How can I print file path in C inside Minix OS? [closed] - c

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I have to edit the exec syscall inside the Minix OS, in a way that every process created by it should print the program file path + program name:
for example, if I type ls inside the terminal, the next line should show me path/to/ls/ls
always in this format: filepath/programName.
I already managed to print the program name, but I am having problems with the file path. Can somebody show me how can I print it?
here is the code for sys_exec.c:
#include "syslib.h"
#include "stdio.h" //I included this library
int sys_exec(endpoint_t proc_ep, vir_bytes stack_ptr, vir_bytes progname,
vir_bytes pc, vir_bytes ps_str)
{
/* A process has exec'd. Tell the kernel. */
message m;
m.m_lsys_krn_sys_exec.endpt = proc_ep;
m.m_lsys_krn_sys_exec.stack = stack_ptr;
m.m_lsys_krn_sys_exec.name = progname;
m.m_lsys_krn_sys_exec.ip = pc;
m.m_lsys_krn_sys_exec.ps_str = ps_str;
//edited by me
puts((char*)progname);//this prints the program name
return _kernel_call(SYS_EXEC, &m);
}
and some image as reference:
this is what happens when I type ls

Answer 1

I was on the wrong path, the file I needed to edit was \usr\src\minix\minix\servers\vfs\exec.c, I was trying to edit \usr\src\minix\minix\lib\libsys\sys_exec.c.
Inside the right file I had access to a variable called fullpath inside the get_read_vp function. I imported stdio.h and then typed printf("executing: %s\n", fullpath); inside the function.