sched.h
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:27k
- #ifndef _LINUX_SCHED_H
- #define _LINUX_SCHED_H
- #include <asm/param.h> /* for HZ */
- extern unsigned long event;
- #include <linux/config.h>
- #include <linux/binfmts.h>
- #include <linux/threads.h>
- #include <linux/kernel.h>
- #include <linux/types.h>
- #include <linux/times.h>
- #include <linux/timex.h>
- #include <linux/rbtree.h>
- #include <asm/system.h>
- #include <asm/semaphore.h>
- #include <asm/page.h>
- #include <asm/ptrace.h>
- #include <asm/mmu.h>
- #include <linux/smp.h>
- #include <linux/tty.h>
- #include <linux/sem.h>
- #include <linux/signal.h>
- #include <linux/securebits.h>
- #include <linux/fs_struct.h>
- struct exec_domain;
- /*
- * cloning flags:
- */
- #define CSIGNAL 0x000000ff /* signal mask to be sent at exit */
- #define CLONE_VM 0x00000100 /* set if VM shared between processes */
- #define CLONE_FS 0x00000200 /* set if fs info shared between processes */
- #define CLONE_FILES 0x00000400 /* set if open files shared between processes */
- #define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */
- #define CLONE_PID 0x00001000 /* set if pid shared */
- #define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */
- #define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */
- #define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */
- #define CLONE_THREAD 0x00010000 /* Same thread group? */
- #define CLONE_NEWNS 0x00020000 /* New namespace group? */
- #define CLONE_SIGNAL (CLONE_SIGHAND | CLONE_THREAD)
- /*
- * These are the constant used to fake the fixed-point load-average
- * counting. Some notes:
- * - 11 bit fractions expand to 22 bits by the multiplies: this gives
- * a load-average precision of 10 bits integer + 11 bits fractional
- * - if you want to count load-averages more often, you need more
- * precision, or rounding will get you. With 2-second counting freq,
- * the EXP_n values would be 1981, 2034 and 2043 if still using only
- * 11 bit fractions.
- */
- extern unsigned long avenrun[]; /* Load averages */
- #define FSHIFT 11 /* nr of bits of precision */
- #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
- #define LOAD_FREQ (5*HZ) /* 5 sec intervals */
- #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
- #define EXP_5 2014 /* 1/exp(5sec/5min) */
- #define EXP_15 2037 /* 1/exp(5sec/15min) */
- #define CALC_LOAD(load,exp,n)
- load *= exp;
- load += n*(FIXED_1-exp);
- load >>= FSHIFT;
- #define CT_TO_SECS(x) ((x) / HZ)
- #define CT_TO_USECS(x) (((x) % HZ) * 1000000/HZ)
- extern int nr_running, nr_threads;
- extern int last_pid;
- #include <linux/fs.h>
- #include <linux/time.h>
- #include <linux/param.h>
- #include <linux/resource.h>
- #ifdef __KERNEL__
- #include <linux/timer.h>
- #endif
- #include <asm/processor.h>
- #define TASK_RUNNING 0
- #define TASK_INTERRUPTIBLE 1
- #define TASK_UNINTERRUPTIBLE 2
- #define TASK_ZOMBIE 4
- #define TASK_STOPPED 8
- #define __set_task_state(tsk, state_value)
- do { (tsk)->state = (state_value); } while (0)
- #ifdef CONFIG_SMP
- #define set_task_state(tsk, state_value)
- set_mb((tsk)->state, (state_value))
- #else
- #define set_task_state(tsk, state_value)
- __set_task_state((tsk), (state_value))
- #endif
- #define __set_current_state(state_value)
- do { current->state = (state_value); } while (0)
- #ifdef CONFIG_SMP
- #define set_current_state(state_value)
- set_mb(current->state, (state_value))
- #else
- #define set_current_state(state_value)
- __set_current_state(state_value)
- #endif
- /*
- * Scheduling policies
- */
- #define SCHED_OTHER 0
- #define SCHED_FIFO 1
- #define SCHED_RR 2
- /*
- * This is an additional bit set when we want to
- * yield the CPU for one re-schedule..
