Update.

2004-08-04  Jakub Jelinek  <jakub@redhat.com>

	* hesiod/hesiod.c (__hesiod_res_get): Use calloc instead of malloc +
	memset.
	(__hesiod_res_set): Free nsaddrs.

	* include/resolv.h (__res_maybe_init): Add prototype.
	* resolv/resolv.h (struct __res_state): Add _u._ext.initstamp field.
	* resolv/Versions (libc): Add __res_maybe_init@@GLIBC_PRIVATE.
	* resolv/res_libc.c (__res_initstamp, lock): New variables.
	(res_init): Increase __res_initstamp.
	(__res_maybe_init): New function.
	* resolv/res_init.c (__res_vinit): Initialize _u._ext.initstamp.
	* hesiod/hesiod.c (__hesiod_res_get): Use __res_maybe_init instead
	of RES_INIT check and {res_ninit,__res_ninit,res_init} call.
	* sysdeps/posix/getaddrinfo.c (gaih_inet): Likewise.
	* resolv/nss_dns/dns-host.c (_nss_dns_gethostbyname2_r,
	_nss_dns_gethostbyaddr_r): Likewise.
	* resolv/nss_dns/dns-network.c (_nss_dns_getnetbyname_r,
	_nss_dns_getnetbyaddr_r): Likewise.
	* resolv/gethnamaddr.c (gethostbyname, gethostbyname2,
	gethostbyaddr): Likewise.
	* resolv/res_data.c (fp_nquery, res_mkquery, res_mkupdate,
	res_isourserver, res_sendsigned, res_update, res_search,
	res_querydomain): Likewise.
	* nss/getXXbyYY_r.c (INTERNAL (REENTRANT_NAME)): Likewise.
	* nss/digits_dots.c (__nss_hostname_digits_dots): Likewise.
	* nss/getnssent_r.c (__nss_setent, __nss_endent, __nss_getent_r):
	Likewise.

	* sysdeps/posix/getaddrinfo.c (gaih_inet): Set ai_family for
	V4-mapped IPv6 addresses and req->ai_family==AF_INET.
	Reported by A. Guru <a.guru@sympatico.ca>.

	* po/pl.po: Likewise.
	characters than necessary.

8 files changed, 83 insertions, 18 deletions

diff --git a/resolv/Versions b/resolv/Versions
index 1a24d30..a809508 100644
--- a/resolv/Versions
+++ b/resolv/Versions
@@ -38,6 +38,8 @@ libc {
     # This version is for the TLS symbol, GLIBC_2.0 is the old object symbol.
     h_errno; __resp;
 %endif
+
+    __res_maybe_init;
   }
 }
 
diff --git a/resolv/gethnamaddr.c b/resolv/gethnamaddr.c
index c93ca51..a02d0fb 100644
--- a/resolv/gethnamaddr.c
+++ b/resolv/gethnamaddr.c
@@ -493,10 +493,10 @@ gethostbyname(name)
 {
 	struct hostent *hp;
 
-	if ((_res.options & RES_INIT) == 0 && __res_ninit(&_res) == -1) {
+	if (__res_maybe_init (&_res, 0) == -1) {
 		__set_h_errno (NETDB_INTERNAL);
 		return (NULL);
-       }
+	}
 	if (_res.options & RES_USE_INET6) {
 		hp = gethostbyname2(name, AF_INET6);
 		if (hp)
@@ -522,7 +522,7 @@ gethostbyname2(name, af)
 	struct hostent *ret;
 	extern struct hostent *_gethtbyname2();
 
-	if ((_res.options & RES_INIT) == 0 && __res_ninit(&_res) == -1) {
+	if (__res_maybe_init (&_res, 0) == -1) {
 		__set_h_errno (NETDB_INTERNAL);
 		return (NULL);
 	}
@@ -665,7 +665,7 @@ gethostbyaddr(addr, len, af)
 #endif /*SUNSECURITY*/
 	extern struct hostent *_gethtbyaddr();
 
-	if ((_res.options & RES_INIT) == 0 && __res_ninit(&_res) == -1) {
+	if (__res_maybe_init (&_res, 0) == -1) {
 		__set_h_errno (NETDB_INTERNAL);
 		return (NULL);
 	}
diff --git a/resolv/nss_dns/dns-host.c b/resolv/nss_dns/dns-host.c
index 0424cb9..91699cc 100644
--- a/resolv/nss_dns/dns-host.c
+++ b/resolv/nss_dns/dns-host.c
@@ -145,7 +145,7 @@ _nss_dns_gethostbyname2_r (const char *name, int af, struct hostent *result,
   int olderr = errno;
   enum nss_status status;
 
