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+.TH OPEN 2
+.CT 2 file_io
+.SH NAME
+open \(mi open for reading or writing
+.SH SYNOPSIS
+.nf
+.B int open(name, rwmode)
+.B char *name;
+.fi
+.SH DESCRIPTION
+.I Open
+opens the file
+.I name
+for reading
+(if
+.I rwmode
+is 0),
+writing (if
+.I rwmode
+is 1)
+or for both reading and writing
+(if
+.I rwmode
+is 2)
+and returns an associated file descriptor.
+.I Name
+is a null-terminated string representing
+a path name.
+.PP
+The file pointer is set to 0.
+.PP
+It is not possible to open for writing a file with set-userid
+or set-groupid permission; see
+.IR stat (2).
+.SH "SEE ALSO"
+.IR close (2),
+.IR creat (2), 
+.IR dup (2), 
+.IR read (2), 
+.IR write (2)
+.SH DIAGNOSTICS
+.BR EACCES ,
+.BR EBUSY ,
+.BR ECONC ,
+.BR EFAULT ,
+.BR EINTR ,
+.BR EIO ,
+.BR EISDIR ,
+.BR ELAB ,
+.BR ELOOP ,
+.BR EMFILE ,
+.BR ENFILE ,
+.BR ENOENT ,
+.BR ENOTDIR ,
+.BR EROFS ,
+.BR ETXTBSY
+.SH BUGS
+It should be possible to open files for writing with exclusive use,
+and to call
+.I open
+without the necessity of waiting for carrier on communication lines.