[so] [So][Tema1][Windows] Asteptare scriere in pipe

[David Cristian]

Mda, a fost o idee proasta.
Am facut redirectarea fara sa ma folosesc de tata.

Imi cer scuze de spam :-(.

David.

2009/4/5 David Cristian <david.cristian1987 at gmail.com>

> Cred ca nu m-am facut inteles.
> Creez cate un pipe pt fiecare (si A si B)
> A - pt stdout si B pentru stdin.
> Stiu ca puteam sa fac asta direct dar am vrut sa fac asa.
> Fac asa:
> [code]
>             SECURITY_ATTRIBUTES saAttr;
>             // Set the bInheritHandle flag so pipe handles are inherited.
>             saAttr.nLength = sizeof(SECURITY_ATTRIBUTES);
>             saAttr.bInheritHandle = TRUE;
>             saAttr.lpSecurityDescriptor = NULL;
>
>             //adaugam pipe info in procesul anterior
>             MyProcess lastProc = pipeProcesses[pipeProcesses.size() - 1];
>             // Create a pipe for the child process's STDOUT.
>             if ( ! CreatePipe(&lastProc.sPipes.hStdOUT_Rd,
> &lastProc.sPipes.hStdOUT_Wr, &saAttr, 0) )
>               cerr<<"Stdout Pipe CreatePipe";
>             // Ensure the read handle to the pipe for STDOUT is not
> inherited.
>             if ( ! SetHandleInformation(lastProc.sPipes.hStdOUT_Rd,
> HANDLE_FLAG_INHERIT, 0) )
>               cerr<<"Stdout Pipe SetHandleInformation";
>             lastProc.pipeFlag |= PIPE_OUT;
>             pipeProcesses[pipeProcesses.size() - 1] = lastProc;
>             if ( ! CreatePipe(&crtProcess.sPipes.hStdIN_Rd,
> &crtProcess.sPipes.hStdIN_Wr, &saAttr, 0) )
>               cerr<<"Stdin CreatePipe";
>             // Ensure the read handle to the pipe for STDOUT is not
> inherited.
>             if ( ! SetHandleInformation(crtProcess.sPipes.hStdIN_Wr,
> HANDLE_FLAG_INHERIT, 0) )
>               cerr<<"Stdin SetHandleInformation";
>             crtProcess.pipeFlag = PIPE_IN;
> [/code]
>
> Ideea e ca _functioneaza_, dar numai in debug.
> Lasand tema la o parte, intrebarea mea este daca si (daca da) cum pot sa
> astept terminarea scrierii in pipe.
>
> David.
>
> 2009/4/5 Razvan Deaconescu <razvan.deaconescu at cs.pub.ro>
>
>> On Sun, 2009-04-05 at 22:54 +0300, David Cristian wrote:
>>
>> > Fiecare proces din pipe are o structura :
>> >     typedef struct
>> >     {
>> >         HANDLE hStdOUT_Rd;
>> >         HANDLE hStdOUT_Wr;
>> >         HANDLE hStdIN_Rd;
>> >         HANDLE hStdIN_Wr;
>> >     }Pipe;
>> >
>> > Daca am A | B, A are stdout : hStdOUT_Wr si B are stdin: hStdIN_Rd.
>> > Am setat sa fie inheritable doar hStdOUT_Wr pt A si hStdIN_Rd pentru
>> > B.
>> >
>> > Procesul tata citeste din hStdOUT_Rd al lui A si scie in hStdIN_Wr.
>> >
>> > Poate e o abordare gresita, dar as vrea sa vad cum s-ar putea
>> > solutiona
>> > (de ce merge daca pun breakpoint si daca rulez normal nu).
>> > Banuiesc ca nu se termina de scris in pipe inainte de a se incerca
>> > citirea.
>>
>> Apelul CreatePipe[1] este folosit pentru crearea de pipe-uri. Tu nu-l
>> folosesti?
>>
>> Razvan
>>
>> [1] http://msdn.microsoft.com/en-us/library/aa365152(VS.85).aspx<http://msdn.microsoft.com/en-us/library/aa365152%28VS.85%29.aspx>
>>
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>>
>
>
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