Return to dup.2 CVS log

Up to [Research Unix] / researchv10dc / dist / man / v4 / man2

Annotation of researchv10dc/dist/man/v4/man2/dup.2, revision 1.1

1.1     ! root        1: .th DUP II 8/5/73
        !             2: .sh NAME
        !             3: dup \*- duplicate an open file descriptor
        !             4: .sh SYNOPSIS
        !             5: (dup = 41.; not in assembler)
        !             6: .br
        !             7: (file descriptor in r0)
        !             8: .br
        !             9: .ft B
        !            10: sys dup
        !            11: .s3
        !            12: dup(fildes)
        !            13: .br
        !            14: int fildes;
        !            15: .ft R
        !            16: .sh DESCRIPTION
        !            17: Given
        !            18: a file descriptor returned from
        !            19: an
        !            20: .it open,
        !            21: .it pipe,
        !            22: or
        !            23: .it creat
        !            24: call,
        !            25: .it dup
        !            26: will allocate another file descriptor
        !            27: synonymous
        !            28: with
        !            29: the original.
        !            30: The new file descriptor is returned in r0.
        !            31: .s3
        !            32: .it Dup
        !            33: is used more to reassign the value
        !            34: of file descriptors
        !            35: than to genuinely
        !            36: duplicate a file descriptor.
        !            37: Since the algorithm to allocate
        !            38: file descriptors
        !            39: returns the
        !            40: lowest available
        !            41: value between 0 and 9,
        !            42: combinations of
        !            43: .it dup
        !            44: and
        !            45: .it close
        !            46: can be
        !            47: used to
        !            48: manipulate file descriptors
        !            49: in a general way.
        !            50: This is handy for
        !            51: manipulating standard input and/or
        !            52: standard output.
        !            53: .sh "SEE ALSO"
        !            54: creat(II), open(II), close(II), pipe(II)
        !            55: .sh DIAGNOSTICS
        !            56: The
        !            57: error bit (c-bit)
        !            58: is set if:
        !            59: the given file descriptor is invalid;
        !            60: there are already 10 open files.
        !            61: From C, a \*-1 returned value indicates an error.

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.