KINFO_GETALLPROC(3) BSD Library Functions Manual KINFO_GETALLPROC(3)NAME
kinfo_getallproc -- function for getting process information of all processes from kernel
LIBRARY
System Utilities Library (libutil, -lutil)
SYNOPSIS
#include <sys/types.h>
#include <libutil.h>
struct kinfo_proc *
kinfo_getallproc(int *cntp);
DESCRIPTION
This function is used for obtaining process information of all processes from the kernel.
The cntp field is a pointer containing the number of process structures returned. This function is a wrapper around sysctl(3) with the
KERN_PROC_PROC mib. While the kernel returns a packed structure, this function expands the data into a fixed record format.
RETURN VALUES
On success the kinfo_getallproc() function returns a pointer to cntp struct kinfo_proc structures as defined by <sys/user.h>. The pointer
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_getallproc()
function returns NULL.
SEE ALSO free(3), malloc(3), sysctl(3)BSD July 9, 2009 BSD
Check Out this Related Man Page
KVM_GETPROCS(3) BSD Library Functions Manual KVM_GETPROCS(3)NAME
kvm_getprocs, kvm_getargv, kvm_getenvv -- access user process state
LIBRARY
Kernel Data Access Library (libkvm, -lkvm)
SYNOPSIS
#include <kvm.h>
#include <sys/param.h>
#include <sys/sysctl.h>
#include <sys/user.h>
struct kinfo_proc *
kvm_getprocs(kvm_t *kd, int op, int arg, int *cnt);
char **
kvm_getargv(kvm_t *kd, const struct kinfo_proc *p, int nchr);
char **
kvm_getenvv(kvm_t *kd, const struct kinfo_proc *p, int nchr);
DESCRIPTION
The kvm_getprocs() function returns a (sub-)set of active processes in the kernel indicated by kd. The op and arg arguments constitute a
predicate which limits the set of processes returned. The value of op describes the filtering predicate as follows:
KERN_PROC_ALL all processes and kernel visible threads
KERN_PROC_PROC all processes, without threads
KERN_PROC_PID processes with process ID arg
KERN_PROC_PGRP processes with process group arg
KERN_PROC_SESSION processes with session arg
KERN_PROC_TTY processes with TTY arg
KERN_PROC_UID processes with effective user ID arg
KERN_PROC_RUID processes with real user ID arg
KERN_PROC_INC_THREAD modifier to return all kernel visible threads when filtering by process ID, process group, TTY, user ID, and real
user ID
The number of processes found is returned in the reference parameter cnt. The processes are returned as a contiguous array of kinfo_proc
structures. This memory is locally allocated, and subsequent calls to kvm_getprocs() and kvm_close() will overwrite this storage.
The kvm_getargv() function returns a null-terminated argument vector that corresponds to the command line arguments passed to process indi-
cated by p. Most likely, these arguments correspond to the values passed to exec(3) on process creation. This information is, however,
deliberately under control of the process itself. Note that the original command name can be found, unaltered, in the p_comm field of the
process structure returned by kvm_getprocs().
The nchr argument indicates the maximum number of characters, including null bytes, to use in building the strings. If this amount is
exceeded, the string causing the overflow is truncated and the partial result is returned. This is handy for programs like ps(1) and w(1)
that print only a one line summary of a command and should not copy out large amounts of text only to ignore it. If nchr is zero, no limit
is imposed and all argument strings are returned in their entirety.
The memory allocated to the argv pointers and string storage is owned by the kvm library. Subsequent kvm_getprocs() and kvm_close(3) calls
will clobber this storage.
The kvm_getenvv() function is similar to kvm_getargv() but returns the vector of environment strings. This data is also alterable by the
process.
RETURN VALUES
The kvm_getprocs(), kvm_getargv(), and kvm_getenvv() functions return NULL on failure.
SEE ALSO kvm(3), kvm_close(3), kvm_geterr(3), kvm_nlist(3), kvm_open(3), kvm_openfiles(3), kvm_read(3), kvm_write(3)BUGS
These routines do not belong in the kvm interface.
BSD November 22, 2011 BSD