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procps/proc/pids.c
Jim Warner 80ad63dc31 library: refactor exposed pointers management, 3rd gen 
This commit brings all of those 'fetch' type functions
(supporting some form of 'reap') into closer alignment
with one another. The biggest impact is to be found in
the <stat> module, which now provides for the separate
copy of stack pointers which will be exposed to users.

The reason such a copy was not employed initially with
<stat>, unlike those for <pids> and <slabinfo>, is due
to the fact that such stacks were never sortable. Thus
the original raw consolidated extent pointers wouldn't
have been disturbed. But that meant no NULL delimiter.

So with this commit, all reap/fetch operations now use
pointer copies when returning results to callers. And,
all such arrays are now NULL delimited meaning callers
can choose their own access fencepost: totals or NULL.

Signed-off-by: Jim Warner <james.warner@comcast.net>
2016-07-02 16:33:01 +10:00

1486 lines
53 KiB
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/*
* pids.c - task/thread/process related declarations for libproc
*
* Copyright (C) 1998-2005 Albert Cahalan
* Copyright (C) 2015 Craig Small <csmall@enc.com.au>
* Copyright (C) 2015 Jim Warner <james.warner@comcast.net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
//efine _GNU_SOURCE // for qsort_r
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <proc/devname.h>
#include <proc/readproc.h>
#include <proc/sysinfo.h>
#include <proc/uptime.h>
#include <proc/wchan.h>
#include <proc/procps-private.h>
#include <proc/pids.h>
//#define UNREF_RPTHASH // report on hashing, at uref time
#define FILL_ID_MAX 255 // upper limit for pid/uid fills
#define MEMORY_INCR 128 // amt by which allocations grow
struct stacks_extent {
struct pids_stack **stacks;
int ext_numstacks;
struct stacks_extent *next;
};
struct fetch_support {
struct pids_stack **anchor; // reap/select consolidated extents
int n_alloc; // number of above pointers allocated
int n_inuse; // number of above pointers occupied
int n_alloc_save; // last known results.stacks allocation
struct pids_fetch results; // counts + stacks for return to caller
struct pids_counts counts; // actual counts pointed to by 'results'
};
struct procps_pidsinfo {
int refcount;
int maxitems; // includes 'logical_end' delimiter
int curitems; // includes 'logical_end' delimiter
enum pids_item *items; // includes 'logical_end' delimiter
struct stacks_extent *extents; // anchor for all resettable extents
struct stacks_extent *otherexts; // anchor for single stack invariant extents
struct fetch_support fetch; // support for procps_pids_reap & select
int history_yes; // need historical data
struct history_info *hist; // pointer to historical support data
int dirty_stacks; // extents need dynamic storage clean
proc_t*(*read_something)(PROCTAB*, proc_t*); // readproc/readeither via which
unsigned pgs2k_shift; // to convert some proc vaules
unsigned oldflags; // the old library PROC_FILL flagss
PROCTAB *fetch_PT; // oldlib interface for 'select' & 'reap'
unsigned long hertz; // for TIME_ALL & TIME_ELAPSED calculations
unsigned long long boot_seconds; // for TIME_ELAPSED calculation
PROCTAB *get_PT; // oldlib interface for active 'get'
struct stacks_extent *get_ext; // an extent used for active 'get'
enum pids_fetch_type get_type; // last known type of 'get' request
};
// ___ Results 'Set' Support ||||||||||||||||||||||||||||||||||||||||||||||||||
static char** vectorize_this (const char* src) {
#define pSZ (sizeof(char*))
char *cpy, **vec;
int adj, tot;
tot = strlen(src) + 1; // prep for our vectors
adj = (pSZ-1) - ((tot + pSZ-1) & (pSZ-1)); // calc alignment bytes
cpy = calloc(1, tot + adj + (2 * pSZ)); // get new larger buffer
if (!cpy) return NULL; // we no longer use xcalloc
snprintf(cpy, tot, "%s", src); // duplicate their string
vec = (char**)(cpy + tot + adj); // prep pointer to pointers
*vec = cpy; // point 1st vector to string
*(vec+1) = NULL; // null ptr 'list' delimit
return vec; // ==> free(*vec) to dealloc
#undef pSZ
} // end: vectorize_this
#define setNAME(e) set_results_ ## e
#define setDECL(e) static void setNAME(e) \
(struct procps_pidsinfo *I, struct pids_result *R, proc_t *P)
/* convert pages to kib */
#define CVT_set(e,t,x) setDECL(e) { \
R->result. t = (long)(P-> x) << I -> pgs2k_shift; }
/* strdup of a static char array */
#define DUP_set(e,x) setDECL(e) { \
(void)I; R->result.str = strdup(P-> x); }
/* regular assignment copy */
#define REG_set(e,t,x) setDECL(e) { \
(void)I; R->result. t = P-> x; }
/* take ownership of a normal single string if possible, else return
some sort of hint that they duplicated this char * item ... */
#define STR_set(e,x) setDECL(e) { \
(void)I; if (NULL != P-> x) { R->result.str = P-> x; P-> x = NULL; } \
else R->result.str = strdup("[ duplicate " STRINGIFY(e) " ]"); }
