
- event = (event_t *)(buf + head);
-
- size = event->header.size;
- if (!size)
- size = 8;
-
- if (head + event->header.size >= page_size * mmap_window) {
- unsigned long shift = page_size * (head / page_size);
- int ret;
-
- ret = munmap(buf, page_size * mmap_window);
- assert(ret == 0);
-
- offset += shift;
- head -= shift;
- goto remap;
- }
-
- size = event->header.size;
- if (!size)
- goto broken_event;
-