Function report |
Source Code:arch\x86\kernel\apm_32.c |
Create Date:2022-07-28 08:22:28 |
Last Modify:2020-03-12 14:18:49 | Copyright©Brick |
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Annotation kernel can get tool activity | Download SCCT | Chinese |
Name:do_read
Proto:static ssize_t do_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos)
Type:ssize_t
Parameter:
Type | Parameter | Name |
---|---|---|
struct file * | fp | |
char __user * | buf | |
size_t | count | |
loff_t * | ppos |
1469 | If check_apm_user(as, "read") Then Return -EIO |
1471 | If count < sizeof(apm_event_t) Then Return -EINVAL |
1473 | If queue_empty(as) && f_flags & O_NONBLOCK Then Return -EAGAIN |
1477 | When i >= size of event && Not queue_empty(as) cycle |
1478 | event = get_queued_event(as) |
1479 | If copy_to_user(buf, & event, size of event ) Then |
1482 | Return -EFAULT |
1485 | Case event == APM_SYS_SUSPEND |
1486 | Case event == APM_USER_SUSPEND |
1487 | suspends_read++ |
1488 | Break |
1490 | Case event == Events (results of Get PM Event) |
1491 | Case event == APM_USER_STANDBY |
1492 | standbys_read++ |
1493 | Break |
1502 | Return 0 |
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