Messages in this thread | | | From | Denis Vlasenko <> | Subject | Re: Forcing an immediate reboot | Date | Sat, 15 Oct 2005 13:24:51 +0300 |
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On Saturday 15 October 2005 04:46, Marc Perkel wrote: > Is there any way to force an immediate reboot as if to push the reset > button in software? Got a remote server that i need to reboot and > shutdown isn't working.
See atttached -- vda /* Including <unistd.h> makes sure that on a glibc system <features.h> is included, which again defines __GLIBC__ */
#include <unistd.h> #include <stdio.h> /* puts */ #include <time.h> /* nanosleep */ #include <errno.h>
#include "linux_reboot.h" /* reboot magic */
#define USE_LIBC
#ifdef USE_LIBC
/* libc version */ #if defined __GLIBC__ && __GLIBC__ >= 2 # include <sys/reboot.h> # define REBOOT(cmd) reboot(cmd) #else extern int reboot(int, int, int); # define REBOOT(cmd) reboot(LINUX_REBOOT_MAGIC1,LINUX_REBOOT_MAGIC2,(cmd)) #endif
int my_reboot(int cmd) { return REBOOT(cmd); }
#else /* no USE_LIBC */
/* direct syscall version */ #include <linux/unistd.h>
#ifdef _syscall3 _syscall3(int, reboot, int, magic, int, magic_too, int, cmd); #else /* Let us hope we have a 3-argument reboot here */ extern int reboot(int, int, int); #endif
int my_reboot(int cmd) { return reboot(LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2, cmd); }
#endif
void do_reboot() { my_reboot(LINUX_REBOOT_CMD_RESTART); }
void do_poweroff() { my_reboot(LINUX_REBOOT_CMD_POWER_OFF); }
void do_halt() { my_reboot(LINUX_REBOOT_CMD_HALT); }
void usage() { puts( "Usage: hardshutdown -h|-r|-p [NN]\n" " NN - seconds to sleep before requested action" ); exit(1); }
enum action_t { SHUTDOWN, // do nothing HALT, POWEROFF, REBOOT };
int main(int argc, char *argv[]) { struct timespec t = {0,0}; enum action_t action = SHUTDOWN; int c, i; char *prog, *ptr;
//if(*argv[0] == '-') argv[0]++; /* allow shutdown as login shell */ prog = argv[0]; if( (ptr=strrchr(prog,'/')) != 0 ) prog = ptr+1;
/* All names (halt, reboot, shutdown) refer to the same program with the same options, only the defaults differ. */ if(!strcmp("hardhalt", prog)) { action = HALT; } else if(!strcmp("hardpoweroff", prog)) { action = POWEROFF; } else if(!strcmp("hardreboot", prog)) { action = REBOOT; } for(c=1; c < argc; c++) { if(argv[c][0] >= '0' && argv[c][0] <= '9') { t.tv_sec = strtol(argv[c], NULL, 10); continue; } if(argv[c][0] != '-') { usage(); return 1; } for(i=1; argv[c][i]; i++) { switch(argv[c][i]) { case 'h': action = HALT; break; case 'p': action = POWEROFF; break; case 'r': action = REBOOT; break; default: usage(); return 1; } } }
if(action==SHUTDOWN) { usage(); return 1; }
chdir("/"); while(nanosleep(&t,&t)<0) if(errno!=EINTR) break;
switch(action) { case HALT: do_halt(); break; case POWEROFF: do_poweroff(); break; case REBOOT: do_reboot(); break; } return 1; } /* * Magic values required to use _reboot() system call. */
#define LINUX_REBOOT_MAGIC1 0xfee1dead #define LINUX_REBOOT_MAGIC2 672274793 #define LINUX_REBOOT_MAGIC2A 85072278 #define LINUX_REBOOT_MAGIC2B 369367448
/* * Commands accepted by the _reboot() system call. * * RESTART Restart system using default command and mode. * HALT Stop OS and give system control to ROM monitor, if any. * CAD_ON Ctrl-Alt-Del sequence causes RESTART command. * CAD_OFF Ctrl-Alt-Del sequence sends SIGINT to init task. * POWER_OFF Stop OS and remove all power from system, if possible. * RESTART2 Restart system using given command string. */
#define LINUX_REBOOT_CMD_RESTART 0x01234567 #define LINUX_REBOOT_CMD_HALT 0xCDEF0123 #define LINUX_REBOOT_CMD_CAD_ON 0x89ABCDEF #define LINUX_REBOOT_CMD_CAD_OFF 0x00000000 #define LINUX_REBOOT_CMD_POWER_OFF 0x4321FEDC #define LINUX_REBOOT_CMD_RESTART2 0xA1B2C3D4 [unhandled content-type:application/x-shellscript] | |