1/* Copyright (C) 1991-2023 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18#include <stddef.h>
19#include <sys/resource.h>
20#include <shlib-compat.h>
21
22#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_33)
23
24/* Granularity of the `vm_utime' and `vm_stime' fields of a `struct vtimes'.
25 (This is the frequency of the machine's power supply, in Hz.) */
26# define VTIMES_UNITS_PER_SECOND 60
27
28struct vtimes
29{
30 /* User time used in units of 1/VTIMES_UNITS_PER_SECOND seconds. */
31 int vm_utime;
32 /* System time used in units of 1/VTIMES_UNITS_PER_SECOND seconds. */
33 int vm_stime;
34
35 /* Amount of data and stack memory used (kilobyte-seconds). */
36 unsigned int vm_idsrss;
37 /* Amount of text memory used (kilobyte-seconds). */
38 unsigned int vm_ixrss;
39 /* Maximum resident set size (text, data, and stack) (kilobytes). */
40 int vm_maxrss;
41
42 /* Number of hard page faults (i.e. those that required I/O). */
43 int vm_majflt;
44 /* Number of soft page faults (i.e. those serviced by reclaiming
45 a page from the list of pages awaiting reallocation. */
46 int vm_minflt;
47
48 /* Number of times a process was swapped out of physical memory. */
49 int vm_nswap;
50
51 /* Number of input operations via the file system. Note: This
52 and `ru_oublock' do not include operations with the cache. */
53 int vm_inblk;
54 /* Number of output operations via the file system. */
55 int vm_oublk;
56};
57
58/* Return the number of 1/VTIMES_UNITS_PER_SECOND-second
59 units in the `struct timeval' TV. */
60# define TIMEVAL_TO_VTIMES(tv) \
61 ((tv.tv_sec * VTIMES_UNITS_PER_SECOND) \
62 + (tv.tv_usec * VTIMES_UNITS_PER_SECOND / 1000000))
63
64/* If VT is not NULL, write statistics for WHO into *VT.
65 Return 0 for success, -1 for failure. */
66static int
67vtimes_one (struct vtimes *vt, enum __rusage_who who)
68{
69 if (vt != NULL)
70 {
71 struct rusage usage;
72
73 if (__getrusage (who, &usage) < 0)
74 return -1;
75
76 vt->vm_utime = TIMEVAL_TO_VTIMES (usage.ru_utime);
77 vt->vm_stime = TIMEVAL_TO_VTIMES (usage.ru_stime);
78 vt->vm_idsrss = usage.ru_idrss + usage.ru_isrss;
79 vt->vm_majflt = usage.ru_majflt;
80 vt->vm_minflt = usage.ru_minflt;
81 vt->vm_nswap = usage.ru_nswap;
82 vt->vm_inblk = usage.ru_inblock;
83 vt->vm_oublk = usage.ru_oublock;
84 }
85 return 0;
86}
87
88/* If CURRENT is not NULL, write statistics for the current process into
89 *CURRENT. If CHILD is not NULL, write statistics for all terminated child
90 processes into *CHILD. Returns 0 for success, -1 for failure. */
91int
92__vtimes (struct vtimes *current, struct vtimes *child)
93{
94 if (vtimes_one (current, RUSAGE_SELF) < 0
95 || vtimes_one (child, RUSAGE_CHILDREN) < 0)
96 return -1;
97 return 0;
98}
99compat_symbol (libc, __vtimes, vtimes, GLIBC_2_0);
100
101#endif /* SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_33) */
102