RE: Reading files from a root executable

From: Philippe Canal <pcanal_at_fnal.gov>
Date: Fri, 18 Nov 2005 08:57:32 -0600

> Int_t n_run[10000000], n_ev[10000000];

Most likely this is the problem. You are trying to allocated 80Mb on the stack.
Use a TArray, and std::vector<int> or a new'ed array instead.

Cheers,
Philippe

-----Original Message-----
From: owner-roottalk_at_pcroot.cern.ch [mailto:owner-roottalk_at_pcroot.cern.ch] On Behalf Of Luca Grandi
Sent: Thursday, November 17, 2005 12:18 PM To: roottalk_at_root.cern.ch
Subject: [ROOT] Reading files from a root executable

Hi I continue to get the following error

luca$ ./lifetime

• Break *** segmentation violation Abort trap

in executing the executable called lifetime. Its source is as it follows and it is compiled to run outside root.

#include <iostream>
#include "TFile.h"
#include "stdio.h"
#include "stdarg.h"
#include <fstream>
#include "Riostream.h"

int main()
{

    Int_t nlines=0;

    Int_t n_run[10000000], n_ev[10000000];     ifstream FILE_ntp;
    FILE_ntp.open("run800.ntp");
    while (1){
    if (!FILE_ntp.good()) {break; printf("ERRORE\n");}

      FILE_ntp >> n_run[nlines];
      if (nlines<5) printf("%d\n",n_ev[nlines]);
      nlines++;
   }        

}

To create the executable I have used the makefile attached at the end of the mail: in the same directory I have the standard Makefile.Arch file. Compiling it under OSX gives me the output

c++ -O2 -pipe -Wall -W -Woverloaded-virtual -D_REENTRANT -Wno-long-double -I/sw/include/root -c lifetime.cxx
MACOSX_DEPLOYMENT_TARGET=10.4 c++ -O2 -bind_at_load lifetime.o

-L/sw/lib/root -lCore -lCint -lHist -lGraf -lGraf3d -lGpad -lTree -lRint
-lPostscript -lMatrix -lPhysics -L/usr/X11R6/lib -lfreetype -lpthread -lm
-ldl  -o lifetime

lifetime done
MACOSX_DEPLOYMENT_TARGET=10.4 c++ -dynamiclib -single_module -undefined dynamic_lookup -o
make: *** [all] Abort trap

WHAT IS the problem? I have written other small programs and I get the same error each time I Try to read a file (for example with scanf) while I have no problem to write on files. Note that they are working properly if executed as a script in root

Thanks
Luca

# Makefile for the ROOT test programs.
# This Makefile shows nicely how to compile and link applications
# using the ROOT libraries on all supported platforms.
#
# Copyright (c) 2000 Rene Brun and Fons Rademakers
#
# Author: Fons Rademakers, 29/2/2000

include Makefile.arch

#---------------------------------------------------------------------------

---

LIFETIMEO       = lifetime.$(ObjSuf)
LIFETIMES       = lifetime.$(SrcSuf)
LIFETIME       = lifetime$(ExeSuf)



OBJS          = $(LIFETIMEO)

PROGRAMS      = $(LIFETIME)



#---------------------------------------------------------------------------

---

.SUFFIXES: .$(SrcSuf) .$(ObjSuf) .$(DllSuf)

all:            $(PROGRAMS)

ifeq ($(PLATFORM),macosx)


# We need to make both the .dylib and the .so

        $(LD) $(SOFLAGS) $(EVENTO) $(OutPutOpt) $(EVENTSO)
        $(LD) -bundle -undefined $(UNDEFOPT) $(LDFLAGS) $^ \
           $(OutPutOpt) $(subst .$(DllSuf),.so,$@)

endif

        @echo "$@ done"

$(LIFETIME):      $(LIFETIMEO)
        $(LD) $(LDFLAGS) $^ $(LIBS) $(OutPutOpt)$@
        @echo "$@ done"

clean:
        @rm -f $(OBJS) core

.SUFFIXES: .$(SrcSuf)



###


.$(SrcSuf).$(ObjSuf):
    $(CXX) $(CXXFLAGS) -c $<

Received on Fri Nov 18 2005 - 15:59:32 MET