fix ftello result for append streams with unflushed output

[musl] / src / stdio / __fdopen.c

diff --git a/src/stdio/__fdopen.c b/src/stdio/__fdopen.c
index 59690f6..a2ca62b 100644 (file)
--- a/src/stdio/__fdopen.c
+++ b/src/stdio/__fdopen.c
@@ -33,6 +33,7 @@ FILE *__fdopen(int fd, const char *mode)
        if (*mode == 'a') {
                int flags = __syscall(SYS_fcntl, fd, F_GETFL);
                __syscall(SYS_fcntl, fd, F_SETFL, flags | O_APPEND);
+               f->flags |= F_APP;
        }
 
        f->fd = fd;