- */
- #define SCHED_YIELD 0x10
- struct sched_param {
- int sched_priority;
- };
- struct completion;
- #ifdef __KERNEL__
- #include <linux/spinlock.h>
- /*
- * This serializes "schedule()" and also protects
- * the run-queue from deletions/modifications (but
- * _adding_ to the beginning of the run-queue has
- * a separate lock).
- */
- extern rwlock_t tasklist_lock;
- extern spinlock_t runqueue_lock;
- extern spinlock_t mmlist_lock;
- extern void sched_init(void);
- extern void init_idle(void);
- extern void show_state(void);
- extern void cpu_init (void);
- extern void trap_init(void);
- extern void update_process_times(int user);
- extern void update_one_process(struct task_struct *p, unsigned long user,
- unsigned long system, int cpu);
- #define MAX_SCHEDULE_TIMEOUT LONG_MAX
- extern signed long FASTCALL(schedule_timeout(signed long timeout));
- asmlinkage void schedule(void);
- extern int schedule_task(struct tq_struct *task);
- extern void flush_scheduled_tasks(void);
- extern int start_context_thread(void);
- extern int current_is_keventd(void);
- /*
- * The default fd array needs to be at least BITS_PER_LONG,
- * as this is the granularity returned by copy_fdset().
- */
- #define NR_OPEN_DEFAULT BITS_PER_LONG
- struct namespace;
- /*
- * Open file table structure
- */
- struct files_struct {
- atomic_t count;
- rwlock_t file_lock; /* Protects all the below members. Nests inside tsk->alloc_lock */
- int max_fds;
- int max_fdset;
- int next_fd;
- struct file ** fd; /* current fd array */
- fd_set *close_on_exec;
- fd_set *open_fds;
- fd_set close_on_exec_init;
- fd_set open_fds_init;
- struct file * fd_array[NR_OPEN_DEFAULT];
- };
- #define INIT_FILES
- {
- count: ATOMIC_INIT(1),
- file_lock: RW_LOCK_UNLOCKED,
- max_fds: NR_OPEN_DEFAULT,
- max_fdset: __FD_SETSIZE,
- next_fd: 0,
- fd: &init_files.fd_array[0],
- close_on_exec: &init_files.close_on_exec_init,
- open_fds: &init_files.open_fds_init,
- close_on_exec_init: { { 0, } },
- open_fds_init: { { 0, } },
- fd_array: { NULL, }
- }
- /* Maximum number of active map areas.. This is a random (large) number */
- #define DEFAULT_MAX_MAP_COUNT (65536)
- extern int max_map_count;
- struct mm_struct {
- struct vm_area_struct * mmap; /* list of VMAs */
- rb_root_t mm_rb;
- struct vm_area_struct * mmap_cache; /* last find_vma result */
- pgd_t * pgd;
- atomic_t mm_users; /* How many users with user space? */
- atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */
- int map_count; /* number of VMAs */
- struct rw_semaphore mmap_sem;
- spinlock_t page_table_lock; /* Protects task page tables and mm->rss */
- struct list_head mmlist; /* List of all active mm's. These are globally strung
- * together off init_mm.mmlist, and are protected
- * by mmlist_lock
- */
- unsigned long start_code, end_code, start_data, end_data;
- unsigned long start_brk, brk, start_stack;
- unsigned long arg_start, arg_end, env_start, env_end;
- unsigned long rss, total_vm, locked_vm;
- unsigned long def_flags;
- unsigned long cpu_vm_mask;
- unsigned long swap_address;
- unsigned dumpable:1;
- /* Architecture-specific MM context */
- mm_context_t context;
- };
- extern int mmlist_nr;
- #define INIT_MM(name)
- {
- mm_rb: RB_ROOT,
- pgd: swapper_pg_dir,
- mm_users: ATOMIC_INIT(2),
- mm_count: ATOMIC_INIT(1),
- mmap_sem: __RWSEM_INITIALIZER(name.mmap_sem),
- page_table_lock: SPIN_LOCK_UNLOCKED,
- mmlist: LIST_HEAD_INIT(name.mmlist),
- }
- struct signal_struct {
- atomic_t count;
- struct k_sigaction action[_NSIG];
- spinlock_t siglock;
- };
- #define INIT_SIGNALS {
- count: ATOMIC_INIT(1),
- action: { {{0,}}, },
- siglock: SPIN_LOCK_UNLOCKED
- }
- /*
- * Some day this will be a full-fledged user tracking system..
