relibc: add missing float.h macros (LDBL_DIG, DECIMAL_DIG, FLT_EVAL_METHOD); add getprogname(); fix pthread unused assignment warning

src/header/float/cbindgen.toml

@@ -41,6 +41,9 @@ after_includes = """
 #define LDBL_HAS_SUBNORM 1
 #define LDBL_DECIMAL_DIG DECIMAL_DIG
 
+#define FLT_EVAL_METHOD 0
+#define DECIMAL_DIG 21
+
 // TODO: Support more architectures than x86_64 here:
 #define LDBL_TRUE_MIN 3.6451995318824746025e-4951L
 #define LDBL_MIN     3.3621031431120935063e-4932L
@@ -50,6 +53,9 @@ after_includes = """
 #define LDBL_MANT_DIG 64
 #define LDBL_MIN_EXP (-16381)
 #define LDBL_MAX_EXP 16384
+#define LDBL_DIG 18
+#define LDBL_MIN_10_EXP (-4931)
+#define LDBL_MAX_10_EXP 4932
 
 #endif // _RELIBC_BITS_FLOAT_H
 """

src/header/stdlib/mod.rs

@@ -57,6 +57,12 @@ pub const MB_CUR_MAX: c_int = 4;
 //Maximum number of bytes in a multibyte characters for any locale
 pub const MB_LEN_MAX: c_int = 4;
 
+/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/getprogname.html>.
+#[unsafe(no_mangle)]
+pub extern "C" fn getprogname() -> *const c_char {
+    unsafe { platform::program_invocation_short_name }
+}
+
 static ATEXIT_FUNCS: RawCell<[Option<extern "C" fn()>; 32]> = RawCell::new([None; 32]);
 static AT_QUICK_EXIT_FUNCS: RawCell<[Option<extern "C" fn()>; 32]> = RawCell::new([None; 32]);
 static L64A_BUFFER: RawCell<[c_char; 7]> = RawCell::new([0; 7]); // up to 6 digits plus null terminator

src/pthread/mod.rs

@@ -121,12 +121,11 @@ pub(crate) unsafe fn create(
 ) -> Result<pthread_t, Errno> {
     let attrs = attrs.cloned().unwrap_or_default();
 
-    let mut current_sigmask = 0_u64;
     #[cfg(target_os = "redox")]
-    {
-        current_sigmask =
-            redox_rt::signal::get_sigmask().expect("failed to obtain sigprocmask for caller");
-    }
+    let current_sigmask =
+        redox_rt::signal::get_sigmask().expect("failed to obtain sigprocmask for caller");
+    #[cfg(not(target_os = "redox"))]
+    let current_sigmask = 0_u64;
 
     // Create a locked mutex, unlocked by the thread after it has started.
     let synchronization_mutex = unsafe { Mutex::locked(current_sigmask) };