Linux中进程结构描述符

include/linux/sched.h
384   struct task_struct {
385     volatile long state;
386     struct thread_info *thread_info;
387     atomic_t usage;
388     unsigned long flags; 
389     unsigned long ptrace;
390
391     int lock_depth;
392
393     int prio, static_prio;
394     struct list_head run_list;
395     prio_array_t *array;
396
397     unsigned long sleep_avg;
398     long interactive_credit;
399     unsigned long long timestamp;
400     int activated;
401
302     unsigned long policy;
403     cpumask_t cpus_allowed;
404     unsigned int time_slice, first_time_slice;
405
406     struct list_head tasks;
407     struct list_head ptrace_children;
408     struct list_head ptrace_list;
409
410     struct mm_struct *mm, *active_mm;
...
413     struct linux_binfmt *binfmt;
414     int exit_code, exit_signal;
415     int pdeath_signal;
...
419     pid_t pid;
420     pid_t tgid;
...
426     struct task_struct *real_parent;
427     struct task_struct *parent;
428     struct list_head children;
429     struct list_head sibling;
430     struct task_struct *group_leader;
...
433     struct pid_link pids[PIDTYPE_MAX];
434
435     wait_queue_head_t wait_chldexit;
436     struct completion *vfork_done;
437     int __user *set_child_tid;
438     int __user *clear_child_tid;
439
440     unsigned long rt_priority;
441     unsigned long it_real_value, it_prof_value, it_virt_value;
442     unsigned long it_real_incr, it_prof_incr, it_virt_incr;
443     struct timer_list real_timer;
444     unsigned long utime, stime, cutime, cstime;
445     unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
446     u64 start_time;
...
450     uid_t uid,euid,suid,fsuid;
451     gid_t gid,egid,sgid,fsgid;
452     struct group_info *group_info;
453     kernel_cap_t cap_effective, cap_inheritable, cap_permitted;
454     int keep_capabilities:1;
455     struct user_struct *user;
...
457     struct rlimit rlim[RLIM_NLIMITS];
458     unsigned short used_math;
459     char comm[16];
...
461     int link_count, total_link_count;
...
467     struct fs_struct *fs;
...
469     struct files_struct *files;
...
509     unsigned long ptrace_message;
510     siginfo_t *last_siginfo;
...
516   };

The following categories describe some of the types of things a process descriptor must keep track of during a process' lifespan:　进程运行中必须保存的一些信息类别

• Process attributes进程属性

• Process relationships进程间关系

• Process memory space进程内存空间

• File management文件管理

• Signal management信号管理

• Process credentials进程信任状态

• Resource limits资源限制

• Scheduling related fields调度相关的字段

current宏指向当前进程数据结构描述符！可以自己写一个小程序，将这些信息都打出来！