24809677062

Committed 22 Apr 2026 10:05PM UTC coverage: 71.989% (-0.2%) from 72.23%

Build # 24809677062

Build Type

push

github

Committed by

bluca

Commit Message

ukify: fix default path for hwids

The documentation and commit that added this seem to suggest this should
be under /usr/lib/systemd

fixes 117ec9db7

Coverage Stats

321862 of 447097 relevant lines covered (71.99%)

1201427.36 hits per line

Source File
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85.89

/src/modules-load/modules-load.c

/* SPDX-License-Identifier: LGPL-2.1-or-later */

#include <limits.h>
#include <pthread.h>
#include <signal.h>
#include <sys/socket.h>
#include <unistd.h>

#include "alloc-util.h"
#include "assert.h"
#include "build.h"
#include "conf-files.h"
#include "constants.h"
#include "errno-util.h"
#include "fd-util.h"
#include "fileio.h"
#include "format-table.h"
#include "log.h"
#include "macro.h"
#include "main-func.h"
#include "module-util.h"
#include "options.h"
#include "ordered-set.h"
#include "parse-util.h"
#include "pretty-print.h"
#include "proc-cmdline.h"
#include "string-util.h"
#include "strv.h"

#define MODULE_NAME_MAX_LEN (4096UL)

static char **arg_proc_cmdline_modules = NULL;
static const char conf_file_dirs[] = CONF_PATHS_NULSTR("modules-load.d");

STATIC_DESTRUCTOR_REGISTER(arg_proc_cmdline_modules, strv_freep);

static int modules_list_append_suffix(OrderedSet **module_set, char *modp) {
        /* take possession of string no matter what */
        _cleanup_free_ char *mod = modp;
        int r;

        assert(module_set);
        assert(mod);

        if (strlen(mod) > MODULE_NAME_MAX_LEN)
                return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Module name max length exceeded (%lu): %s",
                                       MODULE_NAME_MAX_LEN, mod);

        /* kmod will do it anyway later, so replace now dashes with
           underscores to detect duplications due to different spelling. */
        string_replace_char(mod, '-', '_');

        r = ordered_set_ensure_put(module_set, &string_hash_ops_free, mod);
        if (r == -EEXIST)
                return 0;
        if (r < 0)
                return log_error_errno(r, "Failed to enqueue module '%s': %m", mod);

        TAKE_PTR(mod);

        return 0;
}

static int modules_list_append_dup(OrderedSet **module_set, const char *module) {
        _cleanup_free_ char *m = NULL;

        assert(module);

        if (strdup_to(&m, module) < 0)
                return log_oom();

        return modules_list_append_suffix(module_set, TAKE_PTR(m));
}

static int parse_proc_cmdline_item(const char *key, const char *value, void *data) {
        int r;

        if (proc_cmdline_key_streq(key, "modules_load")) {

                if (proc_cmdline_value_missing(key, value))
                        return 0;

                r = strv_split_and_extend(&arg_proc_cmdline_modules, value, ",", /* filter_duplicates= */ true);
                if (r < 0)
                        return log_error_errno(r, "Failed to parse modules_load= kernel command line option: %m");
        }

        return 0;
}

static int apply_file(FILE *f, const char *filename, OrderedSet **module_set) {
        int ret = 0, r;

        assert(f);

        log_debug("apply: %s", filename);
        for (;;) {
                _cleanup_free_ char *line = NULL;

                r = read_stripped_line(f, LONG_LINE_MAX, &line);
                if (r < 0)
                        return log_error_errno(r, "Failed to read file '%s': %m", filename);
                if (r == 0)
                        break;

                if (isempty(line))
                        continue;
                if (strchr(COMMENTS, *line))
                        continue;

