include/linux/sched.h

   1 #ifndef _LINUX_SCHED_H
   2 #define _LINUX_SCHED_H
   3
   4 #include <asm/param.h>  /* for HZ */
   5
   6 extern unsigned long event;
   7
   8 #include <linux/binfmts.h>
   9 #include <linux/personality.h>
  10 #include <linux/threads.h>
  11 #include <linux/kernel.h>
  12 #include <linux/types.h>
  13 #include <linux/times.h>
  14 #include <linux/timex.h>
  15
  16 #include <asm/system.h>
  17 #include <asm/semaphore.h>
  18 #include <asm/page.h>
  19 #include <asm/ptrace.h>
  20
  21 #include <linux/smp.h>
  22 #include <linux/tty.h>
  23 #include <linux/sem.h>
  24 #include <linux/signal.h>
  25 #include <linux/securebits.h>
  26
  27 /*
  28  * cloning flags:
  29  */
  30 #define CSIGNAL         0x000000ff      /* signal mask to be sent at exit */
  31 #define CLONE_VM        0x00000100      /* set if VM shared between processes */
  32 #define CLONE_FS        0x00000200      /* set if fs info shared between processes */
  33 #define CLONE_FILES     0x00000400      /* set if open files shared between processes */
  34 #define CLONE_SIGHAND   0x00000800      /* set if signal handlers shared */
  35 #define CLONE_PID       0x00001000      /* set if pid shared */
  36 #define CLONE_PTRACE    0x00002000      /* set if we want to let tracing continue on the child too */
  37 #define CLONE_VFORK     0x00004000      /* set if the parent wants the child to wake it up on mm_release */
  38 #define CLONE_PARENT    0x00008000      /* set if we want to have the same parent as the cloner */
  39
  40 /*
  41  * These are the constant used to fake the fixed-point load-average
  42  * counting. Some notes:
  43  *  - 11 bit fractions expand to 22 bits by the multiplies: this gives
  44  *    a load-average precision of 10 bits integer + 11 bits fractional
  45  *  - if you want to count load-averages more often, you need more
  46  *    precision, or rounding will get you. With 2-second counting freq,
  47  *    the EXP_n values would be 1981, 2034 and 2043 if still using only
  48  *    11 bit fractions.
  49  */
  50 extern unsigned long avenrun[];         /* Load averages */
  51
  52 #define FSHIFT          11              /* nr of bits of precision */
  53 #define FIXED_1         (1<<FSHIFT)     /* 1.0 as fixed-point */
  54 #define LOAD_FREQ       (5*HZ)          /* 5 sec intervals */
  55 #define EXP_1           1884            /* 1/exp(5sec/1min) as fixed-point */
  56 #define EXP_5           2014            /* 1/exp(5sec/5min) */
  57 #define EXP_15          2037            /* 1/exp(5sec/15min) */
  58
  59 #define CALC_LOAD(load,exp,n) \
  60         load *= exp; \
  61         load += n*(FIXED_1-exp); \
  62         load >>= FSHIFT;
  63
  64 #define CT_TO_SECS(x)   ((x) / HZ)
  65 #define CT_TO_USECS(x)  (((x) % HZ) * 1000000/HZ)
  66
  67 extern int nr_running, nr_threads;
  68 extern int last_pid;
  69
  70 #include <linux/fs.h>
  71 #include <linux/time.h>
  72 #include <linux/param.h>
  73 #include <linux/resource.h>
  74 #include <linux/timer.h>
  75
  76 #include <asm/processor.h>
  77
  78 #define TASK_RUNNING            0
  79 #define TASK_INTERRUPTIBLE      1
  80 #define TASK_UNINTERRUPTIBLE    2
  81 #define TASK_ZOMBIE             4
  82 #define TASK_STOPPED            8
  83 #define TASK_SWAPPING           16
  84 #define TASK_EXCLUSIVE          32
  85
  86 #define __set_task_state(tsk, state_value)              \
  87         do { tsk->state = state_value; } while (0)
  88 #ifdef __SMP__
  89 #define set_task_state(tsk, state_value)                \
  90         set_mb(tsk->state, state_value)
  91 #else
  92 #define set_task_state(tsk, state_value)                \
  93         __set_task_state(tsk, state_value)
  94 #endif
  95
  96 #define __set_current_state(state_value)                        \
  97         do { current->state = state_value; } while (0)
  98 #ifdef __SMP__
  99 #define set_current_state(state_value)          \
 100         set_mb(current->state, state_value)
 101 #else
 102 #define set_current_state(state_value)          \
 103         __set_current_state(state_value)
 104 #endif
 105
 106 /*
 107  * Scheduling policies
 108  */
 109 #define SCHED_OTHER             0
 110 #define SCHED_FIFO              1
 111 #define SCHED_RR                2
 112
 113 /*
 114  * This is an additional bit set when we want to
 115  * yield the CPU for one re-schedule..
