static const char *find_debugfs(void) { const char *path = perf_debugfs_mount(NULL); if (!path) fprintf(stderr, "Your kernel does not support the debugfs filesystem"); return path; }
int main(int argc, const char **argv) { const char *cmd; /* The page_size is placed in util object. */ page_size = sysconf(_SC_PAGE_SIZE); cmd = perf_extract_argv0_path(argv[0]); if (!cmd) cmd = "perf-help"; /* get debugfs mount point from /proc/mounts */ perf_debugfs_mount(NULL); /* * "perf-xxxx" is the same as "perf xxxx", but we obviously: * * - cannot take flags in between the "perf" and the "xxxx". * - cannot execute it externally (since it would just do * the same thing over again) * * So we just directly call the internal command handler, and * die if that one cannot handle it. */ if (!prefixcmp(cmd, "perf-")) { cmd += 5; argv[0] = cmd; handle_internal_command(argc, argv); fprintf(stderr, "cannot handle %s internally", cmd); goto out; } #ifdef HAVE_LIBAUDIT_SUPPORT if (!prefixcmp(cmd, "trace")) { set_buildid_dir(); setup_path(); argv[0] = "trace"; return cmd_trace(argc, argv, NULL); } #endif /* Look for flags.. */ argv++; argc--; handle_options(&argv, &argc, NULL); commit_pager_choice(); set_buildid_dir(); if (argc > 0) { if (!prefixcmp(argv[0], "--")) argv[0] += 2; } else { /* The user didn't specify a command; give them help */ printf("\n usage: %s\n\n", perf_usage_string); list_common_cmds_help(); printf("\n %s\n\n", perf_more_info_string); goto out; } cmd = argv[0]; test_attr__init(); /* * We use PATH to find perf commands, but we prepend some higher * precedence paths: the "--exec-path" option, the PERF_EXEC_PATH * environment, and the $(perfexecdir) from the Makefile at build * time. */ setup_path(); /* * Block SIGWINCH notifications so that the thread that wants it can * unblock and get syscalls like select interrupted instead of waiting * forever while the signal goes to some other non interested thread. */ pthread__block_sigwinch(); while (1) { static int done_help; int was_alias = run_argv(&argc, &argv); if (errno != ENOENT) break; if (was_alias) { fprintf(stderr, "Expansion of alias '%s' failed; " "'%s' is not a perf-command\n", cmd, argv[0]); goto out; } if (!done_help) { cmd = argv[0] = help_unknown_cmd(cmd); done_help = 1; } else break; } fprintf(stderr, "Failed to run command '%s': %s\n", cmd, strerror(errno)); out: return 1; }