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-rw-r--r--libc-top-half/musl/src/misc/getentropy.c33
1 files changed, 33 insertions, 0 deletions
diff --git a/libc-top-half/musl/src/misc/getentropy.c b/libc-top-half/musl/src/misc/getentropy.c
new file mode 100644
index 0000000..651ea95
--- /dev/null
+++ b/libc-top-half/musl/src/misc/getentropy.c
@@ -0,0 +1,33 @@
+#define _BSD_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;
+}