Messages in this thread Patch in this message |  | | Date | Sun, 3 Sep 2000 13:27:32 +0100 | From | Alan Ford <> | Subject | [PATCH] Magic SysRq help |
| |
On more than one occasion I have been hit by a situation where I wished I could remember which Magic SysRq key to use. So I wrote the following patch: Alt+SysRq+h to print the list of keys, taken from the SysRq Documentation. I thought I'd share it here, hoping that other people would also find it useful. It's against 2.2.16 but probably works on many other kernel versions too.
--- linux/drivers/char/sysrq.c.vanilla Mon Jun 26 20:57:13 2000 +++ linux/drivers/char/sysrq.c Mon Jun 26 21:08:53 2000 @@ -67,6 +67,10 @@ console_loglevel = 7; printk(KERN_INFO "SysRq: "); switch (key) { + case 'h': /* H -- Help */ + printk("Help\n"); + print_sysrq_help(); + break; case 'r': /* R -- Reset raw mode */ if (kbd) { kbd->kbdmode = VC_XLATE; @@ -255,4 +259,22 @@ unlock_kernel(); printk(KERN_INFO "Done.\n"); +} + +static void print_sysrq_help(void) +{ + printk("'h' - This help information.\n"); + printk("'r' - Turns off keyboard raw mode and sets it to XLATE.\n"); + printk("'k' - Kills all programs on the current virtual console.\n"); + printk("'b' - Will immediately reboot the system without syncing or unmounting your disks.\n"); + printk("'o' - Will shut your system off (if configured and supported).\n"); + printk("'s' - Will attempt to sync all mounted filesystems.\n"); + printk("'u' - Will attempt to remount all mounted filesystems read-only.\n"); + printk("'p' - Will dump the current registers and flags to your console.\n"); + printk("'t' - Will dump a list of current tasks and their information to your console.\n"); + printk("'m' - Will dump current memory info to your console.\n"); + printk("'0'-'9' - Sets the console log level, controlling which kernel messages will be printed to your console.\n"); + printk("'e' - Send a SIGTERM to all processes, except for init.\n"); + printk("'i' - Send a SIGKILL to all processes, except for init.\n"); + printk("'l' - Send a SIGKILL to all processes, INCLUDING init.\n"); }
-- Alan Ford * alan@whirlnet.co.uk * DFax: +44 (0)870 1600868 WWW: http://www.whirlnet.co.uk/ * PGP: 0x8F807D7D * GPG: 0x673BA843 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
|  |