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net: add diagnostic to try to catch selfConnect bug earlier

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TBR=dsymonds

R=golang-dev
CC=golang-dev
https://golang.org/cl/5683057
This commit is contained in:
Rob Pike 2012-02-21 14:53:07 +11:00
parent ce837b308f
commit 2155a0408e
1 changed files with 8 additions and 0 deletions
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8
src/pkg/net/tcpsock_posix.go
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@ -230,6 +230,13 @@ func DialTCP(net string, laddr, raddr *TCPAddr) (*TCPConn, error) {
fd, err := internetSocket(net, laddr.toAddr(), raddr.toAddr(), syscall.SOCK_STREAM, 0, "dial", sockaddrToTCP)
checkRaddr := func(s string) {
if err == nil && fd.raddr == nil {
panic("nil raddr in DialTCP: " + s)
}
}
checkRaddr("early")
// TCP has a rarely used mechanism called a 'simultaneous connection' in
// which Dial("tcp", addr1, addr2) run on the machine at addr1 can
// connect to a simultaneous Dial("tcp", addr2, addr1) run on the machine
@ -250,6 +257,7 @@ func DialTCP(net string, laddr, raddr *TCPAddr) (*TCPConn, error) {
for i := 0; i < 2 && err == nil && laddr == nil && selfConnect(fd); i++ {
fd.Close()
fd, err = internetSocket(net, laddr.toAddr(), raddr.toAddr(), syscall.SOCK_STREAM, 0, "dial", sockaddrToTCP)
checkRaddr("after close")
}
if err != nil {