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/* See LICENSE file for copyright and license details. */
#include "common.h"
#ifndef TEST
const unsigned char *volatile libtest_random_pattern = NULL;
volatile size_t libtest_random_pattern_length = 0u;
volatile size_t libtest_random_pattern_offset = 0u;
static ssize_t
genpattern(void *buf, size_t size)
{
unsigned char *out = buf;
size_t n;
ssize_t ret;
if (size > (size_t)SSIZE_MAX)
size = (size_t)SSIZE_MAX;
ret = (ssize_t)size;
if (libtest_random_pattern_length) {
while (size) {
if (libtest_random_pattern_offset == libtest_random_pattern_length)
libtest_random_pattern_offset = 0u;
n = libtest_random_pattern_length - libtest_random_pattern_offset;
if (n > size)
n = size;
memcpy(out, &libtest_random_pattern[libtest_random_pattern_offset], n);
out = &out[n];
size -= n;
libtest_random_pattern_offset += n;
}
} else {
for (; size; size--, out++)
out[0] = (unsigned char)rand();
}
return ret;
}
#if defined(__linux__)
volatile int libtest_getrandom_real = 1;
volatile int libtest_getrandom_error = 0;
volatile size_t libtest_getrandom_max_return = SIZE_MAX;
ssize_t
(getrandom)(void *buf, size_t size, unsigned int flags)
{
if (size > libtest_getrandom_max_return)
size = libtest_getrandom_max_return;
if (libtest_getrandom_error) {
errno = libtest_getrandom_error;
if (libtest_getrandom_error == EINTR)
libtest_getrandom_error = 0;
return -1;
}
if (!libtest_getrandom_real)
return genpattern(buf, size);
# if defined(SYS_getrandom)
return syscall(SYS_getrandom, buf, size, flags);
# else
errno = ENOSYS;
return -1;
# endif
}
#endif
volatile int libtest_getentropy_real = 1;
volatile int libtest_getentropy_error = 0;
volatile size_t libtest_getentropy_calls = 0u;
volatile int libtest_getentropy_jmp_val = 0;
jmp_buf libtest_getentropy_jmp;
int
(getentropy)(void *buf, size_t size)
{
unsigned char *out = buf;
ssize_t r;
libtest_getentropy_calls += 1u;
if (libtest_getentropy_jmp_val)
longjmp(libtest_getentropy_jmp, libtest_getentropy_jmp_val);
if (libtest_getentropy_error) {
errno = libtest_getentropy_error;
if (libtest_getentropy_error == EINTR)
libtest_getentropy_error = 0;
return -1;
}
if (size > 256u) {
errno = EIO;
return -1;
}
if (!libtest_getentropy_real) {
r = genpattern(out, size);
if (r == (ssize_t)size)
return 0;
errno = EIO;
return -1;
}
#if defined(__linux__) && defined(SYS_getrandom)
while (size) {
r = (ssize_t)syscall(SYS_getrandom, out, size, 0);
if (r < 0) {
if (errno == EINTR)
continue;
if (errno != ENOSYS)
errno = EIO;
return -1;
}
out = &out[r];
size -= (size_t)r;
}
return 0;
#else
errno = ENOSYS;
return -1;
#endif
}
#else
CONST int
main(void)
{
/* TODO maybe test */
return 0;
}
#endif
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