fix double errno-decoding in the old-kernel fallback path of pipe2

this bug seems to have caused any failure by pipe2 on such systems to
set errno to 1, rather than the proper error code.

diff --git a/src/unistd/pipe2.c b/src/unistd/pipe2.c
index 04e0c12..973e8ec 100644 (file)
--- a/src/unistd/pipe2.c
+++ b/src/unistd/pipe2.c
@@ -8,7 +8,7 @@ int pipe2(int fd[2], int flag)
        if (!flag) return syscall(SYS_pipe, fd);
        int ret = __syscall(SYS_pipe2, fd, flag);
        if (ret != -ENOSYS) return __syscall_ret(ret);
-       ret = syscall(SYS_pipe, fd);
+       ret = __syscall(SYS_pipe, fd);
        if (ret) return __syscall_ret(ret);
        if (flag & O_CLOEXEC) {
                fcntl(fd[0], F_SETFD, FD_CLOEXEC);