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library: introduced 'Item_table' validation provisions 

The recent work on updating the <meminfo> and <vmstat>
modules with some newly added linux fields reminded me
(again) of a need for some mechanism guaranteeing that
a header file agrees with the source file assumptions.

Sadly, in the past, if a table entry was omitted or if
the table and header are ordered differently, then the
library would silently return the wrong results values
or even potentially experience a SIGSEGV abnormal end.

This patch offers a much needed development assist for
ensuring that Item_table entries are synchronized with
header file enumerators in terms of number plus order.

It's intended solely for our use as libprocps evolves.

Now, by activating ITEMTABLE_DEBUG, either directly or
via ./configure CFLAGS='-DITEMTABLE_DEBUG', the number
and order will be verified. It is envisioned that this
feature will be used at least once prior to a release.

Signed-off-by: Jim Warner <james.warner@comcast.net>
This commit is contained in:
Jim Warner 2020-08-10 00:00:00 -05:00 committed by Craig Small
parent c865b06c30
commit 92d0297e1e
6 changed files with 199 additions and 23 deletions
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36
proc/diskstats.c
View File

@ -50,6 +50,14 @@
#define STACKS_INCR 64 // amount reap stack allocations grow
#define STR_COMPARE strverscmp
/* ----------------------------------------------------------------------- +
this provision can help ensure that our Item_table remains synchronized |
with the enumerators found in the associated header file. It's intended |
to only be used locally (& temporarily) at some point before a release! | */
// #define ITEMTABLE_DEBUG //--------------------------------------------- |
// ----------------------------------------------------------------------- +
struct dev_data {
unsigned long reads;
unsigned long reads_merged;
@ -200,7 +208,11 @@ srtDECL(noop) { \
// ___ Controlling Table ||||||||||||||||||||||||||||||||||||||||||||||||||||||
typedef void (*SET_t)(struct diskstats_result *, struct dev_node *);
#ifdef ITEMTABLE_DEBUG
#define RS(e) (SET_t)setNAME(e), DISKSTATS_ ## e, STRINGIFY(DISKSTATS_ ## e)
#else
#define RS(e) (SET_t)setNAME(e)
#endif
typedef int (*QSR_t)(const void *, const void *, void *);
#define QS(t) (QSR_t)srtNAME(t)
@ -214,6 +226,10 @@ typedef int (*QSR_t)(const void *, const void *, void *);
* those *enum diskstats_item* guys ! */
static struct {
SET_t setsfunc; // the actual result setting routine
#ifdef ITEMTABLE_DEBUG
int enumnumb; // enumerator (must match position!)
char *enum2str; // enumerator name as a char* string
#endif
QSR_t sortfunc; // sort cmp func for a specific type
char *type2str; // the result type as a string value
} Item_table[] = {
@ -250,9 +266,6 @@ static struct {
{ RS(DELTA_WRITE_TIME), QS(s_int), TS(s_int) },
{ RS(DELTA_IO_TIME), QS(s_int), TS(s_int) },
{ RS(DELTA_WEIGHTED_TIME), QS(s_int), TS(s_int) },
// dummy entry corresponding to DISKSTATS_logical_end ...
{ NULL, NULL, NULL }
};
/* please note,
@ -703,6 +716,23 @@ PROCPS_EXPORT int procps_diskstats_new (
{
struct diskstats_info *p;
#ifdef ITEMTABLE_DEBUG
int i, failed = 0;
for (i = 0; i < MAXTABLE(Item_table); i++) {
if (i != Item_table[i].enumnumb) {
fprintf(stderr, "%s: enum/table error: Item_table[%d] was %s, but its value is %d\n"
, __FILE__, i, Item_table[i].enum2str, Item_table[i].enumnumb);
failed = 1;
}
}
if (i != DISKSTATS_logical_end) {
fprintf(stderr, "%s: DISKSTATS_logical_end is %d, expected %d\n"
, __FILE__, DISKSTATS_logical_end, i);
failed = 1;
}
if (failed) _Exit(EXIT_FAILURE);
#endif
if (info == NULL)
return -EINVAL;
if (!(p = calloc(1, sizeof(struct diskstats_info))))

