libc: silence noncritical dummy implementations

* isatty

  For the moment it is not possible to determine if the fd belongs to a
  tty. For whatever reasons, the check is done multiple times, e.g.
  'tclsh', which will spam the LOG.

* sysctl(HW_FLOATINGPT)

  FPU is enabled on all our platforms, so return true.

Fixes #3389.

repos/libports/run/ieee754.run

@@ -79,8 +79,6 @@ while {true} {
 }
 
 set reference_output_arm {
-Warning: missing sysctl for [6][10]
-Warning: isatty: isatty not implemented
 FLT_RADIX = 2
 FLT_MANT_DIG = 24
 DBL_MANT_DIG = 53
@@ -772,7 +770,6 @@ pow(-2, -2) = 0.25
 }
 
 set reference_output_x86_64 {
-Warning: isatty: isatty not implemented
 FLT_RADIX = 2
 FLT_MANT_DIG = 24
 DBL_MANT_DIG = 53
@@ -1464,7 +1461,6 @@ pow(-2, -2) = 0.25
 }
 
 set reference_output_x86_32 {
-Warning: isatty: isatty not implemented
 FLT_RADIX = 2
 FLT_MANT_DIG = 24
 DBL_MANT_DIG = 53

repos/libports/src/lib/libc/dummies.cc

@@ -55,6 +55,7 @@ ret_type name args \
 	return ret_val; \
 }
 
+
 #define __SYS_DUMMY(ret_type, ret_val, name, args)\
 	extern "C" __attribute__((weak)) \
 	ret_type __sys_##name args \
@@ -74,6 +75,23 @@ ret_type name args \
 	ret_type         name args __attribute__((weak, alias("__sys_" #name))); \
 
 
+#define __SYS_DUMMY_SILENT(ret_type, ret_val, name, args)\
+	extern "C" __attribute__((weak)) \
+	ret_type __sys_##name args \
+	{ \
+		errno = ENOSYS;						\
+		return ret_val; \
+	} \
+	extern "C" __attribute__((weak)) \
+	ret_type __libc_##name args \
+	{ \
+		errno = ENOSYS;						\
+		return ret_val; \
+	} \
+	ret_type      _##name args __attribute__((weak, alias("__sys_" #name))); \
+	ret_type         name args __attribute__((weak, alias("__sys_" #name))); \
+
+
 DUMMY(int   , -1, chroot, (const char *))
 DUMMY(char *,  0, crypt, (const char *, const char *))
 DUMMY(DB *  ,  0, dbopen, (const char *, int, int, DBTYPE, const void *))
@@ -100,7 +118,7 @@ DUMMY(pid_t , -1, getpgrp, (void))
 DUMMY(int   , -1, getpriority, (int, int))
 DUMMY(int   , -1, getrusage, (int, rusage *))
 DUMMY(uid_t ,  0, getuid, (void))
-DUMMY(int   ,  1, isatty, (int))
+DUMMY_SILENT(int   ,  1, isatty, (int))
 DUMMY(int   , -1, kill, (pid_t, int))
 DUMMY(int   , -1, link, (const char *, const char *))
 DUMMY(int   ,  0, minherit, (void *, size_t, int))
@@ -117,7 +135,7 @@ DUMMY(int   , -1, sched_setparam, (pid_t, const sched_param *))
 DUMMY(int   , -1, sched_setscheduler, (pid_t, int, const sched_param *))
 DUMMY(int   , -1, sched_yield, (void))
 DUMMY(int   , -1, __semctl, (void))
-DUMMY(sig_t, SIG_ERR, signal, (int, sig_t));
+DUMMY_SILENT(sig_t, SIG_ERR, signal, (int, sig_t));
 DUMMY(int   , -1, setegid, (uid_t))
 DUMMY(int   , -1, seteuid, (uid_t))
 DUMMY(int   , -1, setgid, (gid_t))
@@ -181,7 +199,7 @@ __SYS_DUMMY(int, -1, truncate, (const char *, off_t))
 DUMMY(int, -1, sigblock, (int))
 DUMMY(int, -1, thr_kill2, (pid_t pid, long id, int sig));
 
-__SYS_DUMMY(int, -1, sigaction, (int, const struct sigaction *, struct sigaction *));
+__SYS_DUMMY_SILENT(int, -1, sigaction, (int, const struct sigaction *, struct sigaction *));
 __SYS_DUMMY(int, -1, sigsuspend, (const sigset_t *))
 __SYS_DUMMY(int, -1, sigtimedwait, (const sigset_t *, siginfo_t *, const struct timespec *));
 __SYS_DUMMY(int, -1, sigwaitinfo, (const sigset_t *, siginfo_t *));

repos/libports/src/lib/libc/sysctl.cc

@@ -100,6 +100,14 @@ extern "C" int __sysctl(const int *name, u_int namelen,
 				*(int*)oldp = (int)PAGESIZE;
 				*oldlenp = sizeof(int);
 				return 0;
+			/*
+			 * Used on ARM platforms to check HW fp support. Since the
+			 * FP is enabled on all our ARM platforms we return true.
+			 */
+			case HW_FLOATINGPT:
+				*(int*)oldp = 1;
+				*oldlenp = sizeof(int);
+				return 0;
 
 			} break;