LIBPROCSTAT(3) FreeBSD Library Functions Manual LIBPROCSTAT(3)
NAME
procstat_close, procstat_freeargv, procstat_freeauxv, procstat_freeenvv,
procstat_freefiles, procstat_freegroups, procstat_freekstack,
procstat_freeprocs, procstat_freeptlwpinfo, procstat_freevmmap,
procstat_get_pipe_info, procstat_get_pts_info, procstat_get_sem_info,
procstat_get_shm_info, procstat_get_socket_info, procstat_get_vnode_info,
procstat_getargv, procstat_getauxv, procstat_getenvv, procstat_getfiles,
procstat_getgroups, procstat_getkstack, procstat_getosrel,
procstat_getpathname, procstat_getprocs, procstat_getptlwpinfo,
procstat_getrlimit, procstat_getumask, procstat_getvmmap,
procstat_open_core, procstat_open_kvm, procstat_open_sysctl - library
interface for file and process information retrieval
LIBRARY
Process and Files Information Retrieval (libprocstat, -lprocstat)
SYNOPSIS
#include <sys/param.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <libprocstat.h>
void
procstat_close(struct procstat *procstat);
void
procstat_freeargv(struct procstat *procstat);
void
procstat_freeauxv(struct procstat *procstat, Elf_Auxinfo *auxv);
void
procstat_freeenvv(struct procstat *procstat);
void
procstat_freefiles(struct procstat *procstat,
struct filestat_list *head);
void
procstat_freegroups(struct procstat *procstat, gid_t *groups);
void
procstat_freekstack(struct procstat *procstat,
struct kinfo_kstack *kkstp);
void
procstat_freeprocs(struct procstat *procstat, struct kinfo_proc *p);
void
procstat_freevmmap(struct procstat *procstat,
struct kinfo_vmentry *vmmap);
void
procstat_freeptlwpinfo(struct procstat *procstat,
struct ptrace_lwpinfo *pl);
int
procstat_get_pipe_info(struct procstat *procstat, struct filestat *fst,
struct pipestat *pipe, char *errbuf);
int
procstat_get_pts_info(struct procstat *procstat, struct filestat *fst,
struct ptsstat *pts, char *errbuf);
int
procstat_get_sem_info(struct procstat *procstat, struct filestat *fst,
struct semstat *sem, char *errbuf);
int
procstat_get_shm_info(struct procstat *procstat, struct filestat *fst,
struct shmstat *shm, char *errbuf);
int
procstat_get_socket_info(struct procstat *procstat, struct filestat *fst,
struct sockstat *sock, char *errbuf);
int
procstat_get_vnode_info(struct procstat *procstat, struct filestat *fst,
struct vnstat *vn, char *errbuf);
char **
procstat_getargv(struct procstat *procstat, const struct kinfo_proc *kp,
size_t nchr);
Elf_Auxinfo *
procstat_getauxv(struct procstat *procstat, struct kinfo_proc *kp,
unsigned int *count);
char **
procstat_getenvv(struct procstat *procstat, const struct kinfo_proc *kp,
size_t nchr);
struct filestat_list *
procstat_getfiles(struct procstat *procstat, struct kinfo_proc *kp,
int mmapped);
gid_t *
procstat_getgroups(struct procstat *procstat, struct kinfo_proc *kp,
unsigned int *count);
struct kinfo_kstack *
procstat_getkstack(struct procstat *procstat, struct kinfo_proc *kp,
unsigned int *count);
int
procstat_getosrel(struct procstat *procstat, struct kinfo_proc *kp,
int *osrelp);
int
procstat_getpathname(struct procstat *procstat, struct kinfo_proc *kp,
char *pathname, size_t maxlen);
struct kinfo_proc *
procstat_getprocs(struct procstat *procstat, int what, int arg,
unsigned int *count);
struct ptrace_lwpinfo *
procstat_getptlwpinfo(struct procstat *procstat, unsigned int *count);
int
procstat_getrlimit(struct procstat *procstat, struct kinfo_proc *kp,
int which, struct rlimit* rlimit);
int
procstat_getumask(struct procstat *procstat, struct kinfo_proc *kp,
unsigned short *maskp);
struct kinfo_vmentry *
procstat_getvmmap(struct procstat *procstat, struct kinfo_proc *kp,
unsigned int *count);
struct procstat *
procstat_open_core(const char *filename);
struct procstat *
procstat_open_kvm(const char *nlistf, const char *memf);
struct procstat *
procstat_open_sysctl(void);
DESCRIPTION
The libprocstat library contains the API for runtime file and process
information retrieval from the running kernel via the sysctl(3) library
backend, and for post-mortem analysis via the kvm(3) library backend, or
from the process core(5) file, searching for statistics in special elf(3)
note sections.
The procstat_open_kvm() and procstat_open_sysctl() functions use the
kvm(3) or sysctl(3) library routines, respectively, to access kernel
state information used to retrieve processes and files states. The
procstat_open_core() uses elf(3) routines to access statistics stored as
a set of notes in a process core(5) file, written by the kernel at the
moment of the process abnormal termination. The filename argument is the
process core file name. The nlistf argument is the executable image of
the kernel being examined. If this argument is NULL, the currently
running kernel is assumed. The memf argument is the kernel memory device
file. If this argument is NULL, then /dev/mem is assumed. See
kvm_open(3) for more details. The functions dynamically allocate and
return a procstat structure pointer used in the rest of the libprocstat
library routines until the corresponding procstat_close() call that
cleans up the resources allocated by the procstat_open_*() functions.
