[newlib-cygwin] get and convert boot time once and use as needed

[Corinna Vinschen]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=23bb2f660807bbc7321a143fa35ce659d79ba245

commit 23bb2f660807bbc7321a143fa35ce659d79ba245
Author: Brian Inglis <brian.ing...@systematicsw.ab.ca>
Date:   Sat Mar 23 20:22:39 2019 -0600

    get and convert boot time once and use as needed

Diff:
---
 winsup/utils/ps.cc | 25 ++++++++++++++++---------
 1 file changed, 16 insertions(+), 9 deletions(-)

diff --git a/winsup/utils/ps.cc b/winsup/utils/ps.cc
index c81805a..75a91f5 100644
--- a/winsup/utils/ps.cc
+++ b/winsup/utils/ps.cc
@@ -164,6 +164,7 @@ main (int argc, char *argv[])
   const char *lfmt   = "%c %7d %7d %7d %10u %4s %8u %8s %s\n";
   char ch;
   void *drive_map = NULL;
+  time_t boot_time = -1;
 
   aflag = lflag = fflag = sflag = 0;
   uid = getuid ();
@@ -237,9 +238,12 @@ main (int argc, char *argv[])
 
   if (query == CW_GETPINFO_FULL)
     {
+      HANDLE tok;
+      NTSTATUS status;
+      SYSTEM_TIMEOFDAY_INFORMATION stodi;
+
       /* Enable debug privilege to allow to enumerate all processes,
         not only processes in current session. */
-      HANDLE tok;
       if (OpenProcessToken (GetCurrentProcess (),
                            TOKEN_QUERY | TOKEN_ADJUST_PRIVILEGES,
                            &tok))
@@ -256,6 +260,15 @@ main (int argc, char *argv[])
        }
 
       drive_map = (void *) cygwin_internal (CW_ALLOC_DRIVE_MAP);
+
+      /* Get system boot time to default process start time */
+      status = NtQuerySystemInformation (SystemTimeOfDayInformation,
+                               (PVOID) &stodi, sizeof stodi, NULL);
+      if (!NT_SUCCESS (status))
+       fprintf (stderr,
+               "NtQuerySystemInformation(SystemTimeOfDayInformation), "
+                               "status %#010x\n", status);
+      boot_time = to_time_t ((FILETIME*)&stodi.BootTime);
     }
 
   for (int pid = 0;
@@ -337,16 +350,10 @@ main (int argc, char *argv[])
                p->start_time = to_time_t (&ct);
              CloseHandle (h);
            }
+         /* Default to boot time when process start time inaccessible, 0, -1 */
          if (!h || 0 == p->start_time || -1 == p->start_time)
            {
-             SYSTEM_TIMEOFDAY_INFORMATION stodi;
-             status = NtQuerySystemInformation (SystemTimeOfDayInformation,
-                                       (PVOID) &stodi, sizeof stodi, NULL);
-             if (!NT_SUCCESS (status))
-               fprintf (stderr,
-                       "NtQuerySystemInformation(SystemTimeOfDayInformation), "
-                                       "status %08x", status);
-             p->start_time = to_time_t ((FILETIME*)&stodi.BootTime);
+             p->start_time = boot_time;
            }
        }