1 /*-------------------------------------------------------------------------
2 *
3 * getrusage.c
4 * get information about resource utilisation
5 *
6 * Portions Copyright (c) 1996-2018, 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
getrusage(int who,struct rusage * rusage)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 }
111