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tools/lsmod: add basic opts like rmmod

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This allows for more consistent experience across tools, allows to see
the version, observe/debug if "Used by" reports -1, etc.

Also don't forget to update the man page :-)

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Link: https://github.com/kmod-project/kmod/pull/138
Signed-off-by: Lucas De Marchi <lucas.de.marchi@gmail.com>
This commit is contained in:
Emil Velikov 2024-09-18 16:49:08 +01:00 committed by Lucas De Marchi
parent b644b8d784
commit 6313d40dd5
2 changed files with 95 additions and 15 deletions
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22
man/lsmod.8.scd
View File

@ -5,13 +5,33 @@ LSMOD(8) "kmod" "lsmod"
lsmod - Show the status of modules in the Linux Kernel
# SYNOPSIS
*lsmod*
*lsmod* [_OPTIONS_]
# DESCRIPTION
*lsmod* is a trivial program which nicely formats the contents of the
/proc/modules, showing what kernel modules are currently loaded.
# OPTIONS
*-s*
*--syslog*
Send errors to syslog instead of standard error.
*-v*
*--verbose*
Print messages about what the program is doing. Usually *lsmod* prints
messages only if something goes wrong.
*-V*
*--version*
Show version of program and exit.
*-h*
*--help*
Print the help message and exit.
# COPYRIGHT
This manual page originally Copyright 2002, Rusty Russell, IBM Corporation.

88
tools/lsmod.c
View File

@ -4,6 +4,7 @@
*/
#include <errno.h>
#include <getopt.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
@ -14,30 +15,86 @@
#include "kmod.h"
static const char cmdopts_s[] = "svVh";
static const struct option cmdopts[] = {
// clang-format off
{ "syslog", no_argument, 0, 's' },
{ "verbose", no_argument, 0, 'v' },
{ "version", no_argument, 0, 'V' },
{ "help", no_argument, 0, 'h' },
{ NULL, 0, 0, 0 },
// clang-format on
};
static void help(void)
{
printf("Usage:\n"
"\t%s [options]\n"
"Options:\n"
"\t-s, --syslog print to syslog, not stderr\n"
"\t-v, --verbose enables more messages\n"
"\t-V, --version show version\n"
"\t-h, --help show this help\n",
program_invocation_short_name);
}
static int do_lsmod(int argc, char *argv[])
{
struct kmod_ctx *ctx;
struct kmod_ctx *ctx = NULL;
const char *null_config = NULL;
struct kmod_list *list, *itr;
int err;
int verbose = LOG_ERR;
int use_syslog;
int err, r = 0;
if (argc != 1) {
fprintf(stderr, "Usage: %s\n", argv[0]);
return EXIT_FAILURE;
for (;;) {
int c, idx = 0;
c = getopt_long(argc, argv, cmdopts_s, cmdopts, &idx);
if (c == -1)
break;
switch (c) {
case 's':
use_syslog = 1;
break;
case 'v':
verbose++;
break;
case 'h':
help();
return EXIT_SUCCESS;
case 'V':
kmod_version();
return EXIT_SUCCESS;
case '?':
return EXIT_FAILURE;
default:
ERR("unexpected getopt_long() value '%c'.\n", c);
return EXIT_FAILURE;
}
}
log_open(use_syslog);
if (optind < argc) {
ERR("too many arguments provided.\n");
r = EXIT_FAILURE;
goto done;
}
ctx = kmod_new(NULL, &null_config);
if (ctx == NULL) {
fputs("Error: kmod_new() failed!\n", stderr);
return EXIT_FAILURE;
if (!ctx) {
ERR("kmod_new() failed!\n");
r = EXIT_FAILURE;
goto done;
}
log_setup_kmod_log(ctx, verbose);
err = kmod_module_new_from_loaded(ctx, &list);
if (err < 0) {
fprintf(stderr, "Error: could not get list of modules: %s\n",
strerror(-err));
kmod_unref(ctx);
return EXIT_FAILURE;
ERR("could not get list of modules: %s\n", strerror(-err));
r = EXIT_FAILURE;
goto done;
}
puts("Module Size Used by");
@ -70,9 +127,12 @@ static int do_lsmod(int argc, char *argv[])
kmod_module_unref(mod);
}
kmod_module_unref_list(list);
kmod_unref(ctx);
return EXIT_SUCCESS;
done:
kmod_unref(ctx);
log_close();
return r == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
}
const struct kmod_cmd kmod_cmd_compat_lsmod = {