diff options
Diffstat (limited to 'tracecmd/trace-show.c')
| -rw-r--r-- | tracecmd/trace-show.c | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/tracecmd/trace-show.c b/tracecmd/trace-show.c new file mode 100644 index 00000000..eb328527 --- /dev/null +++ b/tracecmd/trace-show.c @@ -0,0 +1,172 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2009, 2010 Red Hat Inc, Steven Rostedt <srostedt@redhat.com> + * + */ +#include <stdlib.h> +#include <getopt.h> +#include <errno.h> + +#include "tracefs.h" +#include "trace-local.h" + +enum { + OPT_tracing_on = 255, + OPT_current_tracer = 254, + OPT_buffer_size_kb = 253, + OPT_buffer_total_size_kb = 252, + OPT_ftrace_filter = 251, + OPT_ftrace_notrace = 250, + OPT_ftrace_pid = 249, + OPT_graph_function = 248, + OPT_graph_notrace = 247, + OPT_cpumask = 246, +}; + +void trace_show(int argc, char **argv) +{ + const char *buffer = NULL; + const char *file = "trace"; + const char *cpu = NULL; + struct buffer_instance *instance = &top_instance; + char cpu_path[128]; + char *path; + int snap = 0; + int pipe = 0; + int show_name = 0; + int option_index = 0; + int stop = 0; + int c; + static struct option long_options[] = { + {"tracing_on", no_argument, NULL, OPT_tracing_on}, + {"current_tracer", no_argument, NULL, OPT_current_tracer}, + {"buffer_size", no_argument, NULL, OPT_buffer_size_kb}, + {"buffer_total_size", no_argument, NULL, OPT_buffer_total_size_kb}, + {"ftrace_filter", no_argument, NULL, OPT_ftrace_filter}, + {"ftrace_notrace", no_argument, NULL, OPT_ftrace_notrace}, + {"ftrace_pid", no_argument, NULL, OPT_ftrace_pid}, + {"graph_function", no_argument, NULL, OPT_graph_function}, + {"graph_notrace", no_argument, NULL, OPT_graph_notrace}, + {"cpumask", no_argument, NULL, OPT_cpumask}, + {"help", no_argument, NULL, '?'}, + {NULL, 0, NULL, 0} + }; + + init_top_instance(); + + while ((c = getopt_long(argc-1, argv+1, "B:c:fsp", + long_options, &option_index)) >= 0) { + switch (c) { + case 'h': + usage(argv); + break; + case 'B': + if (buffer) + die("Can only show one buffer at a time"); + buffer = optarg; + instance = allocate_instance(optarg); + if (!instance) + die("Failed to create instance"); + break; + case 'c': + if (cpu) + die("Can only show one CPU at a time"); + cpu = optarg; + break; + case 'f': + show_name = 1; + break; + case 's': + snap = 1; + if (pipe) + die("Can not have -s and -p together"); + break; + case 'p': + pipe = 1; + if (snap) + die("Can not have -s and -p together"); + break; + case OPT_tracing_on: + show_instance_file(instance, "tracing_on"); + stop = 1; + break; + case OPT_current_tracer: + show_instance_file(instance, "current_tracer"); + stop = 1; + break; + case OPT_buffer_size_kb: + show_instance_file(instance, "buffer_size_kb"); + stop = 1; + break; + case OPT_buffer_total_size_kb: + show_instance_file(instance, "buffer_total_size_kb"); + stop = 1; + break; + case OPT_ftrace_filter: + show_instance_file(instance, "set_ftrace_filter"); + stop = 1; + break; + case OPT_ftrace_notrace: + show_instance_file(instance, "set_ftrace_notrace"); + stop = 1; + break; + case OPT_ftrace_pid: + show_instance_file(instance, "set_ftrace_pid"); + stop = 1; + break; + case OPT_graph_function: + show_instance_file(instance, "set_graph_function"); + stop = 1; + break; + case OPT_graph_notrace: + show_instance_file(instance, "set_graph_notrace"); + stop = 1; + break; + case OPT_cpumask: + show_instance_file(instance, "tracing_cpumask"); + stop = 1; + break; + default: + usage(argv); + } + } + if (stop) + exit(0); + if (pipe) + file = "trace_pipe"; + else if (snap) + file = "snapshot"; + + if (cpu) { + char *endptr; + long val; + + errno = 0; + val = strtol(cpu, &endptr, 0); + if (errno || cpu == endptr) + die("Invalid CPU index '%s'", cpu); + snprintf(cpu_path, 128, "per_cpu/cpu%ld/%s", val, file); + file = cpu_path; + } + + if (buffer) { + int ret; + + ret = asprintf(&path, "instances/%s/%s", buffer, file); + if (ret < 0) + die("Failed to allocate instance path %s", file); + file = path; + } + + if (show_name) { + char *name; + name = tracefs_get_tracing_file(file); + printf("%s\n", name); + tracefs_put_tracing_file(name); + } + show_file(file); + if (buffer) + free(path); + + return; +} |