Diagnosing X Window System and Motif problems

This topic describes environment variable XWTRACE that might be useful when diagnosing X Window System and Motif problems. The environment variable, XWTRACE, controls the generation of traces of the socket level communication between Xlib and the X Window System Server.

The following subtopics are included:
  • XWTRACE undefined or zero — No trace generated.
  • XWTRACE=1 — Error messages.
  • XWTRACE>=2 — API function tracing for TRANS functions.
Another environment variable, XWTRACELC, causes a trace of various locale-sensitive routines. If XWTRACELC is defined, a routine flow trace is generated. If XWTRACELC=2, more detailed information is provided.
Guideline: There are no special post-install activities for GDDMXD in z/OS® Communications Server. GDDM APAR (PN77391) eliminated these activities for TC/IP Version 3 Release 1. However, if you have an old GDDMXD load library (tcpip.v3r1.SEZALNKG) in your LNKLSTxx member in SYSx.PARMLIB, you need to remove that library from the MVS™ link list, because it is no longer needed.

Following are some examples of X Window System traces.

Parent topic: Diagnosing z/OS Communications Server components