random: Add a feature to close device file descriptors.

* src/gcrypt.h.in (GCRYCTL_CLOSE_RANDOM_DEVICE): New.
* src/global.c (_gcry_vcontrol): Call _gcry_random_close_fds.
* random/random.c (_gcry_random_close_fds): New.
* random/random-csprng.c (_gcry_rngcsprng_close_fds): New.
* random/random-fips.c (_gcry_rngfips_close_fds): New.
* random/random-system.c (_gcry_rngsystem_close_fds): New.
* random/rndlinux.c (open_device): Add arg retry.
(_gcry_rndlinux_gather_random): Add mode to close open fds.

* tests/random.c (check_close_random_device): New.
(main): Call new test.

Signed-off-by: Werner Koch <wk@gnupg.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/random/random.h b/random/random.h
index aae07ab0..2bc8cabc 100644
--- a/random/random.h
+++ b/random/random.h
@@ -28,6 +28,7 @@ void _gcry_register_random_progress (void (*cb)(void *,const char*,int,int,int),
 
 void _gcry_set_preferred_rng_type (int type);
 void _gcry_random_initialize (int full);
+void _gcry_random_close_fds (void);
 int  _gcry_get_rng_type (int ignore_fips_mode);
 void _gcry_random_dump_stats(void);
 void _gcry_secure_random_alloc(void);