35
proc/meminfo.c
View File

@ -35,6 +35,13 @@
#define MEMINFO_FILE "/proc/meminfo"
#define MEMINFO_BUFF 8192
/* ------------------------------------------------------------------------- +
this provision can be used to ensure that our Item_table was synchronized |
with those enumerators found in the associated header file. It's intended |
to only be used locally (& temporarily) at some point prior to a release! | */
// #define ITEMTABLE_DEBUG //----------------------------------------------- |
// ------------------------------------------------------------------------- +
struct meminfo_data {
unsigned long Active;
@ -284,7 +291,11 @@ HST_set(SWAP_DELTA_USED, s_int, derived_swap_used)
// ___ Controlling Table ||||||||||||||||||||||||||||||||||||||||||||||||||||||
typedef void (*SET_t)(struct meminfo_result *, struct mem_hist *);
#ifdef ITEMTABLE_DEBUG
#define RS(e) (SET_t)setNAME(e), MEMINFO_ ## e, STRINGIFY(MEMINFO_ ## e)
#else
#define RS(e) (SET_t)setNAME(e)
#endif
#define TS(t) STRINGIFY(t)
#define TS_noop ""
@ -295,6 +306,10 @@ typedef void (*SET_t)(struct meminfo_result *, struct mem_hist *);
* those 'enum meminfo_item' guys ! */
static struct {
SET_t setsfunc; // the actual result setting routine
#ifdef ITEMTABLE_DEBUG
int enumnumb; // enumerator (must match position!)
char *enum2str; // enumerator name as a char* string
#endif
char *type2str; // the result type as a string value
} Item_table[] = {
/* setsfunc type2str
@ -435,9 +450,6 @@ static struct {
{ RS(SWAP_DELTA_FREE), TS(s_int) },
{ RS(SWAP_DELTA_TOTAL), TS(s_int) },
{ RS(SWAP_DELTA_USED), TS(s_int) },
// dummy entry corresponding to MEMINFO_logical_end ...
{ NULL, NULL }
};
/* please note,
@ -787,6 +799,23 @@ PROCPS_EXPORT int procps_meminfo_new (
{
struct meminfo_info *p;
#ifdef ITEMTABLE_DEBUG
int i, failed = 0;
for (i = 0; i < MAXTABLE(Item_table); i++) {
if (i != Item_table[i].enumnumb) {
fprintf(stderr, "%s: enum/table error: Item_table[%d] was %s, but its value is %d\n"
, __FILE__, i, Item_table[i].enum2str, Item_table[i].enumnumb);
failed = 1;
}
}
if (i != MEMINFO_logical_end) {
fprintf(stderr, "%s: MEMINFO_logical_end is %d, expected %d\n"
, __FILE__, MEMINFO_logical_end, i);
failed = 1;
}
if (failed) _Exit(EXIT_FAILURE);
#endif
if (info == NULL || *info != NULL)
return -EINVAL;
if (!(p = calloc(1, sizeof(struct meminfo_info))))

