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authorUlrich Drepper <drepper@redhat.com>2001-03-19 23:34:54 +0000
committerUlrich Drepper <drepper@redhat.com>2001-03-19 23:34:54 +0000
commitf2615995a753b80dd8d9fce55f5e87e8105f2d82 (patch)
tree3a5196fcebde20a334b70bd82fbbfb9a2269576c /sysdeps/posix
parent96c0d65dc3644467a0521cc4084274be073fb5e0 (diff)
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Update.
* sysdeps/unix/i386/i686/tempname.c: New file. * sysdeps/posix/tempname.c (__gen_tempname): If RANDOM_BITS is defined use this macro to get some bits of randomness instead of the usual gettimeofday or time calls. 2001-03-16 Paul Eggert <eggert@twinsun.com> * sysdeps/posix/tempname.c (uint64_t): Define to uintmax_t if not defined, and if UINT64_MAX is not defined. 2001-03-19 Ulrich Drepper <drepper@redhat.com>
Diffstat (limited to 'sysdeps/posix')
-rw-r--r--sysdeps/posix/tempname.c17
1 files changed, 15 insertions, 2 deletions
diff --git a/sysdeps/posix/tempname.c b/sysdeps/posix/tempname.c
index ae22f10df9..088da95758 100644
--- a/sysdeps/posix/tempname.c
+++ b/sysdeps/posix/tempname.c
@@ -107,6 +107,15 @@
# define __secure_getenv getenv
#endif
+/* Use the widest available unsigned type if uint64_t is not
+ available. The algorithm below extracts a number less than 62**6
+ (approximately 2**35.725) from uint64_t, so ancient hosts where
+ uintmax_t is only 32 bits lose about 3.725 bits of randomness,
+ which is better than not having mkstemp at all. */
+#if !defined UINT64_MAX && !defined uint64_t
+# define uint64_t uintmax_t
+#endif
+
/* Return nonzero if DIR is an existent directory. */
static int
direxists (const char *dir)
@@ -218,14 +227,18 @@ __gen_tempname (char *tmpl, int kind)
XXXXXX = &tmpl[len - 6];
/* Get some more or less random data. */
-#if HAVE_GETTIMEOFDAY || _LIBC
+#ifdef RANDOM_BITS
+ RANDOM_BITS (random_time_bits);
+#else
+# if HAVE_GETTIMEOFDAY || _LIBC
{
struct timeval tv;
__gettimeofday (&tv, NULL);
random_time_bits = ((uint64_t) tv.tv_usec << 16) ^ tv.tv_sec;
}
-#else
+# else
random_time_bits = time (NULL);
+# endif
#endif
value += random_time_bits ^ __getpid ();