Use of su command in c code

Question

I want to use a command in my c code. This command works properly when i am a superuser in terminal (using su) but does not work when I use sudo. I gathered that I can use system() in my c code as follows

system("su -c \"mycommand\"")

myCommand is a command that sends input to some device, like (echo 1 > mydevice)

I compiled my c code using gcc and run the output file. The trouble is, it wants root password from terminal when it comes to this line. Is there a way I supply password programatically? I did it before with sudo command with -S option, but sudo command does not work for this case. If it is not possible, is there another way to deal with this?

Answer 1

试试这个，

system("sudo sh -c \"mycommand\"");