The
Linux kernel data structure that represents a
process.
struct task_struct {
struct task_struct {
/* these are hardcoded - don't touch */
volatile long state; /* -1 unrunnable, 0
runnable, >0 stopped */
long counter;
long priority;
unsigned long signal;
unsigned long blocked; /* bitmap of masked signals
*/
unsigned long flags; /* per process flags,
defined below */
int errno;
long debugreg
8; /* Hardware debugging registers
*/
struct exec_domain *exec_domain;
/* various fields */
struct linux_binfmt *binfmt;
struct task_struct *next_task, *prev_task;
struct task_struct *next_run, *prev_run;
unsigned long saved_kernel_stack;
unsigned long kernel_stack_page;
int exit_code, exit_signal;
/* ??? */
unsigned long personality;
int dumpable:1;
int did_exec:1;
/* shouldn't this be pid_t? */
int pid;
int pgrp;
int tty_old_pgrp;
int session;
/* boolean value for session group leader */
int leader;
int groups
NGROUPS;
/*
* pointers to (original) parent process, youngest
child, younger sibling,
* older sibling, respectively. (p->father can be
replaced with
* p->p_pptr->pid)
*/
struct task_struct *p_opptr, *p_pptr, *p_cptr,
*p_ysptr, *p_osptr;
struct wait_queue *wait_chldexit;
/* for wait4() */
unsigned short uid,euid,suid,fsuid;
unsigned short gid,egid,sgid,fsgid;
unsigned long timeout, policy, rt_priority;
unsigned long it_real_value, it_prof_value,
it_virt_value;
unsigned long it_real_incr, it_prof_incr,
it_virt_incr;
struct timer_list real_timer;
long utime, stime, cutime, cstime, start_time;
/* mm fault and swap info: this can arguably be seen as
either mm-specific or thread-specific */
unsigned long min_flt, maj_flt, nswap, cmin_flt,
cmaj_flt, cnswap;
int swappable:1;
unsigned long swap_address;
unsigned long old_maj_flt; /* old value of
maj_flt */
unsigned long dec_flt; /* page fault count
of the last time */
unsigned long swap_cnt; /* number of pages
to swap on next pass */
/* limits */
struct rlimit rlim
RLIM_NLIMITS;
unsigned short used_math;
char comm
16;
/* file system info */
int link_count;
struct tty_struct *tty; /* NULL if no tty */
/* ipc stuff */
struct sem_undo *semundo;
struct sem_queue *semsleeping;
/* ldt for this task - used by Wine. If NULL, default_ldt
is used */
struct desc_struct *ldt;
/* tss for this task */
struct thread_struct tss;
/* filesystem information */
struct fs_struct *fs;
/* open file information */
struct files_struct *files;
/* memory management info */
struct mm_struct *mm;
/* signal handlers */
struct signal_struct *sig;
#ifdef __SMP__
int processor;
int last_processor;
int lock_depth; /* Lock depth. We can
context switch in and out of holding a syscall kernel
lock... */
#endif
};