[9fans] exit message

[arisawa]

Hello,

Do we have any way to find exit message of child process in the  
following case?
That is, parent waits child to finish by reading output of child  
process.

        Biobuf ib;
        int fd[2];
        pipe(fd);
        switch(fork()){
        case -1:
                return -1;
        case 0:
                dup(fd[1], 1);
                dup(fd[1], 2);
                close(fd[1]);
                exec(path, argv);
        default:
                close(fd[1]);
                break;
        }

        Binit(&ib, fd[0], OREAD);
        while((p = Brdstr(&ib,'\n',1))){
                ...
        }
        /* how to find exit message of child process here? */

Kenji Arisawa