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/*
* Copyright 2013 Google Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
/*
* Author: ncardwell@google.com (Neal Cardwell)
*
* Interface for a module to execute a system call from a test script.
*/
#ifndef __RUN_SYSTEM_CALL_H__
#define __RUN_SYSTEM_CALL_H__
#include "types.h"
#include <pthread.h>
#include "script.h"
struct state;
/* States in which the system call thread can be. */
enum syscall_state_t {
SYSCALL_IDLE, /* system call thread is idle */
SYSCALL_ENQUEUED, /* blocking system call is ready to execute */
SYSCALL_RUNNING, /* system call is running */
SYSCALL_DONE, /* system call is done running */
SYSCALL_EXITING, /* process is exiting */
};
/* Internal state for the system call module, including the "syscall
* thread", which handles blocking system calls.
*/
struct syscalls {
enum syscall_state_t state; /* current state of syscall thread */
struct event *event; /* current system call it's running */
s64 live_end_usecs; /* time of last system call return */
/* Handles for the syscall thread, for blocking system calls. */
pthread_t thread; /* pthread thread handle */
pid_t thread_id; /* kernel thread ID */
/* The main thread waits on this condition variable. The
* system call thread signals this when it has finished
* executing a blocking system call and is now idle and ready
* to execute another blocking system call.
*/
pthread_cond_t idle;
/* The system call thread waits on this condition
* variable. The main thread signals this when it has enqueued
* a blocking system call to execute, and thus the system call
* thread should wake up and execute that system call. The
* main thread also signals this when it's time to exit.
*/
pthread_cond_t enqueued;
/* The main thread waits on this condition variable. The
* system call thread signals this after it has dequeued the
* system call and just before it invokes the system call, at
* which point the main thread should wake up to continue test
* execution.
*/
pthread_cond_t dequeued;
};
/* Info for a nla type */
struct nla_type_info {
const char* name;
int length;
};
/* Allocate and return internal state for the system call module. */
extern struct syscalls *syscalls_new(struct state *state);
/* Tear down a syscalls and free up the resources it has allocated. */
extern void syscalls_free(struct state *state,
struct syscalls *syscalls);
/* Execute the given system call event. The system call may be
* expected to block for a while, or it may be expected to return
* immediately. To keep things simple, currently we only support
* at most one blocking system call at a time; if a script attempts to
* start a second blocking call before the first blocking call has
* returned then this second call raises a runtime error.
*/
void run_system_call_event(struct state *state,
struct event *event,
struct syscall_spec *syscall);
#endif /* __RUN_SYSTEM_CALL_H__ */
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