emo/procps
1
0
Fork 0
Code Issues Pull Requests Packages Releases Activity
7e4f21ddcc
procps/proc/readproc.h
Jim Warner 3c87c46439 library: tweak 'other' user/group names for efficiency 
This commit just ensures that the relatively expensive
ID to name conversions aren't performed unless they're
explicitly requested. It also internalizes those flags
that required the PROC_FILLSTATUS flag to also be set.

[ requiring a caller, in our case pids.c, to provide ]
[ two flags when a single field was the objective is ]
[ wrong & represents a future potential toe-stubber. ]

[ moreover, what's worse is that those two flags are ]
[ seemingly unrelated. but, without both, a SEGV can ]
[ can be expected when a result.str pointer is NULL. ]

[ by contrast, in the master branch those fields are ]
[ arrays which, when set to zeroes, produce an empty ]
[ string. So, there is no abend (but no name either) ]
[ when one of those two required flags were omitted. ]

[ and worth noting, in that branch it's not just one ]
[ caller required to observe a two flag requirement. ]

Signed-off-by: Jim Warner <james.warner@comcast.net>
2021-02-09 16:40:52 +11:00

257 lines
14 KiB
C
Raw Blame History

#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)
#ifdef FALSE_THREADS
pad_1, // n/a padding (psst, also used if multi-threaded)
#else
pad_1, // n/a padding
#endif
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
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
// 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 0x01000000
#define PROC_SPARE_2 0x02000000
#define PROC_SPARE_3 0x04000000
#define PROC_SPARE_4 0x08000000
// 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
Reference in New Issue View Git Blame Copy Permalink