ERROR man page on SmartOS

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error(n)		     Tcl Built-In Commands		      error(n)


       error - Generate an error

       error message ?info? ?code?

       Returns	a  TCL_ERROR  code,  which causes command interpretation to be
       unwound.	 Message is a string that is returned to  the  application  to
       indicate what went wrong.

       The  -errorinfo return option of an interpreter is used to accumulate a
       stack trace of what was in progress when an error occurred;  as	nested
       commands unwind, the Tcl interpreter adds information to the -errorinfo
       return option.  If the info argument is present, it is used to initialā€
       ize  the	 -errorinfo  return  options and the first increment of unwind
       information will not be added by the Tcl interpreter.  In other	words,
       the  command  containing the error command will not appear in the stack
       trace; in its place will be info.  Historically, this feature had  been
       most  useful  in	 conjunction with the catch command: if a caught error
       cannot be handled successfully, info can be  used  to  return  a	 stack
       trace reflecting the original point of occurrence of the error:

	      catch {...} errMsg
	      set savedInfo $::errorInfo
	      error $errMsg $savedInfo

       When  working  with Tcl 8.5 or later, the following code should be used

	      catch {...} errMsg options
	      return -options $options $errMsg

       If the code argument is present,	 then  its  value  is  stored  in  the
       -errorcode  return option.  The -errorcode return option is intended to
       hold a machine-readable description of the error in  cases  where  such
       information is available; see the return manual page for information on
       the proper format for this option's value.

       Generate an error if a basic mathematical operation fails:

	      if {1+2 != 3} {
		  error "something is very wrong with addition"

       catch(n), return(n)

       error, exception

Tcl								      error(n)

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