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4c61ae261ea329295dd22e89a599733b190741ae
[musl]
/
src
/
misc
/
getentropy.c
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#include <sys/random.h>
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#include <pthread.h>
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#include <errno.h>
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int getentropy(void *buffer, size_t len)
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{
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int cs, ret;
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char *pos = buffer;
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if (len > 256) {
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errno = EIO;
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return -1;
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}
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pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
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while (len) {
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ret = getrandom(pos, len, 0);
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if (ret < 0) {
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if (errno == EINTR) continue;
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else break;
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}
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pos += ret;
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len -= ret;
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ret = 0;
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}
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pthread_setcancelstate(cs, 0);
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return ret;
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}