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what’s in a process?
PID
process: process #129 reporting for duty!
USER and GROUP
from offscreen: who are you running as?
process: julia!
ENVIRONMENT VARIABLES
like PATH! you can set them with
$ env A=val./program
SIGNAL HANDLERS
process 1: I ignore SIGTERM!
process 2: I shut down safely!
WORKING DIRECTORY
Relative paths (./blah) are relative to the working directory! chdir changes it.
PARENT PID
PID 129 -> PID 147 -> PID 1 (init) is everyone’s ancestor
COMMAND LINE ARGUMENTS
see them in /proc/PID/cmdline
OPEN FILES
very open file has an offset.
process: I’ve read 8000 bytes of that one
MEMORY
heap! stack! shared libraries! the program’s binary! mmaped files!
THREADS
sometimes one
sometimes LOTS
CAPABILITIES
process 1: I have CAP_PTRACE
process 2: well I have CAP_SYS_ADMIN
NAMESPACES
process: I’m in the host network namespace
container process: I have my own namespace!
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