                RET_GATHER(ret, modules_list_append_suffix(module_set, TAKE_PTR(line)));
        }

        return ret;
}

static int apply_file_from_path(const char *path, OrderedSet **module_set) {
        _cleanup_fclose_ FILE *f = NULL;
        _cleanup_free_ char *pp = NULL;
        int r;

        assert(path);

        r = search_and_fopen_nulstr(path, "re", NULL, conf_file_dirs, &f, &pp);
        if (r < 0)
                return log_error_errno(r, "Failed to open %s: %m", path);

        return apply_file(f, pp, module_set);
}

static int apply_conf_file(ConfFile *c, OrderedSet **module_set) {
        _cleanup_fclose_ FILE *f = NULL;

        f = fopen(FORMAT_PROC_FD_PATH(c->fd), "re");
        if (!f) {
                if (errno == ENOENT)
                        return 0;

                return log_error_errno(errno, "Failed to open %s: %m", c->original_path);
        }

        return apply_file(f, c->original_path, module_set);
}

static int do_direct_probe(OrderedSet *module_set) {
        _cleanup_(kmod_unrefp) struct kmod_ctx *ctx = NULL;
        char *module;
        int ret = 0, r;

        r = module_setup_context(&ctx);
        if (r < 0)
                return log_error_errno(r, "Failed to initialize libkmod context: %m");

        ORDERED_SET_FOREACH(module, module_set) {
                r = module_load_and_warn(ctx, module, /* verbose= */ true);
                if (r != -ENOENT)
                        RET_GATHER(ret, r);
        }

        return ret;
}

static int enqueue_module_to_load(int sock, const char *module) {
        ssize_t bytes;

        assert(sock >= 0);
        assert(module);

        bytes = send(sock, module, strlen(module), /* flags= */ 0);
        if (bytes < 0)
                return log_error_errno(errno, "Failed to send '%s' to thread pool: %m", module);

        return 0;
}

static int dequeue_module_to_load(int sock, char *buffer, size_t buffer_len) {
        ssize_t bytes;

        assert(sock >= 0);
        assert(buffer);

        /* Dequeue one module to be loaded from the socket pair. In case no more
         * modules are present, recv() will return 0. */
        bytes = recv(sock, buffer, buffer_len, /* flags= */ 0);
        if (bytes == 0)
                return 0;
        if (bytes < 0)
                return negative_errno();
        if ((size_t)bytes == buffer_len)
                return -E2BIG;

        buffer[bytes] = '\0';

        return 1;
}

static int run_prober(int sock) {
        _cleanup_(kmod_unrefp) struct kmod_ctx *ctx = NULL;
        char buffer[MODULE_NAME_MAX_LEN + 1];
        int ret = 0, r;

        r = module_setup_context(&ctx);
        if (r < 0)
                return log_error_errno(r, "Failed to initialize libkmod context: %m");

        for (;;) {
                r = dequeue_module_to_load(sock, buffer, sizeof(buffer));
                if (ERRNO_IS_NEG_TRANSIENT(r))
                        continue;
                if (r == -E2BIG) {
                        log_warning_errno(SYNTHETIC_ERRNO(E2BIG), "Dequeued module name too long, proceeding anyway");
                        continue;
                }
                if (r < 0)
                        return log_error_errno(r, "Failed to receive from module queue: %m");
                if (r == 0) {
                        log_debug("No more queued modules, terminate thread");
                        break;
                }

                r = module_load_and_warn(ctx, buffer, /* verbose= */ true);
                if (r != -ENOENT)
                        RET_GATHER(ret, r);
        }

        return ret;
}

static void *prober_thread(void *arg) {
        int sock = PTR_TO_FD(arg);
        return INT_TO_PTR(run_prober(sock));
}

static int create_worker_threads(size_t n_threads, void *arg, pthread_t **ret_threads, size_t *ret_n_threads) {
        _cleanup_free_ pthread_t *new_threads = NULL;
        size_t created_threads;
        sigset_t ss, saved_ss;
        int r;

        assert(ret_threads);
        assert(ret_n_threads);

        if (n_threads == 0) {
                *ret_threads = NULL;
                *ret_n_threads = 0;
                return 0;
        }

        /* Create worker threads with masked signals */
        new_threads = new(pthread_t, n_threads);
        if (!new_threads)
                return log_oom();

        /* No signals in worker threads. */
        assert_se(sigfillset(&ss) >= 0);
        r = pthread_sigmask(SIG_BLOCK, &ss, &saved_ss);
        if (r != 0)
                return log_error_errno(r, "Failed to mask signals for workers: %m");

        for (created_threads = 0; created_threads < n_threads; ++created_threads) {
                r = pthread_create(&new_threads[created_threads], /* attr= */ NULL, prober_thread, arg);
                if (r != 0) {
                        log_error_errno(r, "Failed to create worker thread %zu: %m", created_threads);
                        break;
                }
        }