 116  */
 117 #define SCHED_YIELD             0x10
 118
 119 struct sched_param {
 120         int sched_priority;
 121 };
 122
 123 #ifndef NULL
 124 #define NULL ((void *) 0)
 125 #endif
 126
 127 #ifdef __KERNEL__
 128
 129 #include <linux/spinlock.h>
 130
 131 /*
 132  * This serializes "schedule()" and also protects
 133  * the run-queue from deletions/modifications (but
 134  * _adding_ to the beginning of the run-queue has
 135  * a separate lock).
 136  */
 137 extern rwlock_t tasklist_lock;
 138 extern spinlock_t runqueue_lock;
 139
 140 extern void sched_init(void);
 141 extern void init_idle(void);
 142 extern void show_state(void);
 143 extern void cpu_init (void);
 144 extern void trap_init(void);
 145
 146 #define MAX_SCHEDULE_TIMEOUT    LONG_MAX
 147 extern signed long FASTCALL(schedule_timeout(signed long timeout));
 148 asmlinkage void schedule(void);
 149
 150 /*
 151  * The default fd array needs to be at least BITS_PER_LONG,
 152  * as this is the granularity returned by copy_fdset().
 153  */
 154 #define NR_OPEN_DEFAULT BITS_PER_LONG
 155
 156 /*
 157  * Open file table structure
 158  */
 159 struct files_struct {
 160         atomic_t count;
 161         rwlock_t file_lock;
 162         int max_fds;
 163         int max_fdset;
 164         int next_fd;
 165         struct file ** fd;      /* current fd array */
 166         fd_set *close_on_exec;
 167         fd_set *open_fds;
 168         fd_set close_on_exec_init;
 169         fd_set open_fds_init;
 170         struct file * fd_array[NR_OPEN_DEFAULT];
 171 };
 172
 173 #define INIT_FILES { \
 174         ATOMIC_INIT(1), \
 175         RW_LOCK_UNLOCKED, \
 176         NR_OPEN_DEFAULT, \
 177         __FD_SETSIZE, \
 178         0, \
 179         &init_files.fd_array[0], \
 180         &init_files.close_on_exec_init, \
 181         &init_files.open_fds_init, \
 182         { { 0, } }, \
 183         { { 0, } }, \
 184         { NULL, } \
 185 }
 186
 187 struct fs_struct {
 188         atomic_t count;
 189         int umask;
 190         struct dentry * root, * pwd;
 191 };
 192
 193 #define INIT_FS { \
 194         ATOMIC_INIT(1), \
 195         0022, \
 196         NULL, NULL \
 197 }
 198
 199 /* Maximum number of active map areas.. This is a random (large) number */
 200 #define MAX_MAP_COUNT   (65536)
 201
 202 /* Number of map areas at which the AVL tree is activated. This is arbitrary. */
 203 #define AVL_MIN_MAP_COUNT       32
 204
 205 struct mm_struct {
 206         struct vm_area_struct * mmap;           /* list of VMAs */
 207         struct vm_area_struct * mmap_avl;       /* tree of VMAs */
 208         struct vm_area_struct * mmap_cache;     /* last find_vma result */
 209         pgd_t * pgd;
 210         atomic_t mm_users;                      /* How many users with user space? */
 211         atomic_t mm_count;                      /* How many references to "struct mm_struct" (users count as 1) */
 212         int map_count;                          /* number of VMAs */
 213         struct semaphore mmap_sem;
 214         spinlock_t page_table_lock;
 215         unsigned long context;
 216         unsigned long start_code, end_code, start_data, end_data;
 217         unsigned long start_brk, brk, start_stack;
 218         unsigned long arg_start, arg_end, env_start, env_end;
 219         unsigned long rss, total_vm, locked_vm;
 220         unsigned long def_flags;
 221         unsigned long cpu_vm_mask;
 222         unsigned long swap_cnt; /* number of pages to swap on next pass */
 223         unsigned long swap_address;
 224         /*
 225          * This is an architecture-specific pointer: the portable
 226          * part of Linux does not know about any segments.
