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/config.h>
   9 #include <linux/binfmts.h>
  10 #include <linux/personality.h>
  11 #include <linux/threads.h>
  12 #include <linux/kernel.h>
  13 #include <linux/types.h>
  14 #include <linux/times.h>
  15 #include <linux/timex.h>
  16
  17 #include <asm/system.h>
  18 #include <asm/semaphore.h>
  19 #include <asm/page.h>
  20 #include <asm/ptrace.h>
  21 #include <asm/mmu.h>
  22
  23 #include <linux/smp.h>
  24 #include <linux/tty.h>
  25 #include <linux/sem.h>
  26 #include <linux/signal.h>
  27 #include <linux/securebits.h>
  28 #include <linux/fs_struct.h>
  29
  30 /*
  31  * cloning flags:
  32  */
  33 #define CSIGNAL         0x000000ff      /* signal mask to be sent at exit */
  34 #define CLONE_VM        0x00000100      /* set if VM shared between processes */
  35 #define CLONE_FS        0x00000200      /* set if fs info shared between processes */
  36 #define CLONE_FILES     0x00000400      /* set if open files shared between processes */
  37 #define CLONE_SIGHAND   0x00000800      /* set if signal handlers and blocked signals shared */
  38 #define CLONE_PID       0x00001000      /* set if pid shared */
  39 #define CLONE_PTRACE    0x00002000      /* set if we want to let tracing continue on the child too */
  40 #define CLONE_VFORK     0x00004000      /* set if the parent wants the child to wake it up on mm_release */
  41 #define CLONE_PARENT    0x00008000      /* set if we want to have the same parent as the cloner */
  42 #define CLONE_THREAD    0x00010000      /* Same thread group? */
  43
  44 #define CLONE_SIGNAL    (CLONE_SIGHAND | CLONE_THREAD)
  45
  46 /*
  47  * These are the constant used to fake the fixed-point load-average
  48  * counting. Some notes:
  49  *  - 11 bit fractions expand to 22 bits by the multiplies: this gives
  50  *    a load-average precision of 10 bits integer + 11 bits fractional
  51  *  - if you want to count load-averages more often, you need more
  52  *    precision, or rounding will get you. With 2-second counting freq,
  53  *    the EXP_n values would be 1981, 2034 and 2043 if still using only
  54  *    11 bit fractions.
  55  */
  56 extern unsigned long avenrun[];         /* Load averages */
  57
  58 #define FSHIFT          11              /* nr of bits of precision */
  59 #define FIXED_1         (1<<FSHIFT)     /* 1.0 as fixed-point */
  60 #define LOAD_FREQ       (5*HZ)          /* 5 sec intervals */
  61 #define EXP_1           1884            /* 1/exp(5sec/1min) as fixed-point */
  62 #define EXP_5           2014            /* 1/exp(5sec/5min) */
  63 #define EXP_15          2037            /* 1/exp(5sec/15min) */
  64
  65 #define CALC_LOAD(load,exp,n) \
  66         load *= exp; \
  67         load += n*(FIXED_1-exp); \
  68         load >>= FSHIFT;
  69
  70 #define CT_TO_SECS(x)   ((x) / HZ)
  71 #define CT_TO_USECS(x)  (((x) % HZ) * 1000000/HZ)
  72
  73 extern int nr_running, nr_threads;
  74 extern int last_pid;
  75
  76 #include <linux/fs.h>
  77 #include <linux/time.h>
  78 #include <linux/param.h>
  79 #include <linux/resource.h>
  80 #include <linux/timer.h>
  81
  82 #include <asm/processor.h>
  83
  84 #define TASK_RUNNING            0
  85 #define TASK_INTERRUPTIBLE      1
  86 #define TASK_UNINTERRUPTIBLE    2
  87 #define TASK_ZOMBIE             4
  88 #define TASK_STOPPED            8
  89
  90 #define __set_task_state(tsk, state_value)              \
  91         do { (tsk)->state = (state_value); } while (0)
  92 #ifdef CONFIG_SMP
  93 #define set_task_state(tsk, state_value)                \
  94         set_mb((tsk)->state, (state_value))
  95 #else
  96 #define set_task_state(tsk, state_value)                \
  97         __set_task_state((tsk), (state_value))
  98 #endif
  99
 100 #define __set_current_state(state_value)                        \
 101         do { current->state = (state_value); } while (0)
 102 #ifdef CONFIG_SMP
 103 #define set_current_state(state_value)          \
 104         set_mb(current->state, (state_value))
 105 #else
 106 #define set_current_state(state_value)          \
 107         __set_current_state(state_value)
 108 #endif
 109
 110 /*
 111  * Scheduling policies
 112  */
 113 #define SCHED_OTHER             0
 114 #define SCHED_FIFO              1
 115 #define SCHED_RR                2
 116
 117 /*
 118  * This is an additional bit set when we want to
 119  * yield the CPU for one re-schedule..
