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modprobe: correct exitcode handling and error messages with respect to -q

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function                                             old     new   delta
do_modprobe                                          319     339     +20
bb_delete_module                                      10      26     +16
moderror                                              62      71      +9
bb_init_module                                       112     119      +7
modprobe_main                                        488     494      +6
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 5/0 up/down: 58/0)               Total: 58 bytes

Signed-off-by: Gilles Espinasse <g.esp@free.fr>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2009-06-17 18:46:06 +02:00
parent a5bdbe1087
commit ee47f6e44f
3 changed files with 143 additions and 93 deletions
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159
modutils/modprobe.c
View File

@ -9,10 +9,9 @@
*/
/* Note that unlike older versions of modules.dep/depmod (busybox and m-i-t),
* we expect the full dependency list to be specified in modules.dep. Older
* versions would only export the direct dependency list.
* we expect the full dependency list to be specified in modules.dep.
* Older versions would only export the direct dependency list.
*/
#include "libbb.h"
#include "modutils.h"
#include <sys/utsname.h>
@ -21,11 +20,11 @@
//#define DBG(fmt, ...) bb_error_msg("%s: " fmt, __func__, ## __VA_ARGS__)
#define DBG(...) ((void)0)
#define MODULE_FLAG_LOADED 0x0001
#define MODULE_FLAG_NEED_DEPS 0x0002
#define MODULE_FLAG_LOADED 0x0001
#define MODULE_FLAG_NEED_DEPS 0x0002
/* "was seen in modules.dep": */
#define MODULE_FLAG_FOUND_IN_MODDEP 0x0004
#define MODULE_FLAG_BLACKLISTED 0x0008
#define MODULE_FLAG_FOUND_IN_MODDEP 0x0004
#define MODULE_FLAG_BLACKLISTED 0x0008
struct module_entry { /* I'll call it ME. */
unsigned flags;
@ -38,18 +37,30 @@ struct module_entry { /* I'll call it ME. */
llist_t *deps; /* strings. modules we depend on */
};
/* NB: INSMOD_OPT_SILENT bit suppresses ONLY non-existent modules,
* not deleted ones (those are still listed in modules.dep).
* module-init-tools version 3.4:
* # modprobe bogus
* FATAL: Module bogus not found. [exitcode 1]
* # modprobe -q bogus [silent, exitcode still 1]
* but:
* # rm kernel/drivers/net/dummy.ko
* # modprobe -q dummy
* FATAL: Could not open '/lib/modules/xxx/kernel/drivers/net/dummy.ko': No such file or directory
* [exitcode 1]
*/
#define MODPROBE_OPTS "acdlnrt:VC:" IF_FEATURE_MODPROBE_BLACKLIST("b")
enum {
MODPROBE_OPT_INSERT_ALL = (INSMOD_OPT_UNUSED << 0), /* a */
MODPROBE_OPT_DUMP_ONLY = (INSMOD_OPT_UNUSED << 1), /* c */
MODPROBE_OPT_D = (INSMOD_OPT_UNUSED << 2), /* d */
MODPROBE_OPT_LIST_ONLY = (INSMOD_OPT_UNUSED << 3), /* l */
MODPROBE_OPT_SHOW_ONLY = (INSMOD_OPT_UNUSED << 4), /* n */
MODPROBE_OPT_REMOVE = (INSMOD_OPT_UNUSED << 5), /* r */
MODPROBE_OPT_RESTRICT = (INSMOD_OPT_UNUSED << 6), /* t */
MODPROBE_OPT_VERONLY = (INSMOD_OPT_UNUSED << 7), /* V */
MODPROBE_OPT_CONFIGFILE = (INSMOD_OPT_UNUSED << 8), /* C */
MODPROBE_OPT_BLACKLIST = (INSMOD_OPT_UNUSED << 9) * ENABLE_FEATURE_MODPROBE_BLACKLIST,
MODPROBE_OPT_INSERT_ALL = (INSMOD_OPT_UNUSED << 0), /* a */
MODPROBE_OPT_DUMP_ONLY = (INSMOD_OPT_UNUSED << 1), /* c */
MODPROBE_OPT_D = (INSMOD_OPT_UNUSED << 2), /* d */
MODPROBE_OPT_LIST_ONLY = (INSMOD_OPT_UNUSED << 3), /* l */
MODPROBE_OPT_SHOW_ONLY = (INSMOD_OPT_UNUSED << 4), /* n */
MODPROBE_OPT_REMOVE = (INSMOD_OPT_UNUSED << 5), /* r */
MODPROBE_OPT_RESTRICT = (INSMOD_OPT_UNUSED << 6), /* t */
MODPROBE_OPT_VERONLY = (INSMOD_OPT_UNUSED << 7), /* V */
MODPROBE_OPT_CONFIGFILE = (INSMOD_OPT_UNUSED << 8), /* C */
MODPROBE_OPT_BLACKLIST = (INSMOD_OPT_UNUSED << 9) * ENABLE_FEATURE_MODPROBE_BLACKLIST,
};
struct globals {
@ -140,7 +151,7 @@ static int FAST_FUNC config_file_action(const char *filename,
{
char *tokens[3];
parser_t *p;
struct module_entry *m;
struct module_entry *m;
int rc = TRUE;
if (bb_basename(filename)[0] == '.')
@ -199,7 +210,7 @@ static int FAST_FUNC config_file_action(const char *filename,
}
}
config_close(p);
error:
error:
return rc;
}
@ -209,6 +220,11 @@ static int read_config(const char *path)
