Remove _THREAD_SAFE and make libc thread-safe by default by

adding (weak definitions to) stubs for some of the pthread
functions.  If the threads library is linked in, the real
pthread functions will pulled in.

Use the following convention for system calls wrapped by the
threads library:
	__sys_foo - actual system call
	_foo - weak definition to __sys_foo
	foo - weak definition to __sys_foo

Change all libc uses of system calls wrapped by the threads
library from foo to _foo.  In order to define the prototypes
for _foo(), we introduce namespace.h and un-namespace.h
(suggested by bde).  All files that need to reference these
system calls, should include namespace.h before any standard
includes, then include un-namespace.h after the standard
includes and before any local includes.  <db.h> is an exception
and shouldn't be included in between namespace.h and
un-namespace.h  namespace.h will define foo to _foo, and
un-namespace.h will undefine foo.

Try to eliminate some of the recursive calls to MT-safe
functions in libc/stdio in preparation for adding a mutex
to FILE.  We have recursive mutexes, but would like to avoid
using them if possible.

Remove uneeded includes of <errno.h> from a few files.

Add $FreeBSD$ to a few files in order to pass commitprep.

Approved by:	-arch

1 files changed, 12 insertions, 10 deletions

diff --git a/lib/libc/rpc/svc_unix.c b/lib/libc/rpc/svc_unix.c
index dc680d0..ac92bc5 100644
--- a/lib/libc/rpc/svc_unix.c
+++ b/lib/libc/rpc/svc_unix.c
@@ -43,6 +43,7 @@ static char *rcsid = "$FreeBSD$";
  * and a record/unix stream.
  */
 
+#include "namespace.h"
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
@@ -52,6 +53,7 @@ static char *rcsid = "$FreeBSD$";
 #include <sys/un.h>
 #include <sys/uio.h>
 #include <errno.h>
+#include "un-namespace.h"
 
 /*
  * Ops vector for AF_UNIX based rpc service handle
@@ -130,7 +132,7 @@ static int __msgread(sock, buf, cnt)
 	msg.msg_controllen = sizeof(struct cmessage);
 	msg.msg_flags = 0;
 
-	return(recvmsg(sock, &msg, 0));
+	return(_recvmsg(sock, &msg, 0));
 }
 
 static int __msgwrite(sock, buf, cnt)
@@ -157,7 +159,7 @@ static int __msgwrite(sock, buf, cnt)
 	msg.msg_controllen = sizeof(struct cmessage);
 	msg.msg_flags = 0;
 
-	return(sendmsg(sock, &msg, 0));
+	return(_sendmsg(sock, &msg, 0));
 }
 
 /*
@@ -194,7 +196,7 @@ svcunix_create(sock, sendsize, recvsize, path)
 	int len = sizeof(struct sockaddr_un);
 
 	if (sock == RPC_ANYSOCK) {
-		if ((sock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
+		if ((sock = _socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
 			perror("svc_unix.c - AF_UNIX socket creation problem");
 			return ((SVCXPRT *)NULL);
 		}
@@ -207,10 +209,10 @@ svcunix_create(sock, sendsize, recvsize, path)
 		sizeof(addr.sun_len) + 1;
 	addr.sun_len = len;
 
-	bind(sock, (struct sockaddr *)&addr, len);
+	_bind(sock, (struct sockaddr *)&addr, len);
 
-	if ((getsockname(sock, (struct sockaddr *)&addr, &len) != 0)  ||
-	    (listen(sock, 2) != 0)) {
+	if ((_getsockname(sock, (struct sockaddr *)&addr, &len) != 0)  ||
+	    (_listen(sock, 2) != 0)) {
 		perror("svc_unix.c - cannot getsockname or listen");
 		if (madesock)
 		       (void)_close(sock);
@@ -301,7 +303,7 @@ rendezvous_request(xprt)
 	r = (struct unix_rendezvous *)xprt->xp_p1;
     again:
 	len = sizeof(struct sockaddr_in);
-	if ((sock = accept(xprt->xp_sock, (struct sockaddr *)&addr,
+	if ((sock = _accept(xprt->xp_sock, (struct sockaddr *)&addr,
 	    &len)) < 0) {
 		if (errno == EINTR)
 			goto again;
@@ -359,7 +361,7 @@ static struct timeval wait_per_try = { 35, 0 };
  * Note: we have to be careful here not to allow ourselves to become
  * blocked too long in this routine. While we're waiting for data from one
  * client, another client may be trying to connect. To avoid this situation,
- * some code from svc_run() is transplanted here: the select() loop checks
+ * some code from svc_run() is transplanted here: the _select() loop checks
  * all RPC descriptors including the one we want and calls svc_getreqset2()
  * to handle new requests if any are detected.
  */
@@ -391,8 +393,8 @@ readunix(xprt, buf, len)
 
 		/* XXX we know the other bits are still clear */
 		FD_SET(sock, fds);
-		tv = delta;	/* in case select() implements writeback */
-		switch (select(svc_maxfd + 1, fds, NULL, NULL, &tv)) {
+		tv = delta;	/* in case _select() implements writeback */
+		switch (_select(svc_maxfd + 1, fds, NULL, NULL, &tv)) {
 		case -1:
 			if (errno != EINTR)
 				goto fatal_err;