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Diffstat (limited to 'nuttx/sched/sig_queue.c')
| -rw-r--r-- | nuttx/sched/sig_queue.c | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/nuttx/sched/sig_queue.c b/nuttx/sched/sig_queue.c new file mode 100644 index 000000000..dee1c798a --- /dev/null +++ b/nuttx/sched/sig_queue.c @@ -0,0 +1,159 @@ +/**************************************************************************** + * sched/sig_queue.c + * + * Copyright (C) 2007-2009 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <gnutt@nuttx.org> + * + * 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 NuttX 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 <nuttx/compiler.h> + +#include <signal.h> +#include <debug.h> +#include <sched.h> +#include <errno.h> + +#include "os_internal.h" +#include "sig_internal.h" + +/**************************************************************************** + * Definitions + ****************************************************************************/ + +/**************************************************************************** + * Private Type Declarations + ****************************************************************************/ + +/**************************************************************************** + * Global Variables + ****************************************************************************/ + +/**************************************************************************** + * Private Variables + ****************************************************************************/ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: sigqueue + * + * Description: + * This function sends the signal specified by signo with the signal + * parameter value to the process specified by pid. + * + * If the receiving process has the signal blocked via the sigprocmask, + * the signal will pend until it is unmasked. Only one pending signal (per + * signo) is retained. This is consistent with POSIX which states, "If + * a subsequent occurrence of a pending signal is generated, it is + * implementation defined as to whether the signal is delivered more than + * once." + * + * Parameters: + * pid - Process ID of task to receive signal + * signo - Signal number + * value - Value to pass to task with signal + * + * Return Value: + * On success (at least one signal was sent), zero is returned. On + * error, -1 is returned, and errno is set appropriately: + * + * EGAIN The limit of signals which may be queued has been reached. + * EINVAL sig was invalid. + * EPERM The process does not have permission to send the + * signal to the receiving process. + * ESRCH No process has a PID matching pid. + * + * Assumptions: + * + ****************************************************************************/ + +#ifdef CONFIG_CAN_PASS_STRUCTS +int sigqueue (int pid, int signo, union sigval value) +#else +int sigqueue(int pid, int signo, void *sival_ptr) +#endif +{ + FAR _TCB *stcb; + siginfo_t info; + int ret = ERROR; + + /* Sanity checks */ + + if (!GOOD_SIGNO(signo)) + { + set_errno(EINVAL); + return ERROR; + } + + sched_lock(); + + /* Get the TCB of the receiving task */ + + stcb = sched_gettcb(pid); +#ifdef CONFIG_CAN_PASS_STRUCTS + sdbg("TCB=0x%08x signo=%d value=%d\n", stcb, signo, value.sival_int); +#else + sdbg("TCB=0x%08x signo=%d value=%p\n", stcb, signo, sival_ptr); +#endif + if (pid == 0 || !stcb) + { + set_errno(ESRCH); + sched_unlock(); + return ERROR; + } + + /* Create the siginfo structure */ + + info.si_signo = signo; + info.si_code = SI_QUEUE; +#ifdef CONFIG_CAN_PASS_STRUCTS + info.si_value = value; +#else + info.si_value.sival_ptr = sival_ptr; +#endif + + /* Send the signal */ + + ret = sig_received(stcb, &info); + sched_unlock(); + return ret; +} + |