316 lines
15 KiB
C
316 lines
15 KiB
C
#ifndef PROCPS_PROC_READPROC_H
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#define PROCPS_PROC_READPROC_H
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// New Interface to Process Table -- PROCTAB Stream (a la Directory streams)
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// Copyright 1996 Charles L. Blake.
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// Copyright 1998 Michael K. Johnson
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// Copyright 1998-2003 Albert Cahalan
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// May be distributed under the terms of the
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// GNU Library General Public License, a copy of which is provided
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// in the file COPYING
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#include "procps.h"
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#include "pwcache.h"
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#define SIGNAL_STRING
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//#define QUICK_THREADS /* copy (vs. read) some thread info from parent proc_t */
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EXTERN_C_BEGIN
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// ld cutime, cstime, priority, nice, timeout, alarm, rss,
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// c state,
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// d ppid, pgrp, session, tty, tpgid,
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// s signal, blocked, sigignore, sigcatch,
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// lu flags, min_flt, cmin_flt, maj_flt, cmaj_flt, utime, stime,
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// lu rss_rlim, start_code, end_code, start_stack, kstk_esp, kstk_eip,
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// lu start_time, vsize, wchan,
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// This is to help document a transition from pid to tgid/tid caused
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// by the introduction of thread support. It is used in cases where
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// neither tgid nor tid seemed correct. (in other words, FIXME)
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#define XXXID tid
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enum ns_type {
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IPCNS = 0,
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MNTNS,
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NETNS,
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PIDNS,
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USERNS,
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UTSNS,
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NUM_NS // total namespaces (fencepost)
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};
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extern const char *get_ns_name(int id);
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extern int get_ns_id(const char *name);
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// Basic data structure which holds all information we can get about a process.
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// (unless otherwise specified, fields are read from /proc/#/stat)
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//
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// Most of it comes from task_struct in linux/sched.h
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//
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typedef struct proc_t {
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// 1st 16 bytes
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int
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tid, // (special) task id, the POSIX thread ID (see also: tgid)
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ppid; // stat,status pid of parent process
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unsigned long // next 2 fields are NOT filled in by readproc
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maj_delta, // stat (special) major page faults since last update
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min_delta; // stat (special) minor page faults since last update
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unsigned
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pcpu; // stat (special) %CPU usage (is not filled in by readproc!!!)
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char
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state, // stat,status single-char code for process state (S=sleeping)
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#ifdef QUICK_THREADS
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pad_1, // n/a padding (psst, also used if multi-threaded)
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#else
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pad_1, // n/a padding
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#endif
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pad_2, // n/a padding
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pad_3; // n/a padding
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// 2nd 16 bytes
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unsigned long long
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utime, // stat user-mode CPU time accumulated by process
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stime, // stat kernel-mode CPU time accumulated by process
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// and so on...
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cutime, // stat cumulative utime of process and reaped children
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cstime, // stat cumulative stime of process and reaped children
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start_time; // stat start time of process -- seconds since system boot
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#ifdef SIGNAL_STRING
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char
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// Linux 2.1.7x and up have 64 signals. Allow 64, plus '\0' and padding.
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signal[18], // status mask of pending signals, per-task for readtask() but per-proc for readproc()
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blocked[18], // status mask of blocked signals
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sigignore[18], // status mask of ignored signals
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sigcatch[18], // status mask of caught signals
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_sigpnd[18]; // status mask of PER TASK pending signals
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#else
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long long
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// Linux 2.1.7x and up have 64 signals.
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signal, // status mask of pending signals, per-task for readtask() but per-proc for readproc()
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blocked, // status mask of blocked signals
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sigignore, // status mask of ignored signals
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sigcatch, // status mask of caught signals
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_sigpnd; // status mask of PER TASK pending signals
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#endif
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unsigned KLONG
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start_code, // stat address of beginning of code segment
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end_code, // stat address of end of code segment
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start_stack, // stat address of the bottom of stack for the process
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kstk_esp, // stat kernel stack pointer
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kstk_eip, // stat kernel instruction pointer
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wchan; // stat (special) address of kernel wait channel proc is sleeping in
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long
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priority, // stat kernel scheduling priority
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nice, // stat standard unix nice level of process
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rss, // stat identical to 'resident'
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alarm, // stat ?
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// the next 7 members come from /proc/#/statm
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size, // statm total virtual memory (as # pages)
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resident, // statm resident non-swapped memory (as # pages)
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share, // statm shared (mmap'd) memory (as # pages)
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trs, // statm text (exe) resident set (as # pages)
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lrs, // statm library resident set (always 0 w/ 2.6)
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drs, // statm data+stack resident set (as # pages)
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dt; // statm dirty pages (always 0 w/ 2.6)
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unsigned long
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vm_size, // status equals 'size' (as kb)
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vm_lock, // status locked pages (as kb)
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vm_rss, // status equals 'rss' and/or 'resident' (as kb)
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vm_rss_anon, // status the 'anonymous' portion of vm_rss (as kb)
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vm_rss_file, // status the 'file-backed' portion of vm_rss (as kb)
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vm_rss_shared, // status the 'shared' portion of vm_rss (as kb)
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vm_data, // status data only size (as kb)
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vm_stack, // status stack only size (as kb)
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vm_swap, // status based on linux-2.6.34 "swap ents" (as kb)
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vm_exe, // status equals 'trs' (as kb)
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vm_lib, // status total, not just used, library pages (as kb)
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rtprio, // stat real-time priority
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sched, // stat scheduling class
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vsize, // stat number of pages of virtual memory ...
