LXR linux/tools/tracing/rtla/src/rtla.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Copyright (C) 2021 Red Hat Inc, Daniel Bristot de Oliveira <bristot@kernel.org>
   4 */
   5
   6#include <getopt.h>
   7#include <stdlib.h>
   8#include <string.h>
   9#include <stdio.h>
  10
  11#include "osnoise.h"
  12#include "timerlat.h"
  13
  14/*
  15 * rtla_usage - print rtla usage
  16 */
  17static void rtla_usage(void)
  18{
  19        int i;
  20
  21        static const char *msg[] = {
  22                "",
  23                "rtla version " VERSION,
  24                "",
  25                "  usage: rtla COMMAND ...",
  26                "",
  27                "  commands:",
  28                "     osnoise  - gives information about the operating system noise (osnoise)",
  29                "     timerlat - measures the timer irq and thread latency",
  30                "",
  31                NULL,
  32        };
  33
  34        for (i = 0; msg[i]; i++)
  35                fprintf(stderr, "%s\n", msg[i]);
  36        exit(1);
  37}
  38
  39/*
  40 * run_command - try to run a rtla tool command
  41 *
  42 * It returns 0 if it fails. The tool's main will generally not
  43 * return as they should call exit().
  44 */
  45int run_command(int argc, char **argv, int start_position)
  46{
  47        if (strcmp(argv[start_position], "osnoise") == 0) {
  48                osnoise_main(argc-start_position, &argv[start_position]);
  49                goto ran;
  50        } else if (strcmp(argv[start_position], "timerlat") == 0) {
  51                timerlat_main(argc-start_position, &argv[start_position]);
  52                goto ran;
  53        }
  54
  55        return 0;
  56ran:
  57        return 1;
  58}
  59
  60int main(int argc, char *argv[])
  61{
  62        int retval;
  63
  64        /* is it an alias? */
  65        retval = run_command(argc, argv, 0);
  66        if (retval)
  67                exit(0);
  68
  69        if (argc < 2)
  70                goto usage;
  71
  72        if (strcmp(argv[1], "-h") == 0) {
  73                rtla_usage();
  74                exit(0);
  75        } else if (strcmp(argv[1], "--help") == 0) {
  76                rtla_usage();
  77                exit(0);
  78        }
  79
  80        retval = run_command(argc, argv, 1);
  81        if (retval)
  82                exit(0);
  83
  84usage:
  85        rtla_usage();
  86        exit(1);
  87}
  88