/* take ownership of true vectorized strings if possible, else return
some sort of hint that they duplicated this char ** item ... */
#define VEC_set(e,x) setDECL(e) { \
(void)I; if (NULL != P-> x) { R->result.strv = P-> x; P-> x = NULL; } \
else R->result.strv = vectorize_this("[ duplicate " STRINGIFY(e) " ]"); }
setDECL(noop) { (void)I; (void)R; (void)P; return; }
setDECL(extra) { (void)I; (void)R; (void)P; return; }
REG_set(ADDR_END_CODE, ul_int, end_code)
REG_set(ADDR_KSTK_EIP, ul_int, kstk_eip)
REG_set(ADDR_KSTK_ESP, ul_int, kstk_esp)
REG_set(ADDR_START_CODE, ul_int, start_code)
REG_set(ADDR_START_STACK, ul_int, start_stack)
REG_set(ALARM, sl_int, alarm)
STR_set(CGNAME, cgname)
STR_set(CGROUP, cgroup)
VEC_set(CGROUP_V, cgroup_v)
STR_set(CMD, cmd)
STR_set(CMDLINE, cmdline)
VEC_set(CMDLINE_V, cmdline_v)
STR_set(ENVIRON, environ)
VEC_set(ENVIRON_V, environ_v)
REG_set(EXIT_SIGNAL, s_int, exit_signal)
REG_set(FLAGS, ul_int, flags)
REG_set(FLT_MAJ, sl_int, maj_flt)
REG_set(FLT_MAJ_C, sl_int, cmaj_flt)
REG_set(FLT_MAJ_DELTA, sl_int, maj_delta)
REG_set(FLT_MIN, sl_int, min_flt)
REG_set(FLT_MIN_C, sl_int, cmin_flt)
REG_set(FLT_MIN_DELTA, sl_int, min_delta)
REG_set(ID_EGID, u_int, egid)
REG_set(ID_EGROUP, str, egroup)
REG_set(ID_EUID, u_int, euid)
REG_set(ID_EUSER, str, euser)
REG_set(ID_FGID, u_int, fgid)
REG_set(ID_FGROUP, str, fgroup)
REG_set(ID_FUID, u_int, fuid)
REG_set(ID_FUSER, str, fuser)
REG_set(ID_PGRP, s_int, pgrp)
REG_set(ID_PID, s_int, tid)
REG_set(ID_PPID, s_int, ppid)
REG_set(ID_RGID, u_int, rgid)
REG_set(ID_RGROUP, str, rgroup)
REG_set(ID_RUID, u_int, ruid)
REG_set(ID_RUSER, str, ruser)
REG_set(ID_SESSION, s_int, session)
REG_set(ID_SGID, u_int, sgid)
REG_set(ID_SGROUP, str, sgroup)
REG_set(ID_SUID, u_int, suid)
REG_set(ID_SUSER, str, suser)
REG_set(ID_TGID, s_int, tgid)
REG_set(ID_TPGID, s_int, tpgid)
REG_set(LXCNAME, str, lxcname)
REG_set(MEM_CODE, sl_int, trs)
CVT_set(MEM_CODE_KIB, sl_int, trs)
REG_set(MEM_DATA, sl_int, drs)
CVT_set(MEM_DATA_KIB, sl_int, drs)
REG_set(MEM_DT, sl_int, dt)
REG_set(MEM_LRS, sl_int, lrs)
REG_set(MEM_RES, sl_int, resident)
CVT_set(MEM_RES_KIB, sl_int, resident)
REG_set(MEM_SHR, sl_int, share)
CVT_set(MEM_SHR_KIB, ul_int, share)
REG_set(MEM_VIRT, sl_int, size)
CVT_set(MEM_VIRT_KIB, sl_int, size)
REG_set(NICE, sl_int, nice)
REG_set(NLWP, s_int, nlwp)
REG_set(NS_IPC, ul_int, ns.ns[0])
REG_set(NS_MNT, ul_int, ns.ns[1])
REG_set(NS_NET, ul_int, ns.ns[2])
REG_set(NS_PID, ul_int, ns.ns[3])
REG_set(NS_USER, ul_int, ns.ns[4])
REG_set(NS_UTS, ul_int, ns.ns[5])
REG_set(OOM_ADJ, s_int, oom_adj)
REG_set(OOM_SCORE, s_int, oom_score)
REG_set(PRIORITY, s_int, priority)
REG_set(PROCESSOR, u_int, processor)
REG_set(RSS, sl_int, rss)
REG_set(RSS_RLIM, ul_int, rss_rlim)
REG_set(RTPRIO, ul_int, rtprio)
REG_set(SCHED_CLASS, ul_int, sched)
STR_set(SD_MACH, sd_mach)
STR_set(SD_OUID, sd_ouid)
STR_set(SD_SEAT, sd_seat)
STR_set(SD_SESS, sd_sess)
STR_set(SD_SLICE, sd_slice)
STR_set(SD_UNIT, sd_unit)
STR_set(SD_UUNIT, sd_uunit)
DUP_set(SIGBLOCKED, blocked)
DUP_set(SIGCATCH, sigcatch)
DUP_set(SIGIGNORE, sigignore)
DUP_set(SIGNALS, signal)
DUP_set(SIGPENDING, _sigpnd)
REG_set(STATE, s_ch, state)
STR_set(SUPGIDS, supgid)
STR_set(SUPGROUPS, supgrp)
setDECL(TICS_ALL) { (void)I; R->result.ull_int = P->utime + P->stime; }
setDECL(TICS_ALL_C) { (void)I; R->result.ull_int = P->utime + P->stime + P->cutime + P->cstime; }
REG_set(TICS_DELTA, sl_int, pcpu)
REG_set(TICS_SYSTEM, ull_int, stime)
REG_set(TICS_SYSTEM_C, ull_int, cstime)
REG_set(TICS_USER, ull_int, utime)
REG_set(TICS_USER_C, ull_int, cutime)
setDECL(TIME_ALL) { R->result.ull_int = (P->utime + P->stime) / I->hertz; }
setDECL(TIME_ELAPSED) { R->result.ull_int = (I->boot_seconds >= (P->start_time / I->hertz)) ? I->boot_seconds - (P->start_time / I->hertz) : 0; }
REG_set(TIME_START, ull_int, start_time)
REG_set(TTY, s_int, tty)
setDECL(TTY_NAME) { char buf[64]; (void)I; dev_to_tty(buf, sizeof(buf), P->tty, P->tid, ABBREV_DEV); R->result.str = strdup(buf); }
setDECL(TTY_NUMBER) { char buf[64]; (void)I; dev_to_tty(buf, sizeof(buf), P->tty, P->tid, ABBREV_DEV|ABBREV_TTY|ABBREV_PTS); R->result.str = strdup(buf); }
REG_set(VM_DATA, sl_int, vm_data)
REG_set(VM_EXE, sl_int, vm_exe)
REG_set(VM_LIB, sl_int, vm_lib)
REG_set(VM_RSS, sl_int, vm_rss)
REG_set(VM_RSS_ANON, sl_int, vm_rss_anon)
REG_set(VM_RSS_FILE, sl_int, vm_rss_file)
REG_set(VM_RSS_LOCKED, sl_int, vm_lock)
REG_set(VM_RSS_SHARED, sl_int, vm_rss_shared)
REG_set(VM_SIZE, sl_int, vm_size)
REG_set(VM_STACK, sl_int, vm_stack)
REG_set(VM_SWAP, sl_int, vm_swap)
setDECL(VM_USED) { (void)I; R->result.sl_int = P->vm_swap + P->vm_rss; }
REG_set(VSIZE_PGS, ul_int, vsize)
REG_set(WCHAN_ADDR, ul_int, wchan)
setDECL(WCHAN_NAME) { (void)I; R->result.str = strdup(lookup_wchan(P->tid)); }
#undef setDECL
#undef CVT_set
#undef DUP_set
#undef REG_set
