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Annotation of researchv10dc/man/manb/vwrite.2v, revision 1.1

1.1     ! root        1: .TH VWRITE 2V deprecated
        !             2: .UC 4
        !             3: .SH NAME
        !             4: vwrite \- write (virtually) to file
        !             5: .SH SYNOPSIS
        !             6: .nf
        !             7: .B vwrite(filedes, buffer, nbytes)
        !             8: .B char *buffer;
        !             9: .fi
        !            10: .SH DESCRIPTION
        !            11: .B N.B.:
        !            12: This call is likely to be replaced by more general virtual memory facilities
        !            13: in the near future.
        !            14: .PP
        !            15: The
        !            16: .I vwrite
        !            17: system call is used in conjunction with
        !            18: .I vread
        !            19: to perform efficient updating of large files.
        !            20: After a call to
        !            21: .I vread
        !            22: and updating of the data in the buffer which was given to
        !            23: .I vread,
        !            24: a
        !            25: .I vwrite
        !            26: of the same buffer to the same
        !            27: .I filedes
        !            28: at the same offset in the file
        !            29: will cause data which has been modified since it was
        !            30: .I vread
        !            31: from (or
        !            32: .I vwritten
        !            33: to) the file to be returned to the file.
        !            34: .SH SEE ALSO
        !            35: vread(2)
        !            36: .SH DIAGNOSTICS
        !            37: Returns \-1 on error: bad descriptor, buffer address, count or alignment
        !            38: as well as on physical I/O errors.
        !            39: .SH BUGS
        !            40: The result of
        !            41: .I vwrite
        !            42: is defined only when no other
        !            43: .I vread's
        !            44: have occurred on
        !            45: .I buffer
        !            46: since the one matching the
        !            47: .I vwrite.
        !            48: .PP
        !            49: This call is peculiar to this version of UNIX.
        !            50: It will be superseded by more general
        !            51: virtual memory facilities in future versions of the system.

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