- */
- struct user_struct {
- atomic_t __count; /* reference count */
- atomic_t processes; /* How many processes does this user have? */
- atomic_t files; /* How many open files does this user have? */
- /* Hash table maintenance information */
- struct user_struct *next, **pprev;
- uid_t uid;
- };
- #define get_current_user() ({
- struct user_struct *__user = current->user;
- atomic_inc(&__user->__count);
- __user; })
- extern struct user_struct root_user;
- #define INIT_USER (&root_user)
- struct task_struct {
- /*
- * offsets of these are hardcoded elsewhere - touch with care
- */
- volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
- unsigned long flags; /* per process flags, defined below */
- int sigpending;
- mm_segment_t addr_limit; /* thread address space:
- 0-0xBFFFFFFF for user-thead
- 0-0xFFFFFFFF for kernel-thread
- */
- struct exec_domain *exec_domain;
- volatile long need_resched;
- unsigned long ptrace;
- int lock_depth; /* Lock depth */
- /*
- * offset 32 begins here on 32-bit platforms. We keep
- * all fields in a single cacheline that are needed for
- * the goodness() loop in schedule().
- */
- long counter;
- long nice;
- unsigned long policy;
- struct mm_struct *mm;
- int processor;
- /*
- * cpus_runnable is ~0 if the process is not running on any
- * CPU. It's (1 << cpu) if it's running on a CPU. This mask
- * is updated under the runqueue lock.
- *
- * To determine whether a process might run on a CPU, this
- * mask is AND-ed with cpus_allowed.
- */
- unsigned long cpus_runnable, cpus_allowed;
- /*
- * (only the 'next' pointer fits into the cacheline, but
- * that's just fine.)
- */
- struct list_head run_list;
- unsigned long sleep_time;
- struct task_struct *next_task, *prev_task;
- struct mm_struct *active_mm;
- struct list_head local_pages;
- unsigned int allocation_order, nr_local_pages;
- /* task state */
- struct linux_binfmt *binfmt;
- int exit_code, exit_signal;
- int pdeath_signal; /* The signal sent when the parent dies */
- /* ??? */
- unsigned long personality;
- int did_exec:1;
- pid_t pid;
- pid_t pgrp;
- pid_t tty_old_pgrp;
- pid_t session;
- pid_t tgid;
- /* boolean value for session group leader */
- int leader;
- /*
- * 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 list_head thread_group;
- /* PID hash table linkage. */
- struct task_struct *pidhash_next;
- struct task_struct **pidhash_pprev;
- wait_queue_head_t wait_chldexit; /* for wait4() */
- struct completion *vfork_done; /* for vfork() */
- unsigned long 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;
- struct tms times;
- unsigned long start_time;
- long per_cpu_utime[NR_CPUS], per_cpu_stime[NR_CPUS];
- /* 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;
- /* process credentials */
- uid_t uid,euid,suid,fsuid;
- gid_t gid,egid,sgid,fsgid;
- int ngroups;
- gid_t groups[NGROUPS];
- kernel_cap_t cap_effective, cap_inheritable, cap_permitted;
- int keep_capabilities:1;
- struct user_struct *user;
- /* limits */
- struct rlimit rlim[RLIM_NLIMITS];
- unsigned short used_math;
- char comm[16];
- /* file system info */
- int link_count, total_link_count;
- struct tty_struct *tty; /* NULL if no tty */
- unsigned int locks; /* How many file locks are being held */
- /* ipc stuff */
- struct sem_undo *semundo;
- struct sem_queue *semsleeping;
- /* CPU-specific state of this task */
