Request for C API to change process name

Number:rdar://32249963 Date Originated:2017-05-17
Status:Duplicate/15629392 Resolved:2017-05-25
Product:macOS + SDK Product Version:Mac OS X 10.12.5 (16F73)
Classification:Suggestion Reproducible:N/A
Something not on this list

Other POSIXes have a C/kernel API to change the current process name, to differentiate it from the name by which it was launched (either p_comm or p_name in the kernel proc_t). This is useful for several situations:

- Scripting-language based programs that want to change their ps name from e.g. `python' to `server name'.
- Programs that use fork() to create a worker pool of processes, with a master parent process controlling the children, to differentiate the different processes.
- Add additional status information to the `ps` line.

Other BSDs provide this functionality via setproctitle(), and Linux provides it via prctl(PR_SET_NAME) Setting the main thread's title via pthread_setname_np() does not alter the process name, as it does on Linux.

This is a request for an API similar to setproctitle() on macOS.

Steps to Reproduce:
Want to change the process name (in the output of `ps` and Activity after it is already running.

Expected Results:
An API like setproctitle() to change the process title.

Observed Results:
There is no API to change the process title after a process is running.

Mac OS X 10.12.5 (16F73)


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