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-rw-r--r--kernel/sys.c58
-rw-r--r--kernel/sysctl.c10
2 files changed, 68 insertions, 0 deletions
diff --git a/kernel/sys.c b/kernel/sys.c
index 4d141ae3e802..aeded9ad66ce 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -2286,3 +2286,61 @@ asmlinkage long sys_getcpu(unsigned __user *cpup, unsigned __user *nodep,
2286 } 2286 }
2287 return err ? -EFAULT : 0; 2287 return err ? -EFAULT : 0;
2288} 2288}
2289
2290char poweroff_cmd[POWEROFF_CMD_PATH_LEN] = "/sbin/poweroff";
2291
2292static void argv_cleanup(char **argv, char **envp)
2293{
2294 argv_free(argv);
2295}
2296
2297/**
2298 * orderly_poweroff - Trigger an orderly system poweroff
2299 * @force: force poweroff if command execution fails
2300 *
2301 * This may be called from any context to trigger a system shutdown.
2302 * If the orderly shutdown fails, it will force an immediate shutdown.
2303 */
2304int orderly_poweroff(bool force)
2305{
2306 int argc;
2307 char **argv = argv_split(GFP_ATOMIC, poweroff_cmd, &argc);
2308 static char *envp[] = {
2309 "HOME=/",
2310 "PATH=/sbin:/bin:/usr/sbin:/usr/bin",
2311 NULL
2312 };
2313 int ret = -ENOMEM;
2314 struct subprocess_info *info;
2315
2316 if (argv == NULL) {
2317 printk(KERN_WARNING "%s failed to allocate memory for \"%s\"\n",
2318 __func__, poweroff_cmd);
2319 goto out;
2320 }
2321
2322 info = call_usermodehelper_setup(argv[0], argv, envp);
2323 if (info == NULL) {
2324 argv_free(argv);
2325 goto out;
2326 }
2327
2328 call_usermodehelper_setcleanup(info, argv_cleanup);
2329
2330 ret = call_usermodehelper_exec(info, -1);
2331
2332 out:
2333 if (ret && force) {
2334 printk(KERN_WARNING "Failed to start orderly shutdown: "
2335 "forcing the issue\n");
2336
2337 /* I guess this should try to kick off some daemon to
2338 sync and poweroff asap. Or not even bother syncing
2339 if we're doing an emergency shutdown? */
2340 emergency_sync();
2341 kernel_power_off();
2342 }
2343
2344 return ret;
2345}
2346EXPORT_SYMBOL_GPL(orderly_poweroff);
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 7063ebc6db05..44a1d699aad7 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -46,6 +46,7 @@
46#include <linux/syscalls.h> 46#include <linux/syscalls.h>
47#include <linux/nfs_fs.h> 47#include <linux/nfs_fs.h>
48#include <linux/acpi.h> 48#include <linux/acpi.h>
49#include <linux/reboot.h>
49 50
50#include <asm/uaccess.h> 51#include <asm/uaccess.h>
51#include <asm/processor.h> 52#include <asm/processor.h>
@@ -705,6 +706,15 @@ static ctl_table kern_table[] = {
705 .proc_handler = &proc_dointvec, 706 .proc_handler = &proc_dointvec,
706 }, 707 },
707#endif 708#endif
709 {
710 .ctl_name = CTL_UNNUMBERED,
711 .procname = "poweroff_cmd",
712 .data = &poweroff_cmd,
713 .maxlen = POWEROFF_CMD_PATH_LEN,
714 .mode = 0644,
715 .proc_handler = &proc_dostring,
716 .strategy = &sysctl_string,
717 },
708 718
709 { .ctl_name = 0 } 719 { .ctl_name = 0 }
710}; 720};