        /* Restore the signal mask */
        r = pthread_sigmask(SIG_SETMASK, &saved_ss, NULL);
        if (r != 0)
                log_warning_errno(r, "Failed to restore signal mask, ignoring: %m");

        *ret_threads = TAKE_PTR(new_threads);
        *ret_n_threads = created_threads;

        return 0;
}

static int destroy_worker_threads(pthread_t **threads, size_t n_threads) {
        int ret = 0, r;

        assert(threads);
        assert(n_threads == 0 || *threads);

        for (size_t i = 0; i < n_threads; ++i) {
                void *p;
                r = pthread_join((*threads)[i], &p);
                if (r != 0)
                        RET_GATHER(ret, log_warning_errno(r, "Failed to join worker thread, proceeding anyway: %m"));
                else
                        RET_GATHER(ret, PTR_TO_INT(p));
        }

        *threads = mfree(*threads);

        return ret;
}

/* Determine number of workers, either from env or from online CPUs */
static unsigned determine_num_worker_threads(unsigned n_modules) {
        unsigned n_threads = UINT_MAX;
        int r;

        if (n_modules == 0)
                return 0;

        const char *e = secure_getenv("SYSTEMD_MODULES_LOAD_NUM_THREADS");
        if (e) {
                r = safe_atou(e, &n_threads);
                if (r < 0)
                        log_debug("Invalid value in $SYSTEMD_MODULES_LOAD_NUM_THREADS, ignoring: %s", e);
        }

        if (n_threads == UINT_MAX) {
                /* By default, use a number of worker threads equal the number of online CPUs,
                 * but clamp it to avoid a probing storm on machines with many CPUs. */
                long ncpus = sysconf(_SC_NPROCESSORS_ONLN);
                if (ncpus < 0) {
                        log_warning_errno(errno, "Failed to get number of online CPUs, ignoring: %m");
                        ncpus = 1;
                }

                n_threads = CLAMP((unsigned)ncpus, 1U, 16U);
        }

        /* There's no reason to spawn more threads than the modules that need to be loaded */
        n_threads = CLAMP(n_threads, 1U, n_modules);

        /* One of the probe threads is the main process */
        return n_threads - 1U;
}

static int help(void) {
        _cleanup_free_ char *link = NULL;
        _cleanup_(table_unrefp) Table *options = NULL;
        int r;

        if (terminal_urlify_man("systemd-modules-load.service", "8", &link) < 0)
                return log_oom();

        r = option_parser_get_help_table(&options);
        if (r < 0)
                return r;

        printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
               "Loads statically configured kernel modules.\n\n",
               program_invocation_short_name);

        r = table_print_or_warn(options);
        if (r < 0)
                return r;

        printf("\nSee the %s for details.\n", link);
        return 0;
}

static int parse_argv(int argc, char *argv[], char ***ret_args) {
        assert(argc >= 0);
        assert(argv);
        assert(ret_args);

        OptionParser state = { argc, argv };

        FOREACH_OPTION(&state, c, /* arg= */ NULL, /* on_error= */ return c)
                switch (c) {

                OPTION_COMMON_HELP:
                        return help();

                OPTION_COMMON_VERSION:
                        return version();
                }

        *ret_args = option_parser_get_args(&state);
        return 1;
}

static int run(int argc, char *argv[]) {
        /* A OrderedSet instead of a plain Set is used here to make debug easier:
         * in case a race condition is observed during module probing, the threading
         * can be disabled through the SYSTEMD_MODULES_LOAD_NUM_THREADS environment
         * variable and the modules reordered at will by the user that is debugging it.
         * In that case, the probing order would be the same in which the modules
         * appear inside the modules-load.d files (this wouldn't be true with a Set). */
        _cleanup_ordered_set_free_ OrderedSet *module_set = NULL;
        _cleanup_close_pair_ int pair[2] = EBADF_PAIR;
        _cleanup_free_ pthread_t *threads = NULL;
        size_t n_threads = 0;
        char *module;
        int ret = 0, r;

        char **args = NULL;
        r = parse_argv(argc, argv, &args);
        if (r <= 0)
                return r;

        log_setup();

        umask(0022);

        r = proc_cmdline_parse(parse_proc_cmdline_item, /* userdata= */ NULL, PROC_CMDLINE_STRIP_RD_PREFIX);
        if (r < 0)
                log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m");

        if (!strv_isempty(args)) {
                STRV_FOREACH(i, args) {
                        r = apply_file_from_path(*i, &module_set);
                        if (r < 0)
                                RET_GATHER(ret, r);
                }
        } else {
                ConfFile **files = NULL;
                size_t n_files = 0;

