tools/tracing/rtla/src/timerlat.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 #include <sys/types.h>
   6 #include <sys/stat.h>
   7 #include <pthread.h>
   8 #include <stdlib.h>
   9 #include <string.h>
  10 #include <unistd.h>
  11 #include <errno.h>
  12 #include <fcntl.h>
  13 #include <stdio.h>
  14
  15 #include "timerlat.h"
  16
  17 static void timerlat_usage(int err)
  18 {
  19         int i;
  20
  21         static const char * const msg[] = {
  22                 "",
  23                 "timerlat version " VERSION,
  24                 "",
  25                 "  usage: [rtla] timerlat [MODE] ...",
  26                 "",
  27                 "  modes:",
  28                 "     top   - prints the summary from timerlat tracer",
  29                 "     hist  - prints a histogram of timer latencies",
  30                 "",
  31                 "if no MODE is given, the top mode is called, passing the arguments",
  32                 NULL,
  33         };
  34
  35         for (i = 0; msg[i]; i++)
  36                 fprintf(stderr, "%s\n", msg[i]);
  37         exit(err);
  38 }
  39
  40 int timerlat_main(int argc, char *argv[])
  41 {
  42         if (argc == 0)
  43                 goto usage;
  44
  45         /*
  46          * if timerlat was called without any argument, run the
  47          * default cmdline.
  48          */
  49         if (argc == 1) {
  50                 timerlat_top_main(argc, argv);
  51                 exit(0);
  52         }
  53
  54         if ((strcmp(argv[1], "-h") == 0) || (strcmp(argv[1], "--help") == 0)) {
  55                 timerlat_usage(0);
  56         } else if (strncmp(argv[1], "-", 1) == 0) {
  57                 /* the user skipped the tool, call the default one */
  58                 timerlat_top_main(argc, argv);
  59                 exit(0);
  60         } else if (strcmp(argv[1], "top") == 0) {
  61                 timerlat_top_main(argc-1, &argv[1]);
  62                 exit(0);
  63         } else if (strcmp(argv[1], "hist") == 0) {
  64                 timerlat_hist_main(argc-1, &argv[1]);
  65                 exit(0);
  66         }
  67
  68 usage:
  69         timerlat_usage(1);
  70         exit(1);
  71 }