Add kill()

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@108 42af7a65-404d-4744-a932-0658087f49c3

1 files changed, 134 insertions, 0 deletions

diff --git a/nuttx/sched/sig_kill.c b/nuttx/sched/sig_kill.c
new file mode 100644
index 000000000..db9a73ba2
--- /dev/null
+++ b/nuttx/sched/sig_kill.c
@@ -0,0 +1,134 @@
+/************************************************************
+ * sig_kill.c
+ *
+ *   Copyright (C) 2007 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name Gregory Nutt nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************/
+
+/************************************************************
+ * Included Files
+ ************************************************************/
+
+#include <nuttx/config.h>
+#include <sched.h>
+#include <errno.h>
+#include <debug.h>
+#include "os_internal.h"
+#include "sig_internal.h"
+
+/************************************************************
+ * Global Functions
+ ************************************************************/
+
+/************************************************************
+ * Function:  kill
+ *
+ * Description:
+ *   The kill() system call can be used to send any signal to
+ *   any task.
+ *
+ *   Limitation: Sending of signals to 'process groups' is
+ *   not supported in NuttX
+ *
+ * Parameters:
+ *   pid - The id of the task to receive the signal.  The
+ *     POSIX kill specification encodes process group
+ *     information as zero and negative pid values.  Only
+ *     positive, non-zero values of pid are supported by this
+ *     implementation.
+ *   signo - The signal number to send.
+ *
+ * Return Value:
+ *    On  success (at least one signal was sent), zero is
+ *    returned.  On error, -1 is returned, and errno is set
+ *    appropriately.
+ *
+ *    EINVAL An invalid signal was specified.
+ *    EPERM  The process does not have permission to send the
+ *           signal to any of the target processes.
+ *    ESRCH  The pid or process group does not exist.
+ *    ENOSYS Do not support sending signals to process groups.
+ *
+ * Assumptions:
+ *
+ ************************************************************/
+
+int kill(pid_t pid, int signo)
+{
+  FAR _TCB *stcb;
+  siginfo_t info;
+  int       ret = ERROR;
+
+  /* We do not support sending signals to process groups */
+
+  if (pid <= 0)
+    {
+      *get_errno_ptr() = ENOSYS;
+      return ERROR;
+    }
+
+  /* Make sure that the signal is valid */
+
+  if (!GOOD_SIGNO(signo))
+    {
+      *get_errno_ptr() = EINVAL;
+      return ERROR;
+    }
+
+  /* Keep things stationary through the following */
+
+  sched_lock();
+
+  /* Get the TCB of the receiving task */
+
+  stcb = sched_gettcb(pid);
+  dbg("TCB=0x%08x signo=%d\n", stcb, signo);
+  if (!stcb)
+    {
+      *get_errno_ptr() = ESRCH;
+      sched_unlock();
+      return ERROR;
+    }
+
+  /* Create the siginfo structure */
+
+  info.si_signo           = signo;
+  info.si_code            = SI_USER;
+  info.si_value.sival_ptr = NULL;
+
+  /* Send the signal */
+
+  ret = sig_received(stcb, &info);
+  sched_unlock();
+  return ret;
+}
+
+