#undef STR_set
#undef VEC_set
// ___ Free Storage Support |||||||||||||||||||||||||||||||||||||||||||||||||||
#define freNAME(e) free_results_ ## e
static void freNAME(str) (struct pids_result *R) {
if (R->result.str) free(R->result.str);
}
static void freNAME(strv) (struct pids_result *R) {
if (R->result.strv && *R->result.strv) free(*R->result.strv);
}
// ___ Sorting Support ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
struct sort_parms {
int offset;
enum pids_sort_order order;
};
#define srtNAME(t) sort_results_ ## t
#define srtDECL(t) static int srtNAME(t) \
(const struct pids_stack **A, const struct pids_stack **B, struct sort_parms *P)
#define NUM_srt(T) srtDECL(T) { \
const struct pids_result *a = (*A)->head + P->offset; \
const struct pids_result *b = (*B)->head + P->offset; \
return P->order * (a->result. T - b->result. T); }
#define REG_srt(T) srtDECL(T) { \
const struct pids_result *a = (*A)->head + P->offset; \
const struct pids_result *b = (*B)->head + P->offset; \
if ( a->result. T > b->result. T ) return P->order > 0 ? 1 : -1; \
if ( a->result. T < b->result. T ) return P->order > 0 ? -1 : 1; \
return 0; }
NUM_srt(s_ch)
NUM_srt(s_int)
NUM_srt(sl_int)
REG_srt(u_int)
REG_srt(ul_int)
REG_srt(ull_int)
srtDECL(str) {
const struct pids_result *a = (*A)->head + P->offset;
const struct pids_result *b = (*B)->head + P->offset;
return P->order * strcoll(a->result.str, b->result.str);
}
srtDECL(strv) {
const struct pids_result *a = (*A)->head + P->offset;
const struct pids_result *b = (*B)->head + P->offset;
if (!a->result.strv || !b->result.strv) return 0;
return P->order * strcoll((*a->result.strv), (*b->result.strv));
}
srtDECL(strvers) {
const struct pids_result *a = (*A)->head + P->offset;
const struct pids_result *b = (*B)->head + P->offset;
return P->order * strverscmp(a->result.str, b->result.str);
}
srtDECL(noop) {
(void)A; (void)B; (void)P;
return 0;
}
#undef srtDECL
#undef NUM_srt
#undef REG_srt
// ___ Controlling Table ||||||||||||||||||||||||||||||||||||||||||||||||||||||
// from either 'stat' or 'status' (preferred)
#define f_either PROC_SPARE_1
#define f_grp PROC_FILLGRP
#define f_lxc PROC_FILL_LXC
#define f_ns PROC_FILLNS
#define f_oom PROC_FILLOOM
#define f_stat PROC_FILLSTAT
#define f_statm PROC_FILLMEM
#define f_status PROC_FILLSTATUS
#define f_systemd PROC_FILLSYSTEMD
#define f_usr PROC_FILLUSR
// these next three will yield a single string (never vectorized)
#define x_cgroup PROC_EDITCGRPCVT
#define x_cmdline PROC_EDITCMDLCVT
#define x_environ PROC_EDITENVRCVT
// these next three will yield true verctorized strings
#define v_arg PROC_FILLARG
#define v_cgroup PROC_FILLCGROUP
#define v_env PROC_FILLENV
// remaining are compound flags
#define x_ogroup PROC_FILLSTATUS | PROC_FILLGRP
#define x_ouser PROC_FILLSTATUS | PROC_FILLUSR
#define x_supgrp PROC_FILLSTATUS | PROC_FILLSUPGRP
typedef void (*SET_t)(struct procps_pidsinfo *, struct pids_result *, proc_t *);
typedef void (*FRE_t)(struct pids_result *);
typedef int (*QSR_t)(const void *, const void *, void *);
#define RS(e) (SET_t)setNAME(e)
#define FF(e) (FRE_t)freNAME(e)
#define QS(t) (QSR_t)srtNAME(t)
/*
* Need it be said?
* This table must be kept in the exact same order as
* those 'enum pids_item' guys ! */
static struct {
SET_t setsfunc; // the actual result setting routine
unsigned oldflags; // PROC_FILLxxxx flags for this item
FRE_t freefunc; // free function for strings storage
QSR_t sortfunc; // sort cmp func for a specific type
int needhist; // a result requires history support
} Item_table[] = {
/* setsfunc oldflags freefunc sortfunc needhist
--------------------- ---------- --------- ------------- -------- */
{ RS(noop), 0, NULL, QS(noop), 0 }, // user only, never altered
{ RS(extra), 0, NULL, QS(ull_int), 0 }, // user only, reset to zero
{ RS(ADDR_END_CODE), f_stat, NULL, QS(ul_int), 0 },
{ RS(ADDR_KSTK_EIP), f_stat, NULL, QS(ul_int), 0 },
{ RS(ADDR_KSTK_ESP), f_stat, NULL, QS(ul_int), 0 },
{ RS(ADDR_START_CODE), f_stat, NULL, QS(ul_int), 0 },
{ RS(ADDR_START_STACK), f_stat, NULL, QS(ul_int), 0 },
{ RS(ALARM), f_stat, NULL, QS(sl_int), 0 },
{ RS(CGNAME), x_cgroup, FF(str), QS(str), 0 },
{ RS(CGROUP), x_cgroup, FF(str), QS(str), 0 },
{ RS(CGROUP_V), v_cgroup, FF(strv), QS(strv), 0 },
{ RS(CMD), f_either, FF(str), QS(str), 0 },
{ RS(CMDLINE), x_cmdline, FF(str), QS(str), 0 },
{ RS(CMDLINE_V), v_arg, FF(strv), QS(strv), 0 },
{ RS(ENVIRON), x_environ, FF(str), QS(str), 0 },
{ RS(ENVIRON_V), v_env, FF(strv), QS(strv), 0 },
{ RS(EXIT_SIGNAL), f_stat, NULL, QS(s_int), 0 },
{ RS(FLAGS), f_stat, NULL, QS(ul_int), 0 },
{ RS(FLT_MAJ), f_stat, NULL, QS(sl_int), 0 },
{ RS(FLT_MAJ_C), f_stat, NULL, QS(sl_int), 0 },
{ RS(FLT_MAJ_DELTA), f_stat, NULL, QS(sl_int), +1 },
{ RS(FLT_MIN), f_stat, NULL, QS(sl_int), 0 },
{ RS(FLT_MIN_C), f_stat, NULL, QS(sl_int), 0 },
{ RS(FLT_MIN_DELTA), f_stat, NULL, QS(sl_int), +1 },
