How to reboot Linux using a C programming language code ?

Hello,

Do you have maybe a reboot.c to reboot linux, using C?

gcc or clang.

Kind regards

https://github.com/torvalds/linux/bl...ernel/reboot.c <--- this is NOT LIGHT

For a large number of reasons, it is better to power off the machine using e.g. execl("/bin/shutdown", "shutdown", "-P", "now", (char *)0); or reboot using execl("/bin/shutdown", "shutdown", "-r", "now", (char *)0);

is really a highly crap answer

man execl

mytest.c

#include <unistd.h>

int main()
{
    execl("/bin/ls", "ls", "-a", (char*) NULL);
    return 0;
}

//gcc mytest.c -o mytest

This is closer to what you're looking for:

https://kernel.googlesource.com/pub/...ils/shutdown.c

Moved: This thread is more suitable in <Programming> and has been moved accordingly to help your thread/question get the exposure it deserves.

Originally Posted by teckk man execl mytest.c #include <unistd.h> int main() { execl("/bin/ls", "ls", "-a", (char*) NULL); return 0; } //gcc mytest.c -o mytest

it sucks totally, i.e. system( "/sbin/reboot" ) or execl isnt C programming...

https://man7.org/linux/man-pages/man2/reboot.2.html

Originally Posted by teckk man execl mytest.c #include <unistd.h> int main() { execl("/bin/ls", "ls", "-a", (char*) NULL); return 0; } //gcc mytest.c -o mytest

this above code is so much ugly man.

#include <unistd.h> #include <sys/reboot.h> int main() { reboot(RB_POWER_OFF); }

Some attempts... however it will power off

cc -static reboot.c -o myreboot

BTW, what is the actual problem to solve?

Did you try RB_AUTOBOOT ?

Hello this is Gulshan Negi
Well, the reboot function provided by the Linux system call interface can be used to reboot a Linux system using the C programming language.
Example:
#include <unistd.h>
#include <sys/reboot.h>

int main() {
int result = reboot(RB_AUTOBOOT); // initiate a system reboot

if (result == -1) {
perror("Reboot failed");
return 1;
} else {
printf("Rebooting...\n");
return 0;
}
}

I hope it will help you.
Thanks

As others have said, usually the best approach is to "exec" the reboot command. (Remember to handle the case where the user doesn't have the privilege to run it.)

And, "this being open-source Linux," you can examine the actual source code of this command to see precisely how it works.

Originally Posted by gulshan212 Hello this is Gulshan Negi Well, the reboot function provided by the Linux system call interface can be used to reboot a Linux system using the C programming language. Example: #include <unistd.h> #include <sys/reboot.h> int main() { int result = reboot(RB_AUTOBOOT); // initiate a system reboot if (result == -1) { perror("Reboot failed"); return 1; } else { printf("Rebooting...\n"); return 0; } } I hope it will help you. Thanks

Could it be done without reboot.h ?

#include <sys/reboot.h>

look shutdown.c does not have reboot.h

#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <utmp.h>
#include <time.h>
#include <string.h>
#include <ctype.h>
#include <signal.h>
#include <sys/param.h>
#include <termios.h>
#include <mntent.h>
#include <sys/mount.h>
#include <sys/wait.h>
#include <syslog.h>
#include <sys/resource.h>
#include "pathnames.h"