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| author | Thiago Macieira <thiago.macieira@intel.com> | 2017-06-16 21:39:04 -0700 |
|---|---|---|
| committer | Thiago Macieira <thiago.macieira@intel.com> | 2017-06-30 21:19:10 +0000 |
| commit | 120ecc976fc3d5504d234702f68c2ad3898b77a4 (patch) | |
| tree | bfd8b6248a3e1d1e1cd90ab5f29e2bf4012aca79 /src/corelib/global/qconfig-bootstrapped.h | |
| parent | 078f04254e1ab7e4e7cb4b7ff5f371ab22a020cc (diff) | |
QRandomGenerator: use getentropy on Linux & OpenBSD
The getentropy function, first found in OpenBSD, is present in glibc
since version 2.25 and Bionic since Android 6.0 and NDK r11. It uses the
Linux 3.17 getrandom system call. Unlike glibc's getrandom() wrapper,
the glibc implementation of getentropy() function is not a POSIX thread
cancellation point, so we prefer to use that even though we have to
break the reading into 256-byte blocks.
The big advantage is that these functions work even in the absence of a
/dev/urandom device node, in addition to a few cycles shaved off by not
having to open a file descriptor and close it at exit. What's more, the
glibc implementation blocks until entropy is available on early boot, so
we don't have to worry about a failure mode. The Bionic implementation
will fall back by itself to /dev/urandom and, failing that, gathering
entropy from elsewhere in the system in a way it cannot fail either.
uClibc has a wrapper to getrandom(2) but no getentropy(3). MUSL has
neither.
Change-Id: Ia53158e207a94bf49489fffd14c8cee1b968a619
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Diffstat (limited to 'src/corelib/global/qconfig-bootstrapped.h')
| -rw-r--r-- | src/corelib/global/qconfig-bootstrapped.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/src/corelib/global/qconfig-bootstrapped.h b/src/corelib/global/qconfig-bootstrapped.h index a6a56b5d59..7dba4ae5da 100644 --- a/src/corelib/global/qconfig-bootstrapped.h +++ b/src/corelib/global/qconfig-bootstrapped.h @@ -76,6 +76,7 @@ # define QT_FEATURE_alloca_malloc_h -1 #endif #define QT_FEATURE_cxx11_random (QT_HAS_INCLUDE(<random>) ? 1 : -1) +#define QT_FEATURE_getentropy -1 #define QT_FEATURE_iconv -1 #define QT_FEATURE_icu -1 #define QT_FEATURE_journald -1 |