Question

I am trying to access /proc/net/dev file with -r--r--r-- 1 root root 0 privileges using popen. The code is as fairly as:

main(){
FILE *f;
f=popen("/proc/net/dev","r");
pclose(f);}

logged in as a root,after compiling & running the program, I get this:

sh: /proc/net/dev: Permission denied.

Can you please help me through this problem?
thank you

Answer 1

popen() is for opening a pipe to another process, the path provided must be to an executable file, not a device entry. You probably want open() or fopen() instead.