3665 Implement O_CLOEXEC as an open() flag
Reviewed by: Robert Mustacchi <rm@joyent.com>
Reviewed by: Gordon Ross <gwr@nexenta.com>
Reviewed by: Dan McDonald <danmcd@nexenta.com>

*** 25,34 ****
--- 25,37 ----
  
  /*      Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T     */
  /*        All Rights Reserved   */
  
  /*
+  * Copyright (c) 2013, OmniTI Computer Consulting, Inc. All rights reserved.
+  */
+ /*
   * Portions of this source code were derived from Berkeley 4.3 BSD
   * under license from the Regents of the University of California.
   */
  
  #include <sys/param.h>
*** 224,233 ****
--- 227,239 ----
                                          /*
                                           * We must now fill in the slot
                                           * falloc reserved.
                                           */
                                          setf(fd, fp);
+                                         if ((filemode & FCLOEXEC) != 0) {
+                                                 f_setfd(fd, FD_CLOEXEC);
+                                         }
                                          return (fd);
                                  } else {
                                          /*
                                           * Special handling for /dev/fd.
                                           * Give up the file pointer
*** 250,259 ****
--- 256,268 ----
                                          }
                                          mutex_enter(&fp->f_tlock);
                                          fp->f_count++;
                                          mutex_exit(&fp->f_tlock);
                                          setf(fd, fp);
+                                         if ((filemode & FCLOEXEC) != 0) {
+                                                 f_setfd(fd, FD_CLOEXEC);
+                                         }
                                          releasef(dupfd);
                                  }
                                  return (fd);
                          } else {
                                  setf(fd, NULL);