-  if ((_res.options & RES_INIT) == 0 && __res_ninit (&_res) == -1)
+  if (__res_maybe_init (&_res, 0) == -1)
     return NSS_STATUS_UNAVAIL;
 
   switch (af) {
@@ -263,7 +263,7 @@ _nss_dns_gethostbyaddr_r (const void *addr, socklen_t len, int af,
   int n, status;
   int olderr = errno;
 
-  if ((_res.options & RES_INIT) == 0 && __res_ninit (&_res) == -1)
+  if (__res_maybe_init (&_res, 0) == -1)
     return NSS_STATUS_UNAVAIL;
 
   if (af == AF_INET6 && len == IN6ADDRSZ
diff --git a/resolv/nss_dns/dns-network.c b/resolv/nss_dns/dns-network.c
index efda486..a5d2c79 100644
--- a/resolv/nss_dns/dns-network.c
+++ b/resolv/nss_dns/dns-network.c
@@ -1,4 +1,5 @@
-/* Copyright (C) 1996, 1997, 1998, 1999, 2002 Free Software Foundation, Inc.
+/* Copyright (C) 1996, 1997, 1998, 1999, 2002, 2004
+   Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Extended from original form by Ulrich Drepper <drepper@cygnus.com>, 1996.
 
@@ -120,7 +121,7 @@ _nss_dns_getnetbyname_r (const char *name, struct netent *result,
   char *qbuf;
   enum nss_status status;
 
-  if ((_res.options & RES_INIT) == 0 && __res_ninit (&_res) == -1)
+  if (__res_maybe_init (&_res, 0) == -1)
     return NSS_STATUS_UNAVAIL;
 
   qbuf = strdupa (name);
@@ -171,7 +172,7 @@ _nss_dns_getnetbyaddr_r (uint32_t net, int type, struct netent *result,
   if (type != AF_INET)
     return NSS_STATUS_UNAVAIL;
 
-  if ((_res.options & RES_INIT) == 0 && __res_ninit (&_res) == -1)
+  if (__res_maybe_init (&_res, 0) == -1)
     return NSS_STATUS_UNAVAIL;
 
   net2 = (u_int32_t) net;
diff --git a/resolv/res_data.c b/resolv/res_data.c
index 7488ba7..2183e02 100644
--- a/resolv/res_data.c
+++ b/resolv/res_data.c
@@ -141,7 +141,7 @@ fp_query(const u_char *msg, FILE *file) {
 
 void
 fp_nquery(const u_char *msg, int len, FILE *file) {
-	if ((_res.options & RES_INIT) == 0 && __res_ninit(&_res) == -1)
+	if (__res_maybe_init (&_res, 0) == -1)
 		return;
 
 	res_pquery(&_res, msg, len, file);
@@ -157,7 +157,7 @@ res_mkquery(int op,			/* opcode of query */
 	    u_char *buf,		/* buffer to put query */
 	    int buflen)			/* size of buffer */
 {
-	if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
+	if (__res_maybe_init (&_res, 1) == -1) {
 		RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
 		return (-1);
 	}
@@ -169,7 +169,7 @@ res_mkquery(int op,			/* opcode of query */
 #ifdef BIND_UPDATE
 int
 res_mkupdate(ns_updrec *rrecp_in, u_char *buf, int buflen) {
-	if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
+	if (__res_maybe_init (&_res, 1) == -1) {
 		RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
 		return (-1);
 	}
@@ -184,7 +184,7 @@ res_query(const char *name,	/* domain name */
 	  u_char *answer,	/* buffer to put answer */
 	  int anslen)		/* size of answer buffer */
 {
-	if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
+	if (__res_maybe_init (&_res, 1) == -1) {
 		RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
 		return (-1);
 	}
@@ -208,7 +208,7 @@ res_isourserver(const struct sockaddr_in *inp) {
 