The procstat_getprocs() function gets a pointer to the procstat structure
from one of the procstat_open_*() functions and returns a dynamically
allocated (sub-)set of active processes in the kernel filled in to array
of kinfo_proc structures. The what and arg arguments constitute a
filtering predicate as described in the kvm_getprocs(3) function. The
number of processes found is returned in the reference parameter cnt.
The caller is responsible to free the allocated memory with a subsequent
procstat_freeprocs() function call.
The procstat_getptlwpinfo() function gets a pointer to the procstat
structure from the procstat_open_core() function and returns a
dynamically allocated set of signals intercepted by a process in the
process's core file. The number of processes found is returned in the
reference parameter cnt. The caller is responsible to free the allocated
memory with a subsequent procstat_freeptlwpinfo() function call.
The procstat_getargv() function gets a pointer to the procstat structure
from one of the procstat_open_*() functions, a pointer to kinfo_proc
structure from the array obtained from the procstat_getprocs() function,
and returns a null-terminated argument vector that corresponds to the
command line arguments passed to the process. 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 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. The
values of the returned argument vector refer the strings stored in the
procstat internal buffer. A subsequent call of the function with the
same procstat argument will reuse the buffer. To free the allocated
memory procstat_freeargv() function call can be used, or it will be
released on procstat_close().
The procstat_getenvv() function is similar to procstat_getargv() but
returns the vector of environment strings. The caller may free the
allocated memory with a subsequent procstat_freeenvv() function call.
The procstat_getauxv() function gets a pointer to the procstat structure,
a pointer to kinfo_proc structure, and returns the auxiliary vector as a
dynamically allocated array of Elf_Auxinfo elements. The caller is
responsible to free the allocated memory with a subsequent
procstat_freeauxv() function call.
The procstat_getfiles() function gets a pointer to the procstat structure
initialized with one of the procstat_open_*() functions, a pointer to
kinfo_proc structure from the array obtained from the procstat_getprocs()
function, and returns a dynamically allocated linked list of filled in
filestat_list structures using the STAILQ macros defined in queue(3).
The caller is responsible to free the allocated memory with a subsequent
procstat_freefiles() function call.
The procstat_getgroups() function gets a pointer to the procstat
structure, a pointer to kinfo_proc structure, and returns the process
groups as a dynamically allocated array of gid_t elements. The caller is
responsible to free the allocated memory with a subsequent
procstat_freegroups() function call.
The procstat_getkstack() function gets a pointer to the procstat
structure initialized with one of the procstat_open_*() functions, a
pointer to kinfo_proc structure, and returns kernel stacks of the process
as a dynamically allocated array of kinfo_kstack structures. The caller
is responsible to free the allocated memory with a subsequent
procstat_freekstack() function call.
The procstat_getosrel() function gets a pointer to the procstat
structure, a pointer to kinfo_proc structure, and returns osrel date in
the 3rd reference parameter.
The procstat_getpathname() function gets a pointer to the procstat
structure, a pointer to kinfo_proc structure, and copies the path of the
process executable to pathname buffer, limiting to maxlen characters.
The procstat_getrlimit() function gets a pointer to the procstat
structure, a pointer to kinfo_proc structure, resource index which, and
returns the actual resource limit in the 4th reference parameter.
The procstat_getumask() function gets a pointer to the procstat
structure, a pointer to kinfo_proc structure, and returns the process
umask in the 3rd reference parameter.
The procstat_getvmmap() function gets a pointer to the procstat structure
initialized with one of the procstat_open_*() functions, a pointer to
kinfo_proc structure, and returns VM layout of the process as a
dynamically allocated array of kinfo_vmentry structures. The caller is
responsible to free the allocated memory with a subsequent
procstat_freevmmap() function call.
The procstat_get_pipe_info(), procstat_get_pts_info(),
procstat_get_sem_info(), procstat_get_shm_info(),
procstat_get_socket_info() and procstat_get_vnode_info() functions are
used to retrieve information about pipes, pseudo-terminals, semaphores,
shared memory objects, sockets, and vnodes, respectively. Each of them
have a similar interface API. The procstat argument is a pointer
obtained from one of procstat_open_*() functions. The filestat fst
argument is an element of STAILQ linked list as obtained from the
procstat_getfiles() function. The filestat structure contains a fs_type
field that specifies a file type and a corresponding function to be
called among the procstat_get_*_info function family. The actual object
is returned in the 3rd reference parameter. The errbuf argument
indicates an actual error message in case of failure.
PS_FST_TYPE_FIFO procstat_get_vnode_info
PS_FST_TYPE_VNODE procstat_get_vnode_info
PS_FST_TYPE_SOCKET procstat_get_socket_info
PS_FST_TYPE_PIPE procstat_get_pipe_info
PS_FST_TYPE_PTS procstat_get_pts_info
PS_FST_TYPE_SEM procstat_get_sem_info
PS_FST_TYPE_SHM procstat_get_shm_info
SEE ALSO
fstat(1), fuser(1), pipe(2), shm_open(2), socket(2), elf(3), kvm(3),
queue(3), sem_open(3), sysctl(3), pts(4), core(5), vnode(9)
HISTORY
The libprocstat library appeared in FreeBSD 9.0.
AUTHORS
The libprocstat library was written by Stanislav Sedov
<stas@FreeBSD.org>.
This manual page was written by Sergey Kandaurov <pluknet@FreeBSD.org>.
FreeBSD 13.1-RELEASE-p6 November 26, 2020 FreeBSD 13.1-RELEASE-p6
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