- struct thread_struct thread;
- /* filesystem information */
- struct fs_struct *fs;
- /* open file information */
- struct files_struct *files;
- /* namespace */
- struct namespace *namespace;
- /* signal handlers */
- spinlock_t sigmask_lock; /* Protects signal and blocked */
- struct signal_struct *sig;
- sigset_t blocked;
- struct sigpending pending;
- unsigned long sas_ss_sp;
- size_t sas_ss_size;
- int (*notifier)(void *priv);
- void *notifier_data;
- sigset_t *notifier_mask;
-
- /* Thread group tracking */
- u32 parent_exec_id;
- u32 self_exec_id;
- /* Protection of (de-)allocation: mm, files, fs, tty */
- spinlock_t alloc_lock;
- /* journalling filesystem info */
- void *journal_info;
- };
- /*
- * Per process flags
- */
- #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
- /* Not implemented yet, only for 486*/
- #define PF_STARTING 0x00000002 /* being created */
- #define PF_EXITING 0x00000004 /* getting shut down */
- #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
- #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
- #define PF_DUMPCORE 0x00000200 /* dumped core */
- #define PF_SIGNALED 0x00000400 /* killed by a signal */
- #define PF_MEMALLOC 0x00000800 /* Allocating memory */
- #define PF_MEMDIE 0x00001000 /* Killed for out-of-memory */
- #define PF_FREE_PAGES 0x00002000 /* per process page freeing */
- #define PF_NOIO 0x00004000 /* avoid generating further I/O */
- #define PF_USEDFPU 0x00100000 /* task used FPU this quantum (SMP) */
- /*
- * Ptrace flags
- */
- #define PT_PTRACED 0x00000001
- #define PT_TRACESYS 0x00000002
- #define PT_DTRACE 0x00000004 /* delayed trace (used on m68k, i386) */
- #define PT_TRACESYSGOOD 0x00000008
- #define PT_PTRACE_CAP 0x00000010 /* ptracer can follow suid-exec */
- /*
- * Limit the stack by to some sane default: root can always
- * increase this limit if needed.. 8MB seems reasonable.
- */
- #define _STK_LIM (8*1024*1024)
- #define DEF_COUNTER (10*HZ/100) /* 100 ms time slice */
- #define MAX_COUNTER (20*HZ/100)
- #define DEF_NICE (0)
- extern void yield(void);
- /*
- * The default (Linux) execution domain.
- */
- extern struct exec_domain default_exec_domain;
- /*
- * INIT_TASK is used to set up the first task table, touch at
- * your own risk!. Base=0, limit=0x1fffff (=2MB)
- */
- #define INIT_TASK(tsk)
- {
- state: 0,
- flags: 0,
- sigpending: 0,
- addr_limit: KERNEL_DS,
- exec_domain: &default_exec_domain,
- lock_depth: -1,
- counter: DEF_COUNTER,
- nice: DEF_NICE,
- policy: SCHED_OTHER,
- mm: NULL,
- active_mm: &init_mm,
- cpus_runnable: -1,
- cpus_allowed: -1,
- run_list: LIST_HEAD_INIT(tsk.run_list),
- next_task: &tsk,
- prev_task: &tsk,
- p_opptr: &tsk,
- p_pptr: &tsk,
- thread_group: LIST_HEAD_INIT(tsk.thread_group),
- wait_chldexit: __WAIT_QUEUE_HEAD_INITIALIZER(tsk.wait_chldexit),
- real_timer: {
- function: it_real_fn
- },
- cap_effective: CAP_INIT_EFF_SET,
- cap_inheritable: CAP_INIT_INH_SET,
- cap_permitted: CAP_FULL_SET,
- keep_capabilities: 0,
- rlim: INIT_RLIMITS,
- user: INIT_USER,
- comm: "swapper",
- thread: INIT_THREAD,
- fs: &init_fs,
- files: &init_files,
- sigmask_lock: SPIN_LOCK_UNLOCKED,
- sig: &init_signals,
- pending: { NULL, &tsk.pending.head, {{0}}},
- blocked: {{0}},
- alloc_lock: SPIN_LOCK_UNLOCKED,
- journal_info: NULL,
- }
- #ifndef INIT_TASK_SIZE
- # define INIT_TASK_SIZE 2048*sizeof(long)