 120  */
 121 #define SCHED_YIELD             0x10
 122
 123 struct sched_param {
 124         int sched_priority;
 125 };
 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 extern void update_process_times(int user);
 146 extern void update_one_process(struct task_struct *p, unsigned long user,
 147                                unsigned long system, int cpu);
 148
 149 #define MAX_SCHEDULE_TIMEOUT    LONG_MAX
 150 extern signed long FASTCALL(schedule_timeout(signed long timeout));
 151 asmlinkage void schedule(void);
 152
 153 extern int schedule_task(struct tq_struct *task);
 154 extern void flush_scheduled_tasks(void);
 155 extern int start_context_thread(void);
 156 extern int current_is_keventd(void);
 157
 158 /*
 159  * The default fd array needs to be at least BITS_PER_LONG,
 160  * as this is the granularity returned by copy_fdset().
 161  */
 162 #define NR_OPEN_DEFAULT BITS_PER_LONG
 163
 164 /*
 165  * Open file table structure
 166  */
 167 struct files_struct {
 168         atomic_t count;
 169         rwlock_t file_lock;
 170         int max_fds;
 171         int max_fdset;
 172         int next_fd;
 173         struct file ** fd;      /* current fd array */
 174         fd_set *close_on_exec;
 175         fd_set *open_fds;
 176         fd_set close_on_exec_init;
 177         fd_set open_fds_init;
 178         struct file * fd_array[NR_OPEN_DEFAULT];
 179 };
 180
 181 #define INIT_FILES \
 182 {                                                       \
 183         count:          ATOMIC_INIT(1),                 \
 184         file_lock:      RW_LOCK_UNLOCKED,               \
 185         max_fds:        NR_OPEN_DEFAULT,                \
 186         max_fdset:      __FD_SETSIZE,                   \
 187         next_fd:        0,                              \
 188         fd:             &init_files.fd_array[0],        \
 189         close_on_exec:  &init_files.close_on_exec_init, \
 190         open_fds:       &init_files.open_fds_init,      \
 191         close_on_exec_init: { { 0, } },                 \
 192         open_fds_init:  { { 0, } },                     \
 193         fd_array:       { NULL, }                       \
 194 }
 195
 196 /* Maximum number of active map areas.. This is a random (large) number */
 197 #define MAX_MAP_COUNT   (65536)
 198
 199 /* Number of map areas at which the AVL tree is activated. This is arbitrary. */
 200 #define AVL_MIN_MAP_COUNT       32
 201
 202 struct mm_struct {
 203         struct vm_area_struct * mmap;           /* list of VMAs */
 204         struct vm_area_struct * mmap_avl;       /* tree of VMAs */
 205         struct vm_area_struct * mmap_cache;     /* last find_vma result */
 206         pgd_t * pgd;
 207         atomic_t mm_users;                      /* How many users with user space? */
 208         atomic_t mm_count;                      /* How many references to "struct mm_struct" (users count as 1) */
 209         int map_count;                          /* number of VMAs */
 210         struct semaphore mmap_sem;
 211         spinlock_t page_table_lock;
 212         unsigned long start_code, end_code, start_data, end_data;
 213         unsigned long start_brk, brk, start_stack;
 214         unsigned long arg_start, arg_end, env_start, env_end;
 215         unsigned long rss, total_vm, locked_vm;
 216         unsigned long def_flags;
 217         unsigned long cpu_vm_mask;
 218         unsigned long swap_cnt; /* number of pages to swap on next pass */
 219         unsigned long swap_address;
 220
 221         /* Architecture-specific MM context */
 222         mm_context_t context;
 223 };
 224
 225 #define INIT_MM(name) \
 226 {                                                       \
 227         mmap:           &init_mmap,                     \
 228         mmap_avl:       NULL,                           \
 229         mmap_cache:     NULL,                           \
 230         pgd:            swapper_pg_dir,                 \
 231         mm_users:       ATOMIC_INIT(2),                 \
 232         mm_count:       ATOMIC_INIT(1),                 \
 233         map_count:      1,                              \
 234         mmap_sem:       __MUTEX_INITIALIZER(name.mmap_sem), \
 235         page_table_lock: SPIN_LOCK_UNLOCKED,            \
 236 }
 237
 238 struct signal_struct {
 239         atomic_t                count;
 240         struct k_sigaction      action[_NSIG];
 241         spinlock_t              siglock;
 242 };
 243
 244
 245 #define INIT_SIGNALS {  \
 246         count:          ATOMIC_INIT(1),                 \
 247         action:         { {{0,}}, },                    \
 248         siglock:        SPIN_LOCK_UNLOCKED              \
 249 }
 250
 251 /*
 252  * Some day this will be a full-fledged user tracking system..
