freebsd-dev/lib/libutil/kinfo_getproc.3
Stanislav Sedov 0daf62d9f5 - Commit work from libprocstat project. These patches add support for runtime
file and processes information retrieval from the running kernel via sysctl
  in the form of new library, libprocstat.  The library also supports KVM backend
  for analyzing memory crash dumps.  Both procstat(1) and fstat(1) utilities have
  been modified to take advantage of the library (as the bonus point the fstat(1)
  utility no longer need superuser privileges to operate), and the procstat(1)
  utility is now able to display information from memory dumps as well.

  The newly introduced fuser(1) utility also uses this library and able to operate
  via sysctl and kvm backends.

  The library is by no means complete (e.g. KVM backend is missing vnode name
  resolution routines, and there're no manpages for the library itself) so I
  plan to improve it further.  I'm commiting it so it will get wider exposure
  and review.

  We won't be able to MFC this work as it relies on changes in HEAD, which
  was introduced some time ago, that break kernel ABI.  OTOH we may be able
  to merge the library with KVM backend if we really need it there.

Discussed with:	rwatson
2011-05-12 10:11:39 +00:00

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.Dd July 9, 2009
.Os
.Dt KINFO_GETPROC 3
.Sh NAME
.Nm kinfo_getproc
.Nd function for getting process information from kernel
.Sh LIBRARY
.Lb libutil
.Sh SYNOPSIS
.In sys/types.h
.In libutil.h
.Ft struct kinfo_proc *
.Fn kinfo_getproc "pid_t pid" "int *cntp"
.Sh DESCRIPTION
This function is used for obtaining process information from the kernel.
.Pp
The
.Ar pid
field contains the process identifier.
This should be the a process that you have privilige to access.
This function is a wrapper around
.Xr sysctl 3
with the
.Dv KERN_PROC_PID
mib.
While the kernel returns a packed structure, this function expands the
data into a fixed record format.
.Sh RETURN VALUES
On success the
.Fn kinfo_getproc
function returns a pointer to a
.Vt struct kinfo_proc
structure as defined by
.In sys/user.h .
The pointer was obtained by an internal call to
.Xr malloc 3
and must be freed by the caller with a call to
.Xr free 3 .
On failure the
.Fn kinfo_getproc
function returns
.Dv NULL .
.Sh SEE ALSO
.Xr free 3 ,
.Xr malloc 3 ,
.Xr sysctl 3