[Bug 9851] New: vi: can't read user input if stdin is left in non-blocking mode

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=9851

            Bug ID: 9851
           Summary: vi: can't read user input if stdin is left in
                    non-blocking mode
           Product: Busybox
           Version: 1.24.x
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: minor
          Priority: P5
         Component: Other
          Assignee: unassigned at busybox.net
          Reporter: daniel.f.starke at freenet.de
                CC: busybox-cvs at busybox.net
  Target Milestone: ---

Created attachment 7056
  --> https://bugs.busybox.net/attachment.cgi?id=7056&action=edit
proposed patch

Using Busybox 1.26.2 I still experience the issue that the vi will not work if
some application (mostly those using ncurses) left the standard input in
non-blocking mode. Usually there are no means to reset this state with standard
commands without restarting the current tty.
The attached file fixes this issue by forcing blocking mode to the standard
input at vi start-up.
The patch did not change the size of the vi application in my configuration.

The issue can be reproduced by the following command:
gcc -x c -o nb - <<"_C" && chmod u+rx nb && ./nb && echo abc >a.txt && vi a.txt
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

int main() {
        /* make standard input non-blocking */
        fcntl(STDIN_FILENO, F_SETFL, fcntl(STDIN_FILENO, F_GETFL) |
O_NONBLOCK);

        return EXIT_SUCCESS;
}
_C

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