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authorDenys Vlasenko <vda.linux@googlemail.com>2009-06-17 16:46:06 (GMT)
committer Denys Vlasenko <vda.linux@googlemail.com>2009-06-17 16:46:06 (GMT)
commitee47f6e44f1a33146e26c7410ade10a98f78ead1 (patch)
tree0d86e43e6c6162dbf64f9bf01374abaffec3179b
parenta5bdbe10877e2e53aaba051eddfd5d47520657f5 (diff)
downloadbusybox-ee47f6e44f1a33146e26c7410ade10a98f78ead1.tar.gz
busybox-ee47f6e44f1a33146e26c7410ade10a98f78ead1.tar.bz2
modprobe: correct exitcode handling and error messages with respect to -q
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>
-rw-r--r--modutils/modprobe.c159
-rw-r--r--modutils/modutils.c65
-rw-r--r--modutils/modutils.h12
3 files changed, 143 insertions, 93 deletions
diff --git a/modutils/modprobe.c b/modutils/modprobe.c
index d000c91..cfc16cb 100644
--- a/modutils/modprobe.c
+++ b/modutils/modprobe.c
@@ -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);
}
diff --git a/modutils/modutils.c b/modutils/modutils.c
index f437a98..969926d 100644
--- a/modutils/modutils.c
+++ b/modutils/modutils.c
@@ -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);
}
diff --git a/modutils/modutils.h b/modutils/modutils.h
index 8cca5cc..1cf4bba 100644
--- a/modutils/modutils.h
+++ b/modutils/modutils.h
@@ -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);