27 lines
760 B
C
27 lines
760 B
C
/*
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* This file is part of the UCB release of Plan 9. It is subject to the license
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* terms in the LICENSE file found in the top-level directory of this
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* distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
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* part of the UCB release of Plan 9, including this file, may be copied,
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* modified, propagated, or distributed except according to the terms contained
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* in the LICENSE file.
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*/
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#include <u.h>
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#include <libc.h>
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uint32_t
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jehanne_truerand(void)
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{
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uint32_t x;
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static int randfd = -1;
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if(randfd < 0)
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randfd = sys_open("/dev/random", OREAD|OCEXEC);
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if(randfd < 0)
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jehanne_sysfatal("can't open /dev/random");
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if(jehanne_read(randfd, &x, sizeof(x)) != sizeof(x))
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jehanne_sysfatal("can't read /dev/random");
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return x;
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}
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