8364822: Comment cleanup, stale references to closeDescriptors and UNIXProcess.c

Reviewed-by: kevinw, rriggs

src/hotspot/os/aix/os_aix.cpp

@@ -2343,8 +2343,7 @@ int os::open(const char *path, int oflag, int mode) {
   // specifically destined for a subprocess should have the
   // close-on-exec flag set. If we don't set it, then careless 3rd
   // party native code might fork and exec without closing all
-  // appropriate file descriptors (e.g. as we do in closeDescriptors in
-  // UNIXProcess.c), and this in turn might:
+  // appropriate file descriptors, and this in turn might:
   //
   // - cause end-of-file to fail to be detected on some file
   //   descriptors, resulting in mysterious hangs, or

src/hotspot/os/bsd/os_bsd.cpp

@@ -2251,8 +2251,7 @@ int os::open(const char *path, int oflag, int mode) {
   // specifically destined for a subprocess should have the
   // close-on-exec flag set.  If we don't set it, then careless 3rd
   // party native code might fork and exec without closing all
-  // appropriate file descriptors (e.g. as we do in closeDescriptors in
-  // UNIXProcess.c), and this in turn might:
+  // appropriate file descriptors, and this in turn might:
   //
   // - cause end-of-file to fail to be detected on some file
   //   descriptors, resulting in mysterious hangs, or

src/hotspot/os/linux/os_linux.cpp

@@ -4872,9 +4872,8 @@ int os::open(const char *path, int oflag, int mode) {
   // All file descriptors that are opened in the Java process and not
   // specifically destined for a subprocess should have the close-on-exec
   // flag set.  If we don't set it, then careless 3rd party native code
-  // might fork and exec without closing all appropriate file descriptors
-  // (e.g. as we do in closeDescriptors in UNIXProcess.c), and this in
-  // turn might:
+  // might fork and exec without closing all appropriate file descriptors,
+  // and this in turn might:
   //
   // - cause end-of-file to fail to be detected on some file
   //   descriptors, resulting in mysterious hangs, or

src/java.base/unix/native/libjava/childproc.c

@@ -372,7 +372,7 @@ childProcess(void *arg)
     jtregSimulateCrash(0, 6);
 #endif
     /* Close the parent sides of the pipes.
-       Closing pipe fds here is redundant, since closeDescriptors()
+       Closing pipe fds here is redundant, since markDescriptorsCloseOnExec()
        would do it anyways, but a little paranoia is a good thing. */
     if ((closeSafely(p->in[1])   == -1) ||
         (closeSafely(p->out[0])  == -1) ||