                CLEANUP_ARRAY(files, n_files, conf_file_free_array);

                STRV_FOREACH(i, arg_proc_cmdline_modules)
                        RET_GATHER(ret, modules_list_append_dup(&module_set, *i));

                r = conf_files_list_nulstr_full(".conf", /* root= */ NULL,
                                                CONF_FILES_REGULAR | CONF_FILES_FILTER_MASKED | CONF_FILES_WARN,
                                                conf_file_dirs, &files, &n_files);
                if (r < 0)
                        RET_GATHER(ret, log_error_errno(r, "Failed to enumerate modules-load.d files: %m"));
                else
                        FOREACH_ARRAY(cf, files, n_files)
                                RET_GATHER(ret, apply_conf_file(*cf, &module_set));
        }

        n_threads = determine_num_worker_threads((size_t) ordered_set_size(module_set));

        /* If no additional thread is required, there is no need to create the
         * thread pool or the mean to communicate with its members. */
        if (n_threads == 0) {
                log_debug("Single-threaded probe");
                return RET_GATHER(ret, do_direct_probe(module_set));
        }

        /* Create a socketpair for communication with probe workers */
        r = RET_NERRNO(socketpair(AF_UNIX, SOCK_SEQPACKET | SOCK_CLOEXEC, /* protocol= */ 0, pair));
        if (r < 0)
                return log_error_errno(r, "Failed to create socket pair: %m");

        /* Create threads, which will then wait for modules to probe. */
        log_info("Using %zu probe threads", n_threads + 1);
        r = create_worker_threads(n_threads, FD_TO_PTR(pair[1]), &threads, &n_threads);
        if (r < 0)
                log_warning_errno(r, "Failed to create probe threads, continuing as single-threaded probe");

        /* Send modules to be probed */
        ORDERED_SET_FOREACH(module, module_set)
                RET_GATHER(ret, enqueue_module_to_load(pair[0], module));

        /* Close one end of the socketpair; workers will run until the queue is empty */
        pair[0] = safe_close(pair[0]);

        /* Run the prober function also in original thread */
        RET_GATHER(ret, run_prober(pair[1]));

        /* Wait for all threads (if any) to finish and gather errors */
        RET_GATHER(ret, destroy_worker_threads(&threads, n_threads));

        return ret;
}

DEFINE_MAIN_FUNCTION(run);

