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procps/library/include/readproc.h

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/*
* readproc - interface to process table
*
* Copyright © 2002-2023 Craig Small <csmall@dropbear.xyz>
* Copyright © 2011-2023 Jim Warner <james.warner@comcast.net>
* Copyright © 1998-2010 Albert Cahalan
* Copyright © 1998 Michael K. Johnson
* Copyright © 1996 Charles L. Blake.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef PROCPS_PROC_READPROC_H
#define PROCPS_PROC_READPROC_H
#include <sys/types.h>
#include <dirent.h>
#include <unistd.h>
#include "misc.h"
// the following is development only, forcing display of "[ duplicate ENUM ]" strings
// #define FALSE_THREADS /* set most child string fields to NULL */
// This is to help document a transition from pid to tgid/tid caused
// by the introduction of thread support. It is used in cases where
// neither tgid nor tid seemed correct. (in other words, FIXME)
#define XXXID tid
// Basic data structure which holds all information we can get about a process.
// (unless otherwise specified, fields are read from /proc/#/stat)
//
// Most of it comes from task_struct in linux/sched.h
//
typedef struct proc_t {
int
tid, // (special) task id, the POSIX thread ID (see also: tgid)
ppid; // stat,status pid of parent process
char
state, // stat,status single-char code for process state (S=sleeping)
pad_1, // n/a padding
pad_2, // n/a padding
pad_3; // n/a padding
unsigned long long
utime, // stat user-mode CPU time accumulated by process
stime, // stat kernel-mode CPU time accumulated by process
cutime, // stat cumulative utime of process and reaped children
cstime, // stat cumulative stime of process and reaped children
start_time, // stat start time of process -- seconds since system boot
blkio_tics, // stat time spent waiting for block IO
gtime, // stat guest time of the task in jiffies
cgtime; // stat guest time of the task children in jiffies
int // next 3 fields are NOT filled in by readproc
pcpu, // stat (special) elapsed tics for %CPU usage calculation
maj_delta, // stat (special) major page faults since last update
min_delta; // stat (special) minor page faults since last update
char
// Linux 2.1.7x and up have 64 signals. Allow 64, plus '\0' and padding.
signal[18], // status mask of pending signals
blocked[18], // status mask of blocked signals
sigignore[18], // status mask of ignored signals
sigcatch[18], // status mask of caught signals
_sigpnd[18]; // status mask of PER TASK pending signals
unsigned long
start_code, // stat address of beginning of code segment
end_code, // stat address of end of code segment
start_stack, // stat address of the bottom of stack for the process
kstk_esp, // stat kernel stack pointer
kstk_eip, // stat kernel instruction pointer
wchan, // stat (special) address of kernel wait channel proc is sleeping in
rss, // stat identical to 'resident'
alarm; // stat ?
int
priority, // stat kernel scheduling priority
nice; // stat standard unix nice level of process
unsigned long
// the next 7 members come from /proc/#/statm
size, // statm total virtual memory (as # pages)
resident, // statm resident non-swapped memory (as # pages)
share, // statm shared (mmap'd) memory (as # pages)
trs, // statm text (exe) resident set (as # pages)
lrs, // statm library resident set (always 0 w/ 2.6)
drs, // statm data+stack resident set (as # pages)
dt; // statm dirty pages (always 0 w/ 2.6)
unsigned long
vm_size, // status equals 'size' (as kb)
vm_lock, // status locked pages (as kb)
vm_rss, // status equals 'rss' and/or 'resident' (as kb)
vm_rss_anon, // status the 'anonymous' portion of vm_rss (as kb)
vm_rss_file, // status the 'file-backed' portion of vm_rss (as kb)
vm_rss_shared, // status the 'shared' portion of vm_rss (as kb)
vm_data, // status data only size (as kb)
vm_stack, // status stack only size (as kb)
vm_swap, // status based on linux-2.6.34 "swap ents" (as kb)
vm_exe, // status equals 'trs' (as kb)
vm_lib, // status total, not just used, library pages (as kb)
vsize, // stat number of pages of virtual memory ...
rss_rlim, // stat resident set size limit?
