Release 4.12 include/linux/poll.h

#ifndef _LINUX_POLL_H

#define _LINUX_POLL_H


#include <linux/compiler.h>
#include <linux/ktime.h>
#include <linux/wait.h>
#include <linux/string.h>
#include <linux/fs.h>
#include <linux/sysctl.h>
#include <linux/uaccess.h>
#include <uapi/linux/poll.h>

extern struct ctl_table epoll_table[]; /* for sysctl */
/* ~832 bytes of stack space used max in sys_select/sys_poll before allocating
   additional memory. */

#define MAX_STACK_ALLOC 832

#define FRONTEND_STACK_ALLOC	256

#define SELECT_STACK_ALLOC	FRONTEND_STACK_ALLOC

#define POLL_STACK_ALLOC	FRONTEND_STACK_ALLOC

#define WQUEUES_STACK_ALLOC	(MAX_STACK_ALLOC - FRONTEND_STACK_ALLOC)

#define N_INLINE_POLL_ENTRIES	(WQUEUES_STACK_ALLOC / sizeof(struct poll_table_entry))


#define DEFAULT_POLLMASK (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)

struct poll_table_struct;

/* 
 * structures and helpers for f_op->poll implementations
 */

typedef void (*poll_queue_proc)(struct file *, wait_queue_head_t *, struct poll_table_struct *);

/*
 * Do not touch the structure directly, use the access functions
 * poll_does_not_wait() and poll_requested_events() instead.
 */

typedef struct poll_table_struct {
	
poll_queue_proc _qproc;
	
unsigned long _key;

} poll_table;



static inline void poll_wait(struct file * filp, wait_queue_head_t * wait_address, poll_table *p)
{
	if (p && p->_qproc && wait_address)
		p->_qproc(filp, wait_address, p);
}

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2
4.88%
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1
2.44%
1
12.50%
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8
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/*
 * Return true if it is guaranteed that poll will not wait. This is the case
 * if the poll() of another file descriptor in the set got an event, so there
 * is no need for waiting.
 */


static inline bool poll_does_not_wait(const poll_table *p)
{
	return p == NULL || p->_qproc == NULL;
}

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/*
 * Return the set of events that the application wants to poll for.
 * This is useful for drivers that need to know whether a DMA transfer has
 * to be started implicitly on poll(). You typically only want to do that
 * if the application is actually polling for POLLIN and/or POLLOUT.
 */


static inline unsigned long poll_requested_events(const poll_table *p)
{
	return p ? p->_key : ~0UL;
}

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static inline void init_poll_funcptr(poll_table *pt, poll_queue_proc qproc)
{
	pt->_qproc = qproc;
	pt->_key   = ~0UL; /* all events enabled */
}

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2
7.14%
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struct poll_table_entry {
	
struct file *filp;
	
unsigned long key;
	
wait_queue_t wait;
	
wait_queue_head_t *wait_address;
};

/*
 * Structures and helpers for select/poll syscall
 */

struct poll_wqueues {
	
poll_table pt;
	
struct poll_table_page *table;
	
struct task_struct *polling_task;
	
int triggered;
	
int error;
	
int inline_index;
	
struct poll_table_entry inline_entries[N_INLINE_POLL_ENTRIES];
};

extern void poll_initwait(struct poll_wqueues *pwq);
extern void poll_freewait(struct poll_wqueues *pwq);
extern int poll_schedule_timeout(struct poll_wqueues *pwq, int state,
				 ktime_t *expires, unsigned long slack);
extern u64 select_estimate_accuracy(struct timespec64 *tv);


#define MAX_INT64_SECONDS (((s64)(~((u64)0)>>1)/HZ)-1)

extern int core_sys_select(int n, fd_set __user *inp, fd_set __user *outp,
			   fd_set __user *exp, struct timespec64 *end_time);

extern int poll_select_set_timeout(struct timespec64 *to, time64_t sec,
				   long nsec);

#endif /* _LINUX_POLL_H */
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58
15.30%
1
2.94%
Andi Kleen
52
13.72%
1
2.94%
Davide Libenzi
51
13.46%
3
8.82%
Tejun Heo
29
7.65%
1
2.94%
Manfred Spraul
26
6.86%
1
2.94%
Al Viro
25
6.60%
2
5.88%
Eric Dumazet
14
3.69%
1
2.94%
Thomas Gleixner
14
3.69%
1
2.94%
Dave Young
10
2.64%
1
2.94%
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2.11%
2
5.88%
Shawn Bohrer
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2.11%
1
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4
1.06%
1
2.94%
Deepa Dinamani
4
1.06%
1
2.94%
David Howells
3
0.79%
1
2.94%
Andrew Morton
3
0.79%
1
2.94%
Arjan van de Ven
2
0.53%
1
2.94%
Linus Torvalds
2
0.53%
2
5.88%
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1
0.26%
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2.94%
John Stultz
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0.26%
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2.94%
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Directory: include/linux

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