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- Everything in the u area could be saved.
-
- What we actually save:
- open file descriptor positions
- signal handlers
- (uid)
-
- Easy to restore from the outside:
- open file descriptor state (fcntl, ioctl, etc.)
- cwd
- umask
- args, environment (don't know about environ)
-
- security:
- pid
- ppid
- pgid
- uid, euid
- gid, egid
- access groups
- root dir
-
- too system dependent:
- shm
- sem
- signal stack
- signal mask
- trace flag
- ctty
- interval timers
- resource limits
-
- simply can't be restored:
- rusage
- profil
-