 227          */
 228         void * segments;
 229 };
 230
 231 #define INIT_MM(name) {                                 \
 232                 &init_mmap, NULL, NULL,                 \
 233                 swapper_pg_dir,                         \
 234                 ATOMIC_INIT(2), ATOMIC_INIT(1), 1,      \
 235                 __MUTEX_INITIALIZER(name.mmap_sem),     \
 236                 SPIN_LOCK_UNLOCKED,                     \
 237                 0,                                      \
 238                 0, 0, 0, 0,                             \
 239                 0, 0, 0,                                \
 240                 0, 0, 0, 0,                             \
 241                 0, 0, 0,                                \
 242                 0, 0, 0, 0, NULL }
 243
 244 struct signal_struct {
 245         atomic_t                count;
 246         struct k_sigaction      action[_NSIG];
 247         spinlock_t              siglock;
 248 };
 249
 250
 251 #define INIT_SIGNALS { \
 252                 ATOMIC_INIT(1), \
 253                 { {{0,}}, }, \
 254                 SPIN_LOCK_UNLOCKED }
 255
 256 /*
 257  * Some day this will be a full-fledged user tracking system..
 258  * Right now it is only used to track how many processes a
 259  * user has, but it has the potential to track memory usage etc.
 260  */
 261 struct user_struct;
 262
 263 struct task_struct {
 264 /* these are hardcoded - don't touch */
 265         volatile long state;    /* -1 unrunnable, 0 runnable, >0 stopped */
 266         unsigned long flags;    /* per process flags, defined below */
 267         int sigpending;
 268         mm_segment_t addr_limit;        /* thread address space:
 269                                                 0-0xBFFFFFFF for user-thead
 270                                                 0-0xFFFFFFFF for kernel-thread
 271                                          */
 272         struct exec_domain *exec_domain;
 273         volatile long need_resched;
 274
 275 /* various fields */
 276         long counter;
 277         long priority;
 278         cycles_t avg_slice;
 279 /* SMP and runqueue state */
 280         int has_cpu;
 281         int processor;
 282         int last_processor;
 283         int lock_depth;         /* Lock depth. We can context switch in and out of holding a syscall kernel lock... */
 284         struct task_struct *next_task, *prev_task;
 285         struct list_head run_list;
 286
 287 /* task state */
 288         struct linux_binfmt *binfmt;
 289         int exit_code, exit_signal;
 290         int pdeath_signal;  /*  The signal sent when the parent dies  */
 291         /* ??? */
 292         unsigned long personality;
 293         int dumpable:1;
 294         int did_exec:1;
 295         pid_t pid;
 296         pid_t pgrp;
 297         pid_t tty_old_pgrp;
 298         pid_t session;
 299         /* boolean value for session group leader */
 300         int leader;
 301         /*
 302          * pointers to (original) parent process, youngest child, younger sibling,
 303          * older sibling, respectively.  (p->father can be replaced with
 304          * p->p_pptr->pid)
 305          */
 306         struct task_struct *p_opptr, *p_pptr, *p_cptr, *p_ysptr, *p_osptr;
 307
 308         /* PID hash table linkage. */
 309         struct task_struct *pidhash_next;
 310         struct task_struct **pidhash_pprev;
 311
 312         wait_queue_head_t wait_chldexit;        /* for wait4() */
 313         struct semaphore *vfork_sem;            /* for vfork() */
 314         unsigned long policy, rt_priority;
 315         unsigned long it_real_value, it_prof_value, it_virt_value;
 316         unsigned long it_real_incr, it_prof_incr, it_virt_incr;
 317         struct timer_list real_timer;
 318         struct tms times;
 319         unsigned long start_time;
 320         long per_cpu_utime[NR_CPUS], per_cpu_stime[NR_CPUS];
 321 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
 322         unsigned long min_flt, maj_flt, nswap, cmin_flt, cmaj_flt, cnswap;
 323         int swappable:1;
 324 /* process credentials */
 325         uid_t uid,euid,suid,fsuid;
