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In some cases it is required to change application behaviour depending on iPhone or iPod Touch device version.

#import <sys/utsname.h>;
...
struct utsname u;
uname(&u);

After calling uname() function, u.machine will be “iPod1,1″, “iPod2,1″ for iPod Touch and “iPhone1,1″, “iPhone1,2″, “iPhone2,1″ for iPhone (or similar depending on current device).

Source:

• Mac OS X Manual Page For uname(3)
• Detect the specific iPhone/iPod touch model – Stack Overflow
• Get the type of the iPhone programmatically? – iPhone Dev SDK Forum