Add a "fork" of musl as //fusl.

fusl/src/passwd/getgr_r.c

Index: fusl/src/passwd/getgr_r.c
diff --git a/fusl/src/passwd/getgr_r.c b/fusl/src/passwd/getgr_r.c
new file mode 100644
index 0000000000000000000000000000000000000000..7246e8a42d38793917def24e1dcd3f6c8caec85a
--- /dev/null
+++ b/fusl/src/passwd/getgr_r.c
@@ -0,0 +1,48 @@
+#include "pwf.h"
+#include <pthread.h>
+
+#define FIX(x) (gr->gr_##x = gr->gr_##x-line+buf)
+
+static int getgr_r(const char *name, gid_t gid, struct group *gr, char *buf, size_t size, struct group **res)
+{
+	char *line = 0;
+	size_t len = 0;
+	char **mem = 0;
+	size_t nmem = 0;
+	int rv = 0;
+	size_t i;
+	int cs;
+
+	pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
+
+	rv = __getgr_a(name, gid, gr, &line, &len, &mem, &nmem, res);
+	if (*res && size < len + (nmem+1)*sizeof(char *) + 32) {
+		*res = 0;
+		rv = ERANGE;
+	}
+	if (*res) {
+		buf += (16-(uintptr_t)buf)%16;
+		gr->gr_mem = (void *)buf;
+		buf += (nmem+1)*sizeof(char *);
+		memcpy(buf, line, len);
+		FIX(name);
+		FIX(passwd);
+		for (i=0; mem[i]; i++)
+			gr->gr_mem[i] = mem[i]-line+buf;
+		gr->gr_mem[i] = 0;
+	}
+ 	free(mem);
+ 	free(line);
+	pthread_setcancelstate(cs, 0);
+	return rv;
+}
+
+int getgrnam_r(const char *name, struct group *gr, char *buf, size_t size, struct group **res)
+{
+	return getgr_r(name, 0, gr, buf, size, res);
+}
+
+int getgrgid_r(gid_t gid, struct group *gr, char *buf, size_t size, struct group **res)
+{
+	return getgr_r(0, gid, gr, buf, size, res);
+}