config_file_action, NULL, NULL, 1);
}
/* Return: similar to bb_init_module:
* 0 on success,
* -errno on open/read error,
* errno on init_module() error
*/
static int do_modprobe(struct module_entry *m)
{
struct module_entry *m2 = m2; /* for compiler */
@ -217,7 +233,8 @@ static int do_modprobe(struct module_entry *m)
llist_t *l;
if (!(m->flags & MODULE_FLAG_FOUND_IN_MODDEP)) {
DBG("skipping %s, not found in modules.dep", m->modname);
if (!(option_mask32 & INSMOD_OPT_SILENT))
bb_error_msg("module %s not found in modules.dep", m->probed_name);
return -ENOENT;
}
DBG("do_modprob'ing %s", m->modname);
@ -230,43 +247,52 @@ static int do_modprobe(struct module_entry *m)
first = 1;
rc = 0;
while (m->deps && rc == 0) {
fn = llist_pop(&m->deps);
while (m->deps) {
rc = 0;
fn = llist_pop(&m->deps); /* we leak it */
m2 = get_or_add_modentry(fn);
if (option_mask32 & MODPROBE_OPT_REMOVE) {
/* modprobe -r */
if (m2->flags & MODULE_FLAG_LOADED) {
if (bb_delete_module(m2->modname, O_EXCL) != 0) {
if (first)
rc = errno;
rc = bb_delete_module(m2->modname, O_EXCL);
if (rc) {
if (first) {
bb_error_msg("failed to unload module %s: %s",
m2->probed_name ? m2->probed_name : m2->modname,
moderror(rc));
break;
}
} else {
m2->flags &= ~MODULE_FLAG_LOADED;
}
}
/* do not error out if *deps* fail to unload */
first = 0;
} else if (!(m2->flags & MODULE_FLAG_LOADED)) {
options = m2->options;
m2->options = NULL;
if (m == m2)
options = gather_options_str(options, G.cmdline_mopts);
rc = bb_init_module(fn, options);
DBG("loaded %s '%s', rc:%d", fn, options, rc);
if (rc == 0)
m2->flags |= MODULE_FLAG_LOADED;
free(options);
} else {
DBG("%s is already loaded, skipping", fn);
continue;
}
free(fn);
}
if (m2->flags & MODULE_FLAG_LOADED) {
DBG("%s is already loaded, skipping", fn);
continue;
}
if (rc && !(option_mask32 & INSMOD_OPT_SILENT)) {
bb_error_msg("failed to %sload module %s: %s",
(option_mask32 & MODPROBE_OPT_REMOVE) ? "un" : "",
options = m2->options;
m2->options = NULL;
if (m == m2)
options = gather_options_str(options, G.cmdline_mopts);
rc = bb_init_module(fn, options);
DBG("loaded %s '%s', rc:%d", fn, options, rc);
free(options);
if (rc) {
bb_error_msg("failed to load module %s (%s): %s",
m2->probed_name ? m2->probed_name : m2->modname,
moderror(rc)
);
fn,
moderror(rc)
);
break;
}
m2->flags |= MODULE_FLAG_LOADED;
}
return rc;
@ -278,7 +304,7 @@ static void load_modules_dep(void)
char *colon, *tokens[2];
parser_t *p;
/* Modprobe does not work at all without modprobe.dep,
/* Modprobe does not work at all without modules.dep,
* even if the full module name is given. Returning error here
* was making us later confuse user with this message:
* "module /full/path/to/existing/file/module.ko not found".
@ -387,35 +413,40 @@ int modprobe_main(int argc UNUSED_PARAM, char **argv)
load_modules_dep();
}
rc = 0;
while ((me = llist_pop(&G.probes)) != NULL) {
if (me->realnames == NULL) {
DBG("probing by module name");
/* This is not an alias. Literal names are blacklisted
* only if '-b' is given.
*/
if (!(opt & MODPROBE_OPT_BLACKLIST)
|| !(me->flags & MODULE_FLAG_BLACKLISTED)
) {
rc = do_modprobe(me);
//FIXME: what if rc > 0?
if (rc < 0 && !(opt & INSMOD_OPT_SILENT))
bb_error_msg("module %s not found",
me->probed_name);
rc |= do_modprobe(me);
}
} else {
/* Probe all realnames */
do {
char *realname = llist_pop(&me->realnames);
struct module_entry *m2;
DBG("probing %s by realname %s", me->modname, realname);
m2 = get_or_add_modentry(realname);
if (!(m2->flags & MODULE_FLAG_BLACKLISTED))
do_modprobe(m2);
//FIXME: error check?
free(realname);
} while (me->realnames != NULL);
continue;
}
/* Probe all real names for the alias */
do {
char *realname = llist_pop(&me->realnames);
struct module_entry *m2;
DBG("probing alias %s by realname %s", me->modname, realname);
m2 = get_or_add_modentry(realname);
if (!(m2->flags & MODULE_FLAG_BLACKLISTED)
&& (!(m2->flags & MODULE_FLAG_LOADED)
|| (opt & MODPROBE_OPT_REMOVE))
) {
//TODO: we can pass "me" as 2nd param to do_modprobe,
//and make do_modprobe emit more meaningful error messages
//with alias name included, not just module name alias resolves to.
rc |= do_modprobe(m2);
}
free(realname);
} while (me->realnames != NULL);
}
return EXIT_SUCCESS;
return (rc != 0);
}