35
proc/pids.c
View File

@ -52,6 +52,13 @@
#define STACKS_INCR 128 // amount reap stack allocations grow
#define NEWOLD_INCR 128 // amt by which hist allocations grow
/* ------------------------------------------------------------------------- +
this provision can be used to ensure that our Item_table was synchronized |
with those enumerators found in the associated header file. It's intended |
to only be used locally (& temporarily) at some point prior to a release! | */
// #define ITEMTABLE_DEBUG //----------------------------------------------- |
// ------------------------------------------------------------------------- +
struct stacks_extent {
int ext_numstacks;
@ -357,7 +364,11 @@ typedef void (*SET_t)(struct pids_info *, struct pids_result *, proc_t *);
typedef void (*FRE_t)(struct pids_result *);
typedef int (*QSR_t)(const void *, const void *, void *);
#ifdef ITEMTABLE_DEBUG
#define RS(e) (SET_t)setNAME(e), PIDS_ ## e, STRINGIFY(PIDS_ ## e)
#else
#define RS(e) (SET_t)setNAME(e)
#endif
#define FF(t) (FRE_t)freNAME(t)
#define QS(t) (QSR_t)srtNAME(t)
#define TS(t) STRINGIFY(t)
@ -369,6 +380,10 @@ typedef int (*QSR_t)(const void *, const void *, void *);
* those 'enum pids_item' guys ! */
static struct {
SET_t setsfunc; // the actual result setting routine
#ifdef ITEMTABLE_DEBUG
int enumnumb; // enumerator (must match position!)
char *enum2str; // enumerator name as a char* string
#endif
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
@ -499,9 +514,6 @@ static struct {
{ RS(VM_USED), f_status, NULL, QS(ul_int), 0, TS(ul_int) },
{ RS(VSIZE_PGS), f_stat, NULL, QS(ul_int), 0, TS(ul_int) },
{ RS(WCHAN_NAME), 0, FF(str), QS(str), 0, TS(str) }, // oldflags: tid already free
// dummy entry corresponding to PIDS_logical_end ...
{ NULL, 0, NULL, NULL, 0, NULL }
};
/* please note,
@ -1116,6 +1128,23 @@ PROCPS_EXPORT int procps_pids_new (
double uptime_secs;
int pgsz;
#ifdef ITEMTABLE_DEBUG
int i, failed = 0;
for (i = 0; i < MAXTABLE(Item_table); i++) {
if (i != Item_table[i].enumnumb) {
fprintf(stderr, "%s: enum/table error: Item_table[%d] was %s, but its value is %d\n"
, __FILE__, i, Item_table[i].enum2str, Item_table[i].enumnumb);
failed = 1;
}
}
if (i != PIDS_logical_end) {
fprintf(stderr, "%s: PIDS_logical_end is %d, expected %d\n"
, __FILE__, PIDS_logical_end, i);
failed = 1;
}
if (failed) _Exit(EXIT_FAILURE);
#endif
if (info == NULL || *info != NULL)
return -EINVAL;
if (!(p = calloc(1, sizeof(struct pids_info))))

45
proc/slabinfo.c
View File

@ -47,6 +47,13 @@
#define STACKS_INCR 128 // amount reap stack allocations grow
/* ---------------------------------------------------------------------------- +
this #define will be used to help ensure that our Item_table is synchronized |
with all the enumerators found in the associated header file. It is intended |
to only be defined locally (and temporarily) at some point prior to release! | */
// #define ITEMTABLE_DEBUG //-------------------------------------------------- |
// ---------------------------------------------------------------------------- +
/*
Because 'select' could, at most, return only node[0] values and since 'reap' |
would be forced to duplicate global slabs stuff in every node results stack, |
@ -134,7 +141,7 @@ struct slabinfo_info {
// ___ Results 'Set' Support ||||||||||||||||||||||||||||||||||||||||||||||||||
#define setNAME(e) set_slabinfo_ ## e
#define setNAME(e) set_ ## e
#define setDECL(e) static void setNAME(e) \
(struct slabinfo_result *R, struct slabs_hist *S, struct slabs_node *N)
@ -144,8 +151,8 @@ struct slabinfo_info {
// delta assignment
#define HST_set(e,t,x) setDECL(e) { (void)N; R->result. t = (signed long)S->new. x - S->old. x; }
setDECL(noop) { (void)R; (void)S; (void)N; }
setDECL(extra) { (void)S; (void)N; R->result.ul_int = 0; }
setDECL(SLABINFO_noop) { (void)R; (void)S; (void)N; }
setDECL(SLABINFO_extra) { (void)S; (void)N; R->result.ul_int = 0; }
NOD_set(SLAB_NAME, str, name)
NOD_set(SLAB_NUM_OBJS, u_int, nr_objs)
@ -234,7 +241,11 @@ srtDECL(noop) { \
// ___ Controlling Table ||||||||||||||||||||||||||||||||||||||||||||||||||||||
typedef void (*SET_t)(struct slabinfo_result *, struct slabs_hist *, struct slabs_node *);
#ifdef ITEMTABLE_DEBUG
#define RS(e) (SET_t)setNAME(e), e, STRINGIFY(e)
#else
#define RS(e) (SET_t)setNAME(e)
#endif
typedef int (*QSR_t)(const void *, const void *, void *);
#define QS(t) (QSR_t)srtNAME(t)
@ -248,13 +259,17 @@ typedef int (*QSR_t)(const void *, const void *, void *);
* those *enum slabinfo_item* guys ! */
static struct {
SET_t setsfunc; // the actual result setting routine
#ifdef ITEMTABLE_DEBUG
int enumnumb; // enumerator (must match position!)
char *enum2str; // enumerator name as a char* string
#endif
QSR_t sortfunc; // sort cmp func for a specific type
char *type2str; // the result type as a string value
} Item_table[] = {
/* setsfunc sortfunc type2str
------------------------------ ----------- ---------- */
{ RS(noop), QS(noop), TS_noop },
{ RS(extra), QS(ul_int), TS_noop },
{ RS(SLABINFO_noop), QS(noop), TS_noop },
{ RS(SLABINFO_extra), QS(ul_int), TS_noop },
{ RS(SLAB_NAME), QS(str), TS(str) },
{ RS(SLAB_NUM_OBJS), QS(u_int), TS(u_int) },
@ -292,9 +307,6 @@ static struct {
{ RS(SLABS_DELTA_PAGES_TOTAL), QS(noop), TS(s_int) },
{ RS(SLABS_DELTA_SIZE_ACTIVE), QS(noop), TS(s_int) },
{ RS(SLABS_DELTA_SIZE_TOTAL), QS(noop), TS(s_int) },
// dummy entry corresponding to SLABINFO_logical_end ...
{ NULL, NULL, NULL }
};
/* please note,
@ -732,6 +744,23 @@ PROCPS_EXPORT int procps_slabinfo_new (
{
struct slabinfo_info *p;
#ifdef ITEMTABLE_DEBUG
int i, failed = 0;
for (i = 0; i < MAXTABLE(Item_table); i++) {
if (i != Item_table[i].enumnumb) {
fprintf(stderr, "%s: enum/table error: Item_table[%d] was %s, but its value is %d\n"
, __FILE__, i, Item_table[i].enum2str, Item_table[i].enumnumb);
failed = 1;
}
}
if (i != SLABINFO_logical_end) {
fprintf(stderr, "%s: SLABINFO_logical_end is %d, expected %d\n"
, __FILE__, SLABINFO_logical_end, i);
failed = 1;
}
if (failed) _Exit(EXIT_FAILURE);
#endif
if (info == NULL || *info != NULL)
return -EINVAL;
if (!(p = calloc(1, sizeof(struct slabinfo_info))))