 253  */
 254 struct user_struct {
 255         atomic_t __count;       /* reference count */
 256         atomic_t processes;     /* How many processes does this user have? */
 257         atomic_t files;         /* How many open files does this user have? */
 258
 259         /* Hash table maintenance information */
 260         struct user_struct *next, **pprev;
 261         uid_t uid;
 262 };
 263
 264 #define get_current_user() ({                           \
 265         struct user_struct *__user = current->user;     \
 266         atomic_inc(&__user->__count);                   \
 267         __user; })
 268
 269 extern struct user_struct root_user;
 270 #define INIT_USER (&root_user)
 271
 272 struct task_struct {
 273         /*
 274          * offsets of these are hardcoded elsewhere - touch with care
 275          */
 276         volatile long state;    /* -1 unrunnable, 0 runnable, >0 stopped */
 277         unsigned long flags;    /* per process flags, defined below */
 278         int sigpending;
 279         mm_segment_t addr_limit;        /* thread address space:
 280                                                 0-0xBFFFFFFF for user-thead
 281                                                 0-0xFFFFFFFF for kernel-thread
 282                                          */
 283         struct exec_domain *exec_domain;
 284         volatile long need_resched;
 285         unsigned long ptrace;
 286
 287         int lock_depth;         /* Lock depth */
 288
 289 /*
 290  * offset 32 begins here on 32-bit platforms. We keep
 291  * all fields in a single cacheline that are needed for
 292  * the goodness() loop in schedule().
 293  */
 294         long counter;
 295         long nice;
 296         unsigned long policy;
 297         struct mm_struct *mm;
 298         int has_cpu, processor;
 299         unsigned long cpus_allowed;
 300         /*
 301          * (only the 'next' pointer fits into the cacheline, but
 302          * that's just fine.)
 303          */
 304         struct list_head run_list;
 305         unsigned long sleep_time;
 306
 307         struct task_struct *next_task, *prev_task;
 308         struct mm_struct *active_mm;
 309
 310 /* task state */
 311         struct linux_binfmt *binfmt;
 312         int exit_code, exit_signal;
 313         int pdeath_signal;  /*  The signal sent when the parent dies  */
 314         /* ??? */
 315         unsigned long personality;
 316         int dumpable:1;
 317         int did_exec:1;
 318         pid_t pid;
 319         pid_t pgrp;
 320         pid_t tty_old_pgrp;
 321         pid_t session;
 322         pid_t tgid;
 323         /* boolean value for session group leader */
 324         int leader;
 325         /*
 326          * pointers to (original) parent process, youngest child, younger sibling,
 327          * older sibling, respectively.  (p->father can be replaced with
 328          * p->p_pptr->pid)
 329          */
 330         struct task_struct *p_opptr, *p_pptr, *p_cptr, *p_ysptr, *p_osptr;
 331         struct list_head thread_group;
 332
 333         /* PID hash table linkage. */
 334         struct task_struct *pidhash_next;
 335         struct task_struct **pidhash_pprev;
 336
 337         wait_queue_head_t wait_chldexit;        /* for wait4() */
 338         struct semaphore *vfork_sem;            /* for vfork() */
 339         unsigned long rt_priority;
 340         unsigned long it_real_value, it_prof_value, it_virt_value;
 341         unsigned long it_real_incr, it_prof_incr, it_virt_incr;
 342         struct timer_list real_timer;
 343         struct tms times;
 344         unsigned long start_time;
 345         long per_cpu_utime[NR_CPUS], per_cpu_stime[NR_CPUS];
 346 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
 347         unsigned long min_flt, maj_flt, nswap, cmin_flt, cmaj_flt, cnswap;
 348         int swappable:1;
 349 /* process credentials */
 350         uid_t uid,euid,suid,fsuid;
 351         gid_t gid,egid,sgid,fsgid;
 352         int ngroups;
 353         gid_t   groups[NGROUPS];
 354         kernel_cap_t   cap_effective, cap_inheritable, cap_permitted;
 355         int keep_capabilities:1;
 356         struct user_struct *user;
 357 /* limits */
 358         struct rlimit rlim[RLIM_NLIMITS];
 359         unsigned short used_math;
 360         char comm[16];
