- adds several config-options to allow for turning off certain features

  like
  o UCLIBC_HAS_GNU_ERROR
  o UCLIBC_HAS_BSD_ERR
  o UCLIBC_HAS_PTY
  o UCLIBC_HAS_GETPT (1)
  o UCLIBC_SYSCALL_STUBS
  o UCLIBC_SYSCALL_STUB_WARNING
  o UCLIBC_LINUX_SPECIFIC (2)
  o UCLIBC_BSD_SPECIFIC (3)
  o UCLIBC_NTP_LEGACY (4)
  o UCLIBC_SV4_DEPRECATED (5)
  o UCLIBC_HAVE_REALTIME (6)
  o UCLIBC_HAVE_ADVANCED_REALTIME (7)
  o UCLIBC_HAVE_EPOLL (8)
  o UCLIBC_HAVE_XATTR (9)
  o UCLIBC_HAVE_PROFILING (10)

(1) make non-standard getpt optional and implement standard posix_openpt
(2) fstatfs(), inotify_*(), ioperm(), iopl(), madvise(), modify_ldt(),
    personality()
    ppoll(), setresuid()
(3) mincore(), getdomainname(), setdomainname()
(4) ntp_adjtime(), ntp_gettime() aliases
(5) ustat() [use statfs(2) in your code instead]
(6) All marked as "(REALTIME)" in SUSv3
(7) All marked as "(ADVANCED REALTIME)" in SUSv3
(8) epoll_create(), epoll_ctl(), epoll_wait()
(9) all Extended Attributes
(10) helpers for gcc's -finstrument-functions

- Fixes _dl_exit()
- Implements sleep(3) for !UCLIBC_HAVE_REALTIME
- Implements usleep(3) for !UCLIBC_HAVE_REALTIME
- adds #warning about incorrect posix_fadvise{,64}()
- removes unused and unwanted uselib()

Net outcome is that an allnoconfig with HAVE_SHARED is now about 88k instead 
of formerly 130k.

4 files changed, 39 insertions, 14 deletions

diff --git a/libc/stdlib/Makefile.in b/libc/stdlib/Makefile.in
index ad2a95935..dfef6d18e 100644
--- a/libc/stdlib/Makefile.in
+++ b/libc/stdlib/Makefile.in
@@ -12,10 +12,16 @@ include $(top_srcdir)libc/stdlib/malloc-standard/Makefile.in
 CSRC := \
 	abort.c getenv.c mkdtemp.c mktemp.c realpath.c mkstemp.c \
 	rand.c random.c random_r.c setenv.c system.c div.c ldiv.c lldiv.c \
-	getpt.c ptsname.c grantpt.c unlockpt.c drand48-iter.c jrand48.c \
+	getpt.c drand48-iter.c jrand48.c \
 	jrand48_r.c lrand48.c lrand48_r.c mrand48.c mrand48_r.c nrand48.c \
 	nrand48_r.c rand_r.c srand48.c srand48_r.c seed48.c seed48_r.c \
-	valloc.c posix_memalign.c a64l.c l64a.c __uc_malloc.c
+	valloc.c a64l.c l64a.c __uc_malloc.c
+ifeq ($(UCLIBC_HAS_ADVANCED_REALTIME),y)
+CSRC += posix_memalign.c
+endif
+ifeq ($(UCLIBC_HAS_PTY),y)
+CSRC += grantpt.c unlockpt.c ptsname.c
+endif
 ifeq ($(UCLIBC_HAS_ARC4RANDOM),y)
 CSRC += arc4random.c
 endif
diff --git a/libc/stdlib/_atexit.c b/libc/stdlib/_atexit.c
index 21aa30c81..e5840f471 100644
--- a/libc/stdlib/_atexit.c
+++ b/libc/stdlib/_atexit.c
@@ -107,6 +107,7 @@ extern void *__dso_handle __attribute__ ((__weak__));
 #ifdef L_atexit
 int attribute_hidden atexit(aefuncp func)
 #else
+int old_atexit(aefuncp func);
 int old_atexit(aefuncp func)
 #endif
 {
diff --git a/libc/stdlib/bsd_getpt.c b/libc/stdlib/bsd_getpt.c
index 9b93448bc..5f0f63f7a 100644
--- a/libc/stdlib/bsd_getpt.c
+++ b/libc/stdlib/bsd_getpt.c
@@ -22,6 +22,7 @@
 #include <string.h>
 #include <unistd.h>
 
