Differences

This shows you the differences between two versions of the page.

--- lk_usermodehelper [2019/02/14 15:12] – [drivers/video/fbdev/uvesafb.c] rpjday
+++ lk_usermodehelper [2019/02/14 15:18] (current) – [init/do_mounts_initrd.c] rpjday
@@ Line 308: / Line 308: @@
         return call_usermodehelper(critical_overtemp_path,
                                    argv, envp, UMH_WAIT_EXEC);
+}
+</code>
+==== init/do_mounts_initrd.c ====
+<code>
+static void __init handle_initrd(void)
+{
+        struct subprocess_info *info;
+        static char *argv[] = { "linuxrc", NULL, };
+        extern char *envp_init[];
+        int error;
+        real_root_dev = new_encode_dev(ROOT_DEV);
+        create_dev("/dev/root.old", Root_RAM0);
+        /* mount initrd on rootfs' /root */
+        mount_block_root("/dev/root.old", root_mountflags & ~MS_RDONLY);
+        ksys_mkdir("/old", 0700);
+        ksys_chdir("/old");
+        /*
+         * In case that a resume from disk is carried out by linuxrc or one of
+         * its children, we need to tell the freezer not to wait for us.
+         */
+        current->flags |= PF_FREEZER_SKIP;
+        info = call_usermodehelper_setup("/linuxrc", argv, envp_init,
+                                         GFP_KERNEL, init_linuxrc, NULL, NULL);
+        if (!info)
+                return;
+        call_usermodehelper_exec(info, UMH_WAIT_PROC);
+        ...
+</code>
+==== kernel/reboot.c ====
+<code>
+char poweroff_cmd[POWEROFF_CMD_PATH_LEN] = "/sbin/poweroff";
+static const char reboot_cmd[] = "/sbin/reboot";
+static int run_cmd(const char *cmd)
+{
+        char **argv;
+        static char *envp[] = {
+                "HOME=/",
+                "PATH=/sbin:/bin:/usr/sbin:/usr/bin",
+                NULL
+        };
+        int ret;
+        argv = argv_split(GFP_KERNEL, cmd, NULL);
+        if (argv) {
+                ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_EXEC);
+                argv_free(argv);
+        } else {
+                ret = -ENOMEM;
+        }
+        return ret;
 }
 </code>