 361 /* file system info */
 362         int link_count;
 363         struct tty_struct *tty; /* NULL if no tty */
 364         unsigned int locks; /* How many file locks are being held */
 365 /* ipc stuff */
 366         struct sem_undo *semundo;
 367         struct sem_queue *semsleeping;
 368 /* CPU-specific state of this task */
 369         struct thread_struct thread;
 370 /* filesystem information */
 371         struct fs_struct *fs;
 372 /* open file information */
 373         struct files_struct *files;
 374 /* signal handlers */
 375         spinlock_t sigmask_lock;        /* Protects signal and blocked */
 376         struct signal_struct *sig;
 377
 378         sigset_t blocked;
 379         struct sigpending pending;
 380
 381         unsigned long sas_ss_sp;
 382         size_t sas_ss_size;
 383         int (*notifier)(void *priv);
 384         void *notifier_data;
 385         sigset_t *notifier_mask;
 386
 387 /* Thread group tracking */
 388         u32 parent_exec_id;
 389         u32 self_exec_id;
 390 /* Protection of (de-)allocation: mm, files, fs, tty */
 391         spinlock_t alloc_lock;
 392 };
 393
 394 /*
 395  * Per process flags
 396  */
 397 #define PF_ALIGNWARN    0x00000001      /* Print alignment warning msgs */
 398                                         /* Not implemented yet, only for 486*/
 399 #define PF_STARTING     0x00000002      /* being created */
 400 #define PF_EXITING      0x00000004      /* getting shut down */
 401 #define PF_FORKNOEXEC   0x00000040      /* forked but didn't exec */
 402 #define PF_SUPERPRIV    0x00000100      /* used super-user privileges */
 403 #define PF_DUMPCORE     0x00000200      /* dumped core */
 404 #define PF_SIGNALED     0x00000400      /* killed by a signal */
 405 #define PF_MEMALLOC     0x00000800      /* Allocating memory */
 406 #define PF_VFORK        0x00001000      /* Wake up parent in mm_release */
 407
 408 #define PF_USEDFPU      0x00100000      /* task used FPU this quantum (SMP) */
 409
 410 /*
 411  * Ptrace flags
 412  */
 413
 414 #define PT_PTRACED      0x00000001
 415 #define PT_TRACESYS     0x00000002
 416 #define PT_DTRACE       0x00000004      /* delayed trace (used on m68k, i386) */
 417 #define PT_TRACESYSGOOD 0x00000008
 418
 419 /*
 420  * Limit the stack by to some sane default: root can always
 421  * increase this limit if needed..  8MB seems reasonable.
 422  */
 423 #define _STK_LIM        (8*1024*1024)
 424
 425 #define DEF_COUNTER     (10*HZ/100)     /* 100 ms time slice */
 426 #define MAX_COUNTER     (20*HZ/100)
 427 #define DEF_NICE        (0)
 428
 429 /*
 430  *  INIT_TASK is used to set up the first task table, touch at
 431  * your own risk!. Base=0, limit=0x1fffff (=2MB)
 432  */
 433 #define INIT_TASK(tsk)  \
 434 {                                                                       \
 435     state:              0,                                              \
 436     flags:              0,                                              \
 437     sigpending:         0,                                              \
 438     addr_limit:         KERNEL_DS,                                      \
 439     exec_domain:        &default_exec_domain,                           \
 440     lock_depth:         -1,                                             \
 441     counter:            DEF_COUNTER,                                    \
 442     nice:               DEF_NICE,                                       \
 443     policy:             SCHED_OTHER,                                    \
 444     mm:                 NULL,                                           \
 445     active_mm:          &init_mm,                                       \
 446     cpus_allowed:       -1,                                             \
 447     run_list:           LIST_HEAD_INIT(tsk.run_list),                   \
 448     next_task:          &tsk,                                           \
 449     prev_task:          &tsk,                                           \
 450     p_opptr:            &tsk,                                           \
 451     p_pptr:             &tsk,                                           \
 452     thread_group:       LIST_HEAD_INIT(tsk.thread_group),               \
 453     wait_chldexit:      __WAIT_QUEUE_HEAD_INITIALIZER(tsk.wait_chldexit),\
