emacs-28 855e15dbf1: Fix builds on older versions of macOS

[Mattias Engdegård]

branch: emacs-28
commit 855e15dbf10a6aac42b860fdb28711f979e2bf22
Author: Mattias Engdegård <mattiase@acm.org>
Commit: Mattias Engdegård <mattiase@acm.org>

    Fix builds on older versions of macOS
    
    This adds back macOS-specific code replaced earlier (bug#48548),
    specifically to fix build errors on macOS 10.7.5.  See discussion at
    https://lists.gnu.org/archive/html/emacs-devel/2022-04/msg00779.html .
    
    * src/sysdep.c (HAVE_RUSAGE_INFO_CURRENT, HAVE_PROC_PIDINFO): New.
    (system_process_attributes): Use alternative code or exclude features
    when building on older macOS versions.
---
 src/sysdep.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/src/sysdep.c b/src/sysdep.c
index 1e630835ad..f6d7d3920b 100644
--- a/src/sysdep.c
+++ b/src/sysdep.c
@@ -4027,6 +4027,9 @@ system_process_attributes (Lisp_Object pid)
 
 #elif defined DARWIN_OS
 
+#define HAVE_RUSAGE_INFO_CURRENT (MAC_OS_X_VERSION_MIN_REQUIRED >= 101000)
+#define HAVE_PROC_PIDINFO (MAC_OS_X_VERSION_MIN_REQUIRED >= 1050)
+
 Lisp_Object
 system_process_attributes (Lisp_Object pid)
 {
@@ -4130,6 +4133,7 @@ system_process_attributes (Lisp_Object pid)
   attrs = Fcons (Fcons (Qtpgid, INT_TO_INTEGER (proc.kp_eproc.e_tpgid)),
                 attrs);
 
+#if HAVE_RUSAGE_INFO_CURRENT
   rusage_info_current ri;
   if (proc_pid_rusage(proc_id, RUSAGE_INFO_CURRENT, (rusage_info_t *) &ri) == 
0)
     {
@@ -4143,6 +4147,24 @@ system_process_attributes (Lisp_Object pid)
 
       attrs = Fcons (Fcons (Qmajflt, INT_TO_INTEGER (ri.ri_pageins)), attrs);
   }
+#else  /* !HAVE_RUSAGE_INFO_CURRENT */
+  struct rusage *rusage = proc.kp_proc.p_ru;
+  if (rusage)
+    {
+      attrs = Fcons (Fcons (Qminflt, INT_TO_INTEGER (rusage->ru_minflt)),
+                    attrs);
+      attrs = Fcons (Fcons (Qmajflt, INT_TO_INTEGER (rusage->ru_majflt)),
+                    attrs);
+
+      attrs = Fcons (Fcons (Qutime, make_lisp_timeval (rusage->ru_utime)),
+                    attrs);
+      attrs = Fcons (Fcons (Qstime, make_lisp_timeval (rusage->ru_stime)),
+                    attrs);
+      struct timespec t = timespec_add (timeval_to_timespec (rusage->ru_utime),
+                                       timeval_to_timespec (rusage->ru_stime));
+      attrs = Fcons (Fcons (Qtime, make_lisp_time (t)), attrs);
+    }
+#endif  /* !HAVE_RUSAGE_INFO_CURRENT */
 
   starttime = proc.kp_proc.p_starttime;
   attrs = Fcons (Fcons (Qnice,  make_fixnum (proc.kp_proc.p_nice)), attrs);
@@ -4152,6 +4174,7 @@ system_process_attributes (Lisp_Object pid)
   t = timespec_sub (now, timeval_to_timespec (starttime));
   attrs = Fcons (Fcons (Qetime, make_lisp_time (t)), attrs);
 
+#if HAVE_PROC_PIDINFO
   struct proc_taskinfo taskinfo;
   if (proc_pidinfo (proc_id, PROC_PIDTASKINFO, 0, &taskinfo, sizeof 
(taskinfo)) > 0)
     {
@@ -4159,6 +4182,7 @@ system_process_attributes (Lisp_Object pid)
       attrs = Fcons (Fcons (Qrss, make_fixnum (taskinfo.pti_resident_size / 
1024)), attrs);
       attrs = Fcons (Fcons (Qthcount, make_fixnum (taskinfo.pti_threadnum)), 
attrs);
     }
+#endif /* HAVE_PROC_PIDINFO */
 
 #ifdef KERN_PROCARGS2
   char args[ARG_MAX];