 326         gid_t gid,egid,sgid,fsgid;
 327         int ngroups;
 328         gid_t   groups[NGROUPS];
 329         kernel_cap_t   cap_effective, cap_inheritable, cap_permitted;
 330         struct user_struct *user;
 331 /* limits */
 332         struct rlimit rlim[RLIM_NLIMITS];
 333         unsigned short used_math;
 334         char comm[16];
 335 /* file system info */
 336         int link_count;
 337         struct tty_struct *tty; /* NULL if no tty */
 338 /* ipc stuff */
 339         struct sem_undo *semundo;
 340         struct sem_queue *semsleeping;
 341 /* CPU-specific state of this task */
 342         struct thread_struct thread;
 343 /* filesystem information */
 344         struct fs_struct *fs;
 345 /* open file information */
 346         struct files_struct *files;
 347
 348 /* memory management info */
 349         struct mm_struct *mm, *active_mm;
 350
 351 /* signal handlers */
 352         spinlock_t sigmask_lock;        /* Protects signal and blocked */
 353         struct signal_struct *sig;
 354         sigset_t signal, blocked;
 355         struct signal_queue *sigqueue, **sigqueue_tail;
 356         unsigned long sas_ss_sp;
 357         size_t sas_ss_size;
 358 };
 359
 360 /*
 361  * Per process flags
 362  */
 363 #define PF_ALIGNWARN    0x00000001      /* Print alignment warning msgs */
 364                                         /* Not implemented yet, only for 486*/
 365 #define PF_STARTING     0x00000002      /* being created */
 366 #define PF_EXITING      0x00000004      /* getting shut down */
 367 #define PF_PTRACED      0x00000010      /* set if ptrace (0) has been called */
 368 #define PF_TRACESYS     0x00000020      /* tracing system calls */
 369 #define PF_FORKNOEXEC   0x00000040      /* forked but didn't exec */
 370 #define PF_SUPERPRIV    0x00000100      /* used super-user privileges */
 371 #define PF_DUMPCORE     0x00000200      /* dumped core */
 372 #define PF_SIGNALED     0x00000400      /* killed by a signal */
 373 #define PF_MEMALLOC     0x00000800      /* Allocating memory */
 374 #define PF_VFORK        0x00001000      /* Wake up parent in mm_release */
 375
 376 #define PF_USEDFPU      0x00100000      /* task used FPU this quantum (SMP) */
 377 #define PF_DTRACE       0x00200000      /* delayed trace (used on m68k, i386) */
 378
 379 /*
 380  * Limit the stack by to some sane default: root can always
 381  * increase this limit if needed..  8MB seems reasonable.
 382  */
 383 #define _STK_LIM        (8*1024*1024)
 384
 385 #define DEF_PRIORITY    (20*HZ/100)     /* 200 ms time slices */
 386
 387 /*
 388  *  INIT_TASK is used to set up the first task table, touch at
 389  * your own risk!. Base=0, limit=0x1fffff (=2MB)
 390  */
 391 #define INIT_TASK(name) \
 392 /* state etc */ { 0,0,0,KERNEL_DS,&default_exec_domain,0, \
 393 /* counter */   DEF_PRIORITY,DEF_PRIORITY,0, \
 394 /* SMP */       0,0,0,-1, \
 395 /* schedlink */ &init_task,&init_task, LIST_HEAD_INIT(init_task.run_list), \
 396 /* binfmt */    NULL, \
 397 /* ec,brk... */ 0,0,0,0,0,0, \
 398 /* pid etc.. */ 0,0,0,0,0, \
 399 /* proc links*/ &init_task,&init_task,NULL,NULL,NULL, \
 400 /* pidhash */   NULL, NULL, \
 401 /* chld wait */ __WAIT_QUEUE_HEAD_INITIALIZER(name.wait_chldexit), NULL, \
 402 /* timeout */   SCHED_OTHER,0,0,0,0,0,0,0, \
 403 /* timer */     { NULL, NULL, 0, 0, it_real_fn }, \
 404 /* utime */     {0,0,0,0},0, \
 405 /* per CPU times */ {0, }, {0, }, \
 406 /* flt */       0,0,0,0,0,0, \
 407 /* swp */       0, \
 408 /* process credentials */                                       \
 409 /* uid etc */   0,0,0,0,0,0,0,0,                                \
 410 /* suppl grps*/ 0, {0,},                                        \
 411 /* caps */      CAP_INIT_EFF_SET,CAP_INIT_INH_SET,CAP_FULL_SET, \
 412 /* user */      NULL,                                           \
 413 /* rlimits */   INIT_RLIMITS, \
 414 /* math */      0, \
 415 /* comm */      "swapper", \
 416 /* fs info */   0,NULL, \
 417 /* ipc */       NULL, NULL, \
 418 /* thread */    INIT_THREAD, \
 419 /* fs */        &init_fs, \
 420 /* files */     &init_files, \
 421 /* mm */        NULL, &init_mm, \
