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Differential D17049 Diff 47700 sys/dev/random/randomdev.c

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sys/dev/random/randomdev.c

Show First 20 Lines • Show All 150 Lines • ▼ Show 20 Lines while (!p_random_alg_context->ra_seeded()) {
p_random_alg_context->ra_pre_read(); p_random_alg_context->ra_pre_read();
/* Only bother the console every 10 seconds or so */ /* Only bother the console every 10 seconds or so */
if (spamcount == 0) if (spamcount == 0)
printf("random: %s unblock wait\n", __func__); printf("random: %s unblock wait\n", __func__);
spamcount = (spamcount + 1)%100; spamcount = (spamcount + 1)%100;
error = tsleep(&random_alg_context, PCATCH, "randseed", hz/10); error = tsleep(&random_alg_context, PCATCH, "randseed", hz/10);
if (error == ERESTART || error == EINTR) if (error == ERESTART || error == EINTR)
break; break;
/* Squash tsleep timeout condition */
if (error == EWOULDBLOCK)
error = 0;
KASSERT(error == 0, ("unexpected tsleep error %d", error));
} }
if (error == 0) { if (error == 0) {
read_rate_increment((uio->uio_resid + sizeof(uint32_t))/sizeof(uint32_t)); read_rate_increment((uio->uio_resid + sizeof(uint32_t))/sizeof(uint32_t));
total_read = 0; total_read = 0;
while (uio->uio_resid && !error) { while (uio->uio_resid && !error) {
read_len = uio->uio_resid; read_len = uio->uio_resid;
/* /*
* Belt-and-braces. * Belt-and-braces.
Show All 12 Lines while (uio->uio_resid && !error) {
*/ */
error = uiomove(random_buf, c, uio); error = uiomove(random_buf, c, uio);
total_read += c; total_read += c;
/* /*
* Poll for signals every few MBs to avoid very long * Poll for signals every few MBs to avoid very long
* uninterruptible syscalls. * uninterruptible syscalls.
*/ */
if (error == 0 && uio->uio_resid != 0 && if (error == 0 && uio->uio_resid != 0 &&
total_read % sigchk_period == 0) total_read % sigchk_period == 0) {
error = tsleep_sbt(&random_alg_context, PCATCH, error = tsleep_sbt(&random_alg_context, PCATCH,
"randrd", SBT_1NS, 0, C_HARDCLOCK); "randrd", SBT_1NS, 0, C_HARDCLOCK);
/* Squash tsleep timeout condition */
if (error == EWOULDBLOCK)
error = 0;
}
} }
if (error == ERESTART || error == EINTR) if (error == ERESTART || error == EINTR)
error = 0; error = 0;
} }
free(random_buf, M_ENTROPY); free(random_buf, M_ENTROPY);
return (error); return (error);
} }
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