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, 9 insertions, 7 deletions

diff --git a/lib/libc/rpc/clnt_unix.c b/lib/libc/rpc/clnt_unix.c
index 3b28bf8..d55859c 100644
--- a/lib/libc/rpc/clnt_unix.c
+++ b/lib/libc/rpc/clnt_unix.c
@@ -52,6 +52,7 @@ static char *rcsid = "$FreeBSD$";
  * Now go hang yourself.
  */
 
+#include "namespace.h"
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
@@ -63,6 +64,7 @@ static char *rcsid = "$FreeBSD$";
 #include <netdb.h>
 #include <errno.h>
 #include <rpc/pmap_clnt.h>
+#include "un-namespace.h"
 
 #define MCALL_MSG_SIZE 24
 
@@ -149,12 +151,12 @@ clntunix_create(raddr, prog, vers, sockp, sendsz, recvsz)
 	 * If no socket given, open one
 	 */
 	if (*sockp < 0) {
-		*sockp = socket(AF_UNIX, SOCK_STREAM, 0);
+		*sockp = _socket(AF_UNIX, SOCK_STREAM, 0);
 		len = strlen(raddr->sun_path) + sizeof(raddr->sun_family) +
 			sizeof(raddr->sun_len) + 1;
 		raddr->sun_len = len;
 		if ((*sockp < 0)
-		    || (connect(*sockp, (struct sockaddr *)raddr, len) < 0)) {
+		    || (_connect(*sockp, (struct sockaddr *)raddr, len) < 0)) {
 			rpc_createerr.cf_stat = RPC_SYSTEMERROR;
 			rpc_createerr.cf_error.re_errno = errno;
 			if (*sockp != -1)
@@ -441,7 +443,7 @@ clntunix_control(cl, request, info)
 		break;
 	case CLGET_LOCAL_ADDR:
 		len = sizeof(struct sockaddr);
-		if (getsockname(ct->ct_sock, (struct sockaddr *)info, &len) <0)
+		if (_getsockname(ct->ct_sock, (struct sockaddr *)info, &len) <0)
 			return(FALSE);
 		break;
 	case CLGET_RETRY_TIMEOUT:
@@ -473,7 +475,7 @@ clntunix_destroy(h)
 }
 
 /*
- * read() and write() are replaced with recvmsg()/sendmsg() so that
+ * _read() and _write() are replaced with _recvmsg()/_sendmsg() so that
  * we can pass ancillary control data. In this case, the data constists
  * of credential information which the kernel will fill in for us.
  * XXX: This code is specific to FreeBSD and will not work on other
@@ -505,7 +507,7 @@ 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)
@@ -533,7 +535,7 @@ 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));
 }
 
 /*
@@ -571,7 +573,7 @@ readunix(ct, buf, len)
 		/* XXX we know the other bits are still clear */
 		FD_SET(ct->ct_sock, fds);
 		tv = delta;	/* in case select writes back */
-		r = select(ct->ct_sock+1, fds, NULL, NULL, &tv);
+		r = _select(ct->ct_sock+1, fds, NULL, NULL, &tv);
 		save_errno = errno;
 
 		gettimeofday(&after, NULL);