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Top Forums Shell Programming and Scripting Problems with I/O redirection via exec Post 302950154 by Corona688 on Tuesday 21st of July 2015 03:14:43 PM
Old 07-21-2015
& doesn't mean "unconditionally dissociated from the terminal" -- anything but, really. Once it's in the background, attempting to do I/O on the std channels will suspend it. This is expected behavior.
 

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Tk_InitConsoleChannels(3)				       Tk Library Procedures					 Tk_InitConsoleChannels(3)

__________________________________________________________________________________________________________________________________________________

NAME
Tk_InitConsoleChannels - Install the console channels as standard channels SYNOPSIS
#include <tk.h> Tk_InitConsoleChannels(interp) ARGUMENTS
Tcl_Interp *interp (in) Interpreter in which the console channels are created. _________________________________________________________________ DESCRIPTION
Tk_InitConsoleChannels is invoked to create a set of console channels and install them as the standard channels. All I/O on these channels will be discarded until Tk_CreateConsoleWindow is called to attach the console to a text widget. This function is for use by shell applications based on Tk, like wish, on platforms which have no standard channels in graphical mode, like Win32. The interp argument is the interpreter in which to create and install the console channels. NOTE: If this function is used it has to be called before the first call to Tcl_RegisterChannel, directly, or indirectly through other channel functions. Because otherwise the standard channels will be already initialized to the system defaults, which will be nonsensical for the case Tk_InitConsoleChannels is for. SEE ALSO
console(n) KEYWORDS
standard channels, console Tk 8.5 Tk_InitConsoleChannels(3)
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