+#if defined __USE_BSD
 libc_hidden_proto(open)
 /* Experimentally off - libc_hidden_proto(mempcpy) */
 
@@ -76,3 +77,4 @@ __getpt (void)
   __set_errno (ENOENT);
   return -1;
 }
+#endif
diff --git a/libc/stdlib/getpt.c b/libc/stdlib/getpt.c
index 3dbaf9ed7..950664509 100644
--- a/libc/stdlib/getpt.c
+++ b/libc/stdlib/getpt.c
@@ -20,8 +20,13 @@
 #include <errno.h>
 #include <fcntl.h>
 #include <stdlib.h>
+#include <stdbool.h>
 #include <unistd.h>
 #include <paths.h>
+#include <sys/statfs.h>
+
+extern __typeof(statfs) __libc_statfs;
+libc_hidden_proto(__libc_statfs)
 
 libc_hidden_proto(open)
 libc_hidden_proto(close)
@@ -47,36 +52,37 @@ extern int __bsd_getpt (void) attribute_hidden;
 
 /* Open a master pseudo terminal and return its file descriptor.  */
 int
-getpt (void)
+posix_openpt (int flags)
 {
+#define have_no_dev_ptmx (1<<0)
+#define devpts_mounted   (1<<1)
 #if !defined __UNIX98PTY_ONLY__
-  static smallint have_no_dev_ptmx;
+  static smallint _state;
 #endif
   int fd;
 
 #if !defined __UNIX98PTY_ONLY__
-  if (!have_no_dev_ptmx)
+  if (!(_state & have_no_dev_ptmx))
 #endif
     {
-      fd = open (_PATH_DEVPTMX, O_RDWR);
+      fd = open (_PATH_DEVPTMX, flags);
       if (fd != -1)
 	{
 #if defined __ASSUME_DEVPTS__
 	  return fd;
 #else
 	  struct statfs fsbuf;
-	  static smallint devpts_mounted;
 
 	  /* Check that the /dev/pts filesystem is mounted
 	     or if /dev is a devfs filesystem (this implies /dev/pts).  */
-	  if (devpts_mounted
-	      || (statfs (_PATH_DEVPTS, &fsbuf) == 0
+	  if ((_state & devpts_mounted)
+	      || (__libc_statfs (_PATH_DEVPTS, &fsbuf) == 0
 		  && fsbuf.f_type == DEVPTS_SUPER_MAGIC)
-	      || (statfs (_PATH_DEV, &fsbuf) == 0	
+	      || (__libc_statfs (_PATH_DEV, &fsbuf) == 0
 		  && fsbuf.f_type == DEVFS_SUPER_MAGIC))
 	    {
 	      /* Everything is ok.  */
-	      devpts_mounted = 1;
+	      _state |= devpts_mounted;
 	      return fd;
 	    }
 
@@ -84,7 +90,7 @@ getpt (void)
              are not usable.  */
 	  close (fd);
 #if !defined __UNIX98PTY_ONLY__
-	  have_no_dev_ptmx = 1;
+	  _state |= have_no_dev_ptmx;
 #endif
 #endif
 	}
@@ -92,16 +98,25 @@ getpt (void)
 	{
 #if !defined __UNIX98PTY_ONLY__
 	  if (errno == ENOENT || errno == ENODEV)
-	    have_no_dev_ptmx = 1;
+	    _state |= have_no_dev_ptmx;
 	  else
 #endif
 	    return -1;
 	}
     }
+  return -1;
+}
 
+#if defined __USE_GNU && defined __UCLIBC_HAS_GETPT__
+int
+getpt (void)
+{
+	int fd = posix_openpt(O_RDWR);
 #if !defined __UNIX98PTY_ONLY__
-  return __bsd_getpt ();
+	if (fd == -1)
+		fd = __bsd_getpt();
 #endif
+	return fd;
 }
 
 #if !defined __UNIX98PTY_ONLY__
@@ -111,3 +126,4 @@ getpt (void)
 # define __getpt __bsd_getpt
 # include "bsd_getpt.c"
 #endif
+#endif /* GNU && __UCLIBC_HAS_GETPT__ */