- #endif
- union task_union {
- struct task_struct task;
- unsigned long stack[INIT_TASK_SIZE/sizeof(long)];
- };
- extern union task_union init_task_union;
- extern struct mm_struct init_mm;
- extern struct task_struct *init_tasks[NR_CPUS];
- /* PID hashing. (shouldnt this be dynamic?) */
- #define PIDHASH_SZ (4096 >> 2)
- extern struct task_struct *pidhash[PIDHASH_SZ];
- #define pid_hashfn(x) ((((x) >> 8) ^ (x)) & (PIDHASH_SZ - 1))
- static inline void hash_pid(struct task_struct *p)
- {
- struct task_struct **htable = &pidhash[pid_hashfn(p->pid)];
- if((p->pidhash_next = *htable) != NULL)
- (*htable)->pidhash_pprev = &p->pidhash_next;
- *htable = p;
- p->pidhash_pprev = htable;
- }
- static inline void unhash_pid(struct task_struct *p)
- {
- if(p->pidhash_next)
- p->pidhash_next->pidhash_pprev = p->pidhash_pprev;
- *p->pidhash_pprev = p->pidhash_next;
- }
- static inline struct task_struct *find_task_by_pid(int pid)
- {
- struct task_struct *p, **htable = &pidhash[pid_hashfn(pid)];
- for(p = *htable; p && p->pid != pid; p = p->pidhash_next)
- ;
- return p;
- }
- #define task_has_cpu(tsk) ((tsk)->cpus_runnable != ~0UL)
- static inline void task_set_cpu(struct task_struct *tsk, unsigned int cpu)
- {
- tsk->processor = cpu;
- tsk->cpus_runnable = 1UL << cpu;
- }
- static inline void task_release_cpu(struct task_struct *tsk)
- {
- tsk->cpus_runnable = ~0UL;
- }
- /* per-UID process charging. */
- extern struct user_struct * alloc_uid(uid_t);
- extern void free_uid(struct user_struct *);
- #include <asm/current.h>
- extern unsigned long volatile jiffies;
- extern unsigned long itimer_ticks;
- extern unsigned long itimer_next;
- extern struct timeval xtime;
- extern void do_timer(struct pt_regs *);
- extern unsigned int * prof_buffer;
- extern unsigned long prof_len;
- extern unsigned long prof_shift;
- #define CURRENT_TIME (xtime.tv_sec)
- extern void FASTCALL(__wake_up(wait_queue_head_t *q, unsigned int mode, int nr));
- extern void FASTCALL(__wake_up_sync(wait_queue_head_t *q, unsigned int mode, int nr));
- extern void FASTCALL(sleep_on(wait_queue_head_t *q));
- extern long FASTCALL(sleep_on_timeout(wait_queue_head_t *q,
- signed long timeout));
- extern void FASTCALL(interruptible_sleep_on(wait_queue_head_t *q));
- extern long FASTCALL(interruptible_sleep_on_timeout(wait_queue_head_t *q,
- signed long timeout));
- extern int FASTCALL(wake_up_process(struct task_struct * tsk));
- #define wake_up(x) __wake_up((x),TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE, 1)
- #define wake_up_nr(x, nr) __wake_up((x),TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE, nr)
- #define wake_up_all(x) __wake_up((x),TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE, 0)
- #define wake_up_sync(x) __wake_up_sync((x),TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE, 1)
- #define wake_up_sync_nr(x, nr) __wake_up_sync((x),TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE, nr)
- #define wake_up_interruptible(x) __wake_up((x),TASK_INTERRUPTIBLE, 1)
- #define wake_up_interruptible_nr(x, nr) __wake_up((x),TASK_INTERRUPTIBLE, nr)
- #define wake_up_interruptible_all(x) __wake_up((x),TASK_INTERRUPTIBLE, 0)
- #define wake_up_interruptible_sync(x) __wake_up_sync((x),TASK_INTERRUPTIBLE, 1)
- #define wake_up_interruptible_sync_nr(x, nr) __wake_up_sync((x),TASK_INTERRUPTIBLE, nr)
