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// 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 "procps.h"
#include "pwcache.h"
// ld cutime, cstime, priority, nice, timeout, alarm, rss,
// c state,
// d ppid, pgrp, session, tty, tpgid,
// s signal, blocked, sigignore, sigcatch,
// lu flags, min_flt, cmin_flt, maj_flt, cmaj_flt, utime, stime,
// lu rss_rlim, start_code, end_code, start_stack, kstk_esp, kstk_eip,
// lu start_time, vsize, wchan,
// 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 {
// 1st 16 bytes
tid, // (special) task id, the POSIX thread ID (see also: tgid)
ppid; // stat,status pid of parent process
pcpu; // stat (special) %CPU usage (is not filled in by readproc!!!)
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
// 2nd 16 bytes
unsigned long long
utime, // stat user-mode CPU time accumulated by process
stime, // stat kernel-mode CPU time accumulated by process
// and so on...
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 1-1-70
// Linux 2.1.7x and up have 64 signals. Allow 64, plus '\0' and padding.
signal[18], // status mask of pending signals, per-task for readtask() but per-proc for readproc()
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
long long
// Linux 2.1.7x and up have 64 signals.
signal, // status mask of pending signals, per-task for readtask() but per-proc for readproc()
blocked, // status mask of blocked signals
sigignore, // status mask of ignored signals
sigcatch, // status mask of caught signals
_sigpnd; // status mask of PER TASK pending signals
unsigned KLONG
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
priority, // stat kernel scheduling priority
nice, // stat standard unix nice level of process
rss, // stat resident set size from /proc/#/stat (pages)
alarm, // stat ?
// the next 7 members come from /proc/#/statm
size, // statm total # of pages of memory
resident, // statm number of resident set (non-swapped) pages (4k)
share, // statm number of pages of shared (mmap'd) memory
trs, // statm text resident set size
lrs, // statm shared-lib resident set size
drs, // statm data resident set size
dt; // statm dirty pages
unsigned long
vm_size, // status same as vsize in kb
vm_lock, // status locked pages in kb
vm_rss, // status same as rss in kb
vm_data, // status data size
vm_stack, // status stack size
vm_exe, // status executable size
vm_lib, // status library size (all pages, not just used ones)
rtprio, // stat real-time priority
sched, // stat scheduling class
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
**environ, // (special) environment string vector (/proc/#/environ)
**cmdline; // (special) command line string vector (/proc/#/cmdline)
// Be compatible: Digital allows 16 and NT allows 14 ???
euser[P_G_SZ], // stat(),status effective user name
ruser[P_G_SZ], // status real user name
suser[P_G_SZ], // status saved user name
fuser[P_G_SZ], // status filesystem user name
rgroup[P_G_SZ], // status real group name
egroup[P_G_SZ], // status effective group name
sgroup[P_G_SZ], // status saved group name
fgroup[P_G_SZ], // status filesystem group name
cmd[16]; // stat,status basename of executable file in call to exec(2)
struct proc_t
*ring, // n/a thread group ring
*next; // n/a various library uses
pgrp, // stat process group id
session, // stat session id
nlwp, // stat,status number of threads, or 0 if no clue
tgid, // (special) task group ID, the POSIX PID (see also: tid)
tty, // stat full device number of controlling terminal
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
} 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).
#include <sys/types.h>
#include <dirent.h>
#include <unistd.h>
#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 did_fake; // used when taskdir is missing
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, const proc_t *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')
// initialize a PROCTAB structure holding needed call-to-call persistent data
extern PROCTAB* openproc(int flags, ... /* pid_t*|uid_t*|dev_t*|char* [, int n] */ );
typedef struct proc_data_t {
proc_t **tab;
proc_t **proc;
proc_t **task;
int n;
int nproc;
int ntask;
} proc_data_t;
extern proc_data_t *readproctab2(int(*want_proc)(proc_t *buf), int(*want_task)(proc_t *buf), PROCTAB *restrict const PT);
// Convenient wrapper around openproc and readproc to slurp in the whole process
// table subset satisfying the constraints of flags and the optional PID list.
// Free allocated memory with exit(). Access via tab[N]->member. The pointer
// list is NULL terminated.
extern proc_t** readproctab(int flags, ... /* same as openproc */ );
// clean-up open files, etc from the openproc()
extern void closeproc(PROCTAB* PT);
// retrieve the next process matching the criteria set by the openproc()
extern proc_t* readproc(PROCTAB *restrict const PT, proc_t *restrict p);
extern proc_t* readtask(PROCTAB *restrict const PT, const proc_t *restrict const p, proc_t *restrict t);
// warning: interface may change
extern int read_cmdline(char *restrict const dst, unsigned sz, unsigned pid);
extern void look_up_our_self(proc_t *p);
// deallocate space allocated by readproc
extern void freeproc(proc_t* p);
//fill out a proc_t for a single task
extern proc_t * get_proc_stats(pid_t pid, proc_t *p);
// 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_FILLCOM 0x0002 // alloc and fill in `cmdline'
#define PROC_FILLENV 0x0004 // alloc and fill in `environ'
#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 -- currently unconditional
#define PROC_FILLSTAT 0x0040 // read stat -- currently unconditional
#define PROC_FILLWCHAN 0x0080 // look up WCHAN name
#define PROC_FILLARG 0x0100 // alloc and fill in `cmdline'
#define PROC_LOOSE_TASKS 0x0200 // threat threads as if they were processes
// Obsolete, 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 )
// it helps to give app code a few spare bits
#define PROC_SPARE_1 0x01000000
#define PROC_SPARE_2 0x02000000
#define PROC_SPARE_3 0x04000000
#define PROC_SPARE_4 0x08000000