diff options
Diffstat (limited to 'nuttx/sched/prctl.c')
-rw-r--r-- | nuttx/sched/prctl.c | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/nuttx/sched/prctl.c b/nuttx/sched/prctl.c new file mode 100644 index 000000000..b340d0ec8 --- /dev/null +++ b/nuttx/sched/prctl.c @@ -0,0 +1,167 @@ +/************************************************************************ + * sched/prctl.c + * + * Copyright (C) 2012 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/prctl.h> +#include <stdarg.h> +#include <string.h> +#include <errno.h> +#include <debug.h> + +#include <nuttx/sched.h> + +#include "os_internal.h" + +/************************************************************************ + * Private Functions + ************************************************************************/ + +/************************************************************************ + * Public Functions + ************************************************************************/ + +/**************************************************************************** + * Name: prctl + * + * Description: + * prctl() is called with a first argument describing what to do (with + * values PR_* defined above) and with additional arguments depending on + * the specific command. + * + * Returned Value: + * The returned value may depend on the specific commnand. For PR_SET_NAME + * and PR_GET_NAME, the returned value of 0 indicates successful operation. + * On any failure, -1 is retruend and the errno value is set appropriately. + * + * EINVAL The value of 'option' is not recognized. + * EFAULT optional arg1 is not a valid address. + * ESRCH No task/thread can be found corresponding to that specified + * by optional arg1. + * + ****************************************************************************/ + +int prctl(int option, ...) +{ + va_list ap; + int err; + + va_start(ap, option); + switch (option) + { + case PR_SET_NAME: + case PR_GET_NAME: +#if CONFIG_TASK_NAME_SIZE > 0 + { + /* Get the prctl arguments */ + + char *name = va_arg(ap, char *); + int pid = va_arg(ap, int); + FAR _TCB *tcb; + + /* Get the TCB associated with the PID (handling the special case of + * pid==0 meaning "this thread") + */ + + if (!pid) + { + tcb = (FAR _TCB *)g_readytorun.head; + } + else + { + tcb = sched_gettcb(pid); + } + + /* An invalid pid will be indicated by a NULL TCB returned from + * sched_gettcb() + */ + + if (!tcb) + { + sdbg("Pid does not correspond to a task: %d\n", pid); + err = ESRCH; + goto errout; + } + + /* A pointer to the task name storage must also be provided */ + + if (!name) + { + sdbg("No name provide\n"); + err = EFAULT; + goto errout; + } + + /* Now get or set the task name */ + + if (option == PR_SET_NAME) + { + /* tcb->name may not be null-terminated */ + + strncpy(tcb->name, name, CONFIG_TASK_NAME_SIZE); + } + else + { + /* The returned value will be null-terminated, truncating if necessary */ + + strncpy(name, tcb->name, CONFIG_TASK_NAME_SIZE-1); + name[CONFIG_TASK_NAME_SIZE-1] = '\0'; + } + } + break; +#else + sdbg("Option not enabled: %d\n", option); + err = ENOSYS; + goto errout; +#endif + + default: + sdbg("Unrecognized option: %d\n", option); + err = EINVAL; + goto errout; + } + + va_end(ap); + return OK; + +errout: + va_end(ap); + set_errno(err); + return ERROR; +} |