Optimize the file descriptor cleanup on OSX

Signed-off-by: George Bosilca <[email protected]>
Signed-off-by: Jeff Squyres <[email protected]>

Author: bosilca

src/mca/pfexec/linux/pfexec_linux.c

@@ -2,7 +2,7 @@
  * Copyright (c) 2004-2007 The Trustees of Indiana University and Indiana
  *                         University Research and Technology
  *                         Corporation.  All rights reserved.
- * Copyright (c) 2004-2008 The University of Tennessee and The University
+ * Copyright (c) 2004-2022 The University of Tennessee and The University
  *                         of Tennessee Research Foundation.  All rights
  *                         reserved.
  * Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
@@ -301,7 +301,11 @@ static void send_error_show_help(int fd, int exit_status, const char *file, cons
    the pipe up to the parent, and the keepalive pipe. */
 static int close_open_file_descriptors(int write_fd, int keepalive)
 {
+#if defined(__OSX__)
+    DIR *dir = opendir("/dev/fd");
+#else  /* Linux */
     DIR *dir = opendir("/proc/self/fd");
+#endif  /* defined(__OSX__) */
     if (NULL == dir) {
         return PMIX_ERR_FILE_OPEN_FAILURE;
     }

src/util/pmix_fd.c

@@ -5,6 +5,9 @@
  * Copyright (c) 2015      Research Organization for Information Science
  *                         and Technology (RIST). All rights reserved.
  * Copyright (c) 2021-2022 Nanook Consulting.  All rights reserved.
+ * Copyright (c) 2022      The University of Tennessee and The University
+ *                         of Tennessee Research Foundation.  All rights
+ *                         reserved.
  * $COPYRIGHT$
  *
  * Additional copyrights may follow
@@ -201,7 +204,11 @@ static int fdmax = -1;
  and the pipe up to the parent. */
 void pmix_close_open_file_descriptors(int protected_fd)
 {
+#if defined(__OSX__)
+    DIR *dir = opendir("/dev/fd");
+#else  /* Linux */
     DIR *dir = opendir("/proc/self/fd");
+#endif  /* defined(__OSX__) */
     struct dirent *files;
     int dir_scan_fd = -1;