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Tcl_FindExecutable(3) Tcl Library Procedures Tcl_FindExecutable(3)
Tcl_FindExecutable, Tcl_GetNameOfExecutable - identify or return the
name of the binary file containing the application
const char *
char *argv0 (in) The first command-line argument to the
program, which gives the application's name.
The Tcl_FindExecutable procedure computes the full path name of the
executable file from which the application was invoked and saves it for
Tcl's internal use. The executable's path name is needed for several
purposes in Tcl. For example, it is needed on some platforms in the
implementation of the load command. It is also returned by the info
On UNIX platforms this procedure is typically invoked as the very first
thing in the application's main program; it must be passed argv as
its argument. It is important not to change the working directory
before the invocation. Tcl_FindExecutable uses argv0 along with the
PATH environment variable to find the application's executable, if
possible. If it fails to find the binary, then future calls to info
nameofexecutable will return an empty string.
On Windows platforms this procedure is typically invoked as the very
first thing in the application's main program as well; Its argv
argument is only used to indicate whether the executable has a stderr
channel (any non-null value) or not (the value null). If
Tcl_SetPanicProc is never called and no debugger is running, this
determines whether the panic message is sent to stderr or to a standard
Tcl_GetNameOfExecutable simply returns a pointer to the internal full
path name of the executable file as computed by Tcl_FindExecutable.
This procedure call is the C API equivalent to the info
nameofexecutable command. NULL is returned if the internal full path
name has not been computed or unknown.
binary, executable file
Tcl 8.1 Tcl_FindExecutable(3)