35
proc/stat.c
View File

@ -39,6 +39,13 @@
#define STACKS_INCR 64 // amount reap stack allocations grow
#define NEWOLD_INCR 64 // amount jiffs hist allocations grow
/* ------------------------------------------------------------------------- +
this provision can be used to ensure that our Item_table was synchronized |
with those enumerators found in the associated header file. It's intended |
to only be used locally (& temporarily) at some point prior to a release! | */
// #define ITEMTABLE_DEBUG //----------------------------------------------- |
// ------------------------------------------------------------------------- +
/* ------------------------------------------------------------------------- +
because 'reap' would be forced to duplicate the global SYS stuff in every |
TIC type results stack, the following #define can be used to enforce that |
@ -267,7 +274,11 @@ srtDECL(noop) { \
// ___ Controlling Table ||||||||||||||||||||||||||||||||||||||||||||||||||||||
typedef void (*SET_t)(struct stat_result *, struct hist_sys *, struct hist_tic *);
#ifdef ITEMTABLE_DEBUG
#define RS(e) (SET_t)setNAME(e), STAT_ ## e, STRINGIFY(STAT_ ## e)
#else
#define RS(e) (SET_t)setNAME(e)
#endif
typedef int (*QSR_t)(const void *, const void *, void *);
#define QS(t) (QSR_t)srtNAME(t)
@ -281,6 +292,10 @@ typedef int (*QSR_t)(const void *, const void *, void *);
* those 'enum stat_item' guys ! */
static struct {
SET_t setsfunc; // the actual result setting routine
#ifdef ITEMTABLE_DEBUG
int enumnumb; // enumerator (must match position!)
char *enum2str; // enumerator name as a char* string
#endif
QSR_t sortfunc; // sort cmp func for a specific type
char *type2str; // the result type as a string value
} Item_table[] = {
@ -338,9 +353,6 @@ static struct {
{ RS(SYS_DELTA_PROC_BLOCKED), QS(s_int), TS(s_int) },
{ RS(SYS_DELTA_PROC_CREATED), QS(s_int), TS(s_int) },
{ RS(SYS_DELTA_PROC_RUNNING), QS(s_int), TS(s_int) },
// dummy entry corresponding to STAT_logical_end ...
{ NULL, NULL, NULL }
};
/* please note,
@ -854,6 +866,23 @@ PROCPS_EXPORT int procps_stat_new (
{
struct stat_info *p;
#ifdef ITEMTABLE_DEBUG
int i, failed = 0;
for (i = 0; i < MAXTABLE(Item_table); i++) {
if (i != Item_table[i].enumnumb) {
fprintf(stderr, "%s: enum/table error: Item_table[%d] was %s, but its value is %d\n"
, __FILE__, i, Item_table[i].enum2str, Item_table[i].enumnumb);
failed = 1;
}
}
if (i != STAT_logical_end) {
fprintf(stderr, "%s: STAT_logical_end is %d, expected %d\n"
, __FILE__, STAT_logical_end, i);
failed = 1;
}
if (failed) _Exit(EXIT_FAILURE);
#endif
if (info == NULL || *info != NULL)
return -EINVAL;
if (!(p = calloc(1, sizeof(struct stat_info))))