{ RS(ID_EGID), 0, NULL, QS(u_int), 0 }, // oldflags: free w/ simple_read
{ RS(ID_EGROUP), f_grp, NULL, QS(str), 0 },
{ RS(ID_EUID), 0, NULL, QS(u_int), 0 }, // oldflags: free w/ simple_read
{ RS(ID_EUSER), f_usr, NULL, QS(str), 0 }, // freefunc NULL w/ cached string
{ RS(ID_FGID), f_status, NULL, QS(u_int), 0 },
{ RS(ID_FGROUP), x_ogroup, NULL, QS(str), 0 },
{ RS(ID_FUID), f_status, NULL, QS(u_int), 0 },
{ RS(ID_FUSER), x_ouser, NULL, QS(str), 0 }, // freefunc NULL w/ cached string
{ RS(ID_PGRP), f_stat, NULL, QS(s_int), 0 },
{ RS(ID_PID), 0, NULL, QS(s_int), 0 }, // oldflags: free w/ simple_nextpid
{ RS(ID_PPID), f_either, NULL, QS(s_int), 0 },
{ RS(ID_RGID), f_status, NULL, QS(u_int), 0 },
{ RS(ID_RGROUP), x_ogroup, NULL, QS(str), 0 },
{ RS(ID_RUID), f_status, NULL, QS(u_int), 0 },
{ RS(ID_RUSER), x_ouser, NULL, QS(str), 0 }, // freefunc NULL w/ cached string
{ RS(ID_SESSION), f_stat, NULL, QS(s_int), 0 },
{ RS(ID_SGID), f_status, NULL, QS(u_int), 0 },
{ RS(ID_SGROUP), x_ogroup, NULL, QS(str), 0 },
{ RS(ID_SUID), f_status, NULL, QS(u_int), 0 },
{ RS(ID_SUSER), x_ouser, NULL, QS(str), 0 }, // freefunc NULL w/ cached string
{ RS(ID_TGID), 0, NULL, QS(s_int), 0 }, // oldflags: free w/ simple_nextpid
{ RS(ID_TPGID), f_stat, NULL, QS(s_int), 0 },
{ RS(LXCNAME), f_lxc, NULL, QS(str), 0 }, // freefunc NULL w/ cached string
{ RS(MEM_CODE), f_statm, NULL, QS(sl_int), 0 },
{ RS(MEM_CODE_KIB), f_statm, NULL, QS(sl_int), 0 },
{ RS(MEM_DATA), f_statm, NULL, QS(sl_int), 0 },
{ RS(MEM_DATA_KIB), f_statm, NULL, QS(sl_int), 0 },
{ RS(MEM_DT), f_statm, NULL, QS(sl_int), 0 },
{ RS(MEM_LRS), f_statm, NULL, QS(sl_int), 0 },
{ RS(MEM_RES), f_statm, NULL, QS(sl_int), 0 },
{ RS(MEM_RES_KIB), f_statm, NULL, QS(sl_int), 0 },
{ RS(MEM_SHR), f_statm, NULL, QS(sl_int), 0 },
{ RS(MEM_SHR_KIB), f_statm, NULL, QS(sl_int), 0 },
{ RS(MEM_VIRT), f_statm, NULL, QS(sl_int), 0 },
{ RS(MEM_VIRT_KIB), f_statm, NULL, QS(sl_int), 0 },
{ RS(NICE), f_stat, NULL, QS(sl_int), 0 },
{ RS(NLWP), f_either, NULL, QS(s_int), 0 },
{ RS(NS_IPC), f_ns, NULL, QS(ul_int), 0 },
{ RS(NS_MNT), f_ns, NULL, QS(ul_int), 0 },
{ RS(NS_NET), f_ns, NULL, QS(ul_int), 0 },
{ RS(NS_PID), f_ns, NULL, QS(ul_int), 0 },
{ RS(NS_USER), f_ns, NULL, QS(ul_int), 0 },
{ RS(NS_UTS), f_ns, NULL, QS(ul_int), 0 },
{ RS(OOM_ADJ), f_oom, NULL, QS(s_int), 0 },
{ RS(OOM_SCORE), f_oom, NULL, QS(s_int), 0 },
{ RS(PRIORITY), f_stat, NULL, QS(s_int), 0 },
{ RS(PROCESSOR), f_stat, NULL, QS(u_int), 0 },
{ RS(RSS), f_stat, NULL, QS(sl_int), 0 },
{ RS(RSS_RLIM), f_stat, NULL, QS(ul_int), 0 },
{ RS(RTPRIO), f_stat, NULL, QS(ul_int), 0 },
{ RS(SCHED_CLASS), f_stat, NULL, QS(ul_int), 0 },
{ RS(SD_MACH), f_systemd, FF(str), QS(str), 0 },
{ RS(SD_OUID), f_systemd, FF(str), QS(str), 0 },
{ RS(SD_SEAT), f_systemd, FF(str), QS(str), 0 },
{ RS(SD_SESS), f_systemd, FF(str), QS(str), 0 },
{ RS(SD_SLICE), f_systemd, FF(str), QS(str), 0 },
{ RS(SD_UNIT), f_systemd, FF(str), QS(str), 0 },
{ RS(SD_UUNIT), f_systemd, FF(str), QS(str), 0 },
{ RS(SIGBLOCKED), f_status, FF(str), QS(str), 0 },
{ RS(SIGCATCH), f_status, FF(str), QS(str), 0 },
{ RS(SIGIGNORE), f_status, FF(str), QS(str), 0 },
{ RS(SIGNALS), f_status, FF(str), QS(str), 0 },
{ RS(SIGPENDING), f_status, FF(str), QS(str), 0 },
{ RS(STATE), f_either, NULL, QS(s_ch), 0 },
{ RS(SUPGIDS), f_status, FF(str), QS(str), 0 },
{ RS(SUPGROUPS), x_supgrp, FF(str), QS(str), 0 },
{ RS(TICS_ALL), f_stat, NULL, QS(ull_int), 0 },
{ RS(TICS_ALL_C), f_stat, NULL, QS(ull_int), 0 },
{ RS(TICS_DELTA), f_stat, NULL, QS(sl_int), +1 },
{ RS(TICS_SYSTEM), f_stat, NULL, QS(ull_int), 0 },
{ RS(TICS_SYSTEM_C), f_stat, NULL, QS(ull_int), 0 },
{ RS(TICS_USER), f_stat, NULL, QS(ull_int), 0 },
{ RS(TICS_USER_C), f_stat, NULL, QS(ull_int), 0 },
{ RS(TIME_ALL), f_stat, NULL, QS(ull_int), 0 },
{ RS(TIME_ELAPSED), f_stat, NULL, QS(ull_int), 0 },
{ RS(TIME_START), f_stat, NULL, QS(ull_int), 0 },
{ RS(TTY), f_stat, NULL, QS(s_int), 0 },
{ RS(TTY_NAME), f_stat, FF(str), QS(strvers), 0 },
{ RS(TTY_NUMBER), f_stat, FF(str), QS(strvers), 0 },
{ RS(VM_DATA), f_status, NULL, QS(sl_int), 0 },
{ RS(VM_EXE), f_status, NULL, QS(sl_int), 0 },
{ RS(VM_LIB), f_status, NULL, QS(sl_int), 0 },
{ RS(VM_RSS), f_status, NULL, QS(sl_int), 0 },
{ RS(VM_RSS_ANON), f_status, NULL, QS(sl_int), 0 },
{ RS(VM_RSS_FILE), f_status, NULL, QS(sl_int), 0 },
{ RS(VM_RSS_LOCKED), f_status, NULL, QS(sl_int), 0 },
{ RS(VM_RSS_SHARED), f_status, NULL, QS(sl_int), 0 },
{ RS(VM_SIZE), f_status, NULL, QS(sl_int), 0 },
{ RS(VM_STACK), f_status, NULL, QS(sl_int), 0 },
{ RS(VM_SWAP), f_status, NULL, QS(sl_int), 0 },
{ RS(VM_USED), f_status, NULL, QS(sl_int), 0 },
{ RS(VSIZE_PGS), f_stat, NULL, QS(ul_int), 0 },
{ RS(WCHAN_ADDR), f_stat, NULL, QS(ul_int), 0 },
{ RS(WCHAN_NAME), 0, FF(str), QS(str), 0 }, // oldflags: tid already free
// dummy entry corresponding to PROCPS_PIDS_logical_end ...