 454     real_timer:         {                                               \
 455         function:               it_real_fn                              \
 456     },                                                                  \
 457     cap_effective:      CAP_INIT_EFF_SET,                               \
 458     cap_inheritable:    CAP_INIT_INH_SET,                               \
 459     cap_permitted:      CAP_FULL_SET,                                   \
 460     keep_capabilities:  0,                                              \
 461     rlim:               INIT_RLIMITS,                                   \
 462     user:               INIT_USER,                                      \
 463     comm:               "swapper",                                      \
 464     thread:             INIT_THREAD,                                    \
 465     fs:                 &init_fs,                                       \
 466     files:              &init_files,                                    \
 467     sigmask_lock:       SPIN_LOCK_UNLOCKED,                             \
 468     sig:                &init_signals,                                  \
 469     pending:            { NULL, &tsk.pending.head, {{0}}},              \
 470     blocked:            {{0}},                                          \
 471     alloc_lock:         SPIN_LOCK_UNLOCKED                              \
 472 }
 473
 474
 475 #ifndef INIT_TASK_SIZE
 476 # define INIT_TASK_SIZE 2048*sizeof(long)
 477 #endif
 478
 479 union task_union {
 480         struct task_struct task;
 481         unsigned long stack[INIT_TASK_SIZE/sizeof(long)];
 482 };
 483
 484 extern union task_union init_task_union;
 485
 486 extern struct   mm_struct init_mm;
 487 extern struct task_struct *init_tasks[NR_CPUS];
 488
 489 /* PID hashing. (shouldnt this be dynamic?) */
 490 #define PIDHASH_SZ (4096 >> 2)
 491 extern struct task_struct *pidhash[PIDHASH_SZ];
 492
 493 #define pid_hashfn(x)   ((((x) >> 8) ^ (x)) & (PIDHASH_SZ - 1))
 494
 495 static inline void hash_pid(struct task_struct *p)
 496 {
 497         struct task_struct **htable = &pidhash[pid_hashfn(p->pid)];
 498
 499         if((p->pidhash_next = *htable) != NULL)
 500                 (*htable)->pidhash_pprev = &p->pidhash_next;
 501         *htable = p;
 502         p->pidhash_pprev = htable;
 503 }
 504
 505 static inline void unhash_pid(struct task_struct *p)
 506 {
 507         if(p->pidhash_next)
 508                 p->pidhash_next->pidhash_pprev = p->pidhash_pprev;
 509         *p->pidhash_pprev = p->pidhash_next;
 510 }
 511
 512 static inline struct task_struct *find_task_by_pid(int pid)
 513 {
 514         struct task_struct *p, **htable = &pidhash[pid_hashfn(pid)];
 515
 516         for(p = *htable; p && p->pid != pid; p = p->pidhash_next)
 517                 ;
 518
 519         return p;
 520 }
 521
 522 /* per-UID process charging. */
 523 extern struct user_struct * alloc_uid(uid_t);
 524 extern void free_uid(struct user_struct *);
 525
 526 #include <asm/current.h>
 527
 528 extern unsigned long volatile jiffies;
 529 extern unsigned long itimer_ticks;
 530 extern unsigned long itimer_next;
 531 extern struct timeval xtime;
 532 extern void do_timer(struct pt_regs *);
 533
 534 extern unsigned int * prof_buffer;
 535 extern unsigned long prof_len;
 536 extern unsigned long prof_shift;
 537
 538 #define CURRENT_TIME (xtime.tv_sec)
 539
 540 extern void FASTCALL(__wake_up(wait_queue_head_t *q, unsigned int mode, unsigned int wq_mode));
 541 extern void FASTCALL(__wake_up_sync(wait_queue_head_t *q, unsigned int mode, unsigned int wq_mode));
 542 extern void FASTCALL(sleep_on(wait_queue_head_t *q));
 543 extern long FASTCALL(sleep_on_timeout(wait_queue_head_t *q,
 544                                       signed long timeout));
 545 extern void FASTCALL(interruptible_sleep_on(wait_queue_head_t *q));
 546 extern long FASTCALL(interruptible_sleep_on_timeout(wait_queue_head_t *q,
 547                                                     signed long timeout));
 548 extern void FASTCALL(wake_up_process(struct task_struct * tsk));
 549
 550 #define wake_up(x)                      __wake_up((x),TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE,WQ_FLAG_EXCLUSIVE)