- asmlinkage long sys_wait4(pid_t pid,unsigned int * stat_addr, int options, struct rusage * ru);
- extern int in_group_p(gid_t);
- extern int in_egroup_p(gid_t);
- extern void proc_caches_init(void);
- extern void flush_signals(struct task_struct *);
- extern void flush_signal_handlers(struct task_struct *);
- extern void sig_exit(int, int, struct siginfo *);
- extern int dequeue_signal(sigset_t *, siginfo_t *);
- extern void block_all_signals(int (*notifier)(void *priv), void *priv,
- sigset_t *mask);
- extern void unblock_all_signals(void);
- extern int send_sig_info(int, struct siginfo *, struct task_struct *);
- extern int force_sig_info(int, struct siginfo *, struct task_struct *);
- extern int kill_pg_info(int, struct siginfo *, pid_t);
- extern int kill_sl_info(int, struct siginfo *, pid_t);
- extern int kill_proc_info(int, struct siginfo *, pid_t);
- extern void notify_parent(struct task_struct *, int);
- extern void do_notify_parent(struct task_struct *, int);
- extern void force_sig(int, struct task_struct *);
- extern int send_sig(int, struct task_struct *, int);
- extern int kill_pg(pid_t, int, int);
- extern int kill_sl(pid_t, int, int);
- extern int kill_proc(pid_t, int, int);
- extern int do_sigaction(int, const struct k_sigaction *, struct k_sigaction *);
- extern int do_sigaltstack(const stack_t *, stack_t *, unsigned long);
- static inline int signal_pending(struct task_struct *p)
- {
- return (p->sigpending != 0);
- }
- /*
- * Re-calculate pending state from the set of locally pending
- * signals, globally pending signals, and blocked signals.
- */
- static inline int has_pending_signals(sigset_t *signal, sigset_t *blocked)
- {
- unsigned long ready;
- long i;
- switch (_NSIG_WORDS) {
- default:
- for (i = _NSIG_WORDS, ready = 0; --i >= 0 ;)
- ready |= signal->sig[i] &~ blocked->sig[i];
- break;
- case 4: ready = signal->sig[3] &~ blocked->sig[3];
- ready |= signal->sig[2] &~ blocked->sig[2];
- ready |= signal->sig[1] &~ blocked->sig[1];
- ready |= signal->sig[0] &~ blocked->sig[0];
- break;
- case 2: ready = signal->sig[1] &~ blocked->sig[1];
- ready |= signal->sig[0] &~ blocked->sig[0];
- break;
- case 1: ready = signal->sig[0] &~ blocked->sig[0];
- }
- return ready != 0;
- }
- /* Reevaluate whether the task has signals pending delivery.
- This is required every time the blocked sigset_t changes.
- All callers should have t->sigmask_lock. */
- static inline void recalc_sigpending(struct task_struct *t)
- {
- t->sigpending = has_pending_signals(&t->pending.signal, &t->blocked);
- }
- /* True if we are on the alternate signal stack. */
- static inline int on_sig_stack(unsigned long sp)
- {
- return (sp - current->sas_ss_sp < current->sas_ss_size);
- }
- static inline int sas_ss_flags(unsigned long sp)
- {
- return (current->sas_ss_size == 0 ? SS_DISABLE
- : on_sig_stack(sp) ? SS_ONSTACK : 0);
- }
- extern int request_irq(unsigned int,
- void (*handler)(int, void *, struct pt_regs *),
- unsigned long, const char *, void *);
- extern void free_irq(unsigned int, void *);
- /*
- * This has now become a routine instead of a macro, it sets a flag if
- * it returns true (to do BSD-style accounting where the process is flagged
- * if it uses root privs). The implication of this is that you should do
- * normal permissions checks first, and check suser() last.
