mirror of
https://github.com/openssl/openssl.git
synced 2024-12-21 06:09:35 +08:00
21 lines
748 B
Markdown
21 lines
748 B
Markdown
|
Notes on POSIX
|
||
|
|
==============
|
||
|
|
|
||
|
|
There are few instances where OpenSSL requires a POSIX C library, at least
|
||
|
|
version 1-2008, or compatible enough functionality.
|
||
|
|
|
||
|
|
There are exceptions, though, for platforms that do not have a POSIX
|
||
|
|
library, or where there are quirks that need working around. A notable
|
||
|
|
platform is Windows, where POSIX functionality may be available, but where
|
||
|
|
the function names are prefixed with an underscore, and where some POSIX
|
||
|
|
types are not present (such as `ssize_t`).
|
||
|
|
|
||
|
|
Platforms that do have a POSIX library may still not have them accessible
|
||
|
|
unless the following macros are defined:
|
||
|
|
|
||
|
|
_POSIX_C_SOURCE=200809L
|
||
|
|
_XOPEN_SOURCE=1
|
||
|
|
|
||
|
|
This is, for example, the case when building with gcc or clang and using the
|
||
|
|
flag `-ansi`.
|