39 lines
861 B
C
39 lines
861 B
C
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#include <time.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include "log.h"
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#include "io.h"
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// Generate a 32-bit pseudorandom number using libc rand()
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uint32_t libc_random_u32(void)
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{
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static int initialized;
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if (initialized)
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return rand();
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uint32_t seed;
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int fd = open("/dev/urandom", O_RDONLY);
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if (fd != -1) {
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int r = safe_read(fd, (char *)&seed, sizeof seed);
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if (r == -1) {
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log_warning("Could not read /dev/urandom: %s", strerror(errno));
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close(fd);
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seed = time(0);
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}
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} else {
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log_warning("Could not open /dev/urandom: %s", strerror(errno));
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seed = time(0);
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}
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srand(seed);
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initialized = 1;
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return rand();
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}
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