kvm_nextproc(3KVM) Kernel VM Library Functions kvm_nextproc(3KVM)NAME
kvm_nextproc, kvm_getproc, kvm_setproc - read system process structures
SYNOPSIS
cc [ flag... ] file... -lkvm [ library...]
#include <kvm.h>
#include <sys/param.h>
#include <sys/time.h>
#include <sys/proc.h>
struct proc *kvm_nextproc(kvm_t *kd);
int kvm_setproc(kvm_t *kd);
struct proc *kvm_getproc(kvm_t *kd, pid_t pid);
DESCRIPTION
The kvm_nextproc() function reads sequentially all of the system
process structures from the kernel identified by kd (see
kvm_open(3KVM)). Each call to kvm_nextproc() returns a pointer to the
static memory area that contains a copy of the next valid process table
entry. There is no guarantee that the data will remain valid across
calls to kvm_nextproc(), kvm_setproc(), or kvm_getproc(). If the
process structure must be saved, it should be copied to non-volatile
storage.
For performance reasons, many implementations will cache a set of sys‐
tem process structures. Since the system state is liable to change
between calls to kvm_nextproc(), and since the cache may contain obso‐
lete information, there is no guarantee that every process structure
returned refers to an active process, nor is it certain that all pro‐
cesses will be reported.
The kvm_setproc() function rewinds the process list, enabling
kvm_nextproc() to rescan from the beginning of the system process ta‐
ble. This function will always flush the process structure cache,
allowing an application to re-scan the process table of a running sys‐
tem.
The kvm_getproc() function locates the proc structure of the process
specified by pid and returns a pointer to it. Although this function
does not interact with the process table pointer manipulated by
kvm_nextproc(), the restrictions regarding the validity of the data
still apply.
RETURN VALUES
On success, kvm_nextproc() returns a pointer to a copy of the next
valid process table entry. On failure, it returns NULL.
On success, kvm_getproc() returns a pointer to the proc structure of
the process specified by pid. On failure, it returns NULL.
The kvm_setproc() function returns 0 on success and −1 on failure.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│Interface Stability │Committed │
├─────────────────────────────┼─────────────────────────────┤
│MT-Level │Unsafe │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOkvm_getu(3KVM), kvm_open(3KVM), kvm_kread(3KVM), attributes(5)SunOS 5.11 2 May 2002 kvm_nextproc(3KVM)