Add thread-safety to libc, so that libc_r will build (on i386 at least).

All POSIX libc api now there (to P1003.1c/D10)
  (more md stuff is needed for other libc/arch/*)
  (setlogin is no longer a special syscall)
Add -pthread option to gcc (that makes it use -lc_r and -D_POSIX_THREADS).
Doc some re-entrant routines
Add libc_r to intro(3)
dig() uses some libc srcs and an extra -I was needed there.
Add more md stuff to libc_r.
Update includes for the pthreads api
Update libc_r TODO

1 files changed, 24 insertions, 2 deletions

diff --git a/lib/libc/net/getservbyname.c b/lib/libc/net/getservbyname.c
index 25f0e27d06a..7375c894042 100644
--- a/lib/libc/net/getservbyname.c
+++ b/lib/libc/net/getservbyname.c
@@ -32,21 +32,28 @@
  */
 
 #if defined(LIBC_SCCS) && !defined(lint)
-static char rcsid[] = "$OpenBSD: getservbyname.c,v 1.3 1997/07/09 01:08:34 millert Exp $";
+static char rcsid[] = "$OpenBSD: getservbyname.c,v 1.4 1998/11/20 11:18:44 d Exp $";
 #endif /* LIBC_SCCS and not lint */
 
 #include <netdb.h>
 #include <string.h>
+#include "thread_private.h"
 
 extern int _serv_stayopen;
 
+_THREAD_PRIVATE_MUTEX(getservbyname_r)
+
 struct servent *
-getservbyname(name, proto)
+getservbyname_r(name, proto, se, buf, buflen)
 	const char *name, *proto;
+	struct servent *se;
+	char *buf;
+	int buflen;
 {
 	register struct servent *p;
 	register char **cp;
 
+	_THREAD_PRIVATE_MUTEX_LOCK(getservbyname_r);
 	setservent(_serv_stayopen);
 	while ((p = getservent())) {
 		if (strcmp(name, p->s_name) == 0)
@@ -61,5 +68,20 @@ gotname:
 	}
 	if (!_serv_stayopen)
 		endservent();
+	_THREAD_PRIVATE_MUTEX_UNLOCK(getservbyname_r);
 	return (p);
 }
+
+struct servent *getservbyname(name, proto)
+	const char *name, *proto;
+{
+	_THREAD_PRIVATE_KEY(getservbyname)
+	static char buf[4096];
+	char *bufp = (char*)_THREAD_PRIVATE(getservbyname, buf, NULL);
+
+	if (bufp == NULL)
+		return (NULL);
+	return getservbyname_r(name, proto, (struct servent*) bufp, 
+		bufp + sizeof(struct servent), 
+		sizeof buf - sizeof(struct servent) );
+}