update from main archive 960828 glibc-1.93 cvs/libc-960829 cvs/libc-1-93

Thu Aug 29 00:28:08 1996  Ulrich Drepper  <drepper@cygnus.com>

	* stdio-common/printf_fp.c (__printf_fp): Use default value `.` if
 	`decimal' char is 0.

	* C-numeric.c (not_available): New constant.
	(_nl_C_LC_NUMERIC): Use `not_available' for grouping value.

	* nss/nsswitch.conf: Example configuration file.
	* nss/db-Makefile: Example Makefile for generation of databases
	for nss_db.
	* nss/Makefile (distribute): Add nsswitch.conf and db-Makefile.

1996-08-28  Paul Eggert  <eggert@twinsun.com>

	* C-messages.c (_nl_C_LC_MESSAGES): Set yesexpr to "^[yY]" and
 	noexpr to "^[nN]"; this conforms to POSIX.2.

	* C-time.c (_nl_C_LC_TIME): Change %d to %e in d_t_format, to
 	conform to POSIX.2.

1996-08-28  Paul Eggert  <eggert@twinsun.com>

	* C-monetary.c (not_available): New constant.
	(_nl_C_LC_MONETARY): Set mon_decimal_point to "", and set
 	mon_grouping, int_frac_digits, frac_digits, p_cs_precedes,
 	p_sep_by_space, n_cs_precedes, n_sep_by_space, p_sign_posn, and
 	n_sign_posn to CHAR_MAX, as required by the POSIX Standard.

Wed Aug 28 23:12:28 1996  Ulrich Drepper  <drepper@cygnus.com>

	* nss/nss_db/db-XXX.c: Correct function names.  They must be
	`_nss_db_*' instead of `_nss_files_*'.
	(lookup): `parse_line' returns 1 if succesful.
	* nss/nss_files/files-service.c (servbyname): Key for database
	must also contain protocol names.
	(servbypt): Likewise.
	Test must also check for protocol.  Add `proto' argument.

Tue Aug 27 09:56:13 1996  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* MakeTAGS ($P/subdirs.pot): Prefix all file names, not only the
	first one.

Fri Aug 16 16:11:25 1996  Thomas Bushnell, n/BSG  <thomas@gnu.ai.mit.edu>

	* nss/nss_dns/dns-host.c (_nss_dns_gethostbyname2_r): Treat
 	EPFNOSUPPORT and EAFNOSUPPORT as implying NSS_STATUS_UNAVAIL just
 	like ECONNREFUSED already does.
	(_nss_dns_gethostbyaddr_r): Likewise.
	* nss/nss_dns/dns-network.c (_nss_dns_getnetbyname_r): Likewise.
	(_nss_dns_getnetbyaddr_r): Likewise.

	* sysdeps/mach/hurd/socket.c (socket): For message transmission
 	and RPC errors that indicate that the socket server is not really
 	present and able to do its job, turn the error into EPFNOSUPPORT.

	* sysdeps/generic/sbrk.c (__sbrk):  Get kernel brk address
	always only if in static libc or if statically linked program
	uses libc.so.

2 files changed, 23 insertions, 20 deletions

diff --git a/sysdeps/generic/dl-sysdep.c b/sysdeps/generic/dl-sysdep.c
index 36349a5658..0dfb499d52 100644
--- a/sysdeps/generic/dl-sysdep.c
+++ b/sysdeps/generic/dl-sysdep.c
@@ -31,21 +31,26 @@ Cambridge, MA 02139, USA.  */
 extern int _dl_argc;
 extern char **_dl_argv;
 extern char **_environ;
+extern void _end;
 extern void _start (void);
 
 int __libc_enable_secure;
+int __libc_multiple_libcs;	/* Defining this here avoids the inclusion
+				   of init-first.  */
 
 ElfW(Addr)
 _dl_sysdep_start (void **start_argptr,
 		  void (*dl_main) (const ElfW(Phdr) *phdr, ElfW(Word) phnum,
 				   ElfW(Addr) *user_entry))
 {
-  const ElfW(Phdr) *phdr;
-  ElfW(Word) phnum;
+  const ElfW(Phdr) *phdr = NULL;
+  ElfW(Word) phnum = 0;
   ElfW(Addr) user_entry;
   ElfW(auxv_t) *av;
-  uid_t uid, euid;
-  gid_t gid, egid;
+  uid_t uid = 0;
+  uid_t euid = 0;
+  gid_t gid = 0;
+  gid_t egid = 0;
   unsigned int seen;
 
   user_entry = (ElfW(Addr)) &_start;
@@ -103,6 +108,18 @@ _dl_sysdep_start (void **start_argptr,
   DL_SYSDEP_INIT;
 #endif
 
+  if (__sbrk (0) == &_end)
+    {
+      /* The dynamic linker was run as a program, and so the initial break
+	 starts just after our bss, at &_end.  The malloc in dl-minimal.c
+	 will consume the rest of this page, so tell the kernel to move the
+	 break up that far.  When the user program examines its break, it
+	 will see this new value and not clobber our data.  */
+      size_t pg = __getpagesize ();
+
+      __sbrk (pg - ((&_end - (void *) 0) & (pg - 1)));
+    }
+
   (*dl_main) (phdr, phnum, &user_entry);
   return user_entry;
 }
diff --git a/sysdeps/generic/sbrk.c b/sysdeps/generic/sbrk.c
index d3ea705294..afed5902dc 100644
--- a/sysdeps/generic/sbrk.c
+++ b/sysdeps/generic/sbrk.c
@@ -38,22 +38,8 @@ __sbrk (ptrdiff_t increment)
      instances of __brk and __sbrk can share the heap, returning
      interleaved pieces of it.  */
   if (__curbrk == NULL || __libc_multiple_libcs)
-    {
-      extern void _end;
-
-      if (__brk (0) < 0)		/* Initialize the break.  */
-	return (void *) -1;
-
-      /* Align break address to page boundary if not happened before.  */
-      if (!__libc_multiple_libcs && __curbrk == &_end)
-	{
-	  size_t pg = __getpagesize ();
-	  ptrdiff_t rest = pg - ((&_end - (void *) 0) & (pg - 1));
-
-	  if (__brk (__curbrk + rest) < 0)
-	    return (void *) -1;
-	}
-    }
+    if (__brk (0) < 0)		/* Initialize the break.  */
+      return (void *) -1;
 
   if (increment == 0)
     return __curbrk;