 551 #define wake_up_all(x)                  __wake_up((x),TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE,0)
 552 #define wake_up_sync(x)                 __wake_up_sync((x),TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE,WQ_FLAG_EXCLUSIVE)
 553 #define wake_up_interruptible(x)        __wake_up((x),TASK_INTERRUPTIBLE,WQ_FLAG_EXCLUSIVE)
 554 #define wake_up_interruptible_all(x)    __wake_up((x),TASK_INTERRUPTIBLE,0)
 555 #define wake_up_interruptible_sync(x)   __wake_up_sync((x),TASK_INTERRUPTIBLE,WQ_FLAG_EXCLUSIVE)
 556
 557 extern int in_group_p(gid_t);
 558 extern int in_egroup_p(gid_t);
 559
 560 extern void proc_caches_init(void);
 561 extern void flush_signals(struct task_struct *);
 562 extern void flush_signal_handlers(struct task_struct *);
 563 extern int dequeue_signal(sigset_t *, siginfo_t *);
 564 extern void block_all_signals(int (*notifier)(void *priv), void *priv,
 565                               sigset_t *mask);
 566 extern void unblock_all_signals(void);
 567 extern int send_sig_info(int, struct siginfo *, struct task_struct *);
 568 extern int force_sig_info(int, struct siginfo *, struct task_struct *);
 569 extern int kill_pg_info(int, struct siginfo *, pid_t);
 570 extern int kill_sl_info(int, struct siginfo *, pid_t);
 571 extern int kill_proc_info(int, struct siginfo *, pid_t);
 572 extern void notify_parent(struct task_struct *, int);
 573 extern void do_notify_parent(struct task_struct *, int);
 574 extern void force_sig(int, struct task_struct *);
 575 extern int send_sig(int, struct task_struct *, int);
 576 extern int kill_pg(pid_t, int, int);
 577 extern int kill_sl(pid_t, int, int);
 578 extern int kill_proc(pid_t, int, int);
 579 extern int do_sigaction(int, const struct k_sigaction *, struct k_sigaction *);
 580 extern int do_sigaltstack(const stack_t *, stack_t *, unsigned long);
 581
 582 static inline int signal_pending(struct task_struct *p)
 583 {
 584         return (p->sigpending != 0);
 585 }
 586
 587 /*
 588  * Re-calculate pending state from the set of locally pending
 589  * signals, globally pending signals, and blocked signals.
 590  */
 591 static inline int has_pending_signals(sigset_t *signal, sigset_t *blocked)
 592 {
 593         unsigned long ready;
 594         long i;
 595
 596         switch (_NSIG_WORDS) {
 597         default:
 598                 for (i = _NSIG_WORDS, ready = 0; --i >= 0 ;)
 599                         ready |= signal->sig[i] &~ blocked->sig[i];
 600                 break;
 601
 602         case 4: ready  = signal->sig[3] &~ blocked->sig[3];
 603                 ready |= signal->sig[2] &~ blocked->sig[2];
 604                 ready |= signal->sig[1] &~ blocked->sig[1];
 605                 ready |= signal->sig[0] &~ blocked->sig[0];
 606                 break;
 607
 608         case 2: ready  = signal->sig[1] &~ blocked->sig[1];
 609                 ready |= signal->sig[0] &~ blocked->sig[0];
 610                 break;
 611
 612         case 1: ready  = signal->sig[0] &~ blocked->sig[0];
 613         }
 614         return ready != 0;
 615 }
 616
 617 /* Reevaluate whether the task has signals pending delivery.
 618    This is required every time the blocked sigset_t changes.
 619    All callers should have t->sigmask_lock.  */
 620
 621 static inline void recalc_sigpending(struct task_struct *t)
 622 {
 623         t->sigpending = has_pending_signals(&t->pending.signal, &t->blocked);
 624 }
 625
 626 /* True if we are on the alternate signal stack.  */
 627
 628 static inline int on_sig_stack(unsigned long sp)
 629 {
 630         return (sp - current->sas_ss_sp < current->sas_ss_size);
 631 }
 632
 633 static inline int sas_ss_flags(unsigned long sp)
 634 {
 635         return (current->sas_ss_size == 0 ? SS_DISABLE
 636                 : on_sig_stack(sp) ? SS_ONSTACK : 0);
 637 }
 638
 639 extern int request_irq(unsigned int,
 640                        void (*handler)(int, void *, struct pt_regs *),
 641                        unsigned long, const char *, void *);
 642 extern void free_irq(unsigned int, void *);
 643
 644 /*
 645  * This has now become a routine instead of a macro, it sets a flag if
 646  * it returns true (to do BSD-style accounting where the process is flagged
 647  * if it uses root privs). The implication of this is that you should do
 648  * normal permissions checks first, and check suser() last.
