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Fix getrandom for system with libc not including errno or systems 

not supporting ENOSYS in the first place.

Fixes GH-347
pull/364/head
Nils Maier 2015-03-04 19:40:19 +01:00
parent 1ad1d43a6a
commit ee63dff225
1 changed files with 11 additions and 1 deletions
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12
src/SimpleRandomizer.cc
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@ -46,6 +46,8 @@
#include "fmt.h" #include "fmt.h"
#ifdef HAVE_GETRANDOM_INTERFACE #ifdef HAVE_GETRANDOM_INTERFACE
# include <errno.h>
# include <linux/errno.h>
# include "getrandom_linux.h" # include "getrandom_linux.h"
#endif #endif
@ -95,7 +97,15 @@ void SimpleRandomizer::getRandomBytes(unsigned char* buf, size_t len)
static bool have_random_support = true; static bool have_random_support = true;
if (have_random_support) { if (have_random_support) {
auto rv = getrandom_linux(buf, len); auto rv = getrandom_linux(buf, len);
if (rv != -1 || errno != ENOSYS) { if (rv != -1
#ifdef ENOSYS
/* If the system does not know ENOSYS at this point, just leave the
* check out. If the call failed, we'll not take this branch at all
* and disable support below.
*/
|| errno != ENOSYS
#endif
) {
if (rv < -1) { if (rv < -1) {
A2_LOG_ERROR(fmt("Failed to produce randomness: %d", errno)); A2_LOG_ERROR(fmt("Failed to produce randomness: %d", errno));
} }