Nested calls Post: 26020

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Top Forums Shell Programming and Scripting Nested calls Post 26020 by Perderabo on Friday 9th of August 2002 10:56:28 AM

08-09-2002

Administrator Emeritus

boaadm 26331 26260 0 Aug 03 ? 0:00 ftp -n

In the line above, 26331 is the pid of the ftp process, and 26260 is the pid of the parent of the ftp process. Should that parent die, the ppid will switch to 1 and init will become the new parent. Since the ppid is not 1, the parent process has not died.

This means one of two things:

1) You are mistaken and there simply is no script B. Script A itself is invoking ftp. (There may be a script B that does something else and then exits, but it didn't invoke that ftp process.)

2) There was a script B, but instead of running ftp, it did an "exec ftp". The exec command causes the new program to overlay the old one. You can never return from an exec. The old program is gone.

Perderabo

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tcl_allowexceptions

Tcl_AllowExceptions(3)					      Tcl Library Procedures					    Tcl_AllowExceptions(3)

__________________________________________________________________________________________________________________________________________________

NAME

       Tcl_AllowExceptions - allow all exceptions in next script evaluation

SYNOPSIS

       #include <tcl.h>

       Tcl_AllowExceptions(interp)

ARGUMENTS

       Tcl_Interp *interp (in)		Interpreter in which script will be evaluated.
_________________________________________________________________

DESCRIPTION

       If  a  script is evaluated at top-level (i.e. no other scripts are pending evaluation when the script is invoked), and if the script termi-
       nates with a completion code other than TCL_OK, TCL_ERROR or TCL_RETURN, then Tcl normally converts this into a TCL_ERROR  return  with	an
       appropriate  message.  The particular script evaluation procedures of Tcl that act in the manner are Tcl_EvalObjEx, Tcl_EvalObjv, Tcl_Eval,
       Tcl_EvalEx, Tcl_GlobalEval, Tcl_GlobalEvalObj, Tcl_VarEval and Tcl_VarEvalVA.

       However, if Tcl_AllowExceptions is invoked immediately before calling one of those a procedures, then arbitrary completion codes  are  per-
       mitted from the script, and they are returned without modification.  This is useful in cases where the caller can deal with exceptions such
       as TCL_BREAK or TCL_CONTINUE in a meaningful way.

KEYWORDS

       continue, break, exception, interpreter

Tcl									7.4						    Tcl_AllowExceptions(3)

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