 649  *
 650  * [Dec 1997 -- Chris Evans]
 651  * For correctness, the above considerations need to be extended to
 652  * fsuser(). This is done, along with moving fsuser() checks to be
 653  * last.
 654  *
 655  * These will be removed, but in the mean time, when the SECURE_NOROOT
 656  * flag is set, uids don't grant privilege.
 657  */
 658 static inline int suser(void)
 659 {
 660         if (!issecure(SECURE_NOROOT) && current->euid == 0) {
 661                 current->flags |= PF_SUPERPRIV;
 662                 return 1;
 663         }
 664         return 0;
 665 }
 666
 667 static inline int fsuser(void)
 668 {
 669         if (!issecure(SECURE_NOROOT) && current->fsuid == 0) {
 670                 current->flags |= PF_SUPERPRIV;
 671                 return 1;
 672         }
 673         return 0;
 674 }
 675
 676 /*
 677  * capable() checks for a particular capability.
 678  * New privilege checks should use this interface, rather than suser() or
 679  * fsuser(). See include/linux/capability.h for defined capabilities.
 680  */
 681
 682 static inline int capable(int cap)
 683 {
 684 #if 1 /* ok now */
 685         if (cap_raised(current->cap_effective, cap))
 686 #else
 687         if (cap_is_fs_cap(cap) ? current->fsuid == 0 : current->euid == 0)
 688 #endif
 689         {
 690                 current->flags |= PF_SUPERPRIV;
 691                 return 1;
 692         }
 693         return 0;
 694 }
 695
 696 /*
 697  * Routines for handling mm_structs
 698  */
 699 extern struct mm_struct * mm_alloc(void);
 700
 701 extern struct mm_struct * start_lazy_tlb(void);
 702 extern void end_lazy_tlb(struct mm_struct *mm);
 703
 704 /* mmdrop drops the mm and the page tables */
 705 extern inline void FASTCALL(__mmdrop(struct mm_struct *));
 706 static inline void mmdrop(struct mm_struct * mm)
 707 {
 708         if (atomic_dec_and_test(&mm->mm_count))
 709                 __mmdrop(mm);
 710 }
 711
 712 /* mmput gets rid of the mappings and all user-space */
 713 extern void mmput(struct mm_struct *);
 714 /* Remove the current tasks stale references to the old mm_struct */
 715 extern void mm_release(void);
 716
 717 /*
 718  * Routines for handling the fd arrays
 719  */
 720 extern struct file ** alloc_fd_array(int);
 721 extern int expand_fd_array(struct files_struct *, int nr);
 722 extern void free_fd_array(struct file **, int);
 723
 724 extern fd_set *alloc_fdset(int);
 725 extern int expand_fdset(struct files_struct *, int nr);
 726 extern void free_fdset(fd_set *, int);
 727
 728 extern int  copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
 729 extern void flush_thread(void);
 730 extern void exit_thread(void);
 731
 732 extern void exit_mm(struct task_struct *);
 733 extern void exit_files(struct task_struct *);
 734 extern void exit_sighand(struct task_struct *);
 735
 736 extern void daemonize(void);
 737
 738 extern int do_execve(char *, char **, char **, struct pt_regs *);
 739 extern int do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long);
 740
 741 extern void FASTCALL(add_wait_queue(wait_queue_head_t *q, wait_queue_t * wait));
 742 extern void FASTCALL(add_wait_queue_exclusive(wait_queue_head_t *q, wait_queue_t * wait));
 743 extern void FASTCALL(remove_wait_queue(wait_queue_head_t *q, wait_queue_t * wait));
 744
 745 #define __wait_event(wq, condition)                                     \
 746 do {                                                                    \
 747         wait_queue_t __wait;                                            \
 748         init_waitqueue_entry(&__wait, current);                         \
 749                                                                         \
 750         add_wait_queue(&wq, &__wait);                                   \
 751         for (;;) {                                                      \
 752                 set_current_state(TASK_UNINTERRUPTIBLE);                \
 753                 if (condition)                                          \
 754                         break;                                          \
 755                 schedule();                                             \
 756         }                                                               \
 757         current->state = TASK_RUNNING;                                  \
 758         remove_wait_queue(&wq, &__wait);                                \
 759 } while (0)
 760
 761 #define wait_event(wq, condition)                                       \
 762 do {                                                                    \
 763         if (condition)                                                  \
 764                 break;                                                  \
 765         __wait_event(wq, condition);                                    \
 766 } while (0)
 767
