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Annotation of researchv10dc/dist/man/v3/man2/dup.2, revision 1.1.1.1

1.1       root        1: .pa 1
                      2: .he 'DUP (II)'1/15/73'DUP (II)'
                      3: .ti 0
                      4: NAME           dup -- duplicate an open file descriptor
                      5: .sp
                      6: .ti 0
                      7: SYNOPSIS       (file descriptor in r0)
                      8: .br
                      9: sys dup        / dup = 41.; not in assembler
                     10: .br
                     11: (file descriptor in r0)
                     12: .sp
                     13: .ti 0
                     14: DESCRIPTION    Given
                     15: a file descriptor returned from
                     16: an open or creat call,
                     17: dup___
                     18: will allocate another file descriptor
                     19: synonymous
                     20: with
                     21: the original.
                     22: The new file descriptor is returned in r0.
                     23: .sp
                     24: Dup___
                     25: is used more to manipulate the value
                     26: of file descriptors
                     27: than to genuinely
                     28: duplicate a file descriptor.
                     29: Since the algorithm to allocate
                     30: file descriptors
                     31: is known to use the
                     32: lowest available
                     33: value between 0 and 9,
                     34: combinations of dup___
                     35: and close_____ can be
                     36: used to
                     37: manipulate file descriptors
                     38: in a general way.
                     39: This is handy for
                     40: manipulating standard input and/or
                     41: standard output.
                     42: .sp
                     43: .ti 0
                     44: SEE ALSO       creat(II), open(II), close(II)
                     45: .sp
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                     47: DIAGNOSTICS    The
                     48: error bit (c-bit)
                     49: is set if:
                     50: the given file descriptor is invalid;
                     51: there are already 10 open files.
                     52: .sp
                     53: .ti 0
                     54: BUGS           --

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