[Bug 215769] man 2 vfork() does not document corner case when PID == 1

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https://bugzilla.kernel.org/show_bug.cgi?id=215769

--- Comment #4 from Коренберг Марк (socketpair@xxxxxxxxx) ---
#define _GNU_SOURCE 1
#include <stdio.h>
#include <sched.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <err.h>

#ifndef CLONE_NEWTIME
#define CLONE_NEWTIME   0x00000080
#endif

int main (void)
{
  if (unshare (CLONE_NEWTIME))  err (EXIT_FAILURE, "UNSHARE_NEWTIME");

  pid_t pid;
  switch (pid=vfork ())
  {
  case 0:
    _exit(0);
  case -1:
    err(EXIT_FAILURE, "vfork BUG");
  default:
    waitpid(pid, NULL, 0);
  }
  return 0;
}

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