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getrusage.c
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1 /*-------------------------------------------------------------------------
2  *
3  * getrusage.c
4  * get information about resource utilisation
5  *
6  * Portions Copyright (c) 1996-2017, PostgreSQL Global Development Group
7  * Portions Copyright (c) 1994, Regents of the University of California
8  *
9  *
10  * IDENTIFICATION
11  * src/port/getrusage.c
12  *
13  *-------------------------------------------------------------------------
14  */
15 
16 #include "c.h"
17 
18 #include "rusagestub.h"
19 
20 /* This code works on:
21  * solaris_i386
22  * solaris_sparc
23  * hpux 9.*
24  * win32
25  * which currently is all the supported platforms that don't have a
26  * native version of getrusage(). So, if configure decides to compile
27  * this file at all, we just use this version unconditionally.
28  */
29 
30 int
31 getrusage(int who, struct rusage *rusage)
32 {
33 #ifdef WIN32
34  FILETIME starttime;
35  FILETIME exittime;
36  FILETIME kerneltime;
37  FILETIME usertime;
38  ULARGE_INTEGER li;
39 
40  if (who != RUSAGE_SELF)
41  {
42  /* Only RUSAGE_SELF is supported in this implementation for now */
43  errno = EINVAL;
44  return -1;
45  }
46 
47  if (rusage == (struct rusage *) NULL)
48  {
49  errno = EFAULT;
50  return -1;
51  }
52  memset(rusage, 0, sizeof(struct rusage));
53  if (GetProcessTimes(GetCurrentProcess(),
54  &starttime, &exittime, &kerneltime, &usertime) == 0)
55  {
56  _dosmaperr(GetLastError());
57  return -1;
58  }
59 
60  /* Convert FILETIMEs (0.1 us) to struct timeval */
61  memcpy(&li, &kerneltime, sizeof(FILETIME));
62  li.QuadPart /= 10L; /* Convert to microseconds */
63  rusage->ru_stime.tv_sec = li.QuadPart / 1000000L;
64  rusage->ru_stime.tv_usec = li.QuadPart % 1000000L;
65 
66  memcpy(&li, &usertime, sizeof(FILETIME));
67  li.QuadPart /= 10L; /* Convert to microseconds */
68  rusage->ru_utime.tv_sec = li.QuadPart / 1000000L;
69  rusage->ru_utime.tv_usec = li.QuadPart % 1000000L;
70 #else /* all but WIN32 */
71 
72  struct tms tms;
73  int tick_rate = CLK_TCK; /* ticks per second */
74  clock_t u,
75  s;
76 
77  if (rusage == (struct rusage *) NULL)
78  {
79  errno = EFAULT;
80  return -1;
81  }
82  if (times(&tms) < 0)
83  {
84  /* errno set by times */
85  return -1;
86  }
87  switch (who)
88  {
89  case RUSAGE_SELF:
90  u = tms.tms_utime;
91  s = tms.tms_stime;
92  break;
93  case RUSAGE_CHILDREN:
94  u = tms.tms_cutime;
95  s = tms.tms_cstime;
96  break;
97  default:
98  errno = EINVAL;
99  return -1;
100  }
101 #define TICK_TO_SEC(T, RATE) ((T)/(RATE))
102 #define TICK_TO_USEC(T,RATE) (((T)%(RATE)*1000000)/RATE)
103  rusage->ru_utime.tv_sec = TICK_TO_SEC(u, tick_rate);
104  rusage->ru_utime.tv_usec = TICK_TO_USEC(u, tick_rate);
105  rusage->ru_stime.tv_sec = TICK_TO_SEC(s, tick_rate);
106  rusage->ru_stime.tv_usec = TICK_TO_USEC(u, tick_rate);
107 #endif /* WIN32 */
108 
109  return 0;
110 }
int getrusage(int who, struct rusage *rusage)
Definition: getrusage.c:31
#define RUSAGE_CHILDREN
Definition: rusagestub.h:24
struct timeval ru_stime
Definition: rusagestub.h:29
static char * times[]
#define TICK_TO_USEC(T, RATE)
struct timeval ru_utime
Definition: rusagestub.h:28
#define RUSAGE_SELF
Definition: rusagestub.h:23
void _dosmaperr(unsigned long)
Definition: win32error.c:171
#define TICK_TO_SEC(T, RATE)