Function report |
Source Code:fs\select.c |
Create Date:2022-07-28 20:07:02 |
Last Modify:2020-03-18 10:25:38 | Copyright©Brick |
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Annotation kernel can get tool activity | Download SCCT | Chinese |
Name:do_select
Proto:static int do_select(int n, fd_set_bits *fds, struct timespec64 *end_time)
Type:int
Parameter:
Type | Parameter | Name |
---|---|---|
int | n | |
fd_set_bits * | fds | |
struct timespec64 * | end_time |
481 | timed_out = 0 |
482 | slack = 0 |
483 | busy_flag = If net_busy_loop_on() Then POLL_BUSY_LOOP Else 0 |
484 | busy_start = 0 |
487 | retval = max_select_fd(n, fds) |
494 | poll_initwait( & table) |
496 | If end_time && Not seconds && Not nanoseconds Then |
501 | If end_time && Not timed_out Then slack = select_estimate_accuracy(end_time) |
504 | retval = 0 |
505 | cycle |
507 | bool can_busy_loop = false |
513 | bit = 1 |
519 | If all_bits == 0 Then |
520 | i += BITS_PER_LONG |
521 | Continue |
524 | When j < BITS_PER_LONG cycle |
531 | If file Then |
537 | If mask & POLLIN_SET && in & bit Then |
542 | If mask & POLLOUT_SET && out & bit Then |
547 | If mask & POLLEX_SET && ex & bit Then |
553 | If retval Then |
554 | can_busy_loop = false |
555 | busy_flag = 0 |
561 | Else if busy_flag & mask Then can_busy_loop = true |
572 | cond_resched() |
574 | _qproc = NULL |
575 | If retval || timed_out || signal_pending(current process) Then Break |
577 | If error Then |
583 | If can_busy_loop && Not need_resched() Then |
584 | If Not busy_start Then |
585 | busy_start = busy_loop_current_time() |
586 | Continue |
588 | If Not poll/select we use the global sysctl_net_ll_poll value Then Continue |
591 | busy_flag = 0 |
603 | If Not poll_schedule_timeout( & table, TASK_INTERRUPTIBLE, to, slack) Then timed_out = 1 |
608 | poll_freewait( & table) |
610 | Return retval |
Name | Describe |
---|---|
core_sys_select | We can actually return ERESTARTSYS instead of EINTR, but I'd* like to be certain this leads to no problems. So I return* EINTR just for safety.* Update: ERESTARTSYS breaks at least the xview clock binary, so |
compat_core_sys_select | We can actually return ERESTARTSYS instead of EINTR, but I'd* like to be certain this leads to no problems. So I return* EINTR just for safety.* Update: ERESTARTSYS breaks at least the xview clock binary, so |
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