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Everything about Execute Channel Program

Operating System low level I/O API

In IBM mainframe operating systems, Execute Channel Program (EXCP) is a macro generating a system call, implemented as a Supervisor Call instruction, for low-level device access, where the programmer is responsible for providing a channel program—a list of device-specific commands (CCWs)—to be executed by I/O channels, control units and devices. EXCP for OS/360 and successors is more specifically described in the OS System Programmer's Guide.; EXCP for DOS/360 and successors is more specifically described in DOS Supervisor and I/O Macros. This article mostly reflects OS/360 through z/OS; some details are different for TOS/360 and DOS/360 through z/VSE. Wikipedia →

🧭 Start here: a 6-step reading path

  1. Read the overview: Execute Channel ProgramA 5-minute orientation
  2. Skim a recent paper: Creating and Developing a High-Throughput Covert Channel via Program ExecutionInfluential work since 2022
  3. Pick up a classic book: The Boy in the Striped PyjamasThe most-reprinted book on the subject
  4. Go sideways: Execute Channel Program in Real StorageA closely related topic
  5. Go sideways: Access methodA closely related topic

📖 Definitions

No dictionary entry for this exact phrase.

🗂️ The subject at a glance

  1. Specifying datasets
  2. Specifying I/O operations
  3. Appendages
  4. Dataset integrity
  5. Legacy datasets only
  6. Simplified operations on direct access datasets
  7. Telecommunications device access
  8. Relationship to supervisor
  9. Channel programs

🏆 Landmark papers (most cited)

🆕 Influential since 2022

📚 Books worth reading

Ranked by number of editions on Open Library, a rough measure of how lasting a book is.

🔗 Related topics