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test-skeleton: add usage information 

I keep trying to run tests with --help and then remembering that does
nothing when it throws an error.  That means I have to dig into the
source when I want to refer to flags or env vars and re-read a good
amount of code to find the nested locations.

Make this all much more user friendly with a usage screen that gets
printed out whenever an unknown option is specified.
This commit is contained in:
Mike Frysinger 2015-08-04 07:26:46 -04:00
parent 182d6096fe
commit 496405af79
2 changed files with 41 additions and 0 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2015-08-05 Mike Frysinger <vapier@gentoo.org>
* test-skeleton.c (usage): New function.
(main): Call usage when opt is '?'.
2015-08-05 Mike Frysinger <vapier@gentoo.org>
* sysdeps/unix/sysv/linux/mmap64.c: Move MMAP2_PAGE_SHIFT define

36
test-skeleton.c
View File

@ -250,6 +250,41 @@ set_fortify_handler (void (*handler) (int sig))
ignore_stderr ();
}
/* Show people how to run the program. */
static void
usage (void)
{
size_t i;
printf ("Usage: %s [options]\n"
"\n"
"Environment Variables:\n"
" TIMEOUTFACTOR An integer used to scale the timeout\n"
" TMPDIR Where to place temporary files\n"
"\n",
program_invocation_short_name);
printf ("Options:\n");
for (i = 0; options[i].name; ++i)
{
int indent;
indent = printf (" --%s", options[i].name);
if (options[i].has_arg == required_argument)
indent += printf (" <arg>");
printf ("%*s", 25 - indent, "");
switch (options[i].val)
{
case OPT_DIRECT:
printf ("Run the test directly (instead of forking & monitoring)");
break;
case OPT_TESTDIR:
printf ("Override the TMPDIR env var");
break;
}
printf ("\n");
}
}
/* We provide the entry point here. */
int
main (int argc, char *argv[])
@ -271,6 +306,7 @@ main (int argc, char *argv[])
switch (opt)
{
case '?':
usage ();
exit (1);
case OPT_DIRECT:
direct = 1;