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Date: Tue, 03 Nov 2009 11:58:53 +0100
From: Laurent Najman <l DOT najman AT esiee DOT fr>
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To: cygwin AT cygwin DOT com
Subject: Parenthood seems to be lost when the parent is exeeced
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Hi,

The parenthood seems to be lost when the parent is execed.
Here is a sample code

#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <windows.h>

int main(int argc, char **argv)
{
  int status;
 
  if (argc > 1)   {
    printf ("Execed Parent: Cygwin: %d Windows: %lu \n",
        getpid (), GetCurrentProcessId ());
    wait(NULL);
    printf("Parent has waited its child\n");
    return 0;
  }
  switch (fork ())   {
  case 0: // Child
    sleep(1);
    printf("Child Cygwin: %d Windows: %lu Parent= %d has ended\n",
       getpid (), GetCurrentProcessId (), getppid());
    break;
  default: // Parent
    printf ("Parent : Cygwin: %d Windows: %lu\n",
        getpid (), GetCurrentProcessId (), getppid());
    execl ("./x", "x", "child", NULL);
    break;
  }
  return 0;
}

Here is the execution of the code

Laurent Najman AT PC4354B /cygdrive/d/src/XXX
$ gcc -o x x.c

Laurent Najman AT PC4354B /cygdrive/d/src/XXX
$ ./x
Parent : Cygwin: 4308 Windows: 5080
Execed Parent: Cygwin: 4308 Windows: 4728
Parent has waited its child

Laurent Najman AT PC4354B /cygdrive/d/src/XXX
$ Child Cygwin: 4784 Windows: 4784 Parent= 1 has ended


Normally, I would expect the parent to be 4308, and I would expect that 
parent to wait for its child.
Is this cygwin behavior a normal behavior?

Thanks in advance,
Laurent Najman


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