[foota]

I believe not all embedded systems have the c stdlib.

[jguegant]

Not the reason. Especially when the author includes headers like: #include <stdlib.h> #include <unistd.h> #include <sys/socket.h> #include <arpa/inet.h> #include <linux/ip.h> #include <linux/udp.h> #include <errno.h> #include <fcntl.h>