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Re: Blocking Socket

On 14 May 2004, at 2:14 PM, Dario wrote:

I have a socket problem. even if using this

fcntl(sock,F_SETFD,O_NONBLOCK);

You want F_SETFL. F_SETFD is only used for the close-on-exec bit.

If you check the error return, you can spot errors like this more easily.

/** Type of error return; used by error_wrap */
enum error_return_type {
DIRECT, /**< pthread functions; return 0 or Exxx */
NEGATIVE, /**< sigsafe functions; return >= 0 or -Exxx */
ERRNO /**< old-school functions; return >= 0 or -1, Exxx in errno */
};

/** Aborts if retval/type/errno indicate error. */
int error_wrap(int retval, const char *fname, enum error_return_type type);

int oldflags;
error_wrap(oldflags = fcntl(sock, F_GETFL), "fcntl(F_GETFL)", ERRNO);
error_wrap(fcntl(sock, F_SETFL, oldflags | O_NONBLOCK), "fcntl(F_SETFL)", ERRNO);

The socket blocks on this call

ret = ::read(fd, &data[ctr], 1 );

Are you sure fd and sock are the same descriptor?

Scott
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References: 
 >Blocking Socket (From: Dario <email@hidden>)



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