Add comments explaining changes to upstream source files.

[wasi-libc.git] / libc-top-half / musl / src / stdio / __stdio_write.c

diff --git a/libc-top-half/musl/src/stdio/__stdio_write.c b/libc-top-half/musl/src/stdio/__stdio_write.c
index 4bcb569d1fda59ddeaea8fc4a8d909c2baa7fd37..753730493f4859678df106d9b775ab306bab2106 100644 (file)
--- a/libc-top-half/musl/src/stdio/__stdio_write.c
+++ b/libc-top-half/musl/src/stdio/__stdio_write.c
@@ -12,7 +12,7 @@ size_t __stdio_write(FILE *f, const unsigned char *buf, size_t len)
        int iovcnt = 2;
        ssize_t cnt;
        for (;;) {
-#ifdef __wasilibc_unmodified_upstream
+#ifdef __wasilibc_unmodified_upstream // WASI has no syscall
                cnt = syscall(SYS_writev, f->fd, iov, iovcnt);
 #else
                cnt = writev(f->fd, iov, iovcnt);