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library: ensure that all those 'GET' macros are robust

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When users call the native 'get' functions they have a
responsibility to check that the result struct address
was indeed returned. But when using those 'GET' macros
there was no protection for possible NULL dereference.

So this patch will add some protection for a potential
failure of an underlying 'get' function. And should it
occur then those 'GET' macros will just return a zero.

Plus, we'll also mirror that behavior in the debugging
header should the XTRA_PROCPS_DEBUG #define be active.
And, we might as well add a warning when invalid items
are passed to 'GET' macros, just like we do for 'VAL'.

[ lastly, we added the missing opening parens/braces ]
[ to 2 'GET' macros in that xtra-procps-debug.h file ]
[ which went unnoticed until the qa folks caught up. ]

Signed-off-by: Jim Warner <james.warner@comcast.net>
This commit is contained in:
Jim Warner
2016-08-06 11:11:11 -05:00
committed by Craig Small
parent 105058ae2d
commit bef8c7fb70
11 changed files with 52 additions and 17 deletions
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24
proc/xtra-procps-debug.h
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@@ -35,8 +35,10 @@ struct diskstats_result *xtra_diskstats_get (
const char *file,
int lineno);
#define DISKSTATS_GET( info, name, actual_enum, type ) \
xtra_diskstats_get(info, name, actual_enum , STRINGIFY(type), __FILE__, __LINE__) -> result . type; } )
#define DISKSTATS_GET( info, name, actual_enum, type ) ( { \
struct diskstats_result *r; \
r = xtra_diskstats_get(info, name, actual_enum , STRINGIFY(type), __FILE__, __LINE__); \
r ? r->result . type : 0; } )
#endif // . . . . . . . . . .
#ifdef DISKSTATS_VAL
@@ -66,7 +68,9 @@ struct meminfo_result *xtra_meminfo_get (
int lineno);
#define MEMINFO_GET( info, actual_enum, type ) ( { \
xtra_meminfo_get(info, actual_enum , STRINGIFY(type), __FILE__, __LINE__) -> result . type; } )
struct meminfo_result *r; \
r = xtra_meminfo_get(info, actual_enum , STRINGIFY(type), __FILE__, __LINE__); \
r ? r->result . type : 0; } )
#endif // . . . . . . . . . .
#ifdef MEMINFO_VAL
@@ -112,8 +116,10 @@ struct slabinfo_result *xtra_slabinfo_get (
const char *file,
int lineno);
#define SLABINFO_GET( info, actual_enum, type ) \
xtra_slabinfo_get(info, actual_enum , STRINGIFY(type), __FILE__, __LINE__) -> result . type; } )
#define SLABINFO_GET( info, actual_enum, type ) ( { \
struct slabinfo_result *r; \
r = xtra_slabinfo_get(info, actual_enum , STRINGIFY(type), __FILE__, __LINE__); \
r ? r->result . type : 0; } )
#endif // . . . . . . . . . .
#ifdef SLABINFO_VAL
@@ -143,7 +149,9 @@ struct stat_result *xtra_stat_get (
int lineno);
#define STAT_GET( info, actual_enum, type ) ( { \
xtra_stat_get(info, actual_enum , STRINGIFY(type), __FILE__, __LINE__) -> result . type; } )
struct stat_result *r; \
r = xtra_stat_get(info, actual_enum , STRINGIFY(type), __FILE__, __LINE__); \
r ? r->result . type : 0; } )
#endif // . . . . . . . . . .
#ifdef STAT_VAL
@@ -173,7 +181,9 @@ struct vmstat_result *xtra_vmstat_get (
int lineno);
#define VMSTAT_GET( info, actual_enum, type ) ( { \
xtra_vmstat_get(info, actual_enum , STRINGIFY(type), __FILE__, __LINE__) -> result . type; } )
struct vmstat_result *r; \
r = xtra_vmstat_get(info, actual_enum , STRINGIFY(type), __FILE__, __LINE__); \
r ? r->result . type : 0; } )
#endif // . . . . . . . . . .
#ifdef VMSTAT_VAL