291 lines
7.3 KiB
Groff
291 lines
7.3 KiB
Groff
.\" Copyright (c) 2011 Sergey Kandaurov <pluknet@FreeBSD.org>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd April 1, 2012
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.Dt LIBPROCSTAT 3
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.Os
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.Sh NAME
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.Nm procstat_open_core ,
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.Nm procstat_open_kvm ,
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.Nm procstat_open_sysctl ,
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.Nm procstat_close ,
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.Nm procstat_getfiles ,
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.Nm procstat_getprocs ,
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.Nm procstat_freefiles ,
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.Nm procstat_freeprocs ,
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.Nm procstat_get_pipe_info ,
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.Nm procstat_get_pts_info ,
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.Nm procstat_get_shm_info ,
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.Nm procstat_get_socket_info ,
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.Nm procstat_get_vnode_info
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.Nd library interface for file and process information retrieval
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.Sh LIBRARY
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.Lb libprocstat
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.Sh SYNOPSIS
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.In sys/param.h
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.In sys/queue.h
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.In libprocstat.h
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.Ft void
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.Fn procstat_close "struct procstat *procstat"
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.Ft void
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.Fo procstat_freefiles
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.Fa "struct procstat *procstat"
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.Fa "struct filestat_list *head"
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.Fc
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.Ft void
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.Fn procstat_freeprocs "struct procstat *procstat" "struct kinfo_proc *p"
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.Ft int
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.Fo procstat_get_pipe_info
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.Fa "struct procstat *procstat"
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.Fa "struct filestat *fst"
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.Fa "struct pipestat *pipe"
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.Fa "char *errbuf"
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.Fc
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.Ft int
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.Fo procstat_get_pts_info
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.Fa "struct procstat *procstat"
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.Fa "struct filestat *fst"
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.Fa "struct ptsstat *pts"
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.Fa "char *errbuf"
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.Fc
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.Ft int
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.Fo procstat_get_shm_info
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.Fa "struct procstat *procstat"
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.Fa "struct filestat *fst"
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.Fa "struct shmstat *shm"
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.Fa "char *errbuf"
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.Fc
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.Ft int
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.Fo procstat_get_socket_info
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.Fa "struct procstat *procstat"
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.Fa "struct filestat *fst"
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.Fa "struct sockstat *sock"
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.Fa "char *errbuf"
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.Fc
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.Ft int
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.Fo procstat_get_vnode_info
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.Fa "struct procstat *procstat"
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.Fa "struct filestat *fst"
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.Fa "struct vnstat *vn"
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.Fa "char *errbuf"
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.Fc
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.Ft "struct filestat_list *"
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.Fo procstat_getfiles
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.Fa "struct procstat *procstat"
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.Fa "struct kinfo_proc *kp"
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.Fa "int mmapped"
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.Fc
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.Ft "struct kinfo_proc *"
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.Fo procstat_getprocs
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.Fa "struct procstat *procstat"
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.Fa "int what"
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.Fa "int arg"
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.Fa "unsigned int *count"
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.Fc
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.Ft "struct procstat *"
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.Fn procstat_open_core "const char *filename"
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.Ft "struct procstat *"
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.Fn procstat_open_kvm "const char *nlistf" "const char *memf"
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.Ft "struct procstat *"
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.Fn procstat_open_sysctl void
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.Sh DESCRIPTION
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The
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.Nm libprocstat
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library contains the API for runtime file and process information
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retrieval from the running kernel via the
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.Xr sysctl 3
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library backend, and for post-mortem analysis via the
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.Xr kvm 3
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library backend, or from the process
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.Xr core 5
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file, searching for statistics in special
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.Xr elf 3
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note sections.
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.Pp
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The
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.Fn procstat_open_kvm
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and
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.Fn procstat_open_sysctl
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functions use the
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.Xr kvm 3
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or
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.Xr sysctl 3
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library routines, respectively, to access kernel state information
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used to retrieve processes and files states.
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The
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.Fn procstat_open_core
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uses
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.Xr elf 3
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routines to access statistics stored as a set of notes in a process
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.Xr core 5
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file, written by the kernel at the moment of the process abnormal termination.
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The
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.Fa filename
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argument is the process core file name.
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The
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.Fa nlistf
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argument is the executable image of the kernel being examined.