flags, // stat kernel flags for the process
min_flt, // stat number of minor page faults since process start
maj_flt, // stat number of major page faults since process start
cmin_flt, // stat cumulative min_flt of process and child processes
cmaj_flt, // stat cumulative maj_flt of process and child processes
rchar, // io characters read
wchar, // io characters written
syscr, // io number of read I/O operations
syscw, // io number of write I/O operations
read_bytes, // io number of bytes fetched from the storage layer
write_bytes, // io number of bytes sent to the storage layer
cancelled_write_bytes, // io number of bytes truncating pagecache
smap_Rss, // smaps_rollup mapping currently resident in RAM
smap_Pss, // " Rss divided by total processes sharing it
smap_Pss_Anon, // " proportional share of 'anonymous' memory
smap_Pss_File, // " proportional share of 'file' memory
smap_Pss_Shmem, // " proportional share of 'shmem' memory
smap_Shared_Clean, // " unmodified shared memory
smap_Shared_Dirty, // " altered shared memory
smap_Private_Clean, // " unmodified private memory
smap_Private_Dirty, // " altered private memory
smap_Referenced, // " memory marked as referenced/accessed
smap_Anonymous, // " memory not belonging to any file
smap_LazyFree, // " memory marked by madvise(MADV_FREE)
smap_AnonHugePages, // " memory backed by transparent huge pages
smap_ShmemPmdMapped, // " shmem/tmpfs memory backed by huge pages
smap_FilePmdMapped, // " file memory backed by huge pages
smap_Shared_Hugetlb, // " hugetlbfs backed memory *not* counted in Rss/Pss
smap_Private_Hugetlb, // " hugetlbfs backed memory *not* counted in Rss/Pss
smap_Swap, // " swapped would-be-anonymous memory (includes swapped out shmem)
smap_SwapPss, // " the proportional share of 'Swap' (excludes swapped out shmem)
smap_Locked; // " memory amount locked to RAM
char
*environ, // (special) environment as string (/proc/#/environ)
*cmdline, // (special) command line as string (/proc/#/cmdline)
*cgroup, // (special) cgroup as string (/proc/#/cgroup)
*cgname, // (special) name portion of above (if possible)
*supgid, // status supplementary gids as comma delimited str
*supgrp, // supp grp names as comma delimited str, derived from supgid
**environ_v, // (special) environment string vectors (/proc/#/environ)
**cmdline_v, // (special) command line string vectors (/proc/#/cmdline)
**cgroup_v; // (special) cgroup string vectors (/proc/#/cgroup)
char
*euser, // stat(),status effective user name
*ruser, // status real user name
*suser, // status saved user name
*fuser, // status filesystem user name
*rgroup, // status real group name
*egroup, // status effective group name
*sgroup, // status saved group name
*fgroup, // status filesystem group name
*cmd; // stat,status basename of executable file in call to exec(2)
int
rtprio, // stat real-time priority
sched, // stat scheduling class
pgrp, // stat process group id
session, // stat session id
nlwp, // stat,status number of threads, or 0 if no clue
tgid, // (special) thread group ID, the POSIX PID (see also: tid)
tty; // stat full device number of controlling terminal
/* FIXME: int uids & gids should be uid_t or gid_t from pwd.h */
uid_t euid; gid_t egid; // stat(),status effective
uid_t ruid; gid_t rgid; // status real
uid_t suid; gid_t sgid; // status saved
uid_t fuid; gid_t fgid; // status fs (used for file access only)
int
tpgid, // stat terminal process group id
exit_signal, // stat might not be SIGCHLD
processor; // stat current (or most recent?) CPU
int
oom_score, // oom_score (badness for OOM killer)
oom_adj; // oom_adj (adjustment to OOM score)
struct procps_ns ns; // (ns subdir) inode number of namespaces
char
*sd_mach, // n/a systemd vm/container name
*sd_ouid, // n/a systemd session owner uid
*sd_seat, // n/a systemd login session seat
*sd_sess, // n/a systemd login session id
*sd_slice, // n/a systemd slice unit
*sd_unit, // n/a systemd system unit id
*sd_uunit; // n/a systemd user unit id
char
*lxcname, // n/a lxc container name
*exe; // exe executable path + name
int
luid, // loginuid user id at login
autogrp_id, // autogroup autogroup number (id)
autogrp_nice; // autogroup autogroup nice value
} proc_t;
// PROCTAB: data structure holding the persistent information readproc needs
// from openproc(). The setup is intentionally similar to the dirent interface
// and other system table interfaces (utmp+wtmp come to mind).
#define PROCPATHLEN 64 // must hold /proc/2000222000/task/2000222000/cmdline
typedef struct PROCTAB {
DIR *procfs;
// char deBug0[64];
DIR *taskdir; // for threads
// char deBug1[64];
pid_t taskdir_user; // for threads
int(*finder)(struct PROCTAB *__restrict const, proc_t *__restrict const);
proc_t*(*reader)(struct PROCTAB *__restrict const, proc_t *__restrict const);
int(*taskfinder)(struct PROCTAB *__restrict const, const proc_t *__restrict const, proc_t *__restrict const, char *__restrict const);
proc_t*(*taskreader)(struct PROCTAB *__restrict const, proc_t *__restrict const, char *__restrict const);
pid_t *pids; // pids of the procs
uid_t *uids; // uids of procs
int nuid; // cannot really sentinel-terminate unsigned short[]
int i; // generic
int hide_kernel; // getenv LIBPROC_HIDE_KERNEL was set
unsigned flags;
unsigned u; // generic
void * vp; // generic
char path[PROCPATHLEN]; // must hold /proc/2000222000/task/2000222000/cmdline
unsigned pathlen; // length of string in the above (w/o '\0')
} PROCTAB;
// openproc/readproctab:
//
// Return PROCTAB* / *proc_t[] or NULL on error ((probably) "/proc" cannot be
// opened.) By default readproc will consider all processes as valid to parse
// and return, but not actually fill in the cmdline, environ, and /proc/#/statm
// derived memory fields.