 int
 res_send(const u_char *buf, int buflen, u_char *ans, int anssiz) {
-	if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
+	if (__res_maybe_init (&_res, 1) == -1) {
 		/* errno should have been set by res_init() in this case. */
 		return (-1);
 	}
@@ -221,7 +221,7 @@ int
 res_sendsigned(const u_char *buf, int buflen, ns_tsig_key *key,
 	       u_char *ans, int anssiz)
 {
-	if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
+	if (__res_maybe_init (&_res, 1) == -1) {
 		/* errno should have been set by res_init() in this case. */
 		return (-1);
 	}
@@ -249,7 +249,7 @@ res_close(void) {
 #ifdef BIND_UPDATE
 int
 res_update(ns_updrec *rrecp_in) {
-	if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
+	if (__res_maybe_init (&_res, 1) == -1) {
 		RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
 		return (-1);
 	}
@@ -264,7 +264,7 @@ res_search(const char *name,	/* domain name */
 	   u_char *answer,	/* buffer to put answer */
 	   int anslen)		/* size of answer */
 {
-	if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
+	if (__res_maybe_init (&_res, 1) == -1) {
 		RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
 		return (-1);
 	}
@@ -279,7 +279,7 @@ res_querydomain(const char *name,
 		u_char *answer,		/* buffer to put answer */
 		int anslen)		/* size of answer */
 {
-	if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
+	if (__res_maybe_init (&_res, 1) == -1) {
 		RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
 		return (-1);
 	}
diff --git a/resolv/res_init.c b/resolv/res_init.c
index d0559c3..078480c 100644
--- a/resolv/res_init.c
+++ b/resolv/res_init.c
@@ -161,6 +161,10 @@ __res_vinit(res_state statp, int preinit) {
 #ifndef RFC1535
 	int dots;
 #endif
+#ifdef _LIBC
+	extern unsigned long long int __res_initstamp attribute_hidden;
+	statp->_u._ext.initstamp = __res_initstamp;
+#endif
 
 	if (!preinit) {
 		statp->retrans = RES_TIMEOUT;
diff --git a/resolv/res_libc.c b/resolv/res_libc.c
index 94bb2fd..b1047f0 100644
--- a/resolv/res_libc.c
+++ b/resolv/res_libc.c
@@ -15,16 +15,31 @@
  * SOFTWARE.
  */
 
+#include <limits.h>
 #include <sys/types.h>
 #include <netinet/in.h>
 #include <arpa/nameser.h>
 #include <resolv.h>
+#include <bits/libc-lock.h>
 
 
 /* The following bit is copied from res_data.c (where it is #ifdef'ed
    out) since res_init() should go into libc.so but the rest of that
    file should not.  */
 
+unsigned long long int __res_initstamp attribute_hidden;
+/* We have atomic increment operations on 64-bit platforms.  */
+#if __WORDSIZE == 64
+# define atomicinclock(lock) (void) 0
+# define atomicincunlock(lock) (void) 0
+# define atomicinc(var) atomic_increment (&(var))
+#else
+__libc_lock_define_initialized (static, lock);
+# define atomicinclock(lock) __libc_lock_lock (lock)
+# define atomicincunlock(lock) __libc_lock_unlock (lock)
+# define atomicinc(var) ++var
+#endif
+
 int
 res_init(void) {
 	extern int __res_vinit(res_state, int);
@@ -70,8 +85,45 @@ res_init(void) {
 	if (!_res.id)
 		_res.id = res_randomid();
 
+	atomicinclock (lock);
+	/* Request all threads to re-initialize their resolver states,
+	   resolv.conf might have changed.  */
+	atomicinc (__res_initstamp);
+	atomicincunlock (lock);
+
 	return (__res_vinit(&_res, 1));
 }
+
+/* Initialize resp if RES_INIT is not yet set or if res_init in some other
+   thread requested re-initializing.  */
+int
+__res_maybe_init (res_state resp, int preinit)
+{
+	if (resp->options & RES_INIT) {
+		if (__res_initstamp != resp->_u._ext.initstamp) {
+			if (resp->nscount > 0) {
+				__res_nclose (resp);
+				for (int ns = 0; ns < MAXNS; ns++) {
+					free (resp->_u._ext.nsaddrs[ns]);
+					resp->_u._ext.nsaddrs[ns] = NULL;
+				}
+				return __res_vinit (resp, 1);
+			}
+		}
+		return 0;
+	} else if (preinit) {
+		if (!resp->retrans)
+			resp->retrans = RES_TIMEOUT;
+		if (!resp->retry)
+			resp->retry = 4;
+		resp->options = RES_DEFAULT;
+		if (!resp->id)
+			resp->id = res_randomid ();
+		return __res_vinit (resp, 1);
+	} else
+		return __res_ninit (resp);
+}
+libc_hidden_def (__res_maybe_init)
 
 /* This needs to be after the use of _res in res_init, above.  */
 #undef _res
diff --git a/resolv/resolv.h b/resolv/resolv.h
index 010d7dd..00eabe8 100644
--- a/resolv/resolv.h
+++ b/resolv/resolv.h
@@ -134,6 +134,12 @@ struct __res_state {
 			u_int16_t		nscount6;
 			u_int16_t		nsinit;
 			struct sockaddr_in6	*nsaddrs[MAXNS];
+#ifdef _LIBC
+			unsigned long long int	initstamp
+			  __attribute__((packed));
+#else
+			unsigned int		_initstamp[2];
+#endif
 		} _ext;
 	} _u;
 };