src/os/linux/vm/os_linux.cpp

*** 1,7 ****
  /*
!  * Copyright (c) 1999, 2018, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.
--- 1,7 ----
  /*
!  * Copyright (c) 1999, 2019, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.
*** 6335,6348 ****
  
  // Run the specified command in a separate process. Return its exit value,
  // or -1 on failure (e.g. can't fork a new process).
  // Unlike system(), this function can be called from signal handler. It
  // doesn't block SIGINT et al.
! int os::fork_and_exec(char* cmd) {
    const char * argv[4] = {"sh", "-c", cmd, NULL};
  
!   pid_t pid = fork();
  
    if (pid < 0) {
      // fork failed
      return -1;
  
--- 6335,6354 ----
  
  // Run the specified command in a separate process. Return its exit value,
  // or -1 on failure (e.g. can't fork a new process).
  // Unlike system(), this function can be called from signal handler. It
  // doesn't block SIGINT et al.
! int os::fork_and_exec(char* cmd, bool use_vfork_if_available) {
    const char * argv[4] = {"sh", "-c", cmd, NULL};
  
!   pid_t pid ;
! 
!   if (use_vfork_if_available) {
!     pid = vfork();
!   } else {
!     pid = fork();
!   }
  
    if (pid < 0) {
      // fork failed
      return -1;