//
// `flags' (a bitwise-or of PROC_* below) modifies the default behavior. The
// "fill" options will cause more of the proc_t to be filled in. The "filter"
// options all use the second argument as the pointer to a list of objects:
// process status', process id's, user id's. The third
// argument is the length of the list (currently only used for lists of user
// id's since uid_t supports no convenient termination sentinel.)
#define PROC_FILLMEM 0x00000001 // read statm
#define PROC_FILLARG 0x00000002 // alloc and fill in `cmdline' vectors
#define PROC_FILLENV 0x00000004 // alloc and fill in `environ' vectors
#define PROC_FILLUSR 0x00000008 // resolve user id number -> user name
#define PROC_FILLGRP 0x00000010 // resolve group id number -> group name
#define PROC_FILLSTATUS 0x00000020 // read status
#define PROC_FILLSTAT 0x00000040 // read stat
#define PROC_FILLCGROUP 0x00000080 // alloc and fill in `cgroup` vectors
#define PROC_FILLOOM 0x00000100 // fill in proc_t oom_score and oom_adj
#define PROC_FILLNS 0x00000200 // fill in proc_t namespace information
#define PROC_FILLSYSTEMD 0x00000400 // fill in proc_t systemd information
#define PROC_FILL_LXC 0x00000800 // fill in proc_t lxcname, if possible
#define PROC_FILL_LUID 0x00001000 // fill in proc_t luid (login user id)
#define PROC_FILL_EXE 0x00002000 // fill in proc_t exe path + pgm name
#define PROC_FILLIO 0x00004000 // fill in proc_t io information
#define PROC_FILLSMAPS 0x00008000 // fill in proc_t smaps_rollup stuff
// consider only processes with one of the passed:
#define PROC_PID 0x00010000 // process id numbers ( 0 terminated )
#define PROC_UID 0x00020000 // user id numbers ( length needed )
// Note: the above 2 values must NOT change without also changing pids.h !!!
#define PROC_EDITCGRPCVT 0x00040000 // edit `cgroup' as regular string
#define PROC_EDITCMDLCVT 0x00080000 // edit `cmdline' as regular string
#define PROC_EDITENVRCVT 0x00100000 // edit `environ' as regular string
// these three also require the PROC_FILLSTATUS flage
#define PROC_FILL_OUSERS ( 0x00200000 | PROC_FILLSTATUS ) // obtain other user names
#define PROC_FILL_OGROUPS ( 0x00400000 | PROC_FILLSTATUS ) // obtain other group names
#define PROC_FILL_SUPGRP ( 0x00800000 | PROC_FILLSTATUS ) // obtain supplementary group names
// and let's put new flags here ...
#define PROC_FILLAUTOGRP 0x01000000 // fill in proc_t autogroup stuff
// it helps to give app code a few spare bits
#define PROC_SPARE_1 0x10000000
#define PROC_SPARE_2 0x20000000
#define PROC_SPARE_3 0x40000000
#define PROC_SPARE_4 0x80000000
// Function definitions
// Initialize a PROCTAB structure holding needed call-to-call persistent data
PROCTAB *openproc(unsigned flags, ... /* pid_t *| uid_t *| dev_t *| char *[, int n] */ );
// Retrieve the next process or task matching the criteria set by the openproc().
//
// Note: When NULL is used as the readproc 'p' or readeither 'x'
// parameter, the library will allocate the necessary proc_t storage.
//
// Alternatively, you may provide your own reuseable buffer address
// in which case that buffer *MUST* be initialized to zero one time
// only before first use. Thereafter, the library will manage such
// a passed proc_t, freeing any additional acquired memory associated
// with the previous process or thread.
proc_t *readproc(PROCTAB *__restrict const PT, proc_t *__restrict p);
proc_t *readeither(PROCTAB *__restrict const PT, proc_t *__restrict x);
int look_up_our_self(void);
void closeproc(PROCTAB *PT);
char **vectorize_this_str(const char *src);
#endif
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