 422 /* signals */   SPIN_LOCK_UNLOCKED, &init_signals, {{0}}, {{0}}, NULL, &init_task.sigqueue, 0, 0, \
 423 }
 424
 425 #ifndef INIT_TASK_SIZE
 426 # define INIT_TASK_SIZE 2048*sizeof(long)
 427 #endif
 428
 429 union task_union {
 430         struct task_struct task;
 431         unsigned long stack[INIT_TASK_SIZE/sizeof(long)];
 432 };
 433
 434 extern union task_union init_task_union;
 435
 436 extern struct   mm_struct init_mm;
 437 extern struct task_struct *init_tasks[NR_CPUS];
 438
 439 /* PID hashing. (shouldnt this be dynamic?) */
 440 #define PIDHASH_SZ (4096 >> 2)
 441 extern struct task_struct *pidhash[PIDHASH_SZ];
 442
 443 #define pid_hashfn(x)   ((((x) >> 8) ^ (x)) & (PIDHASH_SZ - 1))
 444
 445 extern __inline__ void hash_pid(struct task_struct *p)
 446 {
 447         struct task_struct **htable = &pidhash[pid_hashfn(p->pid)];
 448
 449         if((p->pidhash_next = *htable) != NULL)
 450                 (*htable)->pidhash_pprev = &p->pidhash_next;
 451         *htable = p;
 452         p->pidhash_pprev = htable;
 453 }
 454
 455 extern __inline__ void unhash_pid(struct task_struct *p)
 456 {
 457         if(p->pidhash_next)
 458                 p->pidhash_next->pidhash_pprev = p->pidhash_pprev;
 459         *p->pidhash_pprev = p->pidhash_next;
 460 }
 461
 462 extern __inline__ struct task_struct *find_task_by_pid(int pid)
 463 {
 464         struct task_struct *p, **htable = &pidhash[pid_hashfn(pid)];
 465
 466         for(p = *htable; p && p->pid != pid; p = p->pidhash_next)
 467                 ;
 468
 469         return p;
 470 }
 471
 472 /* per-UID process charging. */
 473 extern int alloc_uid(struct task_struct *);
 474 void free_uid(struct task_struct *);
 475
 476 #include <asm/current.h>
 477
 478 extern unsigned long volatile jiffies;
 479 extern unsigned long itimer_ticks;
 480 extern unsigned long itimer_next;
 481 extern struct timeval xtime;
 482 extern void do_timer(struct pt_regs *);
 483
 484 extern unsigned int * prof_buffer;
 485 extern unsigned long prof_len;
 486 extern unsigned long prof_shift;
 487
 488 #define CURRENT_TIME (xtime.tv_sec)
 489
 490 extern void FASTCALL(__wake_up(wait_queue_head_t *q, unsigned int mode));
 491 extern void FASTCALL(sleep_on(wait_queue_head_t *q));
 492 extern long FASTCALL(sleep_on_timeout(wait_queue_head_t *q,
 493                                       signed long timeout));
 494 extern void FASTCALL(interruptible_sleep_on(wait_queue_head_t *q));
 495 extern long FASTCALL(interruptible_sleep_on_timeout(wait_queue_head_t *q,
 496                                                     signed long timeout));
 497 extern void FASTCALL(wake_up_process(struct task_struct * tsk));
 498
 499 #define wake_up(x)                      __wake_up((x),TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE)
 500 #define wake_up_interruptible(x)        __wake_up((x),TASK_INTERRUPTIBLE)
 501
 502 extern int in_group_p(gid_t);
 503
 504 extern void flush_signals(struct task_struct *);
 505 extern void flush_signal_handlers(struct task_struct *);
 506 extern int dequeue_signal(sigset_t *, siginfo_t *);
 507 extern int send_sig_info(int, struct siginfo *, struct task_struct *);
 508 extern int force_sig_info(int, struct siginfo *, struct task_struct *);
 509 extern int kill_pg_info(int, struct siginfo *, pid_t);
 510 extern int kill_sl_info(int, struct siginfo *, pid_t);
 511 extern int kill_proc_info(int, struct siginfo *, pid_t);
 512 extern int kill_something_info(int, struct siginfo *, int);
 513 extern void notify_parent(struct task_struct *, int);
 514 extern void force_sig(int, struct task_struct *);
 515 extern int send_sig(int, struct task_struct *, int);
 516 extern int kill_pg(pid_t, int, int);
 517 extern int kill_sl(pid_t, int, int);
 518 extern int kill_proc(pid_t, int, int);
 519 extern int do_sigaction(int, const struct k_sigaction *, struct k_sigaction *);
 520 extern int do_sigaltstack(const stack_t *, stack_t *, unsigned long);
 521
 522 extern inline int signal_pending(struct task_struct *p)
 523 {
 524         return (p->sigpending != 0);
 525 }
 526
 527 /* Reevaluate whether the task has signals pending delivery.
