Add si_errno to siginfo_t

include/signal.h

@@ -216,6 +216,7 @@ struct siginfo
 {
   uint8_t      si_signo;     /* Identifies signal */
   uint8_t      si_code;      /* Source: SI_USER, SI_QUEUE, SI_TIMER, SI_ASYNCIO, or SI_MESGQ */
+  uint8_t      si_errno;     /* Zero or errno value associated with signal */
   union sigval si_value;     /* Data passed with signal */
 #ifdef CONFIG_SCHED_HAVE_PARENT
   pid_t        si_pid;       /* Sending task ID */

sched/pthread/pthread_condtimedwait.c

 /****************************************************************************
  * sched/pthread/pthread_condtimedwait.c
  *
- *   Copyright (C) 2007-2009, 2013-2014 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007-2009, 2013-2015 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -119,6 +119,7 @@ static void pthread_condtimedout(int argc, uint32_t pid, uint32_t signo)
 
       info.si_signo           = signo;
       info.si_code            = SI_QUEUE;
+      info.si_errno           = ETIMEDOUT;
       info.si_value.sival_ptr = NULL;
 #ifdef CONFIG_SCHED_HAVE_PARENT
       info.si_pid             = (pid_t)pid;

sched/pthread/pthread_kill.c

@@ -116,6 +116,7 @@ int pthread_kill(pthread_t thread, int signo)
 
   info.si_signo           = signo;
   info.si_code            = SI_USER;
+  info.si_errno           = EINTR;
   info.si_value.sival_ptr = NULL;
 #ifdef CONFIG_SCHED_HAVE_PARENT
   info.si_pid             = rtcb->pid;

sched/sched/sched_waitid.c

@@ -68,11 +68,12 @@ static void exited_child(FAR struct tcb_s *rtcb, FAR struct child_status_s *chil
                           FAR siginfo_t *info)
 {
   /* The child has exited. Return the saved exit status (and some fudged
-   * information.
+   * information).
    */
 
   info->si_signo           = SIGCHLD;
   info->si_code            = CLD_EXITED;
+  info->si_errno           = OK;
   info->si_value.sival_ptr = NULL;
   info->si_pid             = child->ch_pid;
   info->si_status          = child->ch_status;

sched/signal/sig_kill.c

 /************************************************************************
  * sched/signal/sig_kill.c
  *
- *   Copyright (C) 2007, 2009, 2011, 2013 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007, 2009, 2011, 2013, 2015 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -114,6 +114,7 @@ int kill(pid_t pid, int signo)
 
   info.si_signo           = signo;
   info.si_code            = SI_USER;
+  info.si_errno           = EINTR;
   info.si_value.sival_ptr = NULL;
 #ifdef CONFIG_SCHED_HAVE_PARENT
   info.si_pid             = rtcb->pid;

sched/signal/sig_mqnotempty.c

 /****************************************************************************
  * sched/signal/sig_mqnotempty.c
  *
- *   Copyright (C) 2007-2009, 2013 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007-2009, 2013, 2015 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -112,6 +112,7 @@ int sig_mqnotempty(int pid, int signo, void *sival_ptr)
 
   info.si_signo           = signo;
   info.si_code            = SI_MESGQ;
+  info.si_errno           = OK;
 #ifdef CONFIG_CAN_PASS_STRUCTS
   info.si_value           = value;
 #else

sched/signal/sig_queue.c

@@ -135,6 +135,7 @@ int sigqueue(int pid, int signo, void *sival_ptr)
 
   info.si_signo           = signo;
   info.si_code            = SI_QUEUE;
+  info.si_errno           = OK;
 #ifdef CONFIG_CAN_PASS_STRUCTS
   info.si_value           = value;
 #else

sched/signal/sig_timedwait.c

@@ -115,6 +115,7 @@ static void sig_timeout(int argc, wdparm_t itcb)
     {
       u.wtcb->sigunbinfo.si_signo           = SIG_WAIT_TIMEOUT;
       u.wtcb->sigunbinfo.si_code            = SI_TIMER;
+      u.wtcb->sigunbinfo.si_errno           = ETIMEDOUT;
       u.wtcb->sigunbinfo.si_value.sival_int = 0;
 #ifdef CONFIG_SCHED_HAVE_PARENT
       u.wtcb->sigunbinfo.si_pid             = 0;  /* Not applicable */

sched/task/task_exithook.c

 /****************************************************************************
  * sched/task/task_exithook.c
  *
- *   Copyright (C) 2011-2013 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2011-2013, 2015 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -343,6 +343,7 @@ static inline void task_sigchild(gid_t pgid, FAR struct tcb_s *ctcb, int status)
 
       info.si_signo           = SIGCHLD;
       info.si_code            = CLD_EXITED;
+      info.si_errno           = OK;
       info.si_value.sival_ptr = NULL;
 #ifndef CONFIG_DISABLE_PTHREAD
       info.si_pid             = chgrp->tg_task;
@@ -394,6 +395,7 @@ static inline void task_sigchild(FAR struct tcb_s *ptcb,
 
       info.si_signo           = SIGCHLD;
       info.si_code            = CLD_EXITED;
+      info.si_errno           = OK;
       info.si_value.sival_ptr = NULL;
 #ifndef CONFIG_DISABLE_PTHREAD
       info.si_pid             = ctcb->group->tg_task;

sched/timer/timer_settime.c

@@ -100,6 +100,7 @@ static inline void timer_sigqueue(FAR struct posix_timer_s *timer)
 
   info.si_signo           = timer->pt_signo;
   info.si_code            = SI_TIMER;
+  info.si_errno           = OK;
 #ifdef CONFIG_CAN_PASS_STRUCTS
   info.si_value           = timer->pt_value;
 #else