Merge pull request #4825 from proller/fix24

Add libglibc-compatibility/musl/getentropy.c

libs/libglibc-compatibility/CMakeLists.txt

@@ -19,6 +19,7 @@ musl/sched_cpucount.c
 musl/glob.c
 musl/exp2f.c
 musl/pwritev.c
+musl/getentropy.c
 musl/getrandom.c
 musl/fcntl.c
 musl/timespec_get.c

libs/libglibc-compatibility/musl/getentropy.c

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