Merge from emacs-26

e62ad04963 Fix sgml-mode handling of quotes within parens (Bug#36347)
06b35b2f92 ; * lisp/frame.el: Enhance add-variable-watcher commentary.
572e34bb6f Rename 'make-symbolic-link' argument NEWNAME to LINKNAME
04477adedc Check that length of data returned by sysctl is non-zero
81535eeadb * test/lisp/progmodes/python-tests.el (python-virt-bin): D...
9d48979ca8 Fix Python tests depending on system-type
fcf6cc3177 Fix problem with wdired test when symlinks cannot be created.
4701e0663e Improve wording of documentation of click events

# Conflicts:
#	lisp/textmodes/sgml-mode.el
#	test/lisp/textmodes/sgml-mode-tests.el

3 files changed, 11 insertions, 11 deletions

diff --git a/src/fileio.c b/src/fileio.c
index 5dd14daacb4..0da9894a73a 100644
--- a/src/fileio.c
+++ b/src/fileio.c
@@ -2599,13 +2599,13 @@ This is what happens in interactive use with M-x.  */)
 
 DEFUN ("make-symbolic-link", Fmake_symbolic_link, Smake_symbolic_link, 2, 3,
        "FMake symbolic link to file: \nGMake symbolic link to file %s: \np",
-       doc: /* Make a symbolic link to TARGET, named NEWNAME.
-If NEWNAME is a directory name, make a like-named symbolic link under
-NEWNAME.
+       doc: /* Make a symbolic link to TARGET, named LINKNAME.
+If LINKNAME is a directory name, make a like-named symbolic link under
+LINKNAME.
 
-Signal a `file-already-exists' error if a file NEWNAME already exists
+Signal a `file-already-exists' error if a file LINKNAME already exists
 unless optional third argument OK-IF-ALREADY-EXISTS is non-nil.
-An integer third arg means request confirmation if NEWNAME already
+An integer third arg means request confirmation if LINKNAME already
 exists, and expand leading "~" or strip leading "/:" in TARGET.
 This happens for interactive use with M-x.  */)
   (Lisp_Object target, Lisp_Object linkname, Lisp_Object ok_if_already_exists)
diff --git a/src/filelock.c b/src/filelock.c
index baf87b7f635..b1f7d9dce61 100644
--- a/src/filelock.c
+++ b/src/filelock.c
@@ -152,7 +152,7 @@ get_boot_time (void)
     mib[1] = KERN_BOOTTIME;
     size = sizeof (boottime_val);
 
-    if (sysctl (mib, 2, &boottime_val, &size, NULL, 0) >= 0)
+    if (sysctl (mib, 2, &boottime_val, &size, NULL, 0) >= 0 && size != 0)
       {
         boot_time = boottime_val.tv_sec;
         return boot_time;
diff --git a/src/sysdep.c b/src/sysdep.c
index f7fc99f147f..4f89e8aba10 100644
--- a/src/sysdep.c
+++ b/src/sysdep.c
@@ -3018,11 +3018,11 @@ list_system_processes (void)
 
   Lisp_Object proclist = Qnil;
 
-  if (sysctl (mib, 3, NULL, &len, NULL, 0) != 0)
+  if (sysctl (mib, 3, NULL, &len, NULL, 0) != 0 || len == 0)
     return proclist;
 
   procs = xmalloc (len);
-  if (sysctl (mib, 3, procs, &len, NULL, 0) != 0)
+  if (sysctl (mib, 3, procs, &len, NULL, 0) != 0 || len == 0)
     {
       xfree (procs);
       return proclist;
@@ -3616,7 +3616,7 @@ system_process_attributes (Lisp_Object pid)
   CONS_TO_INTEGER (pid, int, proc_id);
   mib[3] = proc_id;
 
-  if (sysctl (mib, 4, &proc, &proclen, NULL, 0) != 0)
+  if (sysctl (mib, 4, &proc, &proclen, NULL, 0) != 0 || proclen == 0)
     return attrs;
 
   attrs = Fcons (Fcons (Qeuid, INT_TO_INTEGER (proc.ki_uid)), attrs);
@@ -3739,7 +3739,7 @@ system_process_attributes (Lisp_Object pid)
 
   mib[2] = KERN_PROC_ARGS;
   len = MAXPATHLEN;
-  if (sysctl (mib, 4, args, &len, NULL, 0) == 0)
+  if (sysctl (mib, 4, args, &len, NULL, 0) == 0 && len != 0)
     {
       int i;
       for (i = 0; i < len; i++)
@@ -3785,7 +3785,7 @@ system_process_attributes (Lisp_Object pid)
   CONS_TO_INTEGER (pid, int, proc_id);
   mib[3] = proc_id;
 
-  if (sysctl (mib, 4, &proc, &proclen, NULL, 0) != 0)
+  if (sysctl (mib, 4, &proc, &proclen, NULL, 0) != 0 || proclen == 0)
     return attrs;
 
   uid = proc.kp_eproc.e_ucred.cr_uid;