Add some more debugging.

diff --git a/src/exec_pty.c b/src/exec_pty.c
index 3175813be64bf8397d4e84aca44979fd43130a20..422989275e415f0a86ca148f2c19c30bad2f9038 100644 (file)
--- a/src/exec_pty.c
+++ b/src/exec_pty.c
@@ -446,10 +446,14 @@ perform_io(fd_set *fdsr, fd_set *fdsw, struct command_status *cstat)
                    /* FALLTHROUGH */
                case 0:
                    /* got EOF or pty has gone away */
+                   sudo_debug_printf(SUDO_DEBUG_INFO,
+                       "read EOF from fd %d", iob->rfd);
                    safe_close(iob->rfd);
                    iob->rfd = -1;
                    break;
                default:
+                   sudo_debug_printf(SUDO_DEBUG_INFO,
+                       "read %d bytes from fd %d", n, iob->rfd);
                    if (!iob->action(iob->buf + iob->len, n))
                        terminate_child(child, true);
                    iob->len += n;
@@ -463,6 +467,9 @@ perform_io(fd_set *fdsr, fd_set *fdsw, struct command_status *cstat)
            } while (n == -1 && errno == EINTR);
            if (n == -1) {
                if (errno == EPIPE || errno == ENXIO || errno == EBADF) {
+                   sudo_debug_printf(SUDO_DEBUG_INFO,
+                       "unable to write %d bytes to fd %d",
+                           iob->len - iob->off, iob->wfd);
                    /* other end of pipe closed or pty revoked */
                    if (iob->rfd != -1) {
                        safe_close(iob->rfd);
@@ -478,6 +485,8 @@ perform_io(fd_set *fdsr, fd_set *fdsw, struct command_status *cstat)
                        "error writing fd %d: %s", iob->wfd, strerror(errno));
                }
            } else {
+               sudo_debug_printf(SUDO_DEBUG_INFO,
+                   "wrote %d bytes to fd %d", n, iob->wfd);
                iob->off += n;
            }
        }
@@ -552,6 +561,7 @@ fork_pty(struct command_details *details, int sv[], int *maxfd)
      */
     memset(io_pipe, 0, sizeof(io_pipe));
     if (io_fds[SFD_STDIN] == -1 || !isatty(STDIN_FILENO)) {
+       sudo_debug_printf(SUDO_DEBUG_INFO, "stdin not a tty, creating a pipe");
        pipeline = true;
        if (pipe(io_pipe[STDIN_FILENO]) != 0)
            error(1, _("unable to create pipe"));
@@ -560,6 +570,7 @@ fork_pty(struct command_details *details, int sv[], int *maxfd)
        io_fds[SFD_STDIN] = io_pipe[STDIN_FILENO][0];
     }
     if (io_fds[SFD_STDOUT] == -1 || !isatty(STDOUT_FILENO)) {
+       sudo_debug_printf(SUDO_DEBUG_INFO, "stdout not a tty, creating a pipe");
        pipeline = true;
        if (pipe(io_pipe[STDOUT_FILENO]) != 0)
            error(1, _("unable to create pipe"));
@@ -568,6 +579,7 @@ fork_pty(struct command_details *details, int sv[], int *maxfd)
        io_fds[SFD_STDOUT] = io_pipe[STDOUT_FILENO][1];
     }
     if (io_fds[SFD_STDERR] == -1 || !isatty(STDERR_FILENO)) {
+       sudo_debug_printf(SUDO_DEBUG_INFO, "stderr not a tty, creating a pipe");
        if (pipe(io_pipe[STDERR_FILENO]) != 0)
            error(1, _("unable to create pipe"));
        iobufs = io_buf_new(io_pipe[STDERR_FILENO][0], STDERR_FILENO,