180ff682d9
Signed-off-by: Adrian Cole <adrian@tetrate.io> Co-authored-by: Takeshi Yoneda <takeshi@tetrate.io>
43 lines
1.3 KiB
Go
43 lines
1.3 KiB
Go
package sysfs
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import (
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"syscall"
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"unsafe"
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"github.com/tetratelabs/wazero/experimental/sys"
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"github.com/tetratelabs/wazero/internal/platform"
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)
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// syscall_select implements _select on Darwin
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//
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// Note: We implement our own version instead of relying on syscall.Select
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// because the latter only returns the error and discards the result.
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func syscall_select(n int, r, w, e *platform.FdSet, timeoutNanos int32) (ready bool, errno sys.Errno) {
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var t *syscall.Timeval
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if timeoutNanos >= 0 {
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tv := syscall.NsecToTimeval(int64(timeoutNanos))
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t = &tv
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}
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r1, _, err := syscall_syscall6(
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libc_select_trampoline_addr,
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uintptr(n),
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uintptr(unsafe.Pointer(r)),
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uintptr(unsafe.Pointer(w)),
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uintptr(unsafe.Pointer(e)),
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uintptr(unsafe.Pointer(t)),
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0)
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return r1 > 0, sys.UnwrapOSError(err)
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}
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// libc_select_trampoline_addr is the address of the
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// `libc_select_trampoline` symbol, defined in `select_darwin.s`.
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//
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// We use this to invoke the syscall through syscall_syscall6 imported below.
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var libc_select_trampoline_addr uintptr
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// Imports the select symbol from libc as `libc_select`.
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//
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// Note: CGO mechanisms are used in darwin regardless of the CGO_ENABLED value
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// or the "cgo" build flag. See /RATIONALE.md for why.
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//go:cgo_import_dynamic libc_select select "/usr/lib/libSystem.B.dylib"
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