200809 is equivalent to the _POSIX_VERSION definition

Or the same as VER in sysconf.c. Also add a few TODO items.

Author: kleisauke

src/library.js

@@ -337,7 +337,7 @@ LibraryManager.library = {
       case {{{ cDefine('_SC_2_LOCALEDEF') }}}:
       case {{{ cDefine('_SC_2_SW_DEV') }}}:
       case {{{ cDefine('_SC_2_VERSION') }}}:
-        return 200809;
+        return {{{ cDefine('_POSIX_VERSION') }}};
       case {{{ cDefine('_SC_MQ_OPEN_MAX') }}}:
       case {{{ cDefine('_SC_XOPEN_STREAMS') }}}:
       case {{{ cDefine('_SC_XBS5_LP64_OFF64') }}}:

src/struct_info.json

@@ -512,6 +512,7 @@
     {
         "file": "unistd.h",
         "defines": [
+            "_POSIX_VERSION",
             "_SC_XOPEN_LEGACY",
             "_SC_XOPEN_VERSION",
             "_SC_BC_DIM_MAX",

system/lib/libc/musl/src/conf/sysconf.c

@@ -34,12 +34,12 @@ long sysconf(int name)
 		[_SC_TZNAME_MAX] = TZNAME_MAX,
 		[_SC_JOB_CONTROL] = 1,
 		[_SC_SAVED_IDS] = 1,
-		[_SC_REALTIME_SIGNALS] = 200809, // XXX EMSCRIPTEN replace VER,
-		[_SC_PRIORITY_SCHEDULING] = 200809, // XXX EMSCRIPTEN replace -1,
+		[_SC_REALTIME_SIGNALS] = VER,
+		[_SC_PRIORITY_SCHEDULING] = VER, // XXX EMSCRIPTEN replace -1, // TODO(kleisauke): We don't support priority scheduling.
 		[_SC_TIMERS] = VER,
 		[_SC_ASYNCHRONOUS_IO] = VER,
 		[_SC_PRIORITIZED_IO] = VER, // XXX EMSCRIPTEN replace -1
-		[_SC_SYNCHRONIZED_IO] = 200809, // XXX EMSCRIPTEN replace -1,
+		[_SC_SYNCHRONIZED_IO] = VER, // XXX EMSCRIPTEN replace -1,
 		[_SC_FSYNC] = VER,
 		[_SC_MAPPED_FILES] = VER,
 		[_SC_MEMLOCK] = VER,
@@ -71,11 +71,11 @@ long sysconf(int name)
 		[_SC_RE_DUP_MAX] = 32767, // XXX EMSCRIPTEN replace RE_DUP_MAX,
 		[_SC_2_VERSION] = VER,
 		[_SC_2_C_BIND] = VER,
-		[_SC_2_C_DEV] = 200809, // XXX EMSCRIPTEN replace -1,
+		[_SC_2_C_DEV] = VER, // XXX EMSCRIPTEN replace -1,
 		[_SC_2_FORT_DEV] = -1,
 		[_SC_2_FORT_RUN] = -1,
-		[_SC_2_SW_DEV] = 200809, // XXX EMSCRIPTEN replace -1,
-		[_SC_2_LOCALEDEF] = 200809, // XXX EMSCRIPTEN replace -1,
+		[_SC_2_SW_DEV] = VER, // XXX EMSCRIPTEN replace -1,
+		[_SC_2_LOCALEDEF] = VER, // XXX EMSCRIPTEN replace -1,
 		[_SC_IOV_MAX] = IOV_MAX,
 		[_SC_THREADS] = VER,
 		[_SC_THREAD_SAFE_FUNCTIONS] = VER,
@@ -84,8 +84,8 @@ long sysconf(int name)
 		[_SC_LOGIN_NAME_MAX] = 256,
 		[_SC_TTY_NAME_MAX] = TTY_NAME_MAX,
 		[_SC_THREAD_DESTRUCTOR_ITERATIONS] = PTHREAD_DESTRUCTOR_ITERATIONS,
-		[_SC_THREAD_KEYS_MAX] = 1024, // XXX EMSCRIPTEN replace PTHREAD_KEYS_MAX,
-		[_SC_THREAD_STACK_MIN] = 16384, // XXX EMSCRIPTEN replace PTHREAD_STACK_MIN,
+		[_SC_THREAD_KEYS_MAX] = 1024, // XXX EMSCRIPTEN replace PTHREAD_KEYS_MAX, // TODO(kleisauke): Why does this differ from PTHREAD_KEYS_MAX?
+		[_SC_THREAD_STACK_MIN] = 16384, // XXX EMSCRIPTEN replace PTHREAD_STACK_MIN, // TODO(kleisauke): Why does this differ from PTHREAD_STACK_MIN?
 		[_SC_THREAD_THREADS_MAX] = -1,
 		[_SC_THREAD_ATTR_STACKADDR] = VER,
 		[_SC_THREAD_ATTR_STACKSIZE] = VER,
@@ -105,7 +105,7 @@ long sysconf(int name)
 		[_SC_XOPEN_CRYPT] = 1, // XXX EMSCRIPTEN replace -1,
 		[_SC_XOPEN_ENH_I18N] = 1,
 		[_SC_XOPEN_SHM] = 1,
-		[_SC_2_CHAR_TERM] = 200809, // XXX EMSCRIPTEN replace -1,
+		[_SC_2_CHAR_TERM] = VER, // XXX EMSCRIPTEN replace -1,
 		[_SC_2_UPE] = -1,
 		[_SC_XOPEN_XPG2] = -1,
 		[_SC_XOPEN_XPG3] = -1,