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procps/proc/readproc.h
Craig Small a7afe06e6f library: adding IO accounting 
This is a modification of MR !122 by @renit1609 to fit the new
library.

Problem statement:
The procps library has no PROC_FILLIO flag to
fetch the proc field "/proc/[pid]/io" data
process-wise.
IO Accounting is not included as part of procps.

Requirement:
We have a requirement to fetch process wise
IO utilization which can be used for monitoring.

When looking through the procps library, I see
that IO Accounting (/proc/[pid]/io) is not being
included as part of procps. There is no such
flag like PROC_FILLIO being included in readproc.h .

Solution:
While looking at the implementation done for
other proc fields, I used the spare bits in app code.
I renamed PROC_SPARE_1 as PROC_FILLIO, the spare bit from
PROC_SPARE_* and used it for fetching /proc/[pid]/io
data as part of the procps library similar to other
fields. I moved the PROC_SPARE_* bits each by 1 bit
to retain the spare bits. Meanwhile added the IO fields
in proc_t structure.

References:
 procps-ng/procps!122
 procps-ng/procps#184
2021-04-24 22:38:48 +10:00

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#ifndef PROCPS_PROC_READPROC_H
#define PROCPS_PROC_READPROC_H
// New Interface to Process Table -- PROCTAB Stream (a la Directory streams)
// Copyright 1996 Charles L. Blake.
// Copyright 1998 Michael K. Johnson
// Copyright 1998-2003 Albert Cahalan
// May be distributed under the terms of the
// GNU Library General Public License, a copy of which is provided
// in the file COPYING
#include <sys/types.h>
#include <dirent.h>
#include <unistd.h>
#include <proc/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
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 */
euid, egid, // stat(),status effective
ruid, rgid, // status real
suid, sgid, // status saved
fuid, fgid, // status fs (used for file access only)
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
} 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
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 0x0001 // read statm
#define PROC_FILLARG 0x0002 // alloc and fill in `cmdline' vectors
#define PROC_FILLENV 0x0004 // alloc and fill in `environ' vectors
#define PROC_FILLUSR 0x0008 // resolve user id number -> user name
#define PROC_FILLGRP 0x0010 // resolve group id number -> group name
#define PROC_FILLSTATUS 0x0020 // read status
#define PROC_FILLSTAT 0x0040 // read stat
#define PROC_FILLCGROUP 0x0200 // alloc and fill in `cgroup` vectors
#define PROC_FILLOOM 0x0800 // fill in proc_t oom_score and oom_adj
#define PROC_FILLNS 0x8000 // fill in proc_t namespace information
#define PROC_FILLSYSTEMD 0x80000 // fill in proc_t systemd information
#define PROC_FILL_LXC 0x800000 // fill in proc_t lxcname, if possible
#define PROC_FILL_LUID 0x400000 // fill in proc_t luid (login user id)
#define PROC_FILL_EXE 0x200000 // fill in proc_t exe path + pgm name
#define PROC_FILLIO 0x01000000 // fill in proc_t io information
// consider only processes with one of the passed:
#define PROC_PID 0x1000 // process id numbers ( 0 terminated)
#define PROC_UID 0x4000 // user id numbers ( length needed )
// Note: the above 2 values must NOT change without also changing pids.h !!!
#define PROC_EDITCGRPCVT 0x10000 // edit `cgroup' as regular string
#define PROC_EDITCMDLCVT 0x20000 // edit `cmdline' as regular string
#define PROC_EDITENVRCVT 0x40000 // edit `environ' as regular string
// these three also require the PROC_FILLSTATUS flage
#define PROC_FILL_OUSERS ( 0x0080 | PROC_FILLSTATUS ) // obtain other user names
#define PROC_FILL_OGROUPS ( 0x0100 | PROC_FILLSTATUS ) // obtain other group names
#define PROC_FILL_SUPGRP ( 0x0400 | PROC_FILLSTATUS ) // obtain supplementary group names
// it helps to give app code a few spare bits
#define PROC_SPARE_1 0x02000000
#define PROC_SPARE_2 0x04000000
#define PROC_SPARE_3 0x08000000
#define PROC_SPARE_4 0x10000000
// 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(proc_t *p);
void closeproc(PROCTAB* PT);
char** vectorize_this_str(const char* src);
#endif
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