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Make shmid an 8-digit hex number

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This commit is contained in:
Alexey Rybalchenko
2020-06-29 12:00:29 +02:00
parent afe2dcaa02
commit 6dd0a44308
2 changed files with 7 additions and 4 deletions
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8
fairmq/shmem/Common.h
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@@ -12,7 +12,6 @@
#include <atomic>
#include <string>
#include <unordered_map>
#include <boost/interprocess/managed_shared_memory.hpp>
#include <boost/interprocess/allocators/allocator.hpp>
@@ -113,8 +112,11 @@ struct RegionBlock
inline std::string buildShmIdFromSessionIdAndUserId(const std::string& sessionId)
{
std::string seed((std::to_string(geteuid()) + sessionId));
std::string shmId = picosha2::hash256_hex_string(seed);
shmId.resize(10, '_');
// generate a 8-digit hex value out of sha256 hash
std::vector<unsigned char> hash(4);
picosha2::hash256(seed.begin(), seed.end(), hash.begin(), hash.end());
std::string shmId = picosha2::bytes_to_hex_string(hash.begin(), hash.end());
return shmId;
}