{ NULL, 0, NULL, NULL, 0 }
};
// next MUST be kept in sync with highest value enum
enum pids_item PROCPS_PIDS_logical_end = PROCPS_PIDS_WCHAN_NAME + 1;
#undef setNAME
#undef freNAME
#undef srtNAME
#undef RS
#undef FF
#undef QS
//#undef f_either // needed later
#undef f_grp
#undef f_lxc
#undef f_ns
#undef f_oom
//#undef f_stat // needed later
#undef f_statm
//#undef f_status // needed later
#undef f_systemd
#undef f_usr
#undef v_arg
#undef v_cgroup
#undef v_env
#undef x_cgroup
#undef x_cmdline
#undef x_environ
#undef x_ogroup
#undef x_ouser
#undef x_supgrp
// ___ History Support Private Functions ||||||||||||||||||||||||||||||||||||||
// ( stolen from top when he wasn't looking ) -------------------------------
#define HHASH_SIZE 1024
#define _HASH_PID_(K) (K & (HHASH_SIZE - 1))
#define Hr(x) info->hist->x // 'hist ref', minimize stolen impact
typedef unsigned long long TIC_t;
typedef struct HST_t {
TIC_t tics; // last frame's tics count
long maj, min; // last frame's maj/min_flt counts
int pid; // record 'key'
int lnk; // next on hash chain
} HST_t;
struct history_info {
int num_tasks; // used as index (tasks tallied)
int HHist_siz; // max number of HST_t structs
HST_t *PHist_sav; // alternating 'old/new' HST_t anchors
HST_t *PHist_new;
int HHash_one [HHASH_SIZE]; // the actual hash tables
int HHash_two [HHASH_SIZE]; // (accessed via PHash_sav/PHash_new)
int HHash_nul [HHASH_SIZE]; // an 'empty' hash table image
int *PHash_sav; // alternating 'old/new' hash tables
int *PHash_new; // (aka. the 'one/two' actual tables)
};
static void config_history (
struct procps_pidsinfo *info)
{
int i;
for (i = 0; i < HHASH_SIZE; i++) // make the 'empty' table image
Hr(HHash_nul[i]) = -1;
memcpy(Hr(HHash_one), Hr(HHash_nul), sizeof(Hr(HHash_nul)));
memcpy(Hr(HHash_two), Hr(HHash_nul), sizeof(Hr(HHash_nul)));
Hr(PHash_sav) = Hr(HHash_one); // alternating 'old/new' hash tables
Hr(PHash_new) = Hr(HHash_two);
} // end: config_history
static inline HST_t *histget (
struct procps_pidsinfo *info,
int pid)
{
int V = Hr(PHash_sav[_HASH_PID_(pid)]);
while (-1 < V) {
if (Hr(PHist_sav[V].pid) == pid)
return &Hr(PHist_sav[V]);
V = Hr(PHist_sav[V].lnk); }
return NULL;
} // end: histget
static inline void histput (
struct procps_pidsinfo *info,
unsigned this)
{
int V = _HASH_PID_(Hr(PHist_new[this].pid));
Hr(PHist_new[this].lnk) = Hr(PHash_new[V]);
Hr(PHash_new[V] = this);
} // end: histput
#undef _HASH_PID_
static int make_hist (
struct procps_pidsinfo *info,
proc_t *p)
{
#define nSLOT info->hist->num_tasks
TIC_t tics;
HST_t *h;
if (nSLOT + 1 >= Hr(HHist_siz)) {
Hr(HHist_siz) += MEMORY_INCR;
Hr(PHist_sav) = realloc(Hr(PHist_sav), sizeof(HST_t) * Hr(HHist_siz));
Hr(PHist_new) = realloc(Hr(PHist_new), sizeof(HST_t) * Hr(HHist_siz));
if (!Hr(PHist_sav) || !Hr(PHist_new))
return -ENOMEM;
}
Hr(PHist_new[nSLOT].pid) = p->tid;
Hr(PHist_new[nSLOT].tics) = tics = (p->utime + p->stime);
Hr(PHist_new[nSLOT].maj) = p->maj_flt;
Hr(PHist_new[nSLOT].min) = p->min_flt;
histput(info, nSLOT);
if ((h = histget(info, p->tid))) {
tics -= h->tics;
p->pcpu = tics;
p->maj_delta = p->maj_flt - h->maj;
p->min_delta = p->min_flt - h->min;
}
nSLOT++;
return 0;
#undef nSLOT
} // end: make_hist
static inline void toggle_history (
struct procps_pidsinfo *info)
{
void *v;
v = Hr(PHist_sav);
Hr(PHist_sav) = Hr(PHist_new);
Hr(PHist_new) = v;
v = Hr(PHash_sav);
Hr(PHash_sav) = Hr(PHash_new);
Hr(PHash_new) = v;
memcpy(Hr(PHash_new), Hr(HHash_nul), sizeof(Hr(HHash_nul)));
info->hist->num_tasks = 0;
} // end: toggle_history
#ifdef UNREF_RPTHASH
static void unref_rpthash (
struct procps_pidsinfo *info)
{
int i, j, pop, total_occupied, maxdepth, maxdepth_sav, numdepth
, cross_foot, sz = HHASH_SIZE * (int)sizeof(int)
, hsz = (int)sizeof(HST_t) * Hr(HHist_siz);
int depths[HHASH_SIZE];
for (i = 0, total_occupied = 0, maxdepth = 0; i < HHASH_SIZE; i++) {
int V = Hr(PHash_new[i]);
j = 0;
if (-1 < V) {
++total_occupied;
while (-1 < V) {
V = Hr(PHist_new[V].lnk);
if (-1 < V) j++;
}
}
depths[i] = j;
if (maxdepth < j) maxdepth = j;
}
maxdepth_sav = maxdepth;
fprintf(stderr,
"\n History Memory Costs:"
"\n\tHST_t size = %d, total allocated = %d,"
"\n\tthus PHist_new & PHist_sav consumed %dk (%d) total bytes."
"\n"
"\n\tTwo hash tables provide for %d entries each + 1 extra 'empty' image,"
"\n\tthus %dk (%d) bytes per table for %dk (%d) total bytes."
"\n"
"\n\tGrand total = %dk (%d) bytes."