1	/* SPDX-License-Identifier: LGPL-2.1-or-later */
2
3	#include <limits.h>
4	#include <pthread.h>
5	#include <signal.h>
6	#include <sys/socket.h>
7	#include <unistd.h>
8
9	#include "alloc-util.h"
10	#include "assert.h"
11	#include "build.h"
12	#include "conf-files.h"
13	#include "constants.h"
14	#include "errno-util.h"
15	#include "fd-util.h"
16	#include "fileio.h"
17	#include "format-table.h"
18	#include "log.h"
19	#include "macro.h"
20	#include "main-func.h"
21	#include "module-util.h"
22	#include "options.h"
23	#include "ordered-set.h"
24	#include "parse-util.h"
25	#include "pretty-print.h"
26	#include "proc-cmdline.h"
27	#include "string-util.h"
28	#include "strv.h"
29
30	#define MODULE_NAME_MAX_LEN (4096UL)
31
32	static char **arg_proc_cmdline_modules = NULL;
33	static const char conf_file_dirs[] = CONF_PATHS_NULSTR("modules-load.d");
34
35	STATIC_DESTRUCTOR_REGISTER(arg_proc_cmdline_modules, strv_freep);	73✔
36
37	static int modules_list_append_suffix(OrderedSet *module_set, char modp) {	88✔
38	/* take possession of string no matter what */
39	_cleanup_free_ char *mod = modp;	88✔
40	int r;	88✔
41
42	assert(module_set);	88✔
43	assert(mod);	88✔
44
45	if (strlen(mod) > MODULE_NAME_MAX_LEN)	88✔
46	return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Module name max length exceeded (%lu): %s",	×
47	MODULE_NAME_MAX_LEN, mod);
48
49	/* kmod will do it anyway later, so replace now dashes with
50	underscores to detect duplications due to different spelling. */
51	string_replace_char(mod, '-', '_');	88✔
52
53	r = ordered_set_ensure_put(module_set, &string_hash_ops_free, mod);	88✔
54	if (r == -EEXIST)	88✔
55	return 0;
56	if (r < 0)	80✔
57	return log_error_errno(r, "Failed to enqueue module '%s': %m", mod);	×
58
59	TAKE_PTR(mod);
60
61	return 0;
62	}
63
64	static int modules_list_append_dup(OrderedSet *module_set, const char module) {	2✔
65	_cleanup_free_ char *m = NULL;	2✔
66
67	assert(module);	2✔
68
69	if (strdup_to(&m, module) < 0)	2✔
70	return log_oom();	×
71
72	return modules_list_append_suffix(module_set, TAKE_PTR(m));	2✔
73	}
74
75	static int parse_proc_cmdline_item(const char key, const char value, void *data) {	3,051✔
76	int r;	3,051✔
77
78	if (proc_cmdline_key_streq(key, "modules_load")) {	3,051✔
79
80	if (proc_cmdline_value_missing(key, value))	4✔
81	return 0;
82
83	r = strv_split_and_extend(&arg_proc_cmdline_modules, value, ",", /* filter_duplicates= */ true);	4✔
84	if (r < 0)	4✔
85	return log_error_errno(r, "Failed to parse modules_load= kernel command line option: %m");	×
86	}
87
88	return 0;
89	}
90
91	static int apply_file(FILE f, const char filename, OrderedSet **module_set) {	71✔
92	int ret = 0, r;	71✔
93
94	assert(f);	71✔
95
96	log_debug("apply: %s", filename);	71✔
97	for (;;) {	772✔
98	_cleanup_free_ char *line = NULL;	701✔
99
100	r = read_stripped_line(f, LONG_LINE_MAX, &line);	772✔
101	if (r < 0)	772✔
102	return log_error_errno(r, "Failed to read file '%s': %m", filename);	×
103	if (r == 0)	772✔
104	break;
105
106	if (isempty(line))	701✔
107	continue;	2✔
108	if (strchr(COMMENTS, *line))	699✔
109	continue;	613✔
110
111	RET_GATHER(ret, modules_list_append_suffix(module_set, TAKE_PTR(line)));	86✔
112	}
113
114	return ret;	71✔
115	}
116
117	static int apply_file_from_path(const char path, OrderedSet *module_set) {	2✔
118	_cleanup_fclose_ FILE *f = NULL;	2✔
119	_cleanup_free_ char *pp = NULL;	2✔
120	int r;	2✔
121
122	assert(path);	2✔
123
124	r = search_and_fopen_nulstr(path, "re", NULL, conf_file_dirs, &f, &pp);	2✔
125	if (r < 0)	2✔
126	return log_error_errno(r, "Failed to open %s: %m", path);	1✔
127
128	return apply_file(f, pp, module_set);	1✔
