Mixing
C function to shutdown linux system
4
I am developing C function to shutdown my Embedded Linux system (Ubuntu) using the following way.
#include <stdlib.h>
int main()
{
system("shutdown -P now");
return 0;
}
Is this approach is secure?
If not is there any better and secure way I can perform same task?
c embedded-linux
edited Nov 21 '18 at 5:46
Swordfish
9,42311436
asked Nov 21 '18 at 5:35
raj123raj123
4916
|
show 3 more comments
4
I am developing C function to shutdown my Embedded Linux system (Ubuntu) using the following way.
#include <stdlib.h>
int main()
{
system("shutdown -P now");
return 0;
}
Is this approach is secure?
If not is there any better and secure way I can perform same task?
c embedded-linux
edited Nov 21 '18 at 5:46
Swordfish
9,42311436
asked Nov 21 '18 at 5:35
raj123raj123
4916
system()spawns a child process which is used to execute the command. I'd call reboot() directly. As for security please have a look at the comments to Why should the system() function be avoided in C and C++?
– Swordfish
Nov 21 '18 at 5:43
thanks got it we have to avoid system call.So how can I perform same functionality without system call?@Swordfish
– raj123
Nov 21 '18 at 6:00
I also read about reboot but couldn't getting it how can I use it to shutdown my system.@Swordfish
– raj123
Nov 21 '18 at 6:02
stackoverflow.com/a/31652816/3975177
– Swordfish
Nov 21 '18 at 6:10
It says system("/bin/sh shutdown -P now") also safe to use Is it?@Swordfish
– raj123
Nov 21 '18 at 6:18
|
show 3 more comments
4
4
4
I am developing C function to shutdown my Embedded Linux system (Ubuntu) using the following way.
#include <stdlib.h>
int main()
{
system("shutdown -P now");
return 0;
}
Is this approach is secure?
If not is there any better and secure way I can perform same task?
c embedded-linux
edited Nov 21 '18 at 5:46
Swordfish
9,42311436
asked Nov 21 '18 at 5:35
raj123raj123
4916
I am developing C function to shutdown my Embedded Linux system (Ubuntu) using the following way.
#include <stdlib.h>
int main()
{
system("shutdown -P now");
return 0;
}
Is this approach is secure?
If not is there any better and secure way I can perform same task?
c embedded-linux
c embedded-linux
edited Nov 21 '18 at 5:46
Swordfish
9,42311436
asked Nov 21 '18 at 5:35
raj123raj123
4916
edited Nov 21 '18 at 5:46
Swordfish
9,42311436
asked Nov 21 '18 at 5:35
raj123raj123
4916
edited Nov 21 '18 at 5:46
Swordfish
9,42311436
edited Nov 21 '18 at 5:46
Swordfish
9,42311436
edited Nov 21 '18 at 5:46
Swordfish
9,42311436
9,42311436
asked Nov 21 '18 at 5:35
raj123raj123
4916
asked Nov 21 '18 at 5:35
raj123raj123
4916
asked Nov 21 '18 at 5:35
raj123raj123
4916
4916
system()spawns a child process which is used to execute the command. I'd call reboot() directly. As for security please have a look at the comments to Why should the system() function be avoided in C and C++?
– Swordfish
Nov 21 '18 at 5:43
thanks got it we have to avoid system call.So how can I perform same functionality without system call?@Swordfish
– raj123
Nov 21 '18 at 6:00
I also read about reboot but couldn't getting it how can I use it to shutdown my system.@Swordfish
– raj123
Nov 21 '18 at 6:02
stackoverflow.com/a/31652816/3975177
– Swordfish
Nov 21 '18 at 6:10
It says system("/bin/sh shutdown -P now") also safe to use Is it?@Swordfish
– raj123
Nov 21 '18 at 6:18
|
show 3 more comments
system()spawns a child process which is used to execute the command. I'd call reboot() directly. As for security please have a look at the comments to Why should the system() function be avoided in C and C++?
