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Annotation of lucent/sys/man/3/dup, revision 1.1.1.1

1.1       root        1: .TH DUP 3 
                      2: .SH NAME
                      3: dup \- dups of open files
                      4: .SH SYNOPSIS
                      5: .nf
                      6: .B bind #d /fd
                      7: 
                      8: .B /fd/0
                      9: .B /fd/1
                     10: \&...
                     11: .fi
                     12: .SH DESCRIPTION
                     13: The
                     14: .I dup
                     15: device serves a one-level directory containing files whose
                     16: names are decimal numbers.
                     17: A file of name
                     18: .I n
                     19: corresponds to open file descriptor
                     20: .I n
                     21: in the current process.
                     22: .PP
                     23: An
                     24: .IR open (2)
                     25: of file
                     26: .I n
                     27: results in a file descriptor identical to
                     28: what would be returned from a system call
                     29: .IB dup ( n ", -1)."
                     30: Note that the result is no longer a file in the
                     31: .I dup
                     32: device.
                     33: .PP
                     34: The
                     35: .I stat
                     36: operation returns information about the device file, not the open file it points to.
                     37: A stat of
                     38: .BI #d/ n
                     39: will contain
                     40: .I n
                     41: for the name, 0 for the length, and 0400, 0200, or 0600
                     42: for the mode, depending on whether the dup target is open
                     43: for reading, writing, or both.
                     44: .SH SEE ALSO
                     45: .IR dup (2)
                     46: .SH SOURCE
                     47: .B /sys/src/9/port/devdup.c

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