perf/util/usage.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * usage.c
0004  *
0005  * Various reporting routines.
0006  * Originally copied from GIT source.
0007  *
0008  * Copyright (C) Linus Torvalds, 2005
0009  */
0010 #include "util.h"
0011 #include <stdio.h>
0012 #include <stdlib.h>
0013 #include <linux/compiler.h>
0014
0015 static __noreturn void usage_builtin(const char *err)
0016 {
0017     fprintf(stderr, "\n Usage: %s\n", err);
0018     exit(129);
0019 }
0020
0021 /* If we are in a dlopen()ed .so write to a global variable would segfault
0022  * (ugh), so keep things static. */
0023 static void (*usage_routine)(const char *err) __noreturn = usage_builtin;
0024
0025 void usage(const char *err)
0026 {
0027     usage_routine(err);
0028 }