STREAMS-based Transport Provider Interface

Fatal Errors

Fatal errors are those which can not be corrected by the transport user, or those errors which result in an uncorrectable error in the interface or in the transport provider.

The most common of these errors are listed under the appropriate primitives. The transport provider should issue fatal errors only if the transport user can not correct the condition which caused the error or if the transport provider has no means of reporting a transport user correctable error. If the transport provider detects an uncorrectable non-protocol error internal to the transport provider, the provider should issue a fatal error to the user.

Fatal errors are indicated to the transport user via the STREAMS message type M_ERROR with the UNIX system error EPROTO. This is the only type of error that the transport provider should use to indicate a fatal protocol error to the transport user. The message M_ERROR will result in the failure of all the operating system service routines on the stream. The only way for a user to recover from a fatal error is to ensure that all processes close the file associated with the stream. At that point, the user may reopen the file associated with the stream.

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OpenServer 6 and UnixWare (SVR5) HDK - June 2005