Libc-997.1.1.tar.gz

[apple/libc.git] / stdio / FreeBSD / tmpnam.c

diff --git a/stdio/FreeBSD/tmpnam.c b/stdio/FreeBSD/tmpnam.c
index f3ab680805e4e97405a895f8cce2dc28e964bb8c..6dad888a2941790f3f34e6d8d9bbd1840234a77d 100644 (file)
--- a/stdio/FreeBSD/tmpnam.c
+++ b/stdio/FreeBSD/tmpnam.c
@@ -40,21 +40,35 @@ __FBSDID("$FreeBSD: src/lib/libc/stdio/tmpnam.c,v 1.6 2007/01/09 00:28:07 imp Ex
 
 #include <stdio.h>
 #include <unistd.h>
+#include <pthread.h>
+#include <stdlib.h>
 
 __warn_references(tmpnam,
     "warning: tmpnam() possibly used unsafely; consider using mkstemp()");
 
 extern char *_mktemp(char *);
 
+static char *tmpnam_buf = NULL;
+static pthread_once_t tmpnam_buf_control = PTHREAD_ONCE_INIT;
+
+static void tmpnam_buf_allocate(void)
+{
+       tmpnam_buf = malloc(L_tmpnam);
+}
+
 char *
 tmpnam(s)
        char *s;
 {
        static u_long tmpcount;
-       static char buf[L_tmpnam];
 
-       if (s == NULL)
-               s = buf;
+       if (s == NULL) {
+               if (pthread_once(&tmpnam_buf_control, tmpnam_buf_allocate)
+                       || !tmpnam_buf) {
+                       return NULL;
+               }
+               s = tmpnam_buf;
+       }
        (void)snprintf(s, L_tmpnam, "%stmp.%lu.XXXXXX", P_tmpdir, tmpcount);
        ++tmpcount;
        return (_mktemp(s));