src/port/win32getrusage.c

   1 /*-------------------------------------------------------------------------
   2  *
   3  * win32getrusage.c
   4  *        get information about resource utilisation
   5  *
   6  * Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group
   7  * Portions Copyright (c) 1994, Regents of the University of California
   8  *
   9  *
  10  * IDENTIFICATION
  11  *        src/port/win32getrusage.c
  12  *
  13  *-------------------------------------------------------------------------
  14  */
  15
  16 #include "c.h"
  17
  18 #include <sys/resource.h>
  19
  20 int
  21 getrusage(int who, struct rusage *rusage)
  22 {
  23         FILETIME        starttime;
  24         FILETIME        exittime;
  25         FILETIME        kerneltime;
  26         FILETIME        usertime;
  27         ULARGE_INTEGER li;
  28
  29         if (who != RUSAGE_SELF)
  30         {
  31                 /* Only RUSAGE_SELF is supported in this implementation for now */
  32                 errno = EINVAL;
  33                 return -1;
  34         }
  35
  36         if (rusage == (struct rusage *) NULL)
  37         {
  38                 errno = EFAULT;
  39                 return -1;
  40         }
  41         memset(rusage, 0, sizeof(struct rusage));
  42         if (GetProcessTimes(GetCurrentProcess(),
  43                                                 &starttime, &exittime, &kerneltime, &usertime) == 0)
  44         {
  45                 _dosmaperr(GetLastError());
  46                 return -1;
  47         }
  48
  49         /* Convert FILETIMEs (0.1 us) to struct timeval */
  50         memcpy(&li, &kerneltime, sizeof(FILETIME));
  51         li.QuadPart /= 10L;                     /* Convert to microseconds */
  52         rusage->ru_stime.tv_sec = li.QuadPart / 1000000L;
  53         rusage->ru_stime.tv_usec = li.QuadPart % 1000000L;
  54
  55         memcpy(&li, &usertime, sizeof(FILETIME));
  56         li.QuadPart /= 10L;                     /* Convert to microseconds */
  57         rusage->ru_utime.tv_sec = li.QuadPart / 1000000L;
  58         rusage->ru_utime.tv_usec = li.QuadPart % 1000000L;
  59
  60         return 0;
  61 }