X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=src%2Fmisc%2Fptrace.c;h=83b8022beefa8afc9abeb19dfc7e9bac35d605e8;hb=b1b3d3525bbc50a6781f57bfe423c7e18d64f625;hp=1cc00167331c83639230cb6484e9dede5f299f41;hpb=71f7a3c2ce7377a6c77f46524002505b9454861b;p=musl

diff --git a/src/misc/ptrace.c b/src/misc/ptrace.c
index 1cc00167..83b8022b 100644
--- a/src/misc/ptrace.c
+++ b/src/misc/ptrace.c
@@ -8,11 +8,18 @@ long ptrace(int req, ...)
 	va_list ap;
 	pid_t pid;
 	void *addr, *data, *addr2;
+	long ret, result;
+
 	va_start(ap, req);
 	pid = va_arg(ap, pid_t);
 	addr = va_arg(ap, void *);
 	data = va_arg(ap, void *);
 	addr2 = va_arg(ap, void *);
 	va_end(ap);
-	return syscall(SYS_ptrace, req, pid, addr, data, addr2);
+
+	if (req-1U < 3) data = &result;
+	ret = syscall(SYS_ptrace, req, pid, addr, data, addr2);
+
+	if (ret < 0 || req-1U >= 3) return ret;
+	return result;
 }