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CentOS 7.0 - man page for tcl_panicva (centos section 3)

Tcl_Panic(3)						      Tcl Library Procedures						      Tcl_Panic(3)


Tcl_Panic, Tcl_PanicVA, Tcl_SetPanicProc - report fatal error and abort
#include <tcl.h> void Tcl_Panic(format, arg, arg, ...) void Tcl_PanicVA(format, argList) void Tcl_SetPanicProc(panicProc)
const char* format (in) A printf-style format string. arg (in) Arguments matching the format string. va_list argList (in) An argument list of arguments matching the format string. Must have been initialized using va_start, and cleared using va_end. Tcl_PanicProc *panicProc (in) Procedure to report fatal error message and abort. _________________________________________________________________
When the Tcl library detects that its internal data structures are in an inconsistent state, or that its C procedures have been called in a manner inconsistent with their documentation, it calls Tcl_Panic to display a message describing the error and abort the process. The for- mat argument is a format string describing how to format the remaining arguments arg into an error message, according to the same format- ting rules used by the printf family of functions. The same formatting rules are also used by the built-in Tcl command format. In a freshly loaded Tcl library, Tcl_Panic prints the formatted error message to the standard error file of the process, and then calls abort to terminate the process. Tcl_Panic does not return. Tcl_SetPanicProc may be used to modify the behavior of Tcl_Panic. The panicProc argument should match the type Tcl_PanicProc: typedef void Tcl_PanicProc( const char *format, arg, arg,...); After Tcl_SetPanicProc returns, any future calls to Tcl_Panic will call panicProc, passing along the format and arg arguments. To maintain consistency with the callers of Tcl_Panic, panicProc must not return; it must call abort. panicProc should avoid making calls into the Tcl library, or into other libraries that may call the Tcl library, since the original call to Tcl_Panic indicates the Tcl library is not in a state of reliable operation. The typical use of Tcl_SetPanicProc arranges for the error message to be displayed or reported in a manner more suitable for the applica- tion or the platform. As an example, the Windows implementation of wish calls Tcl_SetPanicProc to force all panic messages to be displayed in a system dialog box, rather than to be printed to the standard error file (usually not visible under Windows). Although the primary callers of Tcl_Panic are the procedures of the Tcl library, Tcl_Panic is a public function and may be called by any extension or application that wishes to abort the process and have a panic message displayed the same way that panic messages from Tcl will be displayed. Tcl_PanicVA is the same as Tcl_Panic except that instead of taking a variable number of arguments it takes an argument list.
abort(3), printf(3), exec(n), format(n)
abort, fatal, error Tcl 8.4 Tcl_Panic(3)