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| author | Lennart Poettering <lennart@poettering.net> | 2015-11-01 20:28:55 +0100 |
|---|---|---|
| committer | Lennart Poettering <lennart@poettering.net> | 2015-11-02 23:07:20 +0100 |
| commit | 9fe4ea21bec739bfe0ebac5565f0539b0e25b317 (patch) | |
| tree | 4147053da096c3dacbef1a976b29c9add5c39c95 /.gitignore | |
| parent | Merge pull request #1690 from evverx/run-runtime-directory (diff) | |
| download | systemd-9fe4ea21bec739bfe0ebac5565f0539b0e25b317.tar.xz systemd-9fe4ea21bec739bfe0ebac5565f0539b0e25b317.zip | |
string-util: rework memory_erase() so that it cannot be optimized away
memory_erase() so far just called memset(), which the compiler might
optimize away under certain conditions if it feels there's benefit in
it. C11 knows a new memset_s() call that is like memset(), but may not
be optimized away. Ideally, we'd just use that call, but glibc currently
does not support it. Hence, implement our own simplistic version of it.
We use a GCC pragma to turn off optimization for this call, and also use
the "volatile" keyword on the pointers to ensure that gcc will use the
pointers as-is. According to a variety of internet sources, either one
does the trick. However, there are also reports that at least the
volatile thing isn't fully correct, hence let's add some snake oil and
employ both techniques.
https://news.ycombinator.com/item?id=4711346
Diffstat (limited to '.gitignore')
| -rw-r--r-- | .gitignore | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/.gitignore b/.gitignore index 7abe8e7dae..1c006b53f8 100644 --- a/.gitignore +++ b/.gitignore @@ -256,6 +256,7 @@ /test-socket-util /test-ssd /test-strbuf +/test-string-util /test-strip-tab-ansi /test-strv /test-strxcpyx |