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#include "randombytes.h"
#include "haslibrandombytes.h"
#ifndef HASLIBRANDOMBYTES
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
static int fd = -1;
__attribute__((constructor)) static void init(void) {
if (fd == -1) {
for (;;) {
#ifdef O_CLOEXEC
fd = open("/dev/urandom", O_RDONLY | O_CLOEXEC);
#else
fd = open("/dev/urandom", O_RDONLY);
fcntl(fd, F_SETFD, 1);
#endif
if (fd != -1) break;
sleep(1);
}
}
}
void randombytes(void *xv, long long xlen) {
long long i;
unsigned char *x = xv;
if (fd == -1) init();
while (xlen > 0) {
if (xlen < 1048576)
i = xlen;
else
i = 1048576;
i = read(fd, x, i);
if (i < 1) {
sleep(1);
continue;
}
x += i;
xlen -= i;
}
#ifdef __GNUC__
__asm__ __volatile__("" : : "r"(xv) : "memory");
#endif
}
const char *randombytes_source(void) { return "kernel-devurandom"; }
#endif
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