- *
- * [Dec 1997 -- Chris Evans]
- * For correctness, the above considerations need to be extended to
- * fsuser(). This is done, along with moving fsuser() checks to be
- * last.
- *
- * These will be removed, but in the mean time, when the SECURE_NOROOT
- * flag is set, uids don't grant privilege.
- */
- static inline int suser(void)
- {
- if (!issecure(SECURE_NOROOT) && current->euid == 0) {
- current->flags |= PF_SUPERPRIV;
- return 1;
- }
- return 0;
- }
- static inline int fsuser(void)
- {
- if (!issecure(SECURE_NOROOT) && current->fsuid == 0) {
- current->flags |= PF_SUPERPRIV;
- return 1;
- }
- return 0;
- }
- /*
- * capable() checks for a particular capability.
- * New privilege checks should use this interface, rather than suser() or
- * fsuser(). See include/linux/capability.h for defined capabilities.
- */
- static inline int capable(int cap)
- {
- #if 1 /* ok now */
- if (cap_raised(current->cap_effective, cap))
- #else
- if (cap_is_fs_cap(cap) ? current->fsuid == 0 : current->euid == 0)
- #endif
- {
- current->flags |= PF_SUPERPRIV;
- return 1;
- }
- return 0;
- }
- /*
- * Routines for handling mm_structs
- */
- extern struct mm_struct * mm_alloc(void);
- extern struct mm_struct * start_lazy_tlb(void);
- extern void end_lazy_tlb(struct mm_struct *mm);
- /* mmdrop drops the mm and the page tables */
- extern inline void FASTCALL(__mmdrop(struct mm_struct *));
- static inline void mmdrop(struct mm_struct * mm)
- {
- if (atomic_dec_and_test(&mm->mm_count))
- __mmdrop(mm);
- }
- /* mmput gets rid of the mappings and all user-space */
- extern void mmput(struct mm_struct *);
- /* Remove the current tasks stale references to the old mm_struct */
- extern void mm_release(void);
- /*
- * Routines for handling the fd arrays
- */
- extern struct file ** alloc_fd_array(int);
- extern int expand_fd_array(struct files_struct *, int nr);
- extern void free_fd_array(struct file **, int);
- extern fd_set *alloc_fdset(int);
- extern int expand_fdset(struct files_struct *, int nr);
- extern void free_fdset(fd_set *, int);
- extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
- extern void flush_thread(void);
- extern void exit_thread(void);
- extern void exit_mm(struct task_struct *);
- extern void exit_files(struct task_struct *);
- extern void exit_sighand(struct task_struct *);
- extern void reparent_to_init(void);
- extern void daemonize(void);
- extern int do_execve(char *, char **, char **, struct pt_regs *);
- extern int do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long);
- extern void FASTCALL(add_wait_queue(wait_queue_head_t *q, wait_queue_t * wait));
- extern void FASTCALL(add_wait_queue_exclusive(wait_queue_head_t *q, wait_queue_t * wait));
- extern void FASTCALL(remove_wait_queue(wait_queue_head_t *q, wait_queue_t * wait));
- #define __wait_event(wq, condition)
- do {
- wait_queue_t __wait;
- init_waitqueue_entry(&__wait, current);
-
- add_wait_queue(&wq, &__wait);
- for (;;) {
- set_current_state(TASK_UNINTERRUPTIBLE);
- if (condition)
- break;
- schedule();
- }
- current->state = TASK_RUNNING;
- remove_wait_queue(&wq, &__wait);
- } while (0)
- #define wait_event(wq, condition)
- do {
- if (condition)
- break;
