Bash-4.4 distribution sources and documentation

lib/sh/tmpfile.c

@@ -2,7 +2,7 @@
  * tmpfile.c - functions to create and safely open temp files for the shell.
  */
 
-/* Copyright (C) 2000 Free Software Foundation, Inc.
+/* Copyright (C) 2000-2015 Free Software Foundation, Inc.
 
    This file is part of GNU Bash, the Bourne Again SHell.
 
@@ -47,6 +47,11 @@ extern int errno;
 #define DEFAULT_TMPDIR		"."	/* bogus default, should be changed */
 #define DEFAULT_NAMEROOT	"shtmp"
 
+/* Use ANSI-C rand() interface if random(3) is not available */
+#if !HAVE_RANDOM
+#define random() rand()
+#endif
+
 extern pid_t dollar_dollar_pid;
 
 static char *get_sys_tmpdir __P((void));
@@ -109,6 +114,23 @@ get_tmpdir (flags)
   return tdir;
 }
 
+static void
+sh_seedrand ()
+{
+#if HAVE_RANDOM
+  int d;
+  static int seeded = 0;
+  if (seeded == 0)
+    {
+      struct timeval tv;
+  	      
+      gettimeofday (&tv, NULL);
+      srandom (tv.tv_sec ^ tv.tv_usec ^ (getpid () << 16) ^ (uintptr_t)&d);
+      seeded = 1;
+    }
+#endif
+}
+
 char *
 sh_mktmpname (nameroot, flags)
      char *nameroot;
@@ -117,6 +139,7 @@ sh_mktmpname (nameroot, flags)
   char *filename, *tdir, *lroot;
   struct stat sb;
   int r, tdlen;
+  static int seeded = 0;
 
   filename = (char *)xmalloc (PATH_MAX + 1);
   tdir = get_tmpdir (flags);
@@ -132,6 +155,7 @@ sh_mktmpname (nameroot, flags)
       filename = NULL;
     }
 #else  /* !USE_MKTEMP */
+  sh_seedrand ();
   while (1)
     {
       filenum = (filenum << 1) ^
@@ -162,7 +186,7 @@ sh_mktmpfd (nameroot, flags, namep)
 {
   char *filename, *tdir, *lroot;
   int fd, tdlen;
-
+  
   filename = (char *)xmalloc (PATH_MAX + 1);
   tdir = get_tmpdir (flags);
   tdlen = strlen (tdir);
@@ -181,6 +205,7 @@ sh_mktmpfd (nameroot, flags, namep)
     *namep = filename;
   return fd;
 #else /* !USE_MKSTEMP */
+  sh_seedrand ();
   do
     {
       filenum = (filenum << 1) ^