R devel - Dec 2000 - showConnections() does not show closed (or non-opened) connections though help says so (PR#784)

help on showConnections explains parameter
all logical: if true all connections, including closed ones and the standard
ones are displayed. If false only open user-created connections are included.

but
> # create a file 
> cat("TITLE extra line", "2 3 5 7", "",
"11 13 17", file="ex.data",
+     sep="\n")
> showConnections(all=TRUE)
  class    description mode text   isopen   can read can write
0 "stdin"  "terminal"  "r"  "text"
"opened" "yes"    "no"
1 "stdout" "terminal"  "w"  "text"
"opened" "no"     "yes"
2 "stderr" "terminal"  "w"  "text"
"opened" "no"     "yes"   
> 
> con <- file("ex.data")
> showConnections(all=TRUE)
  class    description mode text   isopen   can read can write
0 "stdin"  "terminal"  "r"  "text"
"opened" "yes"    "no"
1 "stdout" "terminal"  "w"  "text"
"opened" "no"     "yes"
2 "stderr" "terminal"  "w"  "text"
"opened" "no"     "yes"   
> # here the connection (existing? but not-opened) is not listend 
> 
> open(con)
> showConnections(all=TRUE)
  class     description mode text   isopen   can read can write
0 "stdin"   "terminal"  "r"  "text"
"opened" "yes"    "no"
1 "stdout"  "terminal"  "w"  "text"
"opened" "no"     "yes"
2 "stderr"  "terminal"  "w"  "text"
"opened" "no"     "yes"
3 "ex.data" "file"      "r"  "text"
"opened" "yes"    "no"    
> 
> close(con)
> showConnections(all=TRUE)
  class    description mode text   isopen   can read can write
0 "stdin"  "terminal"  "r"  "text"
"opened" "yes"    "no"
1 "stdout" "terminal"  "w"  "text"
"opened" "no"     "yes"
2 "stderr" "terminal"  "w"  "text"
"opened" "no"     "yes"   
> 
> readLines("ex.data", n=-1)
[1] "TITLE extra line" "2 3 5 7"          ""      
"11 13 17"        
> showConnections(all=TRUE)
  class    description mode text   isopen   can read can write
0 "stdin"  "terminal"  "r"  "text"
"opened" "yes"    "no"
1 "stdout" "terminal"  "w"  "text"
"opened" "no"     "yes"
2 "stderr" "terminal"  "w"  "text"
"opened" "no"     "yes"   
> # here we don't know whether showConnections() does not show a
connection created and opened by readLine()
> # or whether readLines() did also close the connection

Regards


Jens Oehlschlägel


--please do not edit the information below--

Version:
 platform = i386-pc-mingw32
 arch = x86
 os = Win32
 system = x86, Win32
 status = 
 major = 1
 minor = 2.0
 year = 2000
 month = 12
 day = 15
 language = R

Windows NT 4.0 (build 1381) Service Pack 6

Search Path:
 .GlobalEnv, package:ctest, Autoloads, package:base

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