 528    This is required every time the blocked sigset_t changes.
 529    All callers should have t->sigmask_lock.  */
 530
 531 static inline void recalc_sigpending(struct task_struct *t)
 532 {
 533         unsigned long ready;
 534         long i;
 535
 536         switch (_NSIG_WORDS) {
 537         default:
 538                 for (i = _NSIG_WORDS, ready = 0; --i >= 0 ;)
 539                         ready |= t->signal.sig[i] &~ t->blocked.sig[i];
 540                 break;
 541
 542         case 4: ready  = t->signal.sig[3] &~ t->blocked.sig[3];
 543                 ready |= t->signal.sig[2] &~ t->blocked.sig[2];
 544                 ready |= t->signal.sig[1] &~ t->blocked.sig[1];
 545                 ready |= t->signal.sig[0] &~ t->blocked.sig[0];
 546                 break;
 547
 548         case 2: ready  = t->signal.sig[1] &~ t->blocked.sig[1];
 549                 ready |= t->signal.sig[0] &~ t->blocked.sig[0];
 550                 break;
 551
 552         case 1: ready  = t->signal.sig[0] &~ t->blocked.sig[0];
 553         }
 554
 555         t->sigpending = (ready != 0);
 556 }
 557
 558 /* True if we are on the alternate signal stack.  */
 559
 560 static inline int on_sig_stack(unsigned long sp)
 561 {
 562         return (sp - current->sas_ss_sp < current->sas_ss_size);
 563 }
 564
 565 static inline int sas_ss_flags(unsigned long sp)
 566 {
 567         return (current->sas_ss_size == 0 ? SS_DISABLE
 568                 : on_sig_stack(sp) ? SS_ONSTACK : 0);
 569 }
 570
 571 extern int request_irq(unsigned int,
 572                        void (*handler)(int, void *, struct pt_regs *),
 573                        unsigned long, const char *, void *);
 574 extern void free_irq(unsigned int, void *);
 575
 576 /*
 577  * This has now become a routine instead of a macro, it sets a flag if
 578  * it returns true (to do BSD-style accounting where the process is flagged
 579  * if it uses root privs). The implication of this is that you should do
 580  * normal permissions checks first, and check suser() last.
 581  *
 582  * [Dec 1997 -- Chris Evans]
 583  * For correctness, the above considerations need to be extended to
 584  * fsuser(). This is done, along with moving fsuser() checks to be
 585  * last.
 586  *
 587  * These will be removed, but in the mean time, when the SECURE_NOROOT
 588  * flag is set, uids don't grant privilege.
 589  */
 590 extern inline int suser(void)
 591 {
 592         if (!issecure(SECURE_NOROOT) && current->euid == 0) {
 593                 current->flags |= PF_SUPERPRIV;
 594                 return 1;
 595         }
 596         return 0;
 597 }
 598
 599 extern inline int fsuser(void)
 600 {
 601         if (!issecure(SECURE_NOROOT) && current->fsuid == 0) {
 602                 current->flags |= PF_SUPERPRIV;
 603                 return 1;
 604         }
 605         return 0;
 606 }
 607
 608 /*
 609  * capable() checks for a particular capability.