– Swordfish
Nov 21 '18 at 5:43
thanks got it we have to avoid system call.So how can I perform same functionality without system call?@Swordfish
– raj123
Nov 21 '18 at 6:00
I also read about reboot but couldn't getting it how can I use it to shutdown my system.@Swordfish
– raj123
Nov 21 '18 at 6:02
stackoverflow.com/a/31652816/3975177
– Swordfish
Nov 21 '18 at 6:10
It says system("/bin/sh shutdown -P now") also safe to use Is it?@Swordfish
– raj123
Nov 21 '18 at 6:18
system() spawns a child process which is used to execute the command. I'd call reboot() directly. As for security please have a look at the comments to Why should the system() function be avoided in C and C++?– Swordfish
Nov 21 '18 at 5:43
system() spawns a child process which is used to execute the command. I'd call reboot() directly. As for security please have a look at the comments to Why should the system() function be avoided in C and C++?– Swordfish
Nov 21 '18 at 5:43
thanks got it we have to avoid system call.So how can I perform same functionality without system call?@Swordfish
– raj123
Nov 21 '18 at 6:00
thanks got it we have to avoid system call.So how can I perform same functionality without system call?@Swordfish
– raj123
Nov 21 '18 at 6:00
I also read about reboot but couldn't getting it how can I use it to shutdown my system.@Swordfish
– raj123
Nov 21 '18 at 6:02
I also read about reboot but couldn't getting it how can I use it to shutdown my system.@Swordfish
– raj123
Nov 21 '18 at 6:02
stackoverflow.com/a/31652816/3975177
– Swordfish
Nov 21 '18 at 6:10
stackoverflow.com/a/31652816/3975177
– Swordfish
Nov 21 '18 at 6:10
It says system("/bin/sh shutdown -P now") also safe to use Is it?@Swordfish
– raj123
Nov 21 '18 at 6:18
It says system("/bin/sh shutdown -P now") also safe to use Is it?@Swordfish
– raj123
Nov 21 '18 at 6:18
|
show 3 more comments
1 Answer
1
active
oldest
votes
1
man reboot(2)
#include <unistd.h>
#include <sys/reboot.h>
int main () {
sync(); // If reboot() not preceded by a sync(), data will be lost.
setuid(0); // set uid to root, the running uid must already have the
// appropriate permissions to do this.
reboot(RB_AUTOBOOT); // note, this reboots the system, it's not as
return(0); // graceful as asking the init system to reboot.
}
Pre-systemd, you could also sometimes get away with:
int main() {
sync();
kill(1, SIGTERM);
return 0;
}
This method was more prevalent on embedded systems where the program is run under a single shell, but killing initd was effective as well. Note that on newer GNU/Linux's that use systemd/upstart, SIGTERM is ignored by systemd.
answered Dec 20 '18 at 3:43
Cinder BiscuitsCinder Biscuits
2,3681324
got it thanks. but to use this we need have to use setcap cap_sys_boot+ep executabe_file @Cinder Biscuits
– raj123
Dec 20 '18 at 21:56
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
1
man reboot(2)
#include <unistd.h>
#include <sys/reboot.h>
int main () {
sync(); // If reboot() not preceded by a sync(), data will be lost.
setuid(0); // set uid to root, the running uid must already have the
// appropriate permissions to do this.
reboot(RB_AUTOBOOT); // note, this reboots the system, it's not as
return(0); // graceful as asking the init system to reboot.
}
Pre-systemd, you could also sometimes get away with:
int main() {
sync();
kill(1, SIGTERM);
return 0;
}
This method was more prevalent on embedded systems where the program is run under a single shell, but killing initd was effective as well. Note that on newer GNU/Linux's that use systemd/upstart, SIGTERM is ignored by systemd.
answered Dec 20 '18 at 3:43
Cinder BiscuitsCinder Biscuits
2,3681324
got it thanks. but to use this we need have to use setcap cap_sys_boot+ep executabe_file @Cinder Biscuits
– raj123
Dec 20 '18 at 21:56
add a comment |
1
man reboot(2)
#include <unistd.h>
#include <sys/reboot.h>
int main () {
sync(); // If reboot() not preceded by a sync(), data will be lost.
setuid(0); // set uid to root, the running uid must already have the
// appropriate permissions to do this.
reboot(RB_AUTOBOOT); // note, this reboots the system, it's not as
return(0); // graceful as asking the init system to reboot.