36
proc/vmstat.c
View File

@ -41,6 +41,14 @@
#define VMSTAT_FILE "/proc/vmstat"
#define VMSTAT_BUFF 8192
/* ------------------------------------------------------------- +
this provision can be used to help ensure that our Item_table |
was synchronized with the enumerators found in the associated |
header file. It's intended to be used locally (& temporarily) |
at least once at some point prior to publishing new releases! | */
// #define ITEMTABLE_DEBUG //----------------------------------- |
// ------------------------------------------------------------- +
/*
* Perhaps someday we'll all learn what is in these fields. But |
* that might require available linux documentation progressing |
@ -557,7 +565,11 @@ HST_set(DELTA_ZONE_RECLAIM_FAILED, zone_reclaim_failed)
// ___ Controlling Table ||||||||||||||||||||||||||||||||||||||||||||||||||||||
typedef void (*SET_t)(struct vmstat_result *, struct vmstat_hist *);
#ifdef ITEMTABLE_DEBUG
#define RS(e) (SET_t)setNAME(e), VMSTAT_ ## e, STRINGIFY(VMSTAT_ ## e)
#else
#define RS(e) (SET_t)setNAME(e)
#endif
#define TS(t) STRINGIFY(t)
#define TS_noop ""
@ -568,6 +580,10 @@ typedef void (*SET_t)(struct vmstat_result *, struct vmstat_hist *);
* those 'enum vmstat_item' guys ! */
static struct {
SET_t setsfunc; // the actual result setting routine
#ifdef ITEMTABLE_DEBUG
int enumnumb; // enumerator (must match position!)
char *enum2str; // enumerator name as a char* string
#endif
char *type2str; // the result type as a string value
} Item_table[] = {
/* setsfunc type2str
@ -878,9 +894,6 @@ static struct {
{ RS(DELTA_WORKINGSET_REFAULT), TS(sl_int) },
{ RS(DELTA_WORKINGSET_RESTORE), TS(sl_int) },
{ RS(DELTA_ZONE_RECLAIM_FAILED), TS(sl_int) },
// dummy entry corresponding to VMSTAT_logical_end ...
{ NULL, NULL }
};
/* please note,
@ -1283,6 +1296,23 @@ PROCPS_EXPORT int procps_vmstat_new (
{
struct vmstat_info *p;
#ifdef ITEMTABLE_DEBUG
int i, failed = 0;
for (i = 0; i < MAXTABLE(Item_table); i++) {
if (i != Item_table[i].enumnumb) {
fprintf(stderr, "%s: enum/table error: Item_table[%d] was %s, but its value is %d\n"
, __FILE__, i, Item_table[i].enum2str, Item_table[i].enumnumb);
failed = 1;
}
}
if (i != VMSTAT_logical_end) {
fprintf(stderr, "%s: VMSTAT_logical_end is %d, expected %d\n"
, __FILE__, VMSTAT_logical_end, i);
failed = 1;
}
if (failed) _Exit(EXIT_FAILURE);
#endif
if (info == NULL || *info != NULL)
return -EINVAL;
if (!(p = calloc(1, sizeof(struct vmstat_info))))