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71 lines
1.5 KiB
71 lines
1.5 KiB
//go:build aix || android || darwin || dragonfly || freebsd || hurd || illumos || ios || linux || netbsd || openbsd || solaris
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package nbconn
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// Not using unix build tag for support on Go 1.18.
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import (
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"errors"
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"io"
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"syscall"
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)
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// realNonblockingWrite does a non-blocking write. readFlushLock must already be held.
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func (c *NetConn) realNonblockingWrite(b []byte) (n int, err error) {
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c.nonblockWriteBuf = b
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c.nonblockWriteN = 0
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c.nonblockWriteErr = nil
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err = c.rawConn.Write(func(fd uintptr) (done bool) {
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c.nonblockWriteN, c.nonblockWriteErr = syscall.Write(int(fd), c.nonblockWriteBuf)
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return true
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})
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n = c.nonblockWriteN
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if err == nil && c.nonblockWriteErr != nil {
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if errors.Is(c.nonblockWriteErr, syscall.EWOULDBLOCK) {
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err = ErrWouldBlock
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} else {
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err = c.nonblockWriteErr
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}
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}
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if err != nil {
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// n may be -1 when an error occurs.
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if n < 0 {
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n = 0
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}
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return n, err
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}
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return n, nil
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}
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func (c *NetConn) realNonblockingRead(b []byte) (n int, err error) {
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var funcErr error
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err = c.rawConn.Read(func(fd uintptr) (done bool) {
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n, funcErr = syscall.Read(int(fd), b)
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return true
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})
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if err == nil && funcErr != nil {
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if errors.Is(funcErr, syscall.EWOULDBLOCK) {
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err = ErrWouldBlock
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} else {
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err = funcErr
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}
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}
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if err != nil {
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// n may be -1 when an error occurs.
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if n < 0 {
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n = 0
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}
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return n, err
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}
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// syscall read did not return an error and 0 bytes were read means EOF.
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if n == 0 {
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return 0, io.EOF
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}
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return n, nil
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}
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