- __wait_event(wq, condition);
- } while (0)
- #define __wait_event_interruptible(wq, condition, ret)
- do {
- wait_queue_t __wait;
- init_waitqueue_entry(&__wait, current);
-
- add_wait_queue(&wq, &__wait);
- for (;;) {
- set_current_state(TASK_INTERRUPTIBLE);
- if (condition)
- break;
- if (!signal_pending(current)) {
- schedule();
- continue;
- }
- ret = -ERESTARTSYS;
- break;
- }
- current->state = TASK_RUNNING;
- remove_wait_queue(&wq, &__wait);
- } while (0)
-
- #define wait_event_interruptible(wq, condition)
- ({
- int __ret = 0;
- if (!(condition))
- __wait_event_interruptible(wq, condition, __ret);
- __ret;
- })
- #define REMOVE_LINKS(p) do {
- (p)->next_task->prev_task = (p)->prev_task;
- (p)->prev_task->next_task = (p)->next_task;
- if ((p)->p_osptr)
- (p)->p_osptr->p_ysptr = (p)->p_ysptr;
- if ((p)->p_ysptr)
- (p)->p_ysptr->p_osptr = (p)->p_osptr;
- else
- (p)->p_pptr->p_cptr = (p)->p_osptr;
- } while (0)
- #define SET_LINKS(p) do {
- (p)->next_task = &init_task;
- (p)->prev_task = init_task.prev_task;
- init_task.prev_task->next_task = (p);
- init_task.prev_task = (p);
- (p)->p_ysptr = NULL;
- if (((p)->p_osptr = (p)->p_pptr->p_cptr) != NULL)
- (p)->p_osptr->p_ysptr = p;
- (p)->p_pptr->p_cptr = p;
- } while (0)
- #define for_each_task(p)
- for (p = &init_task ; (p = p->next_task) != &init_task ; )
- #define for_each_thread(task)
- for (task = next_thread(current) ; task != current ; task = next_thread(task))
- #define next_thread(p)
- list_entry((p)->thread_group.next, struct task_struct, thread_group)
- #define thread_group_leader(p) (p->pid == p->tgid)
- static inline void del_from_runqueue(struct task_struct * p)
- {
- nr_running--;
- p->sleep_time = jiffies;
- list_del(&p->run_list);
- p->run_list.next = NULL;
- }
- static inline int task_on_runqueue(struct task_struct *p)
- {
- return (p->run_list.next != NULL);
- }
- static inline void unhash_process(struct task_struct *p)
- {
- if (task_on_runqueue(p))
- out_of_line_bug();
- write_lock_irq(&tasklist_lock);
- nr_threads--;
- unhash_pid(p);
- REMOVE_LINKS(p);
- list_del(&p->thread_group);
- write_unlock_irq(&tasklist_lock);
- }
- /* Protects ->fs, ->files, ->mm, and synchronises with wait4(). Nests inside tasklist_lock */
- static inline void task_lock(struct task_struct *p)
- {
- spin_lock(&p->alloc_lock);
- }
- static inline void task_unlock(struct task_struct *p)
- {
- spin_unlock(&p->alloc_lock);
- }
- /* write full pathname into buffer and return start of pathname */
- static inline char * d_path(struct dentry *dentry, struct vfsmount *vfsmnt,
- char *buf, int buflen)
- {
- char *res;
- struct vfsmount *rootmnt;
- struct dentry *root;
- read_lock(¤t->fs->lock);
- rootmnt = mntget(current->fs->rootmnt);
- root = dget(current->fs->root);
- read_unlock(¤t->fs->lock);
- spin_lock(&dcache_lock);
- res = __d_path(dentry, vfsmnt, root, rootmnt, buf, buflen);
- spin_unlock(&dcache_lock);
- dput(root);
- mntput(rootmnt);
- return res;
- }
- static inline int need_resched(void)
- {
- return (unlikely(current->need_resched));
- }
- extern void __cond_resched(void);
- static inline void cond_resched(void)
- {
- if (need_resched())
- __cond_resched();
- }
- #endif /* __KERNEL__ */
- #endif