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Diffstat (limited to 'nuttx/sched/sig_kill.c')
-rw-r--r-- | nuttx/sched/sig_kill.c | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/nuttx/sched/sig_kill.c b/nuttx/sched/sig_kill.c new file mode 100644 index 000000000..17921015f --- /dev/null +++ b/nuttx/sched/sig_kill.c @@ -0,0 +1,135 @@ +/************************************************************************ + * sched/sig_kill.c + * + * Copyright (C) 2007, 2009, 2011 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 <sys/types.h> +#include <sched.h> +#include <errno.h> +#include <debug.h> + +#include "os_internal.h" +#include "sig_internal.h" + +/************************************************************************ + * Global Functions + ************************************************************************/ + +/************************************************************************ + * Name: 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. If signo is zero, no signal is + * sent, but all error checking is performed. + * + * Returned 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) + { + errno = ENOSYS; + return ERROR; + } + + /* Make sure that the signal is valid */ + + if (!GOOD_SIGNO(signo)) + { + errno = EINVAL; + return ERROR; + } + + /* Keep things stationary through the following */ + + sched_lock(); + + /* Get the TCB of the receiving task */ + + stcb = sched_gettcb(pid); + sdbg("TCB=0x%08x signo=%d\n", stcb, signo); + if (!stcb) + { + errno = 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; +} + + |