From 9af2b4271232977fe523e77ee8fd7b200a23e98f Mon Sep 17 00:00:00 2001
From: ume <ume@FreeBSD.org>
Date: Tue, 19 Apr 2005 14:41:13 +0000
Subject: - add getproto{byname,bynumber,ent}_r for internal use within libc. -
 make getproto{byname,bynumber,ent} thread-safe.

---
 lib/libc/net/getprotoent.c | 141 +++++++++++++++++++++++++++++++++++----------
 1 file changed, 112 insertions(+), 29 deletions(-)

(limited to 'lib/libc/net/getprotoent.c')

diff --git a/lib/libc/net/getprotoent.c b/lib/libc/net/getprotoent.c
index e2d7a97..037547b 100644
--- a/lib/libc/net/getprotoent.c
+++ b/lib/libc/net/getprotoent.c
@@ -43,53 +43,101 @@ __FBSDID("$FreeBSD$");
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include "namespace.h"
+#include "reentrant.h"
+#include "un-namespace.h"
+#include "netdb_private.h"
 
-#define	MAXALIASES	35
+static struct protodata protodata;
+static thread_key_t protodata_key;
+static once_t protodata_init_once = ONCE_INITIALIZER;
+static int protodata_thr_keycreated = 0;
 
-static FILE *protof = NULL;
-static char line[BUFSIZ+1];
-static struct protoent proto;
-static char *proto_aliases[MAXALIASES];
-int _proto_stayopen;
+static void
+protoent_data_clear(struct protoent_data *ped)
+{
+	if (ped->fp) {
+		fclose(ped->fp);
+		ped->fp = NULL;
+	}
+}
+
+static void
+protodata_free(void *ptr)
+{
+	struct protodata *pd = ptr;
+
+	if (pd == NULL)
+		return;
+	protoent_data_clear(&pd->data);
+	free(pd);
+}
+
+static void
+protodata_keycreate(void)
+{
+	protodata_thr_keycreated =
+	    (thr_keycreate(&protodata_key, protodata_free) == 0);
+}
+
+struct protodata *
+__protodata_init(void)
+{
+	struct protodata *pd;
+
+	if (thr_main() != 0)
+		return (&protodata);
+	if (thr_once(&protodata_init_once, protodata_keycreate) != 0 ||
+	    !protodata_thr_keycreated)
+		return (NULL);
+	if ((pd = thr_getspecific(protodata_key)) != NULL)
+		return (pd);
+	if ((pd = calloc(1, sizeof(*pd))) == NULL)
+		return (NULL);
+	if (thr_setspecific(protodata_key, pd) == 0)
+		return (pd);
+	free(pd);
+	return (NULL);
+}
 
 void
-setprotoent(f)
-	int f;
+setprotoent_r(int f, struct protoent_data *ped)
 {
-	if (protof == NULL)
-		protof = fopen(_PATH_PROTOCOLS, "r" );
+	if (ped->fp == NULL)
+		ped->fp = fopen(_PATH_PROTOCOLS, "r");
 	else
-		rewind(protof);
-	_proto_stayopen |= f;
+		rewind(ped->fp);
+	ped->stayopen |= f;
 }
 
 void
-endprotoent()
+endprotoent_r(struct protoent_data *ped)
 {
-	if (protof) {
-		fclose(protof);
-		protof = NULL;
+	if (ped->fp) {
+		fclose(ped->fp);
+		ped->fp = NULL;
 	}
-	_proto_stayopen = 0;
+	ped->stayopen = 0;
 }
 
-struct protoent *
-getprotoent()
+int
+getprotoent_r(struct protoent *pe, struct protoent_data *ped)
 {
 	char *p;
-	char *cp, **q;
+	char *cp, **q, *endp;
+	long l;
 
-	if (protof == NULL && (protof = fopen(_PATH_PROTOCOLS, "r" )) == NULL)
-		return (NULL);
+	if (ped->fp == NULL && (ped->fp = fopen(_PATH_PROTOCOLS, "r")) == NULL)
+		return (-1);
 again:
-	if ((p = fgets(line, BUFSIZ, protof)) == NULL)
-		return (NULL);
+	if ((p = fgets(ped->line, BUFSIZ, ped->fp)) == NULL)
+		return (-1);
 	if (*p == '#')
 		goto again;
 	cp = strpbrk(p, "#\n");
 	if (cp != NULL)
 		*cp = '\0';
-	proto.p_name = p;
+	pe->p_name = p;
 	cp = strpbrk(p, " \t");
 	if (cp == NULL)
 		goto again;
@@ -99,8 +147,11 @@ again:
 	p = strpbrk(cp, " \t");
 	if (p != NULL)
 		*p++ = '\0';
-	proto.p_proto = atoi(cp);
-	q = proto.p_aliases = proto_aliases;
+	l = strtol(cp, &endp, 10);
+	if (endp == cp || *endp != '\0' || l < 0 || l > USHRT_MAX)
+		goto again;
+	pe->p_proto = l;
+	q = pe->p_aliases = ped->aliases;
 	if (p != NULL) {
 		cp = p;
 		while (cp && *cp) {
@@ -108,7 +159,7 @@ again:
 				cp++;
 				continue;
 			}
-			if (q < &proto_aliases[MAXALIASES - 1])
+			if (q < &ped->aliases[PROTOENT_MAXALIASES - 1])
 				*q++ = cp;
 			cp = strpbrk(cp, " \t");
 			if (cp != NULL)
@@ -116,5 +167,37 @@ again:
 		}
 	}
 	*q = NULL;
-	return (&proto);
+	return (0);
+}
+
+void
+setprotoent(int f)
+{
+	struct protodata *pd;
+
+	if ((pd = __protodata_init()) == NULL)
+		return;
+	setprotoent_r(f, &pd->data);
+}
+
+void
+endprotoent(void)
+{
+	struct protodata *pd;
+
+	if ((pd = __protodata_init()) == NULL)
+		return;
+	endprotoent_r(&pd->data);
+}
+
+struct protoent *
+getprotoent(void)
+{
+	struct protodata *pd;
+
+	if ((pd = __protodata_init()) == NULL)
+		return (NULL);
+	if (getprotoent_r(&pd->proto, &pd->data) != 0)
+		return (NULL);
+	return (&pd->proto);
 }
-- 
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