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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
00038 typedef struct proc_t {
// 1st 16 bytes
00041         tid,            //!< (special)       task id, the POSIX thread ID (see also: tgid)
      ppid;       //!< stat,status     pid of parent process
00044         pcpu;           //!< stat (special)  %CPU usage (is not filled in by readproc!!!)
00046       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
00052       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.
00061       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
00076       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
00083       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
00096       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
00113       **environ,  //!< (special)       environment string vector (/proc/#/environ)
      **cmdline;  //!< (special)       command line string vector (/proc/#/cmdline)
      //!< Be compatible: Digital allows 16 and NT allows 14 ???
00117       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
      **supgrp, //!< status        supplementary groups
      cmd[32];    //!< stat,status     basename of executable file in call to exec(2)
00127     struct proc_t
      *ring,            //!< n/a             thread group ring
      *next;            //!< n/a             various library uses
00131       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
      nsupgid,    //!< status        number of supplementary groups
      *supgid,    //!< status        supplementary gid's
      exit_signal,      //!< stat            might not be SIGCHLD
      processor;      //!< stat            current (or most recent?) CPU
00145       char **cgroup;  //!< cgroup      current cgroup, looks like a classic filepath
} 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

00158 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] */ );

00183 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);

// allocate memory for supgrp
extern void allocsupgrp(proc_t *p);

// free memory allocated for supgrp
extern void freesupgrp(proc_t *p);

// 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);
extern void freeproc_light(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_FILLCGROUP      0x0200 // alloc and fill in `cgroup`
#define PROC_FILLSUPGRP      0x0400 // resolve supplementary group id number -> group name
#define PROC_TASKSUPGRP      0x0800 // resolve supplementary group id number -> group name

#define PROC_LOOSE_TASKS     0x2000 // 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

char** file2strvec(const char* directory, const char* what);
char** file2strvec_ext(const char* directory, const char* what, char terminator);


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