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rss_rlim, // stat resident set size limit?
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flags, // stat kernel flags for the process
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min_flt, // stat number of minor page faults since process start
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maj_flt, // stat number of major page faults since process start
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cmin_flt, // stat cumulative min_flt of process and child processes
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cmaj_flt; // stat cumulative maj_flt of process and child processes
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char
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**environ, // (special) environment string vector (/proc/#/environ)
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**cmdline, // (special) command line string vector (/proc/#/cmdline)
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**cgroup, // (special) cgroup string vector (/proc/#/cgroup)
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*cgname, // (special) name portion of above (if possible)
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*supgid, // status supplementary gids as comma delimited str
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*supgrp; // supp grp names as comma delimited str, derived from supgid
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char
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// Be compatible: Digital allows 16 and NT allows 14 ???
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euser[P_G_SZ], // stat(),status effective user name
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ruser[P_G_SZ], // status real user name
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suser[P_G_SZ], // status saved user name
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fuser[P_G_SZ], // status filesystem user name
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rgroup[P_G_SZ], // status real group name
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egroup[P_G_SZ], // status effective group name
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sgroup[P_G_SZ], // status saved group name
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fgroup[P_G_SZ], // status filesystem group name
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cmd[64]; // stat,status basename of executable file in call to exec(2)
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struct proc_t
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*ring, // n/a thread group ring
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*next; // n/a various library uses
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int
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pgrp, // stat process group id
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session, // stat session id
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nlwp, // stat,status number of threads, or 0 if no clue
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tgid, // (special) thread group ID, the POSIX PID (see also: tid)
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tty; // stat full device number of controlling terminal
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uid_t euid; gid_t egid; // stat(),status effective
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uid_t ruid; gid_t rgid; // status real
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uid_t suid; gid_t sgid; // status saved
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uid_t fuid; gid_t fgid; // status fs (used for file access only)
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int
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tpgid, // stat terminal process group id
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exit_signal, // stat might not be SIGCHLD
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processor; // stat current (or most recent?) CPU
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int
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oom_score, // oom_score (badness for OOM killer)
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oom_adj; // oom_adj (adjustment to OOM score)
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long
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ns[NUM_NS]; // (ns subdir) inode number of namespaces
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char
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*sd_mach, // n/a systemd vm/container name
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*sd_ouid, // n/a systemd session owner uid
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*sd_seat, // n/a systemd login session seat
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*sd_sess, // n/a systemd login session id
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*sd_slice, // n/a systemd slice unit
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*sd_unit, // n/a systemd system unit id
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*sd_uunit; // n/a systemd user unit id
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const char
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*lxcname; // n/a lxc container name
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} proc_t;
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// PROCTAB: data structure holding the persistent information readproc needs
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// from openproc(). The setup is intentionally similar to the dirent interface
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// and other system table interfaces (utmp+wtmp come to mind).
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#include <sys/types.h>
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#include <dirent.h>
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#include <unistd.h>
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#define PROCPATHLEN 64 // must hold /proc/2000222000/task/2000222000/cmdline
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typedef struct PROCTAB {
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DIR* procfs;
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// char deBug0[64];
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DIR* taskdir; // for threads
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// char deBug1[64];
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pid_t taskdir_user; // for threads
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int did_fake; // used when taskdir is missing
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int(*finder)(struct PROCTAB *__restrict const, proc_t *__restrict const);
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proc_t*(*reader)(struct PROCTAB *__restrict const, proc_t *__restrict const);
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int(*taskfinder)(struct PROCTAB *__restrict const, const proc_t *__restrict const, proc_t *__restrict const, char *__restrict const);
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proc_t*(*taskreader)(struct PROCTAB *__restrict const, const proc_t *__restrict const, proc_t *__restrict const, char *__restrict const);
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pid_t* pids; // pids of the procs
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uid_t* uids; // uids of procs
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int nuid; // cannot really sentinel-terminate unsigned short[]
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int i; // generic
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unsigned flags;
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unsigned u; // generic
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void * vp; // generic
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char path[PROCPATHLEN]; // must hold /proc/2000222000/task/2000222000/cmdline
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unsigned pathlen; // length of string in the above (w/o '\0')
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} PROCTAB;
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// Initialize a PROCTAB structure holding needed call-to-call persistent data
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extern PROCTAB* openproc(int flags, ... /* pid_t*|uid_t*|dev_t*|char* [, int n] */ );
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typedef struct proc_data_t { // valued by: (else zero)
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proc_t **tab; // readproctab2, readproctab3
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proc_t **proc; // readproctab2
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proc_t **task; // * readproctab2
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int n; // readproctab2, readproctab3
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int nproc; // readproctab2
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int ntask; // * readproctab2
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} proc_data_t; // * when PROC_LOOSE_TASKS set
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extern proc_data_t *readproctab2(int(*want_proc)(proc_t *buf), int(*want_task)(proc_t *buf), PROCTAB *__restrict const PT);
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extern proc_data_t *readproctab3(int(*want_task)(proc_t *buf), PROCTAB *__restrict const PT);
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// Convenient wrapper around openproc and readproc to slurp in the whole process
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// table subset satisfying the constraints of flags and the optional PID list.
