termios: Add Capability to Generate SIGINTR and SIGQUIT

This patch adds the ability for termios to send SIGINTR on receipt
of VINTR and SIGQUIT for VKILL and return -1/EINTR from read() on
a termios channel. Importantly, this patch does not alter the default
behavior or force POSIX signal code in just because termios is used.
The application must explicitly enable the POSIX behavior of generating
a signal upon receipt of these characters. This is discussed in the
POSIX standard:

   https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap11.html

Closes #3800.

1 files changed, 8 insertions, 1 deletions

diff --git a/cpukit/include/rtems/rtems/status.h b/cpukit/include/rtems/rtems/status.h
index 88ae576eac..7310fe905b 100644
--- a/cpukit/include/rtems/rtems/status.h
+++ b/cpukit/include/rtems/rtems/status.h
@@ -167,6 +167,12 @@ typedef enum {
    */
   RTEMS_IO_ERROR                 = 27,
   /**
+   *  This is the status used internally to indicate a blocking device
+   *  driver call has been interrupted and should be reflected to the
+   *  called as an INTERRUPTED.
+   */
+  RTEMS_INTERRUPTED              = 28,
+  /**
    *  This is the status is used internally to RTEMS when performing
    *  operations on behalf of remote tasks.  This is referred to as
    *  proxying operations and this status indicates that the operation
@@ -174,7 +180,7 @@ typedef enum {
    *
    *  @note This status will @b NOT be returned to the user.
    */
-  RTEMS_PROXY_BLOCKING           = 28
+  RTEMS_PROXY_BLOCKING           = 29
 } rtems_status_code;
 
 /**
@@ -235,6 +241,7 @@ RTEMS_INLINE_ROUTINE bool rtems_are_statuses_equal(
  *  @retval ENODEV RTEMS_UNSATISFIED
  *  @retval ENOSYS RTEMS_NOT_IMPLEMENTED, RTEMS_NOT_CONFIGURED
  *  @retval ENOMEM RTEMS_NO_MEMORY
+ *  @retval EINTR RTEMS_INTERRUPTED
  */
 int rtems_status_code_to_errno(rtems_status_code sc);