Troubleshooting - HP Rp3440-4 - 9000 - 0 MB RAM Programmer's Manual

Troubleshooting

The first step to take is to avoid many problems by using good
programming and debugging techniques. Your programs should check for
a returned error after each system call and print any that occur. For
example, the following program lines print an error message for read:
cc=read(sock,buffer,1000);
if (cc<0) {
perror ("reading message")
exit(1)
}
Refer to the perror(3C) man page for more information . Also refer to
the appropriate man page for information about errors returned by the
BSD Sockets system calls such as read.
You can also compile your program with the debugging option (-g) and
use one of the debuggers (e.g. cdb or xdb) to help debug the programs.
It is possible that you could assign a reserved port address and cause a
service to fail. For example, if the nftdaemon is not running, and you
assign its port, when you try to start the nftdaemon, it fails. See the
/etc/services file for the list of reserved ports.
Chapter 8
Programming Hints
Troubleshooting
167