static ssize_t acpi_system_write_sleep ( struct file *file, const char __user *buffer, size_t count, loff_t *ppos) { char str[12]; u32 state = 0; int error = 0; if (count > sizeof(str) - 1) goto Done; memset(str,0,sizeof(str)); if (copy_from_user(str, buffer, count)) return -EFAULT; /* Check for S4 bios request */ if (!strcmp(str,"4b")) { error = acpi_suspend(4); goto Done; } state = simple_strtoul(str, NULL, 0); #ifdef CONFIG_SOFTWARE_SUSPEND if (state == 4) { software_suspend(); goto Done; } #endif error = acpi_suspend(state); Done: return error ? error : count; }
/* * Reboot system call: for obvious reasons only root may call it, * and even root needs to set up some magic numbers in the registers * so that some mistake won't make this reboot the whole machine. * You can also set the meaning of the ctrl-alt-del-key here. * * reboot doesn't sync: do that yourself before calling this. */ asmlinkage long sys_reboot(int magic1, int magic2, unsigned int cmd, void __user * arg) { char buffer[256]; /* We only trust the superuser with rebooting the system. */ if (!capable(CAP_SYS_BOOT)) return -EPERM; /* For safety, we require "magic" arguments. */ if (magic1 != LINUX_REBOOT_MAGIC1 || (magic2 != LINUX_REBOOT_MAGIC2 && magic2 != LINUX_REBOOT_MAGIC2A && magic2 != LINUX_REBOOT_MAGIC2B && magic2 != LINUX_REBOOT_MAGIC2C)) return -EINVAL; lock_kernel(); switch (cmd) { case LINUX_REBOOT_CMD_RESTART: notifier_call_chain(&reboot_notifier_list, SYS_RESTART, NULL); system_state = SYSTEM_RESTART; device_shutdown(); printk(KERN_EMERG "Restarting system.\n"); machine_restart(NULL); break; case LINUX_REBOOT_CMD_CAD_ON: C_A_D = 1; break; case LINUX_REBOOT_CMD_CAD_OFF: C_A_D = 0; break; case LINUX_REBOOT_CMD_HALT: notifier_call_chain(&reboot_notifier_list, SYS_HALT, NULL); system_state = SYSTEM_HALT; device_shutdown(); printk(KERN_EMERG "System halted.\n"); machine_halt(); unlock_kernel(); do_exit(0); break; case LINUX_REBOOT_CMD_POWER_OFF: notifier_call_chain(&reboot_notifier_list, SYS_POWER_OFF, NULL); system_state = SYSTEM_POWER_OFF; device_shutdown(); printk(KERN_EMERG "Power down.\n"); machine_power_off(); unlock_kernel(); do_exit(0); break; case LINUX_REBOOT_CMD_RESTART2: if (strncpy_from_user(&buffer[0], arg, sizeof(buffer) - 1) < 0) { unlock_kernel(); return -EFAULT; } buffer[sizeof(buffer) - 1] = '\0'; notifier_call_chain(&reboot_notifier_list, SYS_RESTART, buffer); system_state = SYSTEM_RESTART; device_shutdown(); printk(KERN_EMERG "Restarting system with command '%s'.\n", buffer); machine_restart(buffer); break; #ifdef CONFIG_SOFTWARE_SUSPEND case LINUX_REBOOT_CMD_SW_SUSPEND: { int ret = software_suspend(); unlock_kernel(); return ret; } #endif default: unlock_kernel(); return -EINVAL; } unlock_kernel(); return 0; }
/* * Reboot system call: for obvious reasons only root may call it, * and even root needs to set up some magic numbers in the registers * so that some mistake won't make this reboot the whole machine. * You can also set the meaning of the ctrl-alt-del-key here. * * reboot doesn't sync: do that yourself before calling this. */ asmlinkage long sys_reboot(int magic1, int magic2, unsigned int cmd, void __user * arg) { char buffer[256]; /* We only trust the superuser with rebooting the system. */ if (!capable(CAP_SYS_BOOT)) return -EPERM; /* For safety, we require "magic" arguments. */ if (magic1 != LINUX_REBOOT_MAGIC1 || (magic2 != LINUX_REBOOT_MAGIC2 && magic2 != LINUX_REBOOT_MAGIC2A && magic2 != LINUX_REBOOT_MAGIC2B && magic2 != LINUX_REBOOT_MAGIC2C)) return -EINVAL; lock_kernel(); switch (cmd) { case LINUX_REBOOT_CMD_RESTART: kernel_restart(NULL); break; case LINUX_REBOOT_CMD_CAD_ON: C_A_D = 1; break; case LINUX_REBOOT_CMD_CAD_OFF: C_A_D = 0; break; case LINUX_REBOOT_CMD_HALT: kernel_halt(); unlock_kernel(); do_exit(0); break; case LINUX_REBOOT_CMD_POWER_OFF: kernel_power_off(); unlock_kernel(); do_exit(0); break; case LINUX_REBOOT_CMD_RESTART2: if (strncpy_from_user(&buffer[0], arg, sizeof(buffer) - 1) < 0) { unlock_kernel(); return -EFAULT; } buffer[sizeof(buffer) - 1] = '\0'; kernel_restart(buffer); break; case LINUX_REBOOT_CMD_KEXEC: kernel_kexec(); unlock_kernel(); return -EINVAL; #ifdef CONFIG_SOFTWARE_SUSPEND case LINUX_REBOOT_CMD_SW_SUSPEND: { int ret = software_suspend(); unlock_kernel(); return ret; } #endif default: unlock_kernel(); return -EINVAL; } unlock_kernel(); return 0; }