"\n"
"\n Hash Results Report:"
"\n\tTotal hashed = %d"
"\n\tLevel-0 hash entries = %d (%d%% occupied)"
"\n\tMax Depth = %d"
"\n\n"
, (int)sizeof(HST_t), Hr(HHist_siz)
, hsz / 1024, hsz
, HHASH_SIZE
, sz / 1024, sz, (sz * 3) / 1024, sz * 3
, (hsz + (sz * 3)) / 1024, hsz + (sz * 3)
, info->hist->num_tasks
, total_occupied, (total_occupied * 100) / HHASH_SIZE
, maxdepth);
if (total_occupied) {
for (pop = total_occupied, cross_foot = 0; maxdepth; maxdepth--) {
for (i = 0, numdepth = 0; i < HHASH_SIZE; i++)
if (depths[i] == maxdepth) ++numdepth;
fprintf(stderr,
"\t %5d (%3d%%) hash table entries at depth %d\n"
, numdepth, (numdepth * 100) / total_occupied, maxdepth);
pop -= numdepth;
cross_foot += numdepth;
if (0 == pop && cross_foot == total_occupied) break;
}
if (pop) {
fprintf(stderr, "\t %5d (%3d%%) unchained entries (at depth 0)\n"
, pop, (pop * 100) / total_occupied);
cross_foot += pop;
}
fprintf(stderr,
"\t -----\n"
"\t %5d total entries occupied\n", cross_foot);
if (maxdepth_sav > 1) {
fprintf(stderr, "\n PIDs at max depth: ");
for (i = 0; i < HHASH_SIZE; i++)
if (depths[i] == maxdepth_sav) {
j = Hr(PHash_new[i]);
fprintf(stderr, "\n\tpos %4d: %05d", i, Hr(PHist_new[j].pid));
while (-1 < j) {
j = Hr(PHist_new[j].lnk);
if (-1 < j) fprintf(stderr, ", %05d", Hr(PHist_new[j].pid));
}
}
fprintf(stderr, "\n");
}
}
} // end: unref_rpthash
#endif // UNREF_RPTHASH
#undef Hr
#undef HHASH_SIZE
// ___ Standard Private Functions |||||||||||||||||||||||||||||||||||||||||||||
static inline void assign_results (
struct procps_pidsinfo *info,
struct pids_stack *stack,
proc_t *p)
{
struct pids_result *this = stack->head;
for (;;) {
enum pids_item item = this->item;
if (item >= PROCPS_PIDS_logical_end)
break;
Item_table[item].setsfunc(info, this, p);
info->dirty_stacks |= Item_table[item].freefunc ? 1 : 0;
++this;
}
return;
} // end: assign_results
static inline void cleanup_stack (
struct pids_result *this)
{
for (;;) {
enum pids_item item = this->item;
if (item >= PROCPS_PIDS_logical_end)
break;
if (Item_table[item].freefunc)
Item_table[item].freefunc(this);
if (item > PROCPS_PIDS_noop)
this->result.ull_int = 0;
++this;
}
} // end: cleanup_stack
static inline void cleanup_stacks_all (
struct procps_pidsinfo *info)
{
struct stacks_extent *ext = info->extents;
int i;
while (ext) {
for (i = 0; ext->stacks[i]; i++)
cleanup_stack(ext->stacks[i]->head);
ext = ext->next;
};
info->dirty_stacks = 0;
} // end: cleanup_stacks_all
/*
* This routine exists in case we ever want to offer something like
* 'static' or 'invarient' results stacks. By unsplicing an extent
* from the info anchor it will be isolated from future reset/free. */
static struct stacks_extent *extent_cut (
struct procps_pidsinfo *info,
struct stacks_extent *ext)
{
struct stacks_extent *p = info->extents;
if (ext) {
if (ext == p) {
info->extents = p->next;
return ext;
}
do {
if (ext == p->next) {
p->next = p->next->next;
return ext;
}
p = p->next;
} while (p);
}
return NULL;
} // end: extent_cut
static void extents_free_all (
struct procps_pidsinfo *info)
{
while (info->extents) {
struct stacks_extent *p = info->extents;
info->extents = info->extents->next;
free(p);
};
} // end: extents_free_all
static inline struct pids_result *itemize_stack (
struct pids_result *p,
int depth,
enum pids_item *items)
{
struct pids_result *p_sav = p;
int i;
for (i = 0; i < depth; i++) {
p->item = items[i];
p->result.ull_int = 0;
++p;
}
return p_sav;
} // end: itemize_stack
static void itemize_stacks_all (
struct procps_pidsinfo *info)
{
struct stacks_extent *ext = info->extents;
while (ext) {
int i;
for (i = 0; ext->stacks[i]; i++)
itemize_stack(ext->stacks[i]->head, info->curitems, info->items);
ext = ext->next;
};
info->dirty_stacks = 0;
}
static inline int items_check_failed (
enum pids_item *items,
int numitems)
{
int i;
/* if an enum is passed instead of an address of one or more enums, ol' gcc
* will silently convert it to an address (possibly NULL). only clang will
* offer any sort of warning like the following:
*
* warning: incompatible integer to pointer conversion passing 'int' to parameter of type 'enum pids_item *'
* if (procps_pids_new(&info, PROCPS_PIDS_noop, 3) < 0)
* ^~~~~~~~~~~~~~~~
*/
if (numitems < 1
|| (void *)items < (void *)0x8000) // twice as big as our largest enum
return -1;
for (i = 0; i < numitems; i++) {
// a pids_item is currently unsigned, but we'll protect our future
if (items[i] < 0)
return -1;
if (items[i] >= PROCPS_PIDS_logical_end) {
return -1;
}
}
return 0;
} // end: items_check_failed
static inline void libflags_set (
struct procps_pidsinfo *info)
{
enum pids_item e;
int i;
info->oldflags = info->history_yes = 0;
for (i = 0; i < info->curitems; i++) {
if (((e = info->items[i])) >= PROCPS_PIDS_logical_end)
break;
info->oldflags |= Item_table[e].oldflags;
info->history_yes |= Item_table[e].needhist;
}
if (info->oldflags & f_either) {
if (!(info->oldflags & f_stat))
info->oldflags |= f_status;
}
return;
} // end: libflags_set
static inline void oldproc_close (
PROCTAB **this)
{
if (*this != NULL) {
closeproc(*this);
*this = NULL;
}
} // end: oldproc_close
static inline int oldproc_open (
PROCTAB **this,
unsigned flags,
...)
{
va_list vl;
int *ids;
int num = 0;
if (*this == NULL) {
va_start(vl, flags);
ids = va_arg(vl, int*);
if (flags & PROC_UID) num = va_arg(vl, int);
va_end(vl);
if (NULL == (*this = openproc(flags, ids, num)))
return 0;
}
return 1;
} // end: oldproc_open
static inline int proc_tally (
struct procps_pidsinfo *info,
struct pids_counts *counts,
proc_t *p)
{
switch (p->state) {
case 'R':
++counts->running;
break;
case 'S':
case 'D':
++counts->sleeping;
break;
case 'T':
++counts->stopped;
break;
case 'Z':
++counts->zombied;
break;
default: // keep gcc happy
break;
}
++counts->total;
if (info->history_yes)
return !make_hist(info, p);
return 1;
} // end: proc_tally
/*
* stacks_alloc():
*
* Allocate and initialize one or more stacks each of which is anchored in an
* associated pids_stack structure.
*
* All such stacks will will have their result structures properly primed with
* 'items', while the result itself will be zeroed.
*
* Returns an array of pointers representing the 'heads' of each new stack.
