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Can a process ‘foo’ write to file descriptor 3, for example, in such a way that inside a bash shell one can do
foo 1>f1 2>f2 3>f3
and if so how would you write it (in C)?
The shell opens the file descriptors for your program before executing it. Simply use them like you would any other file descriptor, e.g.
write(3, buf, len);etc. You may want to do error checking to make sure they were actually opened (attempting todupthem then closing the duplicate would be one easy check).