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-rw-r--r--libc/libc-test/src/cmsg.c28
1 files changed, 28 insertions, 0 deletions
diff --git a/libc/libc-test/src/cmsg.c b/libc/libc-test/src/cmsg.c
new file mode 100644
index 0000000..a8b1c37
--- /dev/null
+++ b/libc/libc-test/src/cmsg.c
@@ -0,0 +1,28 @@
+#include <sys/param.h>
+#include <sys/socket.h>
+
+// Since the cmsg(3) macros are macros instead of functions, they aren't
+// available to FFI. libc must reimplement them, which is error-prone. This
+// file provides FFI access to the actual macros so they can be tested against
+// the Rust reimplementations.
+
+struct cmsghdr *cmsg_firsthdr(struct msghdr *msgh) {
+ return CMSG_FIRSTHDR(msgh);
+}
+
+struct cmsghdr *cmsg_nxthdr(struct msghdr *msgh, struct cmsghdr *cmsg) {
+ return CMSG_NXTHDR(msgh, cmsg);
+}
+
+size_t cmsg_space(size_t length) {
+ return CMSG_SPACE(length);
+}
+
+size_t cmsg_len(size_t length) {
+ return CMSG_LEN(length);
+}
+
+unsigned char *cmsg_data(struct cmsghdr *cmsg) {
+ return CMSG_DATA(cmsg);
+}
+