 768 #define __wait_event_interruptible(wq, condition, ret)                  \
 769 do {                                                                    \
 770         wait_queue_t __wait;                                            \
 771         init_waitqueue_entry(&__wait, current);                         \
 772                                                                         \
 773         add_wait_queue(&wq, &__wait);                                   \
 774         for (;;) {                                                      \
 775                 set_current_state(TASK_INTERRUPTIBLE);                  \
 776                 if (condition)                                          \
 777                         break;                                          \
 778                 if (!signal_pending(current)) {                         \
 779                         schedule();                                     \
 780                         continue;                                       \
 781                 }                                                       \
 782                 ret = -ERESTARTSYS;                                     \
 783                 break;                                                  \
 784         }                                                               \
 785         current->state = TASK_RUNNING;                                  \
 786         remove_wait_queue(&wq, &__wait);                                \
 787 } while (0)
 788
 789 #define wait_event_interruptible(wq, condition)                         \
 790 ({                                                                      \
 791         int __ret = 0;                                                  \
 792         if (!(condition))                                               \
 793                 __wait_event_interruptible(wq, condition, __ret);       \
 794         __ret;                                                          \
 795 })
 796
 797 #define REMOVE_LINKS(p) do { \
 798         (p)->next_task->prev_task = (p)->prev_task; \
 799         (p)->prev_task->next_task = (p)->next_task; \
 800         if ((p)->p_osptr) \
 801                 (p)->p_osptr->p_ysptr = (p)->p_ysptr; \
 802         if ((p)->p_ysptr) \
 803                 (p)->p_ysptr->p_osptr = (p)->p_osptr; \
 804         else \
 805                 (p)->p_pptr->p_cptr = (p)->p_osptr; \
 806         } while (0)
 807
 808 #define SET_LINKS(p) do { \
 809         (p)->next_task = &init_task; \
 810         (p)->prev_task = init_task.prev_task; \
 811         init_task.prev_task->next_task = (p); \
 812         init_task.prev_task = (p); \
 813         (p)->p_ysptr = NULL; \
 814         if (((p)->p_osptr = (p)->p_pptr->p_cptr) != NULL) \
 815                 (p)->p_osptr->p_ysptr = p; \
 816         (p)->p_pptr->p_cptr = p; \
 817         } while (0)
 818
 819 #define for_each_task(p) \
 820         for (p = &init_task ; (p = p->next_task) != &init_task ; )
 821
 822 #define next_thread(p) \
 823         list_entry((p)->thread_group.next, struct task_struct, thread_group)
 824
 825 static inline void del_from_runqueue(struct task_struct * p)
 826 {
 827         nr_running--;
 828         p->sleep_time = jiffies;
 829         list_del(&p->run_list);
 830         p->run_list.next = NULL;
 831 }
 832
 833 static inline int task_on_runqueue(struct task_struct *p)
 834 {
 835         return (p->run_list.next != NULL);
 836 }
 837
 838 static inline void unhash_process(struct task_struct *p)
 839 {
 840         if (task_on_runqueue(p)) BUG();
 841         write_lock_irq(&tasklist_lock);
 842         nr_threads--;
 843         unhash_pid(p);
 844         REMOVE_LINKS(p);
 845         list_del(&p->thread_group);
 846         write_unlock_irq(&tasklist_lock);
 847 }
 848
 849 static inline void task_lock(struct task_struct *p)
 850 {
 851         spin_lock(&p->alloc_lock);
 852 }
 853
 854 static inline void task_unlock(struct task_struct *p)
 855 {
 856         spin_unlock(&p->alloc_lock);
 857 }
 858
 859 /* write full pathname into buffer and return start of pathname */
 860 static inline char * d_path(struct dentry *dentry, struct vfsmount *vfsmnt,
 861                                 char *buf, int buflen)
 862 {
 863         char *res;
 864         struct vfsmount *rootmnt;
 865         struct dentry *root;
 866         read_lock(&current->fs->lock);
 867         rootmnt = mntget(current->fs->rootmnt);
 868         root = dget(current->fs->root);
 869         read_unlock(&current->fs->lock);
 870         spin_lock(&dcache_lock);
 871         res = __d_path(dentry, vfsmnt, root, rootmnt, buf, buflen);
 872         spin_unlock(&dcache_lock);
 873         dput(root);
 874         mntput(rootmnt);
 875         return res;
 876 }
 877
 878 #endif /* __KERNEL__ */
 879
 880 #endif