*/
static struct stacks_extent *stacks_alloc (
struct procps_pidsinfo *info,
int maxstacks)
{
struct stacks_extent *p_blob;
struct pids_stack **p_vect;
struct pids_stack *p_head;
size_t vect_size, head_size, list_size, blob_size;
void *v_head, *v_list;
int i;
if (info == NULL || info->items == NULL)
return NULL;
if (maxstacks < 1)
return NULL;
vect_size = sizeof(void *) * maxstacks; // size of the addr vectors |
vect_size += sizeof(void *); // plus NULL addr delimiter |
head_size = sizeof(struct pids_stack); // size of that head struct |
list_size = sizeof(struct pids_result) * info->maxitems; // any single results stack |
blob_size = sizeof(struct stacks_extent); // the extent anchor itself |
blob_size += vect_size; // plus room for addr vects |
blob_size += head_size * maxstacks; // plus room for head thing |
blob_size += list_size * maxstacks; // plus room for our stacks |
/* note: all of our memory is allocated in a single blob, facilitating a later free(). |
as a minimum, it is important that the result structures themselves always be |
contiguous for every stack since they are accessed through relative position. | */
if (NULL == (p_blob = calloc(1, blob_size)))
return NULL;
p_blob->next = info->extents; // push this extent onto... |
info->extents = p_blob; // ...some existing extents |
p_vect = (void *)p_blob + sizeof(struct stacks_extent); // prime our vector pointer |
p_blob->stacks = p_vect; // set actual vectors start |
v_head = (void *)p_vect + vect_size; // prime head pointer start |
v_list = v_head + (head_size * maxstacks); // prime our stacks pointer |
for (i = 0; i < maxstacks; i++) {
p_head = (struct pids_stack *)v_head;
p_head->head = itemize_stack((struct pids_result *)v_list, info->curitems, info->items);
p_blob->stacks[i] = p_head;
v_list += list_size;
v_head += head_size;
}
p_blob->ext_numstacks = maxstacks;
return p_blob;
} // end: stacks_alloc
static int stacks_fetch (
struct procps_pidsinfo *info)
{
#define n_alloc info->fetch.n_alloc
#define n_inuse info->fetch.n_inuse
#define n_saved info->fetch.n_alloc_save
static proc_t task; // static for initial zeroes + later dynamic free(s)
struct stacks_extent *ext;
// initialize stuff -----------------------------------
if (!info->fetch.anchor) {
if (!(info->fetch.anchor = calloc(sizeof(void *), MEMORY_INCR)))
return -ENOMEM;
n_alloc = MEMORY_INCR;
}
if (!info->extents) {
if (!(ext = stacks_alloc(info, n_alloc)))
return -ENOMEM;
memset(info->fetch.anchor, 0, sizeof(void *) * n_alloc);
memcpy(info->fetch.anchor, ext->stacks, sizeof(void *) * n_alloc);
itemize_stacks_all(info);
}
cleanup_stacks_all(info);
toggle_history(info);
memset(&info->fetch.counts, 0, sizeof(struct pids_counts));
// iterate stuff --------------------------------------
n_inuse = 0;
while (info->read_something(info->fetch_PT, &task)) {
if (!(n_inuse < n_alloc)) {
n_alloc += MEMORY_INCR;
if ((!(info->fetch.anchor = realloc(info->fetch.anchor, sizeof(void *) * n_alloc)))
|| (!(ext = stacks_alloc(info, MEMORY_INCR))))
return -1;
memcpy(info->fetch.anchor + n_inuse, ext->stacks, sizeof(void *) * MEMORY_INCR);
}
if (!proc_tally(info, &info->fetch.counts, &task))
return -1;
assign_results(info, info->fetch.anchor[n_inuse++], &task);
}
// finalize stuff -------------------------------------
/* note: we go to this trouble of maintaining a duplicate of the consolidated |
extent stacks addresses represented as our 'anchor' since these ptrs |
are exposed to a user (um, not that we don't trust 'em or anything). |
plus, we can NULL delimit these ptrs which we couldn't do otherwise. | */
if (n_saved < n_inuse + 1) {
n_saved = n_inuse + 1;
if (!(info->fetch.results.stacks = realloc(info->fetch.results.stacks, sizeof(void *) * n_saved)))
return -ENOMEM;
}
memcpy(info->fetch.results.stacks, info->fetch.anchor, sizeof(void *) * n_inuse);
info->fetch.results.stacks[n_inuse] = NULL;
return n_inuse; // callers beware, this might be zero !
#undef n_alloc
#undef n_inuse
#undef n_saved
} // end: stacks_fetch
// ___ Public Functions |||||||||||||||||||||||||||||||||||||||||||||||||||||||
// --- standard required functions --------------------------------------------
/*
* procps_pids_new():
*
* @info: location of returned new structure
*
* Returns: 0 on success <0 on failure
*/
PROCPS_EXPORT int procps_pids_new (
struct procps_pidsinfo **info,
enum pids_item *items,
int numitems)
{
struct procps_pidsinfo *p;
double uptime_secs;
int pgsz;
if (info == NULL || *info != NULL)
return -EINVAL;
if (!(p = calloc(1, sizeof(struct procps_pidsinfo))))
return -ENOMEM;
/* if we're without items or numitems, a later call to
procps_pids_reset() will become mandatory */
if (items && numitems) {
if (items_check_failed(items, numitems)) {
free(p);
return -EINVAL;
}
// allow for our PROCPS_PIDS_logical_end
p->maxitems = numitems + 1;
if (!(p->items = calloc(p->maxitems, sizeof(enum pids_item)))) {
free(p);
return -ENOMEM;
}
memcpy(p->items, items, sizeof(enum pids_item) * numitems);
p->items[numitems] = PROCPS_PIDS_logical_end;
p->curitems = p->maxitems;
libflags_set(p);
}
if (!(p->hist = calloc(MEMORY_INCR, sizeof(struct history_info)))) {
free(p->items);
free(p);
return -ENOMEM;
}
config_history(p);
pgsz = getpagesize();
while (pgsz > 1024) { pgsz >>= 1; p->pgs2k_shift++; }
p->hertz = procps_hertz_get();
procps_uptime(&uptime_secs, NULL);
p->boot_seconds = uptime_secs;
p->fetch.results.counts = &p->fetch.counts;
p->refcount = 1;
*info = p;
return 0;
} // end: procps_pids_new
PROCPS_EXPORT int procps_pids_ref (
struct procps_pidsinfo *info)
{
if (info == NULL)
return -EINVAL;
info->refcount++;
return info->refcount;
} // end: procps_pids_ref
PROCPS_EXPORT int procps_pids_unref (
struct procps_pidsinfo **info)
{
if (info == NULL || *info == NULL)
return -EINVAL;
(*info)->refcount--;
if ((*info)->refcount == 0) {
#ifdef UNREF_RPTHASH
unref_rpthash(*info);
#endif
if ((*info)->extents) {
cleanup_stacks_all(*info);
do {
struct stacks_extent *p = (*info)->extents;
(*info)->extents = (*info)->extents->next;
free(p);
} while ((*info)->extents);
}
if ((*info)->otherexts) {
struct stacks_extent *nextext, *ext = (*info)->otherexts;
while (ext) {
nextext = ext->next;
cleanup_stack(ext->stacks[0]->head);
free(ext);
ext = nextext;
};
}
if ((*info)->fetch.anchor)
free((*info)->fetch.anchor);
if ((*info)->fetch.results.stacks)
free((*info)->fetch.results.stacks);
if ((*info)->items)
free((*info)->items);
if ((*info)->hist) {
free((*info)->hist->PHist_sav);
free((*info)->hist->PHist_new);
free((*info)->hist);
}
free(*info);
*info = NULL;
return 0;
}
