37     int m_readFd;  member in Pipe
44     Pipe(int readFd, int writeFd) : m_readFd{readFd}, m_writeFd{writeFd} {  in Pipe()
45         fcntl(m_readFd, F_SETFD, FD_CLOEXEC);
49         m_readFd = rval.m_readFd;  in Pipe()
51         rval.m_readFd = 0;  in Pipe()
55         if (m_readFd) close(m_readFd);  in ~Pipe()
60             fcntl(m_readFd, F_SETFD, 0);  in preserveOverFork()
63             fcntl(m_readFd, F_SETFD, FD_CLOEXEC);  in preserveOverFork()
67     int getReadFd() { return m_readFd; }  in getReadFd()
76         int error = read(m_readFd, &val, sizeof(val));  in wait()
81         int error = read(m_readFd, &val, sizeof(val));  in wait_ret_error()
91         int error = read(m_readFd, &v, sizeof(T));  in recv()