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Add a comment #35919

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This commit is contained in:
Alexey Milovidov 2022-04-05 18:35:23 +02:00
parent e452949334
commit 3c0c1a1176
1 changed files with 14 additions and 0 deletions
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14
programs/client/Client.cpp
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@ -163,9 +163,23 @@ void Client::initialize(Poco::Util::Application & self)
configReadClient(config(), home_path);
/** getenv is thread-safe in Linux glibc and in all sane libc implementations.
* But the standard does not guarantee that subsequent calls will not rewrite the value by returned pointer.
*
* man getenv:
*
* As typically implemented, getenv() returns a pointer to a string within the environment list.
* The caller must take care not to modify this string, since that would change the environment of
* the process.
*
* The implementation of getenv() is not required to be reentrant. The string pointed to by the return value of getenv()
* may be statically allocated, and can be modified by a subsequent call to getenv(), putenv(3), setenv(3), or unsetenv(3).
*/
const char * env_user = getenv("CLICKHOUSE_USER");
if (env_user)
config().setString("user", env_user);
const char * env_password = getenv("CLICKHOUSE_PASSWORD");
if (env_password)
config().setString("password", env_password);