Eu não sou capaz de receber a mensagem de socket no atual processo, quando a sua espera para o seu filho a sair.

código é algo como abaixo
/ / em uma discussão do atual processo
/ / 1 discussão

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int numBytes \u003d ler (sockid, buf, SIZE); / / Agora a discussão é bloqueada
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/ / no outro thread
/ / 2 discussão

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if ((pid \u003d fork ()) \u003d\u003d 0) / / processo filho
(
exec (...);
)
diferente
(
waitpid (PID); / / Agora o processo está bloqueado para a saída da criança
)
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No cenário acima, quando criança é executado e é bloqueado para a mãe da criança, de saída, mesmo quando há alguma mensagem disponível na tomada descrtiptor para a primeira discussão de ler, não sou capaz de ler que, mesmo após a saída da criança. assim alguém poderia jogar mais luz sobre o cenário acima?

Thanks in advance
Swap007