65
modutils/modutils.c
View File

@ -25,7 +25,7 @@ void FAST_FUNC replace(char *s, char what, char with)
}
}
char * FAST_FUNC replace_underscores(char *s)
char* FAST_FUNC replace_underscores(char *s)
{
replace(s, '-', '_');
return s;
@ -45,7 +45,7 @@ int FAST_FUNC string_to_llist(char *string, llist_t **llist, const char *delim)
return len;
}
char * FAST_FUNC filename2modname(const char *filename, char *modname)
char* FAST_FUNC filename2modname(const char *filename, char *modname)
{
int i;
char *from;
@ -62,24 +62,6 @@ char * FAST_FUNC filename2modname(const char *filename, char *modname)
return modname;
}
const char * FAST_FUNC moderror(int err)
{
switch (err) {
case -1:
return "no such module";
case ENOEXEC:
return "invalid module format";
case ENOENT:
return "unknown symbol in module, or unknown parameter";
case ESRCH:
return "module has wrong symbol version";
case ENOSYS:
return "kernel does not support requested operation";
default:
return strerror(err);
}
}
char * FAST_FUNC parse_cmdline_module_options(char **argv)
{
char *options;
@ -95,6 +77,11 @@ char * FAST_FUNC parse_cmdline_module_options(char **argv)
return options;
}
/* Return:
* 0 on success,
* -errno on open/read error,
* errno on init_module() error
*/
int FAST_FUNC bb_init_module(const char *filename, const char *options)
{
size_t len;
@ -104,6 +91,7 @@ int FAST_FUNC bb_init_module(const char *filename, const char *options)
if (!options)
options = "";
//TODO: audit bb_init_module_24 to match error code convention
#if ENABLE_FEATURE_2_4_MODULES
if (get_linux_version_code() < KERNEL_VERSION(2,6,0))
return bb_init_module_24(filename, options);
@ -111,19 +99,40 @@ int FAST_FUNC bb_init_module(const char *filename, const char *options)
/* Use the 2.6 way */
len = INT_MAX - 4095;
rc = ENOENT;
errno = ENOMEM; /* may be changed by e.g. open errors below */
image = xmalloc_open_zipped_read_close(filename, &len);
if (image) {
rc = 0;
if (init_module(image, len, options) != 0)
rc = errno;
free(image);
}
if (!image)
return -errno;
errno = 0;
init_module(image, len, options);
rc = errno;
free(image);
return rc;
}
int FAST_FUNC bb_delete_module(const char *module, unsigned int flags)
{
return delete_module(module, flags);
errno = 0;
delete_module(module, flags);
return errno;
}
const char* FAST_FUNC moderror(int err)
{
switch (err) {
case -1: /* btw: it's -EPERM */
return "no such module";
case ENOEXEC:
return "invalid module format";
case ENOENT:
return "unknown symbol in module, or unknown parameter";
case ESRCH:
return "module has wrong symbol version";
case ENOSYS:
return "kernel does not support requested operation";
}
if (err < 0) /* should always be */
err = -err;
return strerror(err);
}

12
modutils/modutils.h
View File

@ -17,7 +17,6 @@ PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
* internally for the maximum alias name length, which can be quite long */
#define MODULE_NAME_LEN 256
const char *moderror(int err) FAST_FUNC;
void replace(char *s, char what, char with) FAST_FUNC;
char *replace_underscores(char *s) FAST_FUNC;
int string_to_llist(char *string, llist_t **llist, const char *delim) FAST_FUNC;
@ -52,8 +51,19 @@ enum {
#endif
};
/* Return:
* 0 on success,
* -errno on open/read error,
* errno on init_module() error
*/
int FAST_FUNC bb_init_module(const char *module, const char *options);
/* Return:
* 0 on success,
* errno on init_module() error
*/
int FAST_FUNC bb_delete_module(const char *module, unsigned int flags);
/* Translates error return to a string */
const char *moderror(int err) FAST_FUNC;
#if ENABLE_FEATURE_2_4_MODULES
int FAST_FUNC bb_init_module_24(const char *module, const char *options);