 610  * New privilege checks should use this interface, rather than suser() or
 611  * fsuser(). See include/linux/capability.h for defined capabilities.
 612  */
 613
 614 extern inline int capable(int cap)
 615 {
 616 #if 1 /* ok now */
 617         if (cap_raised(current->cap_effective, cap))
 618 #else
 619         if (cap_is_fs_cap(cap) ? current->fsuid == 0 : current->euid == 0)
 620 #endif
 621         {
 622                 current->flags |= PF_SUPERPRIV;
 623                 return 1;
 624         }
 625         return 0;
 626 }
 627
 628 /*
 629  * Routines for handling mm_structs
 630  */
 631 extern struct mm_struct * mm_alloc(void);
 632
 633 extern struct mm_struct * start_lazy_tlb(void);
 634 extern void end_lazy_tlb(struct mm_struct *mm);
 635
 636 /* mmdrop drops the mm and the page tables */
 637 extern inline void FASTCALL(__mmdrop(struct mm_struct *));
 638 static inline void mmdrop(struct mm_struct * mm)
 639 {
 640         if (atomic_dec_and_test(&mm->mm_count))
 641                 __mmdrop(mm);
 642 }
 643
 644 /* mmput gets rid of the mappings and all user-space */
 645 extern void mmput(struct mm_struct *);
 646 /* Remove the current tasks stale references to the old mm_struct */
 647 extern void mm_release(void);
 648
 649 /*
 650  * Routines for handling the fd arrays
 651  */
 652 extern struct file ** alloc_fd_array(int);
 653 extern int expand_fd_array(struct files_struct *, int nr);
 654 extern void free_fd_array(struct file **, int);
 655
 656 extern fd_set *alloc_fdset(int);
 657 extern int expand_fdset(struct files_struct *, int nr);
 658 extern void free_fdset(fd_set *, int);
 659
 660 /* Expand files.  Return <0 on error; 0 nothing done; 1 files expanded,
 661  * we may have blocked.
 662  *
 663  * Should be called with the files->file_lock spinlock held for write.
 664  */
 665 static inline int expand_files(struct files_struct *files, int nr)
 666 {
 667         int err, expand = 0;
 668 #ifdef FDSET_DEBUG
 669         printk (KERN_ERR __FUNCTION__ " %d: nr = %d\n", current->pid, nr);
 670 #endif
 671
 672         if (nr >= files->max_fdset) {
 673                 expand = 1;
 674                 if ((err = expand_fdset(files, nr)))
 675                         goto out;
 676         }
 677         if (nr >= files->max_fds) {
 678                 expand = 1;
 679                 if ((err = expand_fd_array(files, nr)))
 680                         goto out;
 681         }
 682         err = expand;
 683  out:
 684 #ifdef FDSET_DEBUG
 685         if (err)
 686                 printk (KERN_ERR __FUNCTION__ " %d: return %d\n", current->pid, err);
 687 #endif
 688         return err;
 689 }
 690
 691 extern int  copy_thread(int, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
 692 extern void flush_thread(void);
 693 extern void exit_thread(void);
 694
 695 extern void exit_mm(struct task_struct *);
 696 extern void exit_fs(struct task_struct *);
 697 extern void exit_files(struct task_struct *);
 698 extern void exit_sighand(struct task_struct *);
 699
 700 extern int do_execve(char *, char **, char **, struct pt_regs *);
 701 extern int do_fork(unsigned long, unsigned long, struct pt_regs *);
 702
 703 extern inline void add_wait_queue(wait_queue_head_t *q, wait_queue_t * wait)
 704 {
 705         unsigned long flags;
 706
 707         wq_write_lock_irqsave(&q->lock, flags);
 708         __add_wait_queue(q, wait);
 709         wq_write_unlock_irqrestore(&q->lock, flags);
 710 }
 711
 712 extern inline void add_wait_queue_exclusive(wait_queue_head_t *q,
 713                                                         wait_queue_t * wait)
 714 {
 715         unsigned long flags;
 716
 717         wq_write_lock_irqsave(&q->lock, flags);
 718         __add_wait_queue_tail(q, wait);
 719         wq_write_unlock_irqrestore(&q->lock, flags);
 720 }
 721
 722 extern inline void remove_wait_queue(wait_queue_head_t *q, wait_queue_t * wait)
 723 {
 724         unsigned long flags;
 725
 726         wq_write_lock_irqsave(&q->lock, flags);
 727         __remove_wait_queue(q, wait);
 728         wq_write_unlock_irqrestore(&q->lock, flags);
 729 }
 730
 731 #define __wait_event(wq, condition)                                     \
 732 do {                                                                    \
 733         wait_queue_t __wait;                                            \
 734         init_waitqueue_entry(&__wait, current);                         \
 735                                                                         \
 736         add_wait_queue(&wq, &__wait);                                   \
 737         for (;;) {                                                      \
