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dup()                  COHERENT System Call                 dup()




Duplicate a file descriptor

iinntt dduupp(_f_d) iinntt _f_d;

dup duplicates  the existing file descriptor  fd, and returns the
new descriptor.  The returned value is the smallest file descrip-
tor that is not already in use by the calling process.

***** See Also *****

COHERENT system calls, dup2(), fopen(), fdopen(), STDIO

***** Diagnostics *****

dup returns a number less than zero when an error occurs, such as
a bad file descriptor or no file descriptor available.








































COHERENT Lexicon                                           Page 1

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