}
Pre-systemd, you could also sometimes get away with:
int main() {
sync();
kill(1, SIGTERM);
return 0;
}
This method was more prevalent on embedded systems where the program is run under a single shell, but killing initd was effective as well. Note that on newer GNU/Linux's that use systemd/upstart, SIGTERM is ignored by systemd.
answered Dec 20 '18 at 3:43
Cinder BiscuitsCinder Biscuits
2,3681324
got it thanks. but to use this we need have to use setcap cap_sys_boot+ep executabe_file @Cinder Biscuits
– raj123
Dec 20 '18 at 21:56
add a comment |
1
1
1
man reboot(2)
#include <unistd.h>
#include <sys/reboot.h>
int main () {
sync(); // If reboot() not preceded by a sync(), data will be lost.
setuid(0); // set uid to root, the running uid must already have the
// appropriate permissions to do this.
reboot(RB_AUTOBOOT); // note, this reboots the system, it's not as
return(0); // graceful as asking the init system to reboot.
}
Pre-systemd, you could also sometimes get away with:
int main() {
sync();
kill(1, SIGTERM);
return 0;
}
This method was more prevalent on embedded systems where the program is run under a single shell, but killing initd was effective as well. Note that on newer GNU/Linux's that use systemd/upstart, SIGTERM is ignored by systemd.
answered Dec 20 '18 at 3:43
Cinder BiscuitsCinder Biscuits
2,3681324
man reboot(2)
#include <unistd.h>
#include <sys/reboot.h>
int main () {
sync(); // If reboot() not preceded by a sync(), data will be lost.
setuid(0); // set uid to root, the running uid must already have the
// appropriate permissions to do this.
reboot(RB_AUTOBOOT); // note, this reboots the system, it's not as
return(0); // graceful as asking the init system to reboot.
}
Pre-systemd, you could also sometimes get away with:
int main() {
sync();
kill(1, SIGTERM);
return 0;
}
This method was more prevalent on embedded systems where the program is run under a single shell, but killing initd was effective as well. Note that on newer GNU/Linux's that use systemd/upstart, SIGTERM is ignored by systemd.
answered Dec 20 '18 at 3:43
Cinder BiscuitsCinder Biscuits
2,3681324
answered Dec 20 '18 at 3:43
Cinder BiscuitsCinder Biscuits
2,3681324
answered Dec 20 '18 at 3:43
Cinder BiscuitsCinder Biscuits
2,3681324
answered Dec 20 '18 at 3:43
Cinder BiscuitsCinder Biscuits
2,3681324
2,3681324
got it thanks. but to use this we need have to use setcap cap_sys_boot+ep executabe_file @Cinder Biscuits
– raj123
Dec 20 '18 at 21:56
add a comment |
got it thanks. but to use this we need have to use setcap cap_sys_boot+ep executabe_file @Cinder Biscuits
– raj123
Dec 20 '18 at 21:56
got it thanks. but to use this we need have to use setcap cap_sys_boot+ep executabe_file @Cinder Biscuits
– raj123
Dec 20 '18 at 21:56
got it thanks. but to use this we need have to use setcap cap_sys_boot+ep executabe_file @Cinder Biscuits
– raj123
Dec 20 '18 at 21:56
add a comment |
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system()spawns a child process which is used to execute the command. I'd call reboot() directly. As for security please have a look at the comments to Why should the system() function be avoided in C and C++?– Swordfish
Nov 21 '18 at 5:43
thanks got it we have to avoid system call.So how can I perform same functionality without system call?@Swordfish
– raj123
Nov 21 '18 at 6:00
I also read about reboot but couldn't getting it how can I use it to shutdown my system.@Swordfish
– raj123
Nov 21 '18 at 6:02
stackoverflow.com/a/31652816/3975177
– Swordfish
Nov 21 '18 at 6:10
It says system("/bin/sh shutdown -P now") also safe to use Is it?@Swordfish
– raj123
Nov 21 '18 at 6:18