return (*info)->refcount;
} // end: procps_pids_unref
// --- variable interface functions -------------------------------------------
PROCPS_EXPORT struct pids_stack *fatal_proc_unmounted (
struct procps_pidsinfo *info,
int return_self)
{
static proc_t self;
struct stacks_extent *ext;
/* this is very likely the *only* newlib function where the
context (procps_pidsinfo) of NULL will ever be permitted */
look_up_our_self(&self);
if (!return_self)
return NULL;
if (info == NULL)
return NULL;
/* with items & numitems technically optional at 'new' time, it's
expected 'reset' will have been called -- but just in case ... */
if (!info->curitems)
return NULL;
if (!(ext = stacks_alloc(info, 1)))
return NULL;
if (!extent_cut(info, ext))
return NULL;
ext->next = info->otherexts;
info->otherexts = ext;
assign_results(info, ext->stacks[0], &self);
return ext->stacks[0];
} // end: fatal_proc_unmounted
PROCPS_EXPORT struct pids_stack *procps_pids_get (
struct procps_pidsinfo *info,
enum pids_fetch_type which)
{
static proc_t task; // static for initial zeroes + later dynamic free(s)
if (info == NULL)
return NULL;
if (!info->curitems)
return NULL;
if (which != PROCPS_FETCH_TASKS_ONLY && which != PROCPS_FETCH_THREADS_TOO)
return NULL;
/* with items & numitems technically optional at 'new' time, it's
expected 'reset' will have been called -- but just in case ... */
if (!info->curitems)
return NULL;
fresh_start:
if (!info->get_ext) {
if (!(info->get_ext = stacks_alloc(info, 1)))
return NULL;
if (!oldproc_open(&info->get_PT, info->oldflags))
return NULL;
info->get_type = which;
info->read_something = which ? readeither : readproc;
}
if (info->get_type != which) {
oldproc_close(&info->get_PT);
cleanup_stack(info->get_ext->stacks[0]->head);
if (extent_cut(info, info->get_ext))
free(info->get_ext);
info->get_ext = NULL;
goto fresh_start;
}
cleanup_stack(info->get_ext->stacks[0]->head);
if (NULL == info->read_something(info->get_PT, &task))
return NULL;
assign_results(info, info->get_ext->stacks[0], &task);
return info->get_ext->stacks[0];
} // end: procps_pids_get
/* procps_pids_reap():
*
* Harvest all the available tasks/threads and provide the result
* stacks along with a summary of the information gathered.
*
* Returns: pointer to a pids_fetch struct on success, NULL on error.
*/
PROCPS_EXPORT struct pids_fetch *procps_pids_reap (
struct procps_pidsinfo *info,
enum pids_fetch_type which)
{
int rc;
if (info == NULL)
return NULL;
if (which != PROCPS_FETCH_TASKS_ONLY && which != PROCPS_FETCH_THREADS_TOO)
return NULL;
/* with items & numitems technically optional at 'new' time, it's
expected 'reset' will have been called -- but just in case ... */
if (!info->curitems)
return NULL;
if (!oldproc_open(&info->fetch_PT, info->oldflags))
return NULL;
info->read_something = which ? readeither : readproc;
rc = stacks_fetch(info);
oldproc_close(&info->fetch_PT);
// we better have found at least 1 pid
return (rc > 0) ? &info->fetch.results : NULL;
} // end: procps_pids_reap
PROCPS_EXPORT int procps_pids_reset (
struct procps_pidsinfo *info,
enum pids_item *newitems,
int newnumitems)
{
if (info == NULL || newitems == NULL)
return -EINVAL;
if (items_check_failed(newitems, newnumitems))
return -EINVAL;
/* shame on this caller, they didn't change anything. and unless they have
altered the depth of the stacks we're not gonna change anything either! */
if (info->curitems == newnumitems + 1
&& !memcmp(info->items, newitems, sizeof(enum pids_item) * newnumitems))
return 0;
if (info->maxitems < newnumitems + 1) {
if (info->dirty_stacks)
cleanup_stacks_all(info);
// allow for our PROCPS_PIDS_logical_end
info->maxitems = newnumitems + 1;
if (!(info->items = realloc(info->items, sizeof(enum pids_item) * info->maxitems)))
return -ENOMEM;
extents_free_all(info);
}
if (info->dirty_stacks)
cleanup_stacks_all(info);
memcpy(info->items, newitems, sizeof(enum pids_item) * newnumitems);
info->items[newnumitems] = PROCPS_PIDS_logical_end;
// account for above PROCPS_PIDS_logical_end
info->curitems = newnumitems + 1;
itemize_stacks_all(info);
libflags_set(info);
return 0;
} // end: procps_pids_reset
/* procps_pids_select():
*
* Harvest any processes matching the specified PID or UID and provide the
* result stacks along with a summary of the information gathered.
*
* Returns: pointer to a pids_fetch struct on success, NULL on error.
*/
PROCPS_EXPORT struct pids_fetch *procps_pids_select (
struct procps_pidsinfo *info,
unsigned *these,
int numthese,
enum pids_select_type which)
{
unsigned ids[FILL_ID_MAX + 1];
int rc;
if (info == NULL || these == NULL)
return NULL;
if (numthese < 1 || numthese > FILL_ID_MAX)
return NULL;
if (which != PROCPS_SELECT_PID && which != PROCPS_SELECT_UID)
return NULL;
/* with items & numitems technically optional at 'new' time, it's
expected 'reset' will have been called -- but just in case ... */
if (!info->curitems)
return NULL;
// this zero delimiter is really only needed with PROCPS_SELECT_PID
memcpy(ids, these, sizeof(unsigned) * numthese);
ids[numthese] = 0;
if (!oldproc_open(&info->fetch_PT, (info->oldflags | which), ids, numthese))
return NULL;
info->read_something = readproc;
rc = stacks_fetch(info);
oldproc_close(&info->fetch_PT);
// no guarantee any pids/uids were found
return (rc > -1) ? &info->fetch.results : NULL;
} // end: procps_pids_select
/*
* procps_pids_sort():
*
* Sort stacks anchored in the passed pids_stack pointers array
* based on the designated sort enumerator and specified order.
*
* Returns those same addresses sorted.
*
* Note: all of the stacks must be homogeneous (of equal length and content).
*/
PROCPS_EXPORT struct pids_stack **procps_pids_sort (
struct procps_pidsinfo *info,
struct pids_stack *stacks[],
int numstacked,
enum pids_item sortitem,
enum pids_sort_order order)
{
struct sort_parms parms;
struct pids_result *p;
int offset;
if (info == NULL || stacks == NULL)
return NULL;
// a pids_item is currently unsigned, but we'll protect our future
if (sortitem < 0 || sortitem >= PROCPS_PIDS_logical_end)
return NULL;
if (order != PROCPS_PIDS_ASCEND && order != PROCPS_PIDS_DESCEND)
return NULL;
if (numstacked < 2)
return stacks;
offset = 0;
p = stacks[0]->head;
for (;;) {
if (p->item == sortitem)
break;
++offset;
if (offset >= info->curitems)
return NULL;
if (p->item >= PROCPS_PIDS_logical_end)
return NULL;
++p;
}
parms.offset = offset;
parms.order = order;
qsort_r(stacks, numstacked, sizeof(void *), (QSR_t)Item_table[p->item].sortfunc, &parms);
return stacks;
} // end: procps_pids_sort
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