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RNDEBUG showed that using the pushb_fast will have much fewer syscalls

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tg 2010-09-19 19:21:20 +00:00
parent 915b30adfe
commit b0b03a5a75
1 changed files with 17 additions and 24 deletions
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41
var.c
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@ -26,7 +26,7 @@
#include <sys/sysctl.h>
#endif
__RCSID("$MirOS: src/bin/mksh/var.c,v 1.113 2010/09/14 21:26:19 tg Exp $");
__RCSID("$MirOS: src/bin/mksh/var.c,v 1.114 2010/09/19 19:21:20 tg Exp $");
/*
* Variables
@ -1029,10 +1029,8 @@ void
change_random(const void *vp, size_t n)
{
register uint32_t h = 0x100;
#if defined(__OpenBSD__)
int mib[2];
uint8_t k[3];
size_t klen;
#if defined(arc4random_pushb_fast) || defined(MKSH_A4PB)
uint32_t i;
#endif
kshstate_v.cr_dp = vp;
@ -1042,26 +1040,21 @@ change_random(const void *vp, size_t n)
sizeof(kshstate_v)), vp, n);
kshstate_v.lcg_state_ = oaathash_finalise(h);
#if defined(__OpenBSD__)
/* OpenBSD, MirBSD: proper kernel entropy comes at zero cost */
mib[0] = CTL_KERN;
mib[1] = KERN_ARND;
klen = sizeof(k);
sysctl(mib, 2, k, &klen, &kshstate_v.lcg_state_,
#if defined(arc4random_pushb_fast) || defined(MKSH_A4PB)
/*
* either we have very check entropy get and push available,
* with malloc() pulling in this code already anyway, or the
* user requested us to use the old functions
*/
#if defined(arc4random_pushb_fast)
arc4random_pushb_fast(&kshstate_v.lcg_state_,
sizeof(kshstate_v.lcg_state_));
/* we ignore failures and take in k anyway */
h = oaathash_update(h, k, sizeof(k));
kshstate_v.lcg_state_ = oaathash_finalise(h);
#elif defined(MKSH_A4PB)
/* forced by the user to use arc4random_pushb(3) - Cygwin? */
{
uint32_t prv;
prv = arc4random_pushb(&kshstate_v.lcg_state_,
sizeof(kshstate_v.lcg_state_));
h = oaathash_update(h, &prv, sizeof(prv));
}
i = arc4random();
#else
i = arc4random_pushb(&kshstate_v.lcg_state_,
sizeof(kshstate_v.lcg_state_));
#endif
h = oaathash_update(h, (void *)&i, sizeof(i));
kshstate_v.lcg_state_ = oaathash_finalise(h);
#endif
}