tag

#process-management

3 posts

FreeDOSDeep Dive October 3, 2026 7 min read

DOS INT 21h EXEC: Launch a Child and Collect Its Real Exit Result

Build a reliable DOS child-process call around EXEC, its parameter block, inherited environment and handles, memory requirements, and one-time return status.

#freedos#dos-api#process-management

FreeDOSDeep Dive October 3, 2026 8 min read

The DOS Program Segment Prefix: Process State, Startup Data, and Safe Boundaries

Read the DOS PSP as a process ABI: map parent, environment, handle, FCB, and command-tail fields while avoiding unsafe assumptions about private bytes.

#freedos#dos-api#psp

FreeBSDDeep Dive October 3, 2026 8 min read

FreeBSD Process Descriptors: Track Child Lifecycles Without PID Races

Use FreeBSD process descriptors to signal, wait for, and monitor child processes by file descriptor, with explicit close and Capsicum semantics.

#freebsd#procdesc#pdfork