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reboot (2)
  • reboot (1) ( Solaris man: Команды и прикладные программы пользовательского уровня )
  • reboot (2) ( FreeBSD man: Системные вызовы )
  • reboot (2) ( Русские man: Системные вызовы )
  • >> reboot (2) ( Linux man: Системные вызовы )
  • reboot (3) ( Solaris man: Библиотечные вызовы )
  • reboot (8) ( FreeBSD man: Команды системного администрирования )
  • reboot (8) ( Linux man: Команды системного администрирования )
  •  

    NAME

    reboot - reboot or enable/disable Ctrl-Alt-Del
     
    

    SYNOPSIS

    /* For libc4 and libc5 the library call and the system call
       are identical, and since kernel version 2.1.30 there are
       symbolic names LINUX_REBOOT_* for the constants and a
       fourth argument to the call: */

    #include <unistd.h>
    #include <linux/reboot.h>

    int reboot(int magic, int magic2, int cmd, void *arg);

    /* Under glibc some of the constants involved have gotten
       symbolic names RB_*, and the library call is a 1-argument
       wrapper around the 3-argument system call: */

    #include <unistd.h>
    #include <sys/reboot.h>

    int reboot(int cmd);  

    DESCRIPTION

    The reboot() call reboots the system, or enables/disables the reboot keystroke (abbreviated CAD, since the default is Ctrl-Alt-Delete; it can be changed using loadkeys(1)).

    This system call will fail (with EINVAL) unless magic equals LINUX_REBOOT_MAGIC1 (that is, 0xfee1dead) and magic2 equals LINUX_REBOOT_MAGIC2 (that is, 672274793). However, since 2.1.17 also LINUX_REBOOT_MAGIC2A (that is, 85072278) and since 2.1.97 also LINUX_REBOOT_MAGIC2B (that is, 369367448) and since 2.5.71 also LINUX_REBOOT_MAGIC2C (that is, 537993216) are permitted as value for magic2. (The hexadecimal values of these constants are meaningful.) The cmd argument can have the following values:

    LINUX_REBOOT_CMD_RESTART
    (RB_AUTOBOOT, 0x1234567). The message "Restarting system." is printed, and a default restart is performed immediately. If not preceded by a sync(2), data will be lost.
    LINUX_REBOOT_CMD_HALT
    (RB_HALT_SYSTEM, 0xcdef0123; since 1.1.76). The message "System halted." is printed, and the system is halted. Control is given to the ROM monitor, if there is one. If not preceded by a sync(2), data will be lost.
    LINUX_REBOOT_CMD_POWER_OFF
    (0x4321fedc; since 2.1.30). The message "Power down." is printed, the system is stopped, and all power is removed from the system, if possible. If not preceded by a sync(2), data will be lost.
    LINUX_REBOOT_CMD_RESTART2
    (0xa1b2c3d4; since 2.1.30). The message "Restarting system with command aq%saq" is printed, and a restart (using the command string given in arg) is performed immediately. If not preceded by a sync(2), data will be lost.
    LINUX_REBOOT_CMD_CAD_ON
    (RB_ENABLE_CAD, 0x89abcdef). CAD is enabled. This means that the CAD keystroke will immediately cause the action associated with LINUX_REBOOT_CMD_RESTART.
    LINUX_REBOOT_CMD_CAD_OFF
    (RB_DISABLE_CAD, 0). CAD is disabled. This means that the CAD keystroke will cause a SIGINT signal to be sent to init (process 1), whereupon this process may decide upon a proper action (maybe: kill all processes, sync, reboot).

    Only the superuser may call reboot().

    The precise effect of the above actions depends on the architecture. For the i386 architecture, the additional argument does not do anything at present (2.1.122), but the type of reboot can be determined by kernel command-line arguments ("reboot=...") to be either warm or cold, and either hard or through the BIOS.  

    RETURN VALUE

    For the values of cmd that stop or restart the system, a successful call to reboot() does not return. For the other cmd values, zero is returned on success. In all cases, -1 is returned on failure, and errno is set appropriately.  

    ERRORS

    EFAULT
    Problem with getting userspace data under LINUX_REBOOT_CMD_RESTART2.
    EINVAL
    Bad magic numbers or cmd.
    EPERM
    The calling process has insufficient privilege to call reboot(); the CAP_SYS_BOOT capability is required.
     

    CONFORMING TO

    reboot() is Linux-specific, and should not be used in programs intended to be portable.  

    SEE ALSO

    sync(2), bootparam(7), capabilities(7), ctrlaltdel(8), halt(8), reboot(8)  

    COLOPHON

    This page is part of release 3.14 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUE
    ERRORS
    CONFORMING TO
    SEE ALSO
    COLOPHON


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