![Deepa Dinamani](/assets/img/avatar_default.png)
struct timespec is not y2038 safe. Even though timespec might be sufficient to represent timeouts, use struct timespec64 here as the plan is to get rid of all timespec reference in the kernel. The patch transitions the common functions: poll_select_set_timeout() and select_estimate_accuracy() to use timespec64. And, all the syscalls that use these functions are transitioned in the same patch. The restart block parameters for poll uses monotonic time. Use timespec64 here as well to assign timeout value. This parameter in the restart block need not change because this only holds the monotonic timestamp at which timeout should occur. And, unsigned long data type should be big enough for this timestamp. The system call interfaces will be handled in a separate series. Compat interfaces need not change as timespec64 is an alias to struct timespec on a 64 bit system. Link: http://lkml.kernel.org/r/1461947989-21926-3-git-send-email-deepa.kernel@gmail.com Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com> Acked-by: John Stultz <john.stultz@linaro.org> Acked-by: David S. Miller <davem@davemloft.net> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
166 lines
4.5 KiB
C
166 lines
4.5 KiB
C
#ifndef _LINUX_POLL_H
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#define _LINUX_POLL_H
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#include <linux/compiler.h>
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#include <linux/ktime.h>
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#include <linux/wait.h>
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#include <linux/string.h>
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#include <linux/fs.h>
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#include <linux/sysctl.h>
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#include <asm/uaccess.h>
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#include <uapi/linux/poll.h>
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extern struct ctl_table epoll_table[]; /* for sysctl */
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/* ~832 bytes of stack space used max in sys_select/sys_poll before allocating
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additional memory. */
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#define MAX_STACK_ALLOC 832
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#define FRONTEND_STACK_ALLOC 256
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#define SELECT_STACK_ALLOC FRONTEND_STACK_ALLOC
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#define POLL_STACK_ALLOC FRONTEND_STACK_ALLOC
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#define WQUEUES_STACK_ALLOC (MAX_STACK_ALLOC - FRONTEND_STACK_ALLOC)
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#define N_INLINE_POLL_ENTRIES (WQUEUES_STACK_ALLOC / sizeof(struct poll_table_entry))
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#define DEFAULT_POLLMASK (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)
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struct poll_table_struct;
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/*
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* structures and helpers for f_op->poll implementations
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*/
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typedef void (*poll_queue_proc)(struct file *, wait_queue_head_t *, struct poll_table_struct *);
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/*
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* Do not touch the structure directly, use the access functions
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* poll_does_not_wait() and poll_requested_events() instead.
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*/
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typedef struct poll_table_struct {
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poll_queue_proc _qproc;
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unsigned long _key;
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} poll_table;
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static inline void poll_wait(struct file * filp, wait_queue_head_t * wait_address, poll_table *p)
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{
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if (p && p->_qproc && wait_address)
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p->_qproc(filp, wait_address, p);
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}
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/*
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* Return true if it is guaranteed that poll will not wait. This is the case
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* if the poll() of another file descriptor in the set got an event, so there
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* is no need for waiting.
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*/
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static inline bool poll_does_not_wait(const poll_table *p)
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{
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return p == NULL || p->_qproc == NULL;
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}
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/*
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* Return the set of events that the application wants to poll for.
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* This is useful for drivers that need to know whether a DMA transfer has
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* to be started implicitly on poll(). You typically only want to do that
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* if the application is actually polling for POLLIN and/or POLLOUT.
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*/
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static inline unsigned long poll_requested_events(const poll_table *p)
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{
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return p ? p->_key : ~0UL;
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}
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static inline void init_poll_funcptr(poll_table *pt, poll_queue_proc qproc)
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{
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pt->_qproc = qproc;
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pt->_key = ~0UL; /* all events enabled */
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}
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struct poll_table_entry {
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struct file *filp;
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unsigned long key;
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wait_queue_t wait;
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wait_queue_head_t *wait_address;
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};
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/*
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* Structures and helpers for select/poll syscall
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*/
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struct poll_wqueues {
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poll_table pt;
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struct poll_table_page *table;
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struct task_struct *polling_task;
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int triggered;
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int error;
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int inline_index;
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struct poll_table_entry inline_entries[N_INLINE_POLL_ENTRIES];
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};
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extern void poll_initwait(struct poll_wqueues *pwq);
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extern void poll_freewait(struct poll_wqueues *pwq);
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extern int poll_schedule_timeout(struct poll_wqueues *pwq, int state,
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ktime_t *expires, unsigned long slack);
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extern u64 select_estimate_accuracy(struct timespec64 *tv);
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static inline int poll_schedule(struct poll_wqueues *pwq, int state)
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{
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return poll_schedule_timeout(pwq, state, NULL, 0);
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}
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/*
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* Scalable version of the fd_set.
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*/
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typedef struct {
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unsigned long *in, *out, *ex;
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unsigned long *res_in, *res_out, *res_ex;
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} fd_set_bits;
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/*
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* How many longwords for "nr" bits?
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*/
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#define FDS_BITPERLONG (8*sizeof(long))
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#define FDS_LONGS(nr) (((nr)+FDS_BITPERLONG-1)/FDS_BITPERLONG)
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#define FDS_BYTES(nr) (FDS_LONGS(nr)*sizeof(long))
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/*
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* We do a VERIFY_WRITE here even though we are only reading this time:
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* we'll write to it eventually..
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*
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* Use "unsigned long" accesses to let user-mode fd_set's be long-aligned.
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*/
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static inline
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int get_fd_set(unsigned long nr, void __user *ufdset, unsigned long *fdset)
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{
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nr = FDS_BYTES(nr);
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if (ufdset)
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return copy_from_user(fdset, ufdset, nr) ? -EFAULT : 0;
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memset(fdset, 0, nr);
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return 0;
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}
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static inline unsigned long __must_check
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set_fd_set(unsigned long nr, void __user *ufdset, unsigned long *fdset)
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{
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if (ufdset)
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return __copy_to_user(ufdset, fdset, FDS_BYTES(nr));
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return 0;
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}
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static inline
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void zero_fd_set(unsigned long nr, unsigned long *fdset)
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{
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memset(fdset, 0, FDS_BYTES(nr));
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}
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#define MAX_INT64_SECONDS (((s64)(~((u64)0)>>1)/HZ)-1)
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extern int do_select(int n, fd_set_bits *fds, struct timespec64 *end_time);
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extern int do_sys_poll(struct pollfd __user * ufds, unsigned int nfds,
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struct timespec64 *end_time);
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extern int core_sys_select(int n, fd_set __user *inp, fd_set __user *outp,
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fd_set __user *exp, struct timespec64 *end_time);
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extern int poll_select_set_timeout(struct timespec64 *to, time64_t sec,
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long nsec);
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#endif /* _LINUX_POLL_H */
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