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/* Copyright (C) 1991-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <stddef.h>
#include <sys/resource.h>
#include <shlib-compat.h>
#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_33)
/* Granularity of the `vm_utime' and `vm_stime' fields of a `struct vtimes'.
(This is the frequency of the machine's power supply, in Hz.) */
# define VTIMES_UNITS_PER_SECOND 60
struct vtimes
{
/* User time used in units of 1/VTIMES_UNITS_PER_SECOND seconds. */
int vm_utime;
/* System time used in units of 1/VTIMES_UNITS_PER_SECOND seconds. */
int vm_stime;
/* Amount of data and stack memory used (kilobyte-seconds). */
unsigned int vm_idsrss;
/* Amount of text memory used (kilobyte-seconds). */
unsigned int vm_ixrss;
/* Maximum resident set size (text, data, and stack) (kilobytes). */
int vm_maxrss;
/* Number of hard page faults (i.e. those that required I/O). */
int vm_majflt;
/* Number of soft page faults (i.e. those serviced by reclaiming
a page from the list of pages awaiting reallocation. */
int vm_minflt;
/* Number of times a process was swapped out of physical memory. */
int vm_nswap;
/* Number of input operations via the file system. Note: This
and `ru_oublock' do not include operations with the cache. */
int vm_inblk;
/* Number of output operations via the file system. */
int vm_oublk;
};
/* Return the number of 1/VTIMES_UNITS_PER_SECOND-second
units in the `struct timeval' TV. */
# define TIMEVAL_TO_VTIMES(tv) \
((tv.tv_sec * VTIMES_UNITS_PER_SECOND) \
+ (tv.tv_usec * VTIMES_UNITS_PER_SECOND / 1000000))
/* If VT is not NULL, write statistics for WHO into *VT.
Return 0 for success, -1 for failure. */
static int
vtimes_one (struct vtimes *vt, enum __rusage_who who)
{
if (vt != NULL)
{
struct rusage usage;
if (__getrusage (who, &usage) < 0)
return -1;
vt->vm_utime = TIMEVAL_TO_VTIMES (usage.ru_utime);
vt->vm_stime = TIMEVAL_TO_VTIMES (usage.ru_stime);
vt->vm_idsrss = usage.ru_idrss + usage.ru_isrss;
vt->vm_majflt = usage.ru_majflt;
vt->vm_minflt = usage.ru_minflt;
vt->vm_nswap = usage.ru_nswap;
vt->vm_inblk = usage.ru_inblock;
vt->vm_oublk = usage.ru_oublock;
}
return 0;
}
/* If CURRENT is not NULL, write statistics for the current process into
*CURRENT. If CHILD is not NULL, write statistics for all terminated child
processes into *CHILD. Returns 0 for success, -1 for failure. */
int
__vtimes (struct vtimes *current, struct vtimes *child)
{
if (vtimes_one (current, RUSAGE_SELF) < 0
|| vtimes_one (child, RUSAGE_CHILDREN) < 0)
return -1;
return 0;
}
compat_symbol (libc, __vtimes, vtimes, GLIBC_2_0);
#endif /* SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_33) */
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