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Command: kinfo_getvmmap | Section: 3 | Source: FreeBSD | File: kinfo_getvmmap.3.gz
KINFO_GETVMMAP(3) FreeBSD Library Functions Manual KINFO_GETVMMAP(3)
NAME
kinfo_getvmmap - function for getting per-process memory map information
LIBRARY
System Utilities Library (libutil, -lutil)
SYNOPSIS
#include <sys/types.h>
#include <sys/user.h>
#include <libutil.h>
struct kinfo_vmentry *
kinfo_getvmmap(pid_t pid, int *cntp);
DESCRIPTION
This function is used for obtaining virtual memory mapping information of
a particular process.
The pid field contains the process identifier. This should be the a
process that you have privilege to access. The cntp field is allows the
caller to know how many records are returned.
This function is a wrapper around sysctl(3) with the KERN_PROC_VMMAP mib.
While the kernel returns a packed structure, this function expands the
data into a fixed record format.
RETURN VALUES
On success the kinfo_getvmmap() function returns a pointer to an array of
struct kinfo_vmentry structures as defined by <sys/user.h>. The array
was obtained by an internal call to malloc(3) and must be freed by the
caller with a call to free(3). On failure the kinfo_getvmmap() function
returns NULL.
SEE ALSO
free(3), kinfo_getfile(3), malloc(3)
HISTORY
The kinfo_getvmmap() function first appeared in FreeBSD 7.0.
CAVEATS
kinfo_getvmmap() calls can cause significant CPU consumption because
calculating the residency counts requires iterating over all memory pages
of the process. Setting the sysctl variable
kern.proc_vmmap_skip_resident_count to 1 prevents this calculation.
FreeBSD 14.1-RELEASE-p8 May 10, 2020 FreeBSD 14.1-RELEASE-p8