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DEBUG: tools: add vma_set_name_id() helper

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Just like vma_set_name() from 51a8f134e ("DEBUG: tools: add vma_set_name()
helper"), but also takes <id> as parameter to append "-$id" suffix after
the name in order to differentiate 2 areas that were named using the same
<type> and <name> combination.

example, using mmap + MAP_SHARED|MAP_ANONYMOUS:
  7364c4fff000-736508000000 rw-s 00000000 00:01 3540  [anon_shmem:type:name-id]
Another example, using mmap + MAP_PRIVATE|MAP_ANONYMOUS or using
glibc/malloc() above MMAP_THRESHOLD:
  7364c4fff000-736508000000 rw-s 00000000 00:01 3540  [anon:type:name-id]
This commit is contained in:
Aurelien DARRAGON 2024-05-24 10:29:08 +02:00
parent 23814a44e5
commit 9d37c4b989
2 changed files with 16 additions and 4 deletions
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1
include/haproxy/tools.h
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@ -1201,5 +1201,6 @@ int openssl_compare_current_name(const char *name);
/* vma helpers */
void vma_set_name(void *addr, size_t size, const char *type, const char *name);
void vma_set_name_id(void *addr, size_t size, const char *type, const char *name, unsigned int id);
#endif /* _HAPROXY_TOOLS_H */

19
src/tools.c
View File

@ -6477,11 +6477,13 @@ int openssl_compare_current_name(const char *name)
* heap as much as possible below that.
*
* <type> and <name> are mandatory
* <id> is optional, if != ~0, will be used to append an id after the name
* in order to differentiate 2 entries set using the same <type> and <name>
*
* The function does nothing if naming API is not available, and naming errors
* are ignored.
*/
void vma_set_name(void *addr, size_t size, const char *type, const char *name)
void vma_set_name_id(void *addr, size_t size, const char *type, const char *name, unsigned int id)
{
long pagesize = sysconf(_SC_PAGESIZE);
void *aligned_addr;
@ -6515,15 +6517,18 @@ void vma_set_name(void *addr, size_t size, const char *type, const char *name)
* except [, ], \, $ and '.
* As a result, when looking for /proc/<pid>/maps, we can see the anonymous range
* as follow :
* `7364c4fff000-736508000000 rw-s 00000000 00:01 3540 [anon_shmem:scope:name]`
* `7364c4fff000-736508000000 rw-s 00000000 00:01 3540 [anon_shmem:scope:name{-id}]`
* (MAP_SHARED)
* `7364c4fff000-736508000000 rw-s 00000000 00:01 3540 [anon:scope:name]`
* `7364c4fff000-736508000000 rw-s 00000000 00:01 3540 [anon:scope:name{-id}]`
* (MAP_PRIVATE)
*/
char fullname[80];
int rn;
rn = snprintf(fullname, sizeof(fullname), "%s:%s", type, name);
if (id != ~0)
rn = snprintf(fullname, sizeof(fullname), "%s:%s-%u", type, name, id);
else
rn = snprintf(fullname, sizeof(fullname), "%s:%s", type, name);
if (rn >= 0) {
/* Give a name to the map by setting PR_SET_VMA_ANON_NAME attribute
@ -6541,6 +6546,12 @@ void vma_set_name(void *addr, size_t size, const char *type, const char *name)
#endif
}
/* wrapper for vma_set_name_id() but without id */
void vma_set_name(void *addr, size_t size, const char *type, const char *name)
{
vma_set_name_id(addr, size, type, name, ~0);
}
#if defined(RTLD_DEFAULT) || defined(RTLD_NEXT)
/* redefine dlopen() so that we can detect unexpected replacement of some
* critical symbols, typically init/alloc/free functions coming from alternate