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Full Discussion: Xlib: XKeysymToKeycode hangs
Top Forums UNIX for Advanced & Expert Users Xlib: XKeysymToKeycode hangs Post 302748663 by N7DR on Wednesday 26th of December 2012 01:47:18 PM
Old 12-26-2012
Quote:
Ok - this is C, you assert the _display_p variable is valid. You know this how?

Please post your code.
The pertinent class is called keyboard_queue.

In the class definition, there is:

Code:
  Display*                    _display_p;   // the X display pointer

The constructor provides a value for this in the initializer list:

Code:
  _display_p(XOpenDisplay(NULL)),

The value is tested inside the construstor, just in case the call to XOpenDisplay() failed:

Code:
 if (!_display_p)
  { cerr << "Fatal error: unable to open display" << endl;
    exit (-1);
  }

Then, inside a member function called push_key_press, occurs the line that hangs (I have temporarily, while testing, replaced the call to the variable ks of type KeySym with an explicit value, XK_g):

Code:
   const KeyCode kc = XKeysymToKeycode(_display_p, XK_g);

Following the initialisation of _display_p in the class constructor, the only place that _display_p is used is in direct calls to X functions: I never access it myself.

If I remove the line that hangs, and code that depends on it, then everything else -- in particular, all the calls to X functions, both prior to and subsequent to the offending line -- works as expected.
 

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IRSEND(1)							   User Commands							 IRSEND(1)

NAME
irsend - basic LIRC program to send infra-red commands SYNOPSIS
irsend [options] DIRECTIVE REMOTE CODE [CODE...] DESCRIPTION
Asks the lircd daemon to send one or more CIR (Consumer Infra-Red) commands. This is intended for remote control of electronic devices such as TV boxes, HiFi sets, etc. DIRECTIVE can be: SEND_ONCE - send CODE [CODE ...] once SEND_START - start repeating CODE SEND_STOP - stop repeating CODE LIST - list configured remote items SET_TRANSMITTERS - set transmitters NUM [NUM ...] SIMULATE - simulate IR event REMOTE is the name of a remote, as described in the lircd configuration file. CODE is the name of a remote control key of REMOTE, as it appears in the lircd configuration file. NUM is the transmitter number of the hardware device. For the LIST DIRECTIVE, REMOTE and/or CODE can be empty: LIST "" "" - list all configured remote names LIST REMOTE "" - list all codes of REMOTE LIST REMOTE CODE - list only CODE of REMOTE The SIMULATE command only works if it has been explicitly enabled in lircd. -h --help display usage summary -v --version display version -d --device use given lircd socket [/var/run/lirc/lircd] -a --address=host[:port] connect to lircd at this address -# --count=n send command n times EXAMPLES
irsend LIST DenonTuner "" irsend SEND_ONCE DenonTuner PROG-SCAN irsend SEND_ONCE OnkyoAmpli VOL-UP VOL-UP VOL-UP VOL-UP irsend SEND_START OnkyoAmpli VOL-DOWN ; sleep 3 irsend SEND_STOP OnkyoAmpli VOL-DOWN irsend SET_TRANSMITTERS 1 irsend SET_TRANSMITTERS 1 3 4 irsend SIMULATE "0000000000000476 00 OK TECHNISAT_ST3004S" FILES
/etc/lirc/lircd.conf Default lircd configuration file. It should contain all the remotes, their infra-red codes and the corresponding timing and wave- form details. DIAGNOSTICS
If lircd is not running (or /var/run/lirc/lircd lacks write permissions) irsend aborts with the following diagnostics: "irsend: could not connect to socket" "irsend: Connection refused" (or "Permission denied"). SEE ALSO
The documentation for lirc is maintained as html pages. They are located under html/ in the documentation directory. lircd(8), mode2(1), smode2(1), xmode2(1), irrecord(1), irw(1), http://www.lirc.org. irsend 0.9.0-pre1 October 2010 IRSEND(1)
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