129	}
130
131	static int apply_conf_file(ConfFile c, OrderedSet *module_set) {	70✔
132	_cleanup_fclose_ FILE *f = NULL;	70✔
133
134	f = fopen(FORMAT_PROC_FD_PATH(c->fd), "re");	70✔
135	if (!f) {	70✔
136	if (errno == ENOENT)	×
137	return 0;
138
139	return log_error_errno(errno, "Failed to open %s: %m", c->original_path);	×
140	}
141
142	return apply_file(f, c->original_path, module_set);	70✔
143	}
144
145	static int do_direct_probe(OrderedSet *module_set) {	67✔
146	_cleanup_(kmod_unrefp) struct kmod_ctx *ctx = NULL;	67✔
147	char *module;	67✔
148	int ret = 0, r;	67✔
149
150	r = module_setup_context(&ctx);	67✔
151	if (r < 0)	67✔
152	return log_error_errno(r, "Failed to initialize libkmod context: %m");	×
153
154	ORDERED_SET_FOREACH(module, module_set) {	133✔
155	r = module_load_and_warn(ctx, module, /* verbose= */ true);	66✔
156	if (r != -ENOENT)	66✔
157	RET_GATHER(ret, r);	66✔
158	}
159
160	return ret;	67✔
161	}
162
163	static int enqueue_module_to_load(int sock, const char *module) {	14✔
164	ssize_t bytes;	14✔
165
166	assert(sock >= 0);	14✔
167	assert(module);	14✔
168
169	bytes = send(sock, module, strlen(module), /* flags= */ 0);	14✔
170	if (bytes < 0)	14✔
171	return log_error_errno(errno, "Failed to send '%s' to thread pool: %m", module);	×
172
173	return 0;
174	}
175
176	static int dequeue_module_to_load(int sock, char *buffer, size_t buffer_len) {	20✔
177	ssize_t bytes;	20✔
178
179	assert(sock >= 0);	20✔
180	assert(buffer);	20✔
181
182	/* Dequeue one module to be loaded from the socket pair. In case no more
183	* modules are present, recv() will return 0. */
184	bytes = recv(sock, buffer, buffer_len, /* flags= */ 0);	20✔
185	if (bytes == 0)	20✔
186	return 0;
187	if (bytes < 0)	14✔
188	return negative_errno();	×
189	if ((size_t)bytes == buffer_len)	14✔
190	return -E2BIG;
191
192	buffer[bytes] = '\0';	14✔
193
194	return 1;	14✔
195	}
196
197	static int run_prober(int sock) {	6✔
198	_cleanup_(kmod_unrefp) struct kmod_ctx *ctx = NULL;	6✔
199	char buffer[MODULE_NAME_MAX_LEN + 1];	6✔
200	int ret = 0, r;	6✔
201
202	r = module_setup_context(&ctx);	6✔
203	if (r < 0)	6✔
204	return log_error_errno(r, "Failed to initialize libkmod context: %m");	×
205
206	for (;;) {	20✔
207	r = dequeue_module_to_load(sock, buffer, sizeof(buffer));	20✔
208	if (ERRNO_IS_NEG_TRANSIENT(r))	20✔
209	continue;	×
210	if (r == -E2BIG) {	20✔
211	log_warning_errno(SYNTHETIC_ERRNO(E2BIG), "Dequeued module name too long, proceeding anyway");	×
212	continue;	×
213	}
214	if (r < 0)	20✔
215	return log_error_errno(r, "Failed to receive from module queue: %m");	×
216	if (r == 0) {	20✔
217	log_debug("No more queued modules, terminate thread");	6✔
218	break;
219	}
220
221	r = module_load_and_warn(ctx, buffer, /* verbose= */ true);	14✔
222	if (r != -ENOENT)	14✔
223	RET_GATHER(ret, r);	6✔
224	}
225
226	return ret;
227	}
228
229	static void prober_thread(void arg) {	3✔
230	int sock = PTR_TO_FD(arg);	3✔
231	return INT_TO_PTR(run_prober(sock));	3✔
232	}
233
234	static int create_worker_threads(size_t n_threads, void arg, pthread_t ret_threads, size_t ret_n_threads) {	3✔
235	_cleanup_free_ pthread_t *new_threads = NULL;	3✔
236	size_t created_threads;	3✔
237	sigset_t ss, saved_ss;	3✔
238	int r;	3✔
239
240	assert(ret_threads);	3✔
241	assert(ret_n_threads);	3✔
242
243	if (n_threads == 0) {	3✔
244	*ret_threads = NULL;	×
245	*ret_n_threads = 0;	×
246	return 0;	×
247	}
248
249	/* Create worker threads with masked signals */
250	new_threads = new(pthread_t, n_threads);	3✔
251	if (!new_threads)	3✔
252	return log_oom();	×
253
254	/* No signals in worker threads. */
255	assert_se(sigfillset(&ss) >= 0);	3✔
