/* * 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 { int dummy;/* DEBUG so old-style routines can look at this struct */ char p_stat; char p_flag; char p_pri; /* priority, negative is high */ char p_sig; /* signal number sent to this process */ char p_uid; /* user id, used to direct tty signals */ char p_time; /* resident time for scheduling */ char p_cpu; /* cpu usage for scheduling */ char p_nice; /* nice for cpu usage */ 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 */ char *p_textp; /* pointer to text structure */ int p_clktim; /* time to alarm clock signal */ }; #ifdef NPROC struct proc proc[NPROC]; #endif NPROC /* p_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 */ /* p_flag codes */ #define SLOAD 0001 /* in core */ #define SSYS 0002 /* scheduling process */ #define SLOCK 0004 /* process cannot be swapped */ #define SSWAP 0010 /* process is being swapped out */ #define STRC 0020 /* process is being traced */ #define SWTED 0040 /* another tracing flag */ #define SNOSIG 0100 /* rand:bobg--process isn't to get quit or interrupts from controlling tty */