For those of you on the Mac that doesn't have strace but does have dtrace, here are some preinstalled dtrace scripts you have at your fingertips:

dtruss - similar to strace opensnoop - all files nettop - all network access iosnoop/iotop - all io execsnoop - all new processes errinfo - all system calls resulting in errors

Not exactly the same info but I think much more powerful as it is system wide and you call always filter out what you don't need to know, or write your own scripts!