256	r = pthread_sigmask(SIG_BLOCK, &ss, &saved_ss);	3✔
257	if (r != 0)	3✔
258	return log_error_errno(r, "Failed to mask signals for workers: %m");	×
259
260	for (created_threads = 0; created_threads < n_threads; ++created_threads) {	6✔
261	r = pthread_create(&new_threads[created_threads], /* attr= */ NULL, prober_thread, arg);	3✔
262	if (r != 0) {	3✔
263	log_error_errno(r, "Failed to create worker thread %zu: %m", created_threads);	×
264	break;
265	}
266	}
267
268	/* Restore the signal mask */
269	r = pthread_sigmask(SIG_SETMASK, &saved_ss, NULL);	3✔
270	if (r != 0)	3✔
271	log_warning_errno(r, "Failed to restore signal mask, ignoring: %m");	×
272
273	*ret_threads = TAKE_PTR(new_threads);	3✔
274	*ret_n_threads = created_threads;	3✔
275
276	return 0;	3✔
277	}
278
279	static int destroy_worker_threads(pthread_t **threads, size_t n_threads) {	3✔
280	int ret = 0, r;	3✔
281
282	assert(threads);	3✔
283	assert(n_threads == 0 \|\| *threads);	3✔
284
285	for (size_t i = 0; i < n_threads; ++i) {	6✔
286	void *p;	3✔
287	r = pthread_join((*threads)[i], &p);	3✔
288	if (r != 0)	3✔
289	RET_GATHER(ret, log_warning_errno(r, "Failed to join worker thread, proceeding anyway: %m"));	×
290	else
291	RET_GATHER(ret, PTR_TO_INT(p));	3✔
292	}
293
294	threads = mfree(threads);	3✔
295
296	return ret;	3✔
297	}
298
299	/* Determine number of workers, either from env or from online CPUs */
300	static unsigned determine_num_worker_threads(unsigned n_modules) {	70✔
301	unsigned n_threads = UINT_MAX;	70✔
302	int r;	70✔
303
304	if (n_modules == 0)	70✔
305	return 0;	70✔
306
307	const char *e = secure_getenv("SYSTEMD_MODULES_LOAD_NUM_THREADS");	69✔
308	if (e) {	69✔
309	r = safe_atou(e, &n_threads);	×
310	if (r < 0)	×
311	log_debug("Invalid value in $SYSTEMD_MODULES_LOAD_NUM_THREADS, ignoring: %s", e);	×
312	}
313
314	if (n_threads == UINT_MAX) {	69✔
315	/* By default, use a number of worker threads equal the number of online CPUs,
316	* but clamp it to avoid a probing storm on machines with many CPUs. */
317	long ncpus = sysconf(_SC_NPROCESSORS_ONLN);	69✔
318	if (ncpus < 0) {	69✔
319	log_warning_errno(errno, "Failed to get number of online CPUs, ignoring: %m");	×
320	ncpus = 1;
321	}
322
323	n_threads = CLAMP((unsigned)ncpus, 1U, 16U);	69✔
324	}
325
326	/* There's no reason to spawn more threads than the modules that need to be loaded */
327	n_threads = CLAMP(n_threads, 1U, n_modules);	69✔
328
329	/* One of the probe threads is the main process */
330	return n_threads - 1U;	69✔
331	}
332
333	static int help(void) {	1✔
334	_cleanup_free_ char *link = NULL;	1✔
335	_cleanup_(table_unrefp) Table *options = NULL;	1✔
336	int r;	1✔
337
338	if (terminal_urlify_man("systemd-modules-load.service", "8", &link) < 0)	1✔
339	return log_oom();	×
340
341	r = option_parser_get_help_table(&options);	1✔
342	if (r < 0)	1✔
343	return r;
344
345	printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"	1✔
346	"Loads statically configured kernel modules.\n\n",
347	program_invocation_short_name);
348
349	r = table_print_or_warn(options);	1✔
350	if (r < 0)	1✔
351	return r;
352
353	printf("\nSee the %s for details.\n", link);	1✔
354	return 0;
355	}
356
357	static int parse_argv(int argc, char argv[], char **ret_args) {	73✔
358	assert(argc >= 0);	73✔
359	assert(argv);	73✔
360	assert(ret_args);	73✔
361
362	OptionParser state = { argc, argv };	73✔
363
364	FOREACH_OPTION(&state, c, /* arg= / NULL, / on_error= */ return c)	73✔
365	switch (c) {	2✔
366
367	OPTION_COMMON_HELP:	1✔
368	return help();	1✔
369
370	OPTION_COMMON_VERSION:	1✔
371	return version();	1✔
372	}
373
374	*ret_args = option_parser_get_args(&state);	70✔
375	return 1;	70✔
376	}
377
