Hi,
I am using a Colibri iMX7 with a Yocto Linux image running on it. After installing the Linux I can get the IP address with ifconfig in the terminal before installing my program, so I know what is my IP address. The problem I am having trouble with, is that I have a code written in C that runs on the A7 core, and I want to get my IP from my code to display it on our screen. I could just set the IP that I know from the ifconfig command, but since I work with many boards, I need to have a code that will do it for all.
I am using the following function to get the IP address with no success:
void get_my_ip(char* ip)
{
char command[] = "/sbin/ifconfig eth0 | grep 'inet addr' | cut -d: -f2 | awk '{print $1}'";
//
FILE *file_ptr;
file_ptr = popen(command,"r");
char* ret;
if(ip!=NULL){
ret = fgets(ip, 19, file_ptr);
}
else{
return;
}
if (pclose(file_ptr) != 0){
fprintf(stderr," Error: Failed to close command stream (/proc/uptime) \n");
}
}
The function should return to my ip variable the board ip (e.g. 192.168.1.123). I can see that the path /sbin/ifconfig is there, but it will return nothing.
Coud someone help me with this issue or provide any info of how could I get the board IP address in C?
Thank you.