29     int m_writeFd;  member in Pipe
34     Pipe(int readFd, int writeFd) : m_readFd{readFd}, m_writeFd{writeFd} {  in Pipe()
36         fcntl(m_writeFd, F_SETFD, FD_CLOEXEC);
40         m_writeFd = rval.m_writeFd;  in Pipe()
42         rval.m_writeFd = 0;  in Pipe()
47         if (m_writeFd)  in ~Pipe()
48             close(m_writeFd);  in ~Pipe()
53             fcntl(m_writeFd, F_SETFD,0);  in preserveOverFork()
56             fcntl(m_writeFd, F_SETFD, FD_CLOEXEC);  in preserveOverFork()
63         return m_writeFd;  in getWriteFd()
67         int error = write(m_writeFd, &val, sizeof(val));  in signal()
81         int error = write(m_writeFd, &v, sizeof(T));  in send()