378	static int run(int argc, char *argv[]) {	73✔
379	/* A OrderedSet instead of a plain Set is used here to make debug easier:
380	* in case a race condition is observed during module probing, the threading
381	* can be disabled through the SYSTEMD_MODULES_LOAD_NUM_THREADS environment
382	* variable and the modules reordered at will by the user that is debugging it.
383	* In that case, the probing order would be the same in which the modules
384	* appear inside the modules-load.d files (this wouldn't be true with a Set). */
385	_cleanup_ordered_set_free_ OrderedSet *module_set = NULL;	×
386	_cleanup_close_pair_ int pair[2] = EBADF_PAIR;	73✔
387	_cleanup_free_ pthread_t *threads = NULL;	73✔
388	size_t n_threads = 0;	73✔
389	char *module;	73✔
390	int ret = 0, r;	73✔
391
392	char **args = NULL;	73✔
393	r = parse_argv(argc, argv, &args);	73✔
394	if (r <= 0)	73✔
395	return r;
396
397	log_setup();	70✔
398
399	umask(0022);	70✔
400
401	r = proc_cmdline_parse(parse_proc_cmdline_item, /* userdata= */ NULL, PROC_CMDLINE_STRIP_RD_PREFIX);	70✔
402	if (r < 0)	70✔
403	log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m");	×
404
405	if (!strv_isempty(args)) {	70✔
406	STRV_FOREACH(i, args) {	4✔
407	r = apply_file_from_path(*i, &module_set);	2✔
408	if (r < 0)	2✔
409	RET_GATHER(ret, r);	1✔
410	}
411	} else {
412	ConfFile **files = NULL;	68✔
413	size_t n_files = 0;	68✔
414
415	CLEANUP_ARRAY(files, n_files, conf_file_free_array);	68✔
416
417	STRV_FOREACH(i, arg_proc_cmdline_modules)	70✔
418	RET_GATHER(ret, modules_list_append_dup(&module_set, *i));	2✔
419
420	r = conf_files_list_nulstr_full(".conf", /* root= */ NULL,	68✔
421	CONF_FILES_REGULAR \| CONF_FILES_FILTER_MASKED \| CONF_FILES_WARN,
422	conf_file_dirs, &files, &n_files);
423	if (r < 0)	68✔
424	RET_GATHER(ret, log_error_errno(r, "Failed to enumerate modules-load.d files: %m"));	×
425	else
426	FOREACH_ARRAY(cf, files, n_files)	138✔
427	RET_GATHER(ret, apply_conf_file(*cf, &module_set));	70✔
428	}
429
430	n_threads = determine_num_worker_threads((size_t) ordered_set_size(module_set));	70✔
431
432	/* If no additional thread is required, there is no need to create the
433	* thread pool or the mean to communicate with its members. */
434	if (n_threads == 0) {	70✔
435	log_debug("Single-threaded probe");	67✔
436	return RET_GATHER(ret, do_direct_probe(module_set));	67✔
437	}
438
439	/* Create a socketpair for communication with probe workers */
440	r = RET_NERRNO(socketpair(AF_UNIX, SOCK_SEQPACKET \| SOCK_CLOEXEC, /* protocol= */ 0, pair));	3✔
441	if (r < 0)	×
442	return log_error_errno(r, "Failed to create socket pair: %m");	×
443
444	/* Create threads, which will then wait for modules to probe. */
445	log_info("Using %zu probe threads", n_threads + 1);	3✔
446	r = create_worker_threads(n_threads, FD_TO_PTR(pair[1]), &threads, &n_threads);	3✔
447	if (r < 0)	3✔
448	log_warning_errno(r, "Failed to create probe threads, continuing as single-threaded probe");	×
449
450	/* Send modules to be probed */
451	ORDERED_SET_FOREACH(module, module_set)	17✔
452	RET_GATHER(ret, enqueue_module_to_load(pair[0], module));	14✔
453
454	/* Close one end of the socketpair; workers will run until the queue is empty */
455	pair[0] = safe_close(pair[0]);	3✔
456
457	/* Run the prober function also in original thread */
458	RET_GATHER(ret, run_prober(pair[1]));	3✔
459
460	/* Wait for all threads (if any) to finish and gather errors */
461	RET_GATHER(ret, destroy_worker_threads(&threads, n_threads));	3✔
462
463	return ret;
464	}
465
466	DEFINE_MAIN_FUNCTION(run);	73✔

systemd / systemd / 24809677062

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