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If this argument is
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.Dv NULL ,
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the currently running kernel is assumed.
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The
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.Fa memf
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argument is the kernel memory device file.
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If this argument is
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.Dv NULL ,
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then
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.Pa /dev/mem
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is assumed.
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See
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.Xr kvm_open 3
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for more details.
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The functions dynamically allocate and return a
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.Vt procstat
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structure pointer used in the rest of the
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.Nm libprocstat
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library routines until the corresponding
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.Fn procstat_close
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call that cleans up the resources allocated by the
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.Fn procstat_open_*
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functions.
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.Pp
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The
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.Fn procstat_getprocs
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function gets a pointer to the
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.Vt procstat
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structure from one of the
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.Fn procstat_open_*
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functions and returns a dynamically allocated (sub-)set of active processes
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in the kernel filled in to array of
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.Vt kinfo_proc
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structures.
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The
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.Fa what
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and
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.Fa arg
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arguments constitute a filtering predicate as described in the
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.Xr kvm_getprocs 3
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function.
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The number of processes found is returned in the reference parameter
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.Fa cnt .
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The caller is responsible to free the allocated memory with a subsequent
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.Fn procstat_freeprocs
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function call.
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.Pp
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The
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.Fn procstat_getfiles
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function gets a pointer to the
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.Vt procstat
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structure initialized with one of the
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.Fn procstat_open_*
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functions, a pointer to
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.Vt kinfo_proc
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structure from the array obtained from the
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.Fn kvm_getprocs
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function, and returns a dynamically allocated linked list of filled in
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.Vt filestat_list
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structures using the STAILQ macros defined in
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.Xr queue 3 .
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The caller is responsible to free the allocated memory with a subsequent
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.Fn procstat_freefiles
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function call.
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.Pp
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The
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.Fn procstat_get_pipe_info ,
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.Fn procstat_get_pts_info ,
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.Fn procstat_get_shm_info ,
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.Fn procstat_get_socket_info
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and
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.Fn procstat_get_vnode_info
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functions are used to retrieve information about pipes, pseudo-terminals,
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shared memory objects,
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sockets, and vnodes, respectively.
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Each of them have a similar interface API.
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The
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.Fa procstat
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argument is a pointer obtained from one of
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.Fn procstat_open_*
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functions.
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The
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.Ft filestat Fa fst
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argument is an element of STAILQ linked list as obtained from the
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.Fn procstat_getfiles
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function.
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The
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.Ft filestat
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structure contains a
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.Fa fs_type
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field that specifies a file type and a corresponding function to be
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called among the
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.Nm procstat_get_*_info
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function family.
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The actual object is returned in the 3rd reference parameter.
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The
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.Fa errbuf
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argument indicates an actual error message in case of failure.
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.Pp
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.Bl -tag -width 20n -compact -offset indent
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.It Li PS_FST_TYPE_FIFO
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.Nm procstat_get_vnode_info
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.It Li PS_FST_TYPE_VNODE
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.Nm procstat_get_vnode_info
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.It Li PS_FST_TYPE_SOCKET
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.Nm procstat_get_socket_info
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.It Li PS_FST_TYPE_PIPE
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.Nm procstat_get_pipe_info
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.It Li PS_FST_TYPE_PTS
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.Nm procstat_get_pts_info
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.It Li PS_FST_TYPE_SHM
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.Nm procstat_get_shm_info
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.El
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.Sh SEE ALSO
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.Xr fstat 1 ,
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.Xr fuser 1 ,
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.Xr pipe 2 ,
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.Xr shm_open 2 ,
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.Xr socket 2 ,
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.Xr elf 3 ,
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.Xr kvm 3 ,
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.Xr queue 3 ,
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.Xr sysctl 3 ,
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.Xr pts 4 ,
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.Xr core 5 ,
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.Xr vnode 9
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.Sh HISTORY
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The
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.Nm libprocstat
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library appeared in
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.Fx 9.0 .
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.Sh AUTHORS
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.An -nosplit
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The
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.Nm libprocstat
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library was written by
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.An Stanislav Sedov Aq stas@FreeBSD.org .
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.Pp
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This manual page was written by
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.An Sergey Kandaurov Aq pluknet@FreeBSD.org .
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