From be7dc2b77e368daad6f81e272fc41f1b86166240 Mon Sep 17 00:00:00 2001
From: Joseph Myers <joseph@codesourcery.com>
Date: Wed, 17 Jun 2015 20:10:50 +0000
Subject: [PATCH] Fix syslog dprintf namespace (bug 18534).

syslog functions bring in references to dprintf, which wasn't added to
POSIX until the 2008 edition and so isn't in various standards
containing the syslog functions.  This patch fixes this by making
dprintf into a weak alias of __dprintf and using __dprintf as
appropriate.

Tested for x86_64 and x86 (testsuite, and that installed stripped
shared libraries are unchanged by the patch).

	[BZ #18534]
	* stdio-common/dprintf.c (__dprintf): Use libc_hidden_def.
	(dprintf): Define as a weak alias of __dprintf, not a strong
	alias.
	* include/stdio.h (__dprintf): Declare.  Use libc_hidden_proto.
	* misc/syslog.c (__vsyslog_chk): Call __dprintf instead of
	dprintf.
	* conform/Makefile (test-xfail-XPG4/syslog.h/linknamespace):
	Remove variable.
	(test-xfail-UNIX98/syslog.h/linknamespace): Likewise.
	(test-xfail-XOPEN2K/syslog.h/linknamespace): Likewise.
---
 ChangeLog              | 12 ++++++++++++
 NEWS                   |  2 +-
 conform/Makefile       |  3 ---
 include/stdio.h        |  3 +++
 misc/syslog.c          |  2 +-
 stdio-common/dprintf.c |  3 ++-
 6 files changed, 19 insertions(+), 6 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 3d03d20f7c..abc52cc07b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,17 @@
 2015-06-17  Joseph Myers  <joseph@codesourcery.com>
 
+	[BZ #18534]
+	* stdio-common/dprintf.c (__dprintf): Use libc_hidden_def.
+	(dprintf): Define as a weak alias of __dprintf, not a strong
+	alias.
+	* include/stdio.h (__dprintf): Declare.  Use libc_hidden_proto.
+	* misc/syslog.c (__vsyslog_chk): Call __dprintf instead of
+	dprintf.
+	* conform/Makefile (test-xfail-XPG4/syslog.h/linknamespace):
+	Remove variable.
+	(test-xfail-UNIX98/syslog.h/linknamespace): Likewise.
+	(test-xfail-XOPEN2K/syslog.h/linknamespace): Likewise.
+
 	[BZ #18533]
 	* misc/syslog.c (vsyslog): Define as a weak alias of __vsyslog,
 	not a strong alias.
diff --git a/NEWS b/NEWS
index ad388adbc3..a0ebe58989 100644
--- a/NEWS
+++ b/NEWS
@@ -22,7 +22,7 @@ Version 2.22
   18324, 18333, 18346, 18397, 18409, 18410, 18412, 18418, 18422, 18434,
   18444, 18468, 18469, 18470, 18479, 18483, 18495, 18496, 18497, 18498,
   18507, 18512, 18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532,
-  18533.
+  18533, 18534.
 
 * Cache information can be queried via sysconf() function on s390 e.g. with
   _SC_LEVEL1_ICACHE_SIZE as argument.
diff --git a/conform/Makefile b/conform/Makefile
index 567046fd16..9347b0f6a8 100644
--- a/conform/Makefile
+++ b/conform/Makefile
@@ -346,16 +346,13 @@ test-xfail-XOPEN2K8/ndbm.h/linknamespace = yes
 # Unsorted expected failures.
 test-xfail-XPG3/unistd.h/linknamespace = yes
 test-xfail-XPG4/fmtmsg.h/linknamespace = yes
-test-xfail-XPG4/syslog.h/linknamespace = yes
 test-xfail-XPG4/unistd.h/linknamespace = yes
 test-xfail-POSIX/mqueue.h/linknamespace = yes
 test-xfail-POSIX/semaphore.h/linknamespace = yes
 test-xfail-UNIX98/fmtmsg.h/linknamespace = yes
 test-xfail-UNIX98/mqueue.h/linknamespace = yes
-test-xfail-UNIX98/syslog.h/linknamespace = yes
 test-xfail-UNIX98/unistd.h/linknamespace = yes
 test-xfail-UNIX98/wchar.h/linknamespace = yes
 test-xfail-XOPEN2K/fmtmsg.h/linknamespace = yes
-test-xfail-XOPEN2K/syslog.h/linknamespace = yes
 test-xfail-POSIX2008/semaphore.h/linknamespace = yes
 test-xfail-XOPEN2K8/fmtmsg.h/linknamespace = yes
diff --git a/include/stdio.h b/include/stdio.h
index 6ae70a35f4..9cd324bfe0 100644
--- a/include/stdio.h
+++ b/include/stdio.h
@@ -135,6 +135,9 @@ extern int _IO_new_fgetpos (_IO_FILE *, _IO_fpos_t *);
 #  endif
 
 libc_hidden_proto (dprintf)
+extern __typeof (dprintf) __dprintf
+     __attribute__ ((__format__ (__printf__, 2, 3)));
+libc_hidden_proto (__dprintf)
 libc_hidden_proto (fprintf)
 libc_hidden_proto (vfprintf)
 libc_hidden_proto (sprintf)
diff --git a/misc/syslog.c b/misc/syslog.c
index 35cae6c077..9dd4cde18c 100644
--- a/misc/syslog.c
+++ b/misc/syslog.c
@@ -298,7 +298,7 @@ __vsyslog_chk(int pri, int flag, const char *fmt, va_list ap)
 		if (LogStat & LOG_CONS &&
 		    (fd = __open(_PATH_CONSOLE, O_WRONLY|O_NOCTTY, 0)) >= 0)
 		  {
-		    dprintf (fd, "%s\r\n", buf + msgoff);
+		    __dprintf (fd, "%s\r\n", buf + msgoff);
 		    (void)__close(fd);
 		  }
 	      }
diff --git a/stdio-common/dprintf.c b/stdio-common/dprintf.c
index 3221cf0122..5a7011dc52 100644
--- a/stdio-common/dprintf.c
+++ b/stdio-common/dprintf.c
@@ -35,5 +35,6 @@ __dprintf (int d, const char *format, ...)
 
   return done;
 }
+libc_hidden_def (__dprintf)
 ldbl_hidden_def (__dprintf, dprintf)
-ldbl_strong_alias (__dprintf, dprintf)
+ldbl_weak_alias (__dprintf, dprintf)