Produces an error message.
Transport Layer Interface Library (libtli.a)
The t_error subroutine produces a message on the standard error output that describes the last error encountered during a call to a transport function.
The t_error subroutine prints the user-supplied error message, followed by a colon and the standard transport-function error message for the current value contained in the t_errno variable.
| Item | Description |
|---|---|
| errmsg | Specifies a user-supplied error message that gives context to the error. |
| Item | Description |
|---|---|
| t_errno | Specifies which standard transport-function error message
to print. If the value of the t_errno variable is TSYSERR,
the t_error subroutine also prints the standard error message
for the current value contained in the errno global variable.
The t_errno variable is set when an error occurs and is not cleared on subsequent successful calls. |
| t_nerr | Specifies the maximum index value for the t_errlist array. The t_errlist array is the array of message strings allowing user-message formatting. The t_errno variable can be used as an index into this array to retrieve the error message string (without a terminating new-line character). |
A t_connect subroutine is unsuccessful on transport end point fd2 because a bad address was given, and the following call follows the failure:
t_error("t_connect failed on fd2")The diagnostic message would print as:
t_connect failed on fd2: Incorrect transport address formatIn this example, t_connect failed on fd2 tells the user which function was unsuccessful on which transport end point, and Incorrect transport address format identifies the specific error that occurred.