/* * One structure allocated per active process. It contains all data needed * about the process while the process may be swapped out. * Other per process data (user.h) is swapped with the process. */ struct proc { char p_stat; char p_flag; char p_pri; /* priority, negative is high */ char p_time; /* resident time for scheduling */ char p_cpu; /* cpu usage for scheduling */ char p_nice; /* nice for cpu usage */ int p_sig; /* signals pending to this process */ int p_uid; /* user id, used to direct tty signals */ int p_pgrp; /* name of process group leader */ int p_pid; /* unique process id */ int p_ppid; /* process id of parent */ int p_addr; /* address of swappable image */ int p_size; /* size of swappable image (*64 bytes) */ int p_wchan; /* event process is awaiting */ int *p_textp; /* pointer to text structure */ int *p_link; /* linked list of running processes */ int p_clktim; /* time to alarm clock signal */ }; extern struct proc proc[]; /* stat codes */ #define SSLEEP 1 /* awaiting an event */ #define SWAIT 2 /* (abandoned state) */ #define SRUN 3 /* running */ #define SIDL 4 /* intermediate state in process creation */ #define SZOMB 5 /* intermediate state in process termination */ #define SSTOP 6 /* process being traced */ /* flag codes */ #define SLOAD 01 /* in core */ #define SSYS 02 /* scheduling process */ #define SLOCK 04 /* process cannot be swapped */ #define SSWAP 010 /* process is being swapped out */ #define STRC 020 /* process is being traced */ #define SWTED 040 /* another tracing flag */ /* * Structure used to access saved times and status * of a dead processs, by the parent. * Overlays the proc structure. */ struct xproc { char p_stat; char p_flag; char p_pri; /* priority, negative is high */ char p_time; /* resident time for scheduling */ char p_cpu; /* cpu usage for scheduling */ char p_nice; /* nice for cpu usage */ int p_sig; /* signals pending to this process */ int p_uid; /* user id, used to direct tty signals */ int p_pgrp; /* name of process group leader */ int p_pid; /* unique process id */ int p_ppid; /* process id of parent */ int xp_xstat; /* Exit status for wait */ long xp_utime; /* user time, this proc */ long xp_stime; /* system time, this proc */ int p_clktim; /* time to alarm clock signal */ };