Add a "fork" of musl as //fusl.

fusl/src/thread/pthread_attr_get.c

+#include "pthread_impl.h"
+
+int pthread_attr_getdetachstate(const pthread_attr_t *a, int *state)
+{
+        *state = a->_a_detach;
+        return 0;
+}
+int pthread_attr_getguardsize(const pthread_attr_t *restrict a, size_t *restrict size)
+{
+        *size = a->_a_guardsize + DEFAULT_GUARD_SIZE;
+        return 0;
+}
+
+int pthread_attr_getinheritsched(const pthread_attr_t *restrict a, int *restrict inherit)
+{
+        *inherit = a->_a_sched;
+        return 0;
+}
+
+int pthread_attr_getschedparam(const pthread_attr_t *restrict a, struct sched_param *restrict param)
+{
+        param->sched_priority = a->_a_prio;
+        return 0;
+}
+
+int pthread_attr_getschedpolicy(const pthread_attr_t *restrict a, int *restrict policy)
+{
+        *policy = a->_a_policy;
+        return 0;
+}
+
+int pthread_attr_getscope(const pthread_attr_t *restrict a, int *restrict scope)
+{
+        *scope = PTHREAD_SCOPE_SYSTEM;
+        return 0;
+}
+
+int pthread_attr_getstack(const pthread_attr_t *restrict a, void **restrict addr, size_t *restrict size)
+{
+        if (!a->_a_stackaddr)
+                return EINVAL;
+        *size = a->_a_stacksize + DEFAULT_STACK_SIZE;
+        *addr = (void *)(a->_a_stackaddr - *size);
+        return 0;
+}
+
+int pthread_attr_getstacksize(const pthread_attr_t *restrict a, size_t *restrict size)
+{
+        *size = a->_a_stacksize + DEFAULT_STACK_SIZE;
+        return 0;
+}
+
+int pthread_barrierattr_getpshared(const pthread_barrierattr_t *restrict a, int *restrict pshared)
+{
+        *pshared = !!a->__attr;
+        return 0;
+}
+
+int pthread_condattr_getclock(const pthread_condattr_t *restrict a, clockid_t *restrict clk)
+{
+        *clk = a->__attr & 0x7fffffff;
+        return 0;
+}
+
+int pthread_condattr_getpshared(const pthread_condattr_t *restrict a, int *restrict pshared)
+{
+        *pshared = a->__attr>>31;
+        return 0;
+}
+
+int pthread_mutexattr_getprotocol(const pthread_mutexattr_t *restrict a, int *restrict protocol)
+{
+        *protocol = PTHREAD_PRIO_NONE;
+        return 0;
+}
+int pthread_mutexattr_getpshared(const pthread_mutexattr_t *restrict a, int *restrict pshared)
+{
+        *pshared = a->__attr / 128U % 2;
+        return 0;
+}
+
+int pthread_mutexattr_getrobust(const pthread_mutexattr_t *restrict a, int *restrict robust)
+{
+        *robust = a->__attr / 4U % 2;
+        return 0;
+}
+
+int pthread_mutexattr_gettype(const pthread_mutexattr_t *restrict a, int *restrict type)
+{
+        *type = a->__attr & 3;
+        return 0;
+}
+
+int pthread_rwlockattr_getpshared(const pthread_rwlockattr_t *restrict a, int *restrict pshared)
+{
+        *pshared = a->__attr[0];
+        return 0;
+}