tools/perf/util/usage.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * usage.c
   4  *
   5  * Various reporting routines.
   6  * Originally copied from GIT source.
   7  *
   8  * Copyright (C) Linus Torvalds, 2005
   9  */
  10 #include "util.h"
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <linux/compiler.h>
  14
  15 const char perf_usage_string[] =
  16         "perf [--version] [--help] [OPTIONS] COMMAND [ARGS]";
  17
  18 const char perf_more_info_string[] =
  19         "See 'perf help COMMAND' for more information on a specific command.";
  20
  21 static __noreturn void usage_builtin(const char *err)
  22 {
  23         fprintf(stderr, "\n Usage: %s\n", err);
  24         exit(129);
  25 }
  26
  27 /* If we are in a dlopen()ed .so write to a global variable would segfault
  28  * (ugh), so keep things static. */
  29 static void (*usage_routine)(const char *err) __noreturn = usage_builtin;
  30
  31 void usage(const char *err)
  32 {
  33         usage_routine(err);
  34 }