mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-12-21 17:52:12 +00:00
56 lines
1.6 KiB
Go
56 lines
1.6 KiB
Go
|
package sysfs
|
||
|
|
|
||
|
|
import (
|
||
|
|
"unsafe"
|
||
|
|
|
||
|
|
"github.com/tetratelabs/wazero/experimental/sys"
|
||
|
|
)
|
||
|
|
|
||
|
|
// pollFd is the struct to query for file descriptor events using poll.
|
||
|
|
type pollFd struct {
|
||
|
|
// fd is the file descriptor.
|
||
|
|
fd int32
|
||
|
|
// events is a bitmap containing the requested events.
|
||
|
|
events int16
|
||
|
|
// revents is a bitmap containing the returned events.
|
||
|
|
revents int16
|
||
|
|
}
|
||
|
|
|
||
|
|
// newPollFd is a constructor for pollFd that abstracts the platform-specific type of file descriptors.
|
||
|
|
func newPollFd(fd uintptr, events, revents int16) pollFd {
|
||
|
|
return pollFd{fd: int32(fd), events: events, revents: revents}
|
||
|
|
}
|
||
|
|
|
||
|
|
// _POLLIN subscribes a notification when any readable data is available.
|
||
|
|
const _POLLIN = 0x0001
|
||
|
|
|
||
|
|
// _poll implements poll on Darwin via the corresponding libc function.
|
||
|
|
func _poll(fds []pollFd, timeoutMillis int32) (n int, errno sys.Errno) {
|
||
|
|
var fdptr *pollFd
|
||
|
|
nfds := len(fds)
|
||
|
|
if nfds > 0 {
|
||
|
|
fdptr = &fds[0]
|
||
|
|
}
|
||
|
|
n1, _, err := syscall_syscall6(
|
||
|
|
libc_poll_trampoline_addr,
|
||
|
|
uintptr(unsafe.Pointer(fdptr)),
|
||
|
|
uintptr(nfds),
|
||
|
|
uintptr(int(timeoutMillis)),
|
||
|
|
uintptr(unsafe.Pointer(nil)),
|
||
|
|
uintptr(unsafe.Pointer(nil)),
|
||
|
|
uintptr(unsafe.Pointer(nil)))
|
||
|
|
return int(n1), sys.UnwrapOSError(err)
|
||
|
|
}
|
||
|
|
|
||
|
|
// libc_poll_trampoline_addr is the address of the
|
||
|
|
// `libc_poll_trampoline` symbol, defined in `poll_darwin.s`.
|
||
|
|
//
|
||
|
|
// We use this to invoke the syscall through syscall_syscall6 imported below.
|
||
|
|
var libc_poll_trampoline_addr uintptr
|
||
|
|
|
||
|
|
// Imports the select symbol from libc as `libc_poll`.
|
||
|
|
//
|
||
|
|
// Note: CGO mechanisms are used in darwin regardless of the CGO_ENABLED value
|
||
|
|
// or the "cgo" build flag. See /RATIONALE.md for why.
|
||
|
|
//go:cgo_import_dynamic libc_poll poll "/usr/lib/libSystem.B.dylib"
|