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// Free allocated memory with exit(). Access via tab[N]->member. The pointer
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// list is NULL terminated.
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extern proc_t** readproctab(int flags, ... /* same as openproc */ );
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// Clean-up open files, etc from the openproc()
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extern void closeproc(PROCTAB* PT);
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// Retrieve the next process or task matching the criteria set by the openproc().
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//
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// Note: When NULL is used as the readproc 'p', readtask 't' or readeither 'x'
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// parameter, the library will allocate the necessary proc_t storage.
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//
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// Alternatively, you may provide your own reuseable buffer address
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// in which case that buffer *MUST* be initialized to zero one time
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// only before first use. Thereafter, the library will manage such
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// a passed proc_t, freeing any additional acquired memory associated
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// with the previous process or thread.
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extern proc_t* readproc(PROCTAB *__restrict const PT, proc_t *__restrict p);
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extern proc_t* readtask(PROCTAB *__restrict const PT, const proc_t *__restrict const p, proc_t *__restrict t);
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extern proc_t* readeither(PROCTAB *__restrict const PT, proc_t *__restrict x);
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// warning: interface may change
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extern int read_cmdline(char *__restrict const dst, unsigned sz, unsigned pid);
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extern void look_up_our_self(proc_t *p);
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// Deallocate space allocated by readproc
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extern void freeproc(proc_t* p);
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// Fill out a proc_t for a single task
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extern proc_t * get_proc_stats(pid_t pid, proc_t *p);
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// openproc/readproctab:
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//
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// Return PROCTAB* / *proc_t[] or NULL on error ((probably) "/proc" cannot be
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// opened.) By default readproc will consider all processes as valid to parse
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// and return, but not actually fill in the cmdline, environ, and /proc/#/statm
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// derived memory fields.
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//
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// `flags' (a bitwise-or of PROC_* below) modifies the default behavior. The
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// "fill" options will cause more of the proc_t to be filled in. The "filter"
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// options all use the second argument as the pointer to a list of objects:
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// process status', process id's, user id's. The third
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// argument is the length of the list (currently only used for lists of user
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// id's since uid_t supports no convenient termination sentinel.)
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#define PROC_FILLMEM 0x0001 // read statm
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#define PROC_FILLCOM 0x0002 // alloc and fill in `cmdline'
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#define PROC_FILLENV 0x0004 // alloc and fill in `environ'
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#define PROC_FILLUSR 0x0008 // resolve user id number -> user name
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#define PROC_FILLGRP 0x0010 // resolve group id number -> group name
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#define PROC_FILLSTATUS 0x0020 // read status
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#define PROC_FILLSTAT 0x0040 // read stat
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#define PROC_FILLARG 0x0100 // alloc and fill in `cmdline'
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#define PROC_FILLCGROUP 0x0200 // alloc and fill in `cgroup`
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#define PROC_FILLSUPGRP 0x0400 // resolve supplementary group id -> group name
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#define PROC_FILLOOM 0x0800 // fill in proc_t oom_score and oom_adj
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#define PROC_FILLNS 0x8000 // fill in proc_t namespace information
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#define PROC_FILLSYSTEMD 0x80000 // fill in proc_t systemd information
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#define PROC_FILL_LXC 0x800000 // fill in proc_t lxcname, if possible
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#define PROC_LOOSE_TASKS 0x2000 // treat threads as if they were processes
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// consider only processes with one of the passed:
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#define PROC_PID 0x1000 // process id numbers ( 0 terminated)
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#define PROC_UID 0x4000 // user id numbers ( length needed )
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#define PROC_EDITCGRPCVT 0x10000 // edit `cgroup' as single vector
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#define PROC_EDITCMDLCVT 0x20000 // edit `cmdline' as single vector
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#define PROC_EDITENVRCVT 0x40000 // edit `environ' as single vector
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// it helps to give app code a few spare bits
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#define PROC_SPARE_1 0x01000000
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#define PROC_SPARE_2 0x02000000
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#define PROC_SPARE_3 0x04000000
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#define PROC_SPARE_4 0x08000000
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EXTERN_C_END
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#endif
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