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elf: Implement ld.so --help

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--help processing is deferred to the point where the executable has
been loaded, so that it is possible to eventually include information
from the main executable in the help output.

As suggested in the GNU command-line interface guidelines, the help
message is printed to standard output, and the exit status is
successful.

Handle usage errors closer to the GNU command-line interface
guidelines.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Florian Weimer
2020-10-08 10:57:10 +02:00
parent 27316f4a23
commit e0f1a58f3d
3 changed files with 75 additions and 13 deletions
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24
elf/dl-usage.c
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@ -19,12 +19,24 @@
#include <dl-cache.h>
#include <dl-main.h>
#include <ldsodefs.h>
#include <unistd.h>
void
_dl_usage (void)
_dl_usage (const char *argv0, const char *wrong_option)
{
_dl_fatal_printf ("\
Usage: ld.so [OPTION]... EXECUTABLE-FILE [ARGS-FOR-PROGRAM...]\n\
if (wrong_option != NULL)
_dl_error_printf ("%s: unrecognized option '%s'\n", argv0, wrong_option);
else
_dl_error_printf ("%s: missing program name\n", argv0);
_dl_error_printf ("Try '%s --help' for more information.\n", argv0);
_exit (EXIT_FAILURE);
}
void
_dl_help (const char *argv0, struct dl_main_state *state)
{
_dl_printf ("\
Usage: %s [OPTION]... EXECUTABLE-FILE [ARGS-FOR-PROGRAM...]\n\
You have invoked `ld.so', the helper program for shared library executables.\n\
This program usually lives in the file `/lib/ld.so', and special directives\n\
in executable files using ELF shared libraries tell the system's program\n\
@ -47,5 +59,9 @@ of this helper program; chances are you did not intend to run this program.\n\
in LIST\n\
--audit LIST use objects named in LIST as auditors\n\
--preload LIST preload objects named in LIST\n\
--argv0 STRING set argv[0] to STRING before running\n");
--argv0 STRING set argv[0] to STRING before running\n\
--help display this help and exit\n\
",
argv0);
_exit (EXIT_SUCCESS);
}