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Revert "Directly use getrandom system call if possible"
This reverts commit e7c82f20e3d7d7b47221b454508d07aefc14e7c0. Fix #5516
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@ -35,21 +35,17 @@ int fork_no_orphan() {
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int gen_rand_str(char *buf, int len, bool varlen) {
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constexpr char ALPHANUM[] = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
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static mt19937 gen([]{
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mt19937::result_type seed;
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if (syscall(__NR_getrandom, &seed, sizeof(seed), 0) < 0) {
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// This can happen if device is running a too low Linux version
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static std::mt19937 gen([]{
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if (access("/dev/urandom", F_OK) != 0)
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mknod("/dev/urandom", 0600 | S_IFCHR, makedev(1, 9));
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int fd = xopen("/dev/urandom", O_RDONLY | O_CLOEXEC);
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unsigned seed;
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xxread(fd, &seed, sizeof(seed));
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close(fd);
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}
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return seed;
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}());
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uniform_int_distribution<int> dist(0, sizeof(ALPHANUM) - 2);
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std::uniform_int_distribution<int> dist(0, sizeof(ALPHANUM) - 2);
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if (varlen) {
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uniform_int_distribution<int> len_dist(len / 2, len);
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std::uniform_int_distribution<int> len_dist(len / 2, len);
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len = len_dist(gen);
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}
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for (int i = 0; i < len - 1; ++i)
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