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// version 20230919
// public domain
// djb
// 20230919: fixing main getentropy() call; tnx jan mojzis
#include <unistd.h>
// automatic-alternatives 2
#ifdef getentropy_wrapper_2
#include "getentropy_wrapper.h"
int getentropy_wrapper_ready(void)
{
return 0;
}
void getentropy_wrapper(void *x,long long xbytes)
{
for (;;) pause();
}
#else
#include <errno.h>
#include <signal.h>
#include "getentropy_wrapper.h"
static int getentropy_wrapper_ready_core(void)
{
char ch;
int r;
for (;;) {
errno = 0;
r = getentropy(&ch,1);
if (r == 0) return 1;
if (r == -1 && errno == ENOSYS) return 0;
if (r == -1 && errno == EPERM) return 0;
if (r == -1 && errno == EIO) return 0;
}
}
int getentropy_wrapper_ready(void)
{
struct sigaction old_sigsys;
int result;
sigaction(SIGSYS,0,&old_sigsys);
signal(SIGSYS,SIG_IGN);
result = getentropy_wrapper_ready_core();
sigaction(SIGSYS,&old_sigsys,0);
return result;
}
void getentropy_wrapper(void *x,long long xbytes)
{
while (xbytes > 0) {
// getentropy fails for >256 bytes
int todo = 256;
if (xbytes < 256) todo = xbytes;
if (getentropy(x,todo) != 0) {
sleep(1);
continue;
}
x += todo;
xbytes -= todo;
}
}
#endif
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