Call process C/C++ problem

Hi,

I have a problem about how I can call processes in C/C++.

My task is to develop a source-code that run 5 commands.

So, I'm running Kubuntu 7.04 and my source-code is below:

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "abevo.h"
#include "smalloc.h"

int main ()
{

  printf ("Checking if processor is available...\n"); 

  char* path;
  char* pathExecpdb2gmx;
  char* pathExeceditconf;
  char* pathExecgenbox;
  char* pathExecgrompp;
  char* pathExecmdrun;

  int ret;
  char *Param_pdb2gmx[] = { "pdb2gmx", "-f", "cpeptide.pdb", "-o", "cpeptide.gro", "-p", "cpeptide.top",(char *)0 };
  char *Param_editconf[] = { "editconf", "-f", "cpeptide.gro", "-o", "cpeptide.gro", "-d", "0.5",(char *)0 };
  char *Param_genbox[] = { "genbox", "-cp", "cpeptide.gro", "-cs", "-o", "cpeptide_b4em.gro", "-p", "cpeptide.top",(char *)0 };
  char *Param_grompp[] = { "grompp", "-f", "em.mdp", "-c", "cpeptide.gro", "-p", "cpeptide.top", "-o", "cpeptide_b4em.tpr", (char *)0 }; //cpeptide_b4em.gro
   char *Param_mdrun[] = { "mdrun", "-nice", "4", "-s", "cpeptide_em", "-o", "cpeptide_em", "-c", "cpeptide_b4pr","-v", (char *)0 };

  //leParametro("parameters.txt");

  //CRIA AS VARIƁVEIS
  snew(path,60);
  snew(pathExecpdb2gmx,100);
  snew(pathExeceditconf,100);
  snew(pathExecgenbox,100);
  snew(pathExecgrompp,100);
  snew(pathExecmdrun,100);


  path = "/home/faccioli/Projects/AbevoGROMACS_TESTE/";//retornaParametro("pathExec");

  int processos;
  int child = 0;

  processos = 0;
  while (processos <= 5) //COLOCAR A QTDE DE PROCESSOS QUE DEVEM SER EXECUTADOS
  {
     if (processos == 0)
     { 
        //pdb2gmx
        child = fork();//cria novo processo
        if (child == 0)
        { 
           strcat(pathExecpdb2gmx,path);

           strcat(pathExecpdb2gmx,"pdb2gmx");
 
           ret = execv (pathExecpdb2gmx, Param_pdb2gmx);
        } else
        {
           wait(child);
           processos++; 

       }
     }

     if (processos == 1)
     {
        //editconf
        child = fork();
        if (child == 0)
        {
           strcat(pathExeceditconf,path);

           strcat(pathExeceditconf,"editconf");

           ret = execv (pathExeceditconf, Param_editconf);

        }else
        {
            wait(child);
            processos++;
        }
     }

     if (processos == 2)
     {
        //genbox
        child = fork();
        if (child == 0)
        {
            strcat(pathExecgenbox,path);   

            strcat(pathExecgenbox,"genbox");

            ret = execv (pathExecgenbox, Param_genbox);
        }else
        {
            wait(child);
            processos++;

        }
     }

     if (processos == 3)
     { 
        //grompp
        child = fork();
        if (child == 0)
        {
            strcat(pathExecgrompp,path);

            strcat(pathExecgrompp,"grompp");

            ret = execv (pathExecgrompp, Param_grompp);
        }else
        {
            wait(child);
            processos++;
        }
     }
     if (processos == 4) 
     {
        //mdrun
        child = fork();
        if (child == 0)
        {
            printf ("COMECANDO O mdrun \n");

            strcat(pathExecmdrun,path);

            strcat(pathExecmdrun,"mdrun");

            ret = execv (pathExecmdrun, Param_mdrun);
        }else
        {
            wait(child);
            processos++;
        }
     } 
  }
  //FIM
  printf ("Fim da execucao !!! \n");
  return 0;
}


The command snew is, only, for allocates memory. The proposal of source-code is call GROMACS program.

However, I don't understand why the third command is executed before the second command. The third command is ret = execv (pathExecgenbox, Param_genbox); and the second command is ret = execv (pathExeceditconf, Param_editconf);.

I thanks for some help.

Regards,

Rodrigo Antonio Faccioli

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