97d0d70b73
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Signed-off-by: Edoardo Vacchi <evacchi@users.noreply.github.com> Signed-off-by: Adrian Cole <adrian@tetrate.io> Co-authored-by: Crypt Keeper <64215+codefromthecrypt@users.noreply.github.com> Co-authored-by: Achille <achille.roussel@gmail.com> Co-authored-by: Adrian Cole <adrian@tetrate.io>
31 lines
733 B
Go
31 lines
733 B
Go
//go:build linux || darwin
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package sysfs
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import (
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"net"
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"syscall"
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"github.com/tetratelabs/wazero/internal/platform"
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)
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const MSG_PEEK = syscall.MSG_PEEK
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// recvfromPeek exposes syscall.Recvfrom with flag MSG_PEEK on POSIX systems.
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func recvfromPeek(conn *net.TCPConn, p []byte) (n int, errno syscall.Errno) {
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syscallConn, err := conn.SyscallConn()
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if err != nil {
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return 0, platform.UnwrapOSError(err)
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}
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// Prioritize the error from Recvfrom over Control
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if controlErr := syscallConn.Control(func(fd uintptr) {
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var recvfromErr error
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n, _, recvfromErr = syscall.Recvfrom(int(fd), p, MSG_PEEK)
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errno = platform.UnwrapOSError(recvfromErr)
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}); errno == 0 {
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errno = platform.UnwrapOSError(controlErr)
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}
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return
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}
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