throw - readable error
throw type message
throw(1t) Tcl Built-In Commands throw(1t) ______________________________________________________________________________ NAME throw - Generate a machine-readable error SYNOPSIS throw type message ______________________________________________________________________________ DESCRIPTION This command causes the current evaluation to be unwound with an error. The error created is described by the type and message arguments: type must contain a list of words describing the error in a form that is machine-readable (and which will form the error-code part of the result dictionary), and message should contain text that is intended for dis- play to a human being. The stack will be unwound until the error is trapped by a suitable catch or try command. If it reaches the event loop without being trapped, it will be reported through the bgerror mechanism. If it reaches the top level of script evaluation in tclsh, it will be printed on the console before, in the non-interactive case, causing an exit (the behavior in other programs will depend on the details of how Tcl is embedded and used). By convention, the words in the type argument should go from most gen- eral to most specific. EXAMPLES The following produces an error that is identical to that produced by expr when trying to divide a value by zero. throw {ARITH DIVZERO {divide by zero}} {divide by zero} ATTRIBUTES See attributes(7) for descriptions of the following attributes: +---------------+------------------+ |ATTRIBUTE TYPE | ATTRIBUTE VALUE | +---------------+------------------+ |Availability | runtime/tcl-8 | +---------------+------------------+ |Stability | Uncommitted | +---------------+------------------+ SEE ALSO catch(n), error(n), errorCode(n), errorInfo(n), return(n), try(n) KEYWORDS error, exception NOTES Source code for open source software components in Oracle Solaris can be found at https://www.oracle.com/downloads/opensource/solaris-source- code-downloads.html. This software was built from source available at https://github.com/oracle/solaris-userland. The original community source was downloaded from http://prdownloads.sourceforge.net/tcl/tcl- core8.6.7-src.tar.gz. Further information about this software can be found on the open source community website at https://www.tcl.tk/. Tcl 8.6 throw(1t)