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authorLennart Poettering <lennart@poettering.net>2010-05-22 00:29:53 +0200
committerLennart Poettering <lennart@poettering.net>2010-05-22 00:29:53 +0200
commit11c3a4eeb7e65eccd6fc0870bb1cda315fa33ba5 (patch)
tree139deea916d530f19dda6a2c0f6e1ac28f626314 /src/kmod-setup.c
parente962f5c34f8e292090fa8c7cb265106a621c8735 (diff)
kmod: automatically load a few kernel modules we need for normal operation before udev is active
Diffstat (limited to 'src/kmod-setup.c')
-rw-r--r--src/kmod-setup.c107
1 files changed, 107 insertions, 0 deletions
diff --git a/src/kmod-setup.c b/src/kmod-setup.c
new file mode 100644
index 0000000000..fa856c9a6c
--- /dev/null
+++ b/src/kmod-setup.c
@@ -0,0 +1,107 @@
+/*-*- Mode: C; c-basic-offset: 8 -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2010 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <sys/wait.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+
+#include "macro.h"
+#include "execute.h"
+
+#include "kmod-setup.h"
+
+static const char * const kmod_table[] = {
+ "autofs4", "/sys/class/misc/autofs",
+ "ipv6", "/sys/module/ipv6"
+};
+
+int kmod_setup(void) {
+ unsigned i, n = 0;
+ const char * cmdline[3 + ELEMENTSOF(kmod_table) + 1];
+ ExecCommand command;
+ ExecContext context;
+ pid_t pid;
+ int status, r;
+
+ for (i = 0; i < ELEMENTSOF(kmod_table); i += 2) {
+
+ if (access(kmod_table[i+1], F_OK) >= 0)
+ continue;
+
+ log_info("Your kernel apparently lacks built-in %s support. Please fix that. "
+ "We'll now try to work around this by calling '/sbin/modprobe %s'...",
+ kmod_table[i], kmod_table[i]);
+
+ cmdline[3 + n++] = kmod_table[i];
+ }
+
+ if (n <= 0)
+ return 0;
+
+ cmdline[0] = "/sbin/modprobe";
+ cmdline[1] = "-qab";
+ cmdline[2] = "--";
+ cmdline[3 + n] = NULL;
+
+ zero(command);
+ zero(context);
+
+ command.path = (char*) cmdline[0];
+ command.argv = (char**) cmdline;
+
+ exec_context_init(&context);
+ r = exec_spawn(&command, NULL, &context, NULL, 0, NULL, false, false, false, NULL, &pid);
+ exec_context_done(&context);
+
+ if (r < 0)
+ return r;
+
+ for (;;) {
+ if (waitpid(pid, &status, 0) < 0) {
+
+ if (errno == EINTR)
+ continue;
+
+ return -errno;
+ }
+
+ break;
+ }
+
+ if (WIFEXITED(status)) {
+ if (WEXITSTATUS(status) != 0) {
+ log_warning("/sbin/modprobe failed with error code %i.", WEXITSTATUS(status));
+ return -EPROTO;
+ }
+
+ log_debug("/sbin/modprobe succeeded.");
+ return 0;
+ }
+
+ if (WIFSIGNALED(status)) {
+ log_warning("/sbin/modprobe terminated by signal %s.", strsignal(WTERMSIG(status)));
+ return -EPROTO;
+ }
+
+ log_warning("/sbin/modprobe failed due to unknown reason.");
+ return -EPROTO;
+}