diff options
Diffstat (limited to 'sysdeps/posix/tempname.c')
| -rw-r--r-- | sysdeps/posix/tempname.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/sysdeps/posix/tempname.c b/sysdeps/posix/tempname.c index 088da95758..a7c125f346 100644 --- a/sysdeps/posix/tempname.c +++ b/sysdeps/posix/tempname.c @@ -107,6 +107,25 @@ # define __secure_getenv getenv #endif +#ifdef _LIBC +# include <hp-timing.h> +# if HP_TIMING_AVAIL +# define RANDOM_BITS(Var) \ + if (__builtin_expect (value == UINT64_C (0), 0)) \ + { \ + /* If this is the first time this function is used initialize \ + the variable we accumulate the value in to some somewhat \ + random value. If we'd not do this programs at startup time \ + might have a reduced set of possible names, at least on slow \ + machines. */ \ + struct timeval tv; \ + __gettimeofday (&tv, NULL); \ + value = ((uint64_t) tv.tv_usec << 16) ^ tv.tv_sec; \ + } \ + HP_TIMING_NOW (Var) +# endif +#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 |