Initializing help system before first use

# setioerrmsg

Purpose
Set an error message for an IO driver operation.
Synopsis
`void setioerrmsg(XPRMcontext ctx, const char *msg, int ecode);`
Arguments

ctx | Mosel's execution context
msg | Error message
ecode | Error code

Further information
This function may be used from functions implementing an IO driver (namely operations open, close, read, write and skip) in order to set a descriptive message before returning an error status (see Section Defining IO drivers).
Parent Topic Input and output

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