 738                 set_current_state(TASK_UNINTERRUPTIBLE);                \
 739                 if (condition)                                          \
 740                         break;                                          \
 741                 schedule();                                             \
 742         }                                                               \
 743         current->state = TASK_RUNNING;                                  \
 744         remove_wait_queue(&wq, &__wait);                                \
 745 } while (0)
 746
 747 #define wait_event(wq, condition)                                       \
 748 do {                                                                    \
 749         if (condition)                                                  \
 750                 break;                                                  \
 751         __wait_event(wq, condition);                                    \
 752 } while (0)
 753
 754 #define __wait_event_interruptible(wq, condition, ret)                  \
 755 do {                                                                    \
 756         wait_queue_t __wait;                                            \
 757         init_waitqueue_entry(&__wait, current);                         \
 758                                                                         \
 759         add_wait_queue(&wq, &__wait);                                   \
 760         for (;;) {                                                      \
 761                 set_current_state(TASK_INTERRUPTIBLE);                  \
 762                 if (condition)                                          \
 763                         break;                                          \
 764                 if (!signal_pending(current)) {                         \
 765                         schedule();                                     \
 766                         continue;                                       \
 767                 }                                                       \
 768                 ret = -ERESTARTSYS;                                     \
 769                 break;                                                  \
 770         }                                                               \
 771         current->state = TASK_RUNNING;                                  \
 772         remove_wait_queue(&wq, &__wait);                                \
 773 } while (0)
 774
 775 #define wait_event_interruptible(wq, condition)                         \
 776 ({                                                                      \
 777         int __ret = 0;                                                  \
 778         if (!(condition))                                               \
 779                 __wait_event_interruptible(wq, condition, __ret);       \
 780         __ret;                                                          \
 781 })
 782
 783 #define REMOVE_LINKS(p) do { \
 784         (p)->next_task->prev_task = (p)->prev_task; \
 785         (p)->prev_task->next_task = (p)->next_task; \
 786         if ((p)->p_osptr) \
 787                 (p)->p_osptr->p_ysptr = (p)->p_ysptr; \
 788         if ((p)->p_ysptr) \
 789                 (p)->p_ysptr->p_osptr = (p)->p_osptr; \
 790         else \
 791                 (p)->p_pptr->p_cptr = (p)->p_osptr; \
 792         } while (0)
 793
 794 #define SET_LINKS(p) do { \
 795         (p)->next_task = &init_task; \
 796         (p)->prev_task = init_task.prev_task; \
 797         init_task.prev_task->next_task = (p); \
 798         init_task.prev_task = (p); \
 799         (p)->p_ysptr = NULL; \
 800         if (((p)->p_osptr = (p)->p_pptr->p_cptr) != NULL) \
 801                 (p)->p_osptr->p_ysptr = p; \
 802         (p)->p_pptr->p_cptr = p; \
 803         } while (0)
 804
 805 #define for_each_task(p) \
 806         for (p = &init_task ; (p = p->next_task) != &init_task ; )
 807
 808
 809 static inline void del_from_runqueue(struct task_struct * p)
 810 {
 811         nr_running--;
 812         list_del(&p->run_list);
 813         p->run_list.next = NULL;
 814 }
 815
 816 extern inline int task_on_runqueue(struct task_struct *p)
 817 {
 818         return (p->run_list.next != NULL);
 819 }
 820
 821 extern inline void unhash_process(struct task_struct *p)
 822 {
 823         if (task_on_runqueue(p)) BUG();
 824         nr_threads--;
 825         write_lock_irq(&tasklist_lock);
 826         unhash_pid(p);
 827         REMOVE_LINKS(p);
 828         write_unlock_irq(&tasklist_lock);
 829 }
 830
 831 #endif /* __KERNEL__ */
 832
 833 #endif