Different signal handling under FreeBSD and Linux

Signals Delivery and SA_RESTART:

Under 2.6 i386 Linux at home I have got all of this signals.

Under amd64 FreeBSD I have got only some of them.

That way under FreeBSD there are no warranty on signals delivery.

#include <stdio.h>
#include <signal.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <stdlib.h>
#include <semaphore.h>

const int MAX_CHI=1000;

volatile int chld_count;

sem_t asem;

void handler(int sig)
{
  pid_t pid;
  sem_wait(&asem);
  chld_count ++;
  pid = wait(NULL);

  printf("Pid %d exited. count: %d\n", pid, chld_count);
  sem_post(&asem);
}

int main(void)
{ 
  int i;
  chld_count=0;
  struct sigaction sa;
  sem_init(&asem,0,1);

  signal(SIGCHLD, handler);

  sigemptyset(&sa.sa_mask);
  sa.sa_flags = SA_RESTART;
  sa.sa_handler = handler;
  
  sigaction(SIGCHLD, &sa, NULL);

  for(i=0;i<MAX_CHI;i++)
  {
   int ret_val;
   ret_val=fork();

   if(ret_val==-1)
   {
    perror("fork()"); 
   }
   else if(!ret_val)
   {
    printf("in child;Child pid is %d\n", getpid());
      exit(0);
   }
   else
   {
    printf("Parent pid is %d; child is %d;\n", 
      getpid(),ret_val);
   }
  }

  for(i=0;i<MAX_CHI;i++)
 {
 int wparam;
 wait(&wparam); 
 }

  return 0;
}