misc_syscall.c 文件参考

浏览源代码.

函数
int	SysUname (struct utsname *name)
int	SysInfo (struct sysinfo *info)
	系统信息 更多...
int	SysReboot (int magic, int magic2, int type)
	重启系统 更多...
int	SysShellExec (const char *msgName, const char *cmdString)
	执行 shell 命令 更多...
static void	ConvertClocks (struct timeval *time, clock_t clk)
int	SysGetrusage (int what, struct rusage *ru)
long	SysSysconf (int name)
	系统配置 更多...
int	SysUgetrlimit (int resource, unsigned long long k_rlim[2])
int	SysSetrlimit (int resource, unsigned long long k_rlim[2])

函数说明

ConvertClocks()

static void ConvertClocks ( struct timeval *  time, clock_t  clk  )

static

在文件 misc_syscall.c 第 152 行定义.

{
    time->tv_usec = (clk % CLOCKS_PER_SEC) * USEC_PER_SEC / CLOCKS_PER_SEC;
    time->tv_sec = (clk) / CLOCKS_PER_SEC;
}

函数调用图:

这是这个函数的调用关系图:

SysGetrusage()

int SysGetrusage	(	int	what,
		struct rusage *	ru
	)

在文件 misc_syscall.c 第 158 行定义.

{
    int ret;
    struct tms time;
    clock_t usec, sec;
    struct rusage kru;
 
    ret = LOS_ArchCopyFromUser(&kru, ru, sizeof(struct rusage));
    if (ret != 0) {
        return -EFAULT;
    }
 
    if (times(&time) == -1) {
        return -EFAULT;
    }
 
    switch (what) {
        case RUSAGE_SELF: {
            usec = time.tms_utime;
            sec = time.tms_stime;
            break;
        }
        case RUSAGE_CHILDREN: {
            usec = time.tms_cutime;
            sec = time.tms_cstime;
            break;
        }
        default:
            return -EINVAL;
    }
    ConvertClocks(&kru.ru_utime, usec);
    ConvertClocks(&kru.ru_stime, sec);
 
    ret = LOS_ArchCopyToUser(ru, &kru, sizeof(struct rusage));
    if (ret != 0) {
        return -EFAULT;
    }
    return 0;
}

函数调用图:

SysInfo()

int SysInfo

(

struct sysinfo *

info

)

系统信息

在文件 misc_syscall.c 第 71 行定义.

{
    int ret;
    struct sysinfo tmpInfo = { 0 };
 
    tmpInfo.totalram = LOS_MemPoolSizeGet(m_aucSysMem1);
    tmpInfo.freeram = LOS_MemPoolSizeGet(m_aucSysMem1) - LOS_MemTotalUsedGet(m_aucSysMem1);
    tmpInfo.sharedram = 0;
    tmpInfo.bufferram = 0;
    tmpInfo.totalswap = 0;
    tmpInfo.freeswap = 0;
 
    ret = LOS_ArchCopyToUser(info, &tmpInfo, sizeof(struct sysinfo));
    if (ret != 0) {
        return -EFAULT;
    }
    return 0;
}

函数调用图:

SysReboot()

int SysReboot	(	int	magic,
		int	magic2,
		int	type
	)

重启系统

在文件 misc_syscall.c 第 90 行定义.

{
    (void)magic;
    (void)magic2;
    if (!IsCapPermit(CAP_REBOOT)) {
        return -EPERM;
    }
    SystemRebootFunc rebootHook = OsGetRebootHook();
    if ((type == RB_AUTOBOOT) && (rebootHook != NULL)) {
        rebootHook();
        return 0;
    }
    return -EFAULT;
}

函数调用图:

SysSetrlimit()

int SysSetrlimit	(	int	resource,
		unsigned long long	k_rlim[2]
	)

在文件 misc_syscall.c 第 228 行定义.

{
    int ret;
    struct rlimit lim;
 
    if(!IsCapPermit(CAP_CAPSET)) {
        return -EPERM;
    }
 
    ret = LOS_ArchCopyFromUser(&lim, k_rlim, sizeof(struct rlimit));
    if (ret != 0) {
        return -EFAULT;
    }
    ret = setrlimit(resource, &lim);
 
    return ret;
}

函数调用图:

SysShellExec()

int SysShellExec	(	const char *	msgName,
		const char *	cmdString
	)

执行 shell 命令

在文件 misc_syscall.c 第 106 行定义.

{ 
    int ret;
    unsigned int uintRet;
    errno_t err;
    CmdParsed cmdParsed;
    char msgNameDup[CMD_KEY_LEN + 1] = { 0 };
    char cmdStringDup[CMD_MAX_LEN + 1] = { 0 };
 
    if (!IsCapPermit(CAP_SHELL_EXEC)) {//1.先鉴权
        return -EPERM;
    }
    //2.由内核栈空间接走用户空间的参数,注意还是同一个任务,只是从任务的用户空间移到内核栈.
    ret = LOS_StrncpyFromUser(msgNameDup, msgName, CMD_KEY_LEN + 1);
    if (ret < 0) {
        return -EFAULT;
    } else if (ret > CMD_KEY_LEN) {
        return -ENAMETOOLONG;
    }
 
    ret = LOS_StrncpyFromUser(cmdStringDup, cmdString, CMD_MAX_LEN + 1);
    if (ret < 0) {
        return -EFAULT;
    } else if (ret > CMD_MAX_LEN) {
        return -ENAMETOOLONG;
    }
 
    err = memset_s(&cmdParsed, sizeof(CmdParsed), 0, sizeof(CmdParsed));
    if (err != EOK) {
        return -EFAULT;
    }
    //获取消息类型
    uintRet = ShellMsgTypeGet(&cmdParsed, msgNameDup);
    if (uintRet != LOS_OK) {
        PRINTK("%s:command not found\n", msgNameDup);
        return -EFAULT;
    } else {
        (void)OsCmdExec(&cmdParsed, (char *)cmdStringDup);//执行shell命令,回调命令注册时的 函数指针
    }
 
    return 0;
}

函数调用图:

SysSysconf()

long SysSysconf

(

int

name

)

系统配置

在文件 misc_syscall.c 第 198 行定义.

{
    long ret;
 
    ret = sysconf(name);
    if (ret == -1) {
        return -get_errno();
    }
 
    return ret;
}

函数调用图:

SysUgetrlimit()

int SysUgetrlimit	(	int	resource,
		unsigned long long	k_rlim[2]
	)

在文件 misc_syscall.c 第 210 行定义.

{
    int ret;
    struct rlimit lim;
 
    ret = getrlimit(resource, &lim);
    if (ret < 0) {
        return ret;
    }
 
    ret = LOS_ArchCopyToUser(k_rlim, &lim, sizeof(struct rlimit));
    if (ret != 0) {
        return -EFAULT;
    }
 
    return ret;
}

函数调用图:

SysUname()

int SysUname

(

struct utsname *

name

)

在文件 misc_syscall.c 第 52 行定义.

{
    int ret;
    struct utsname tmpName;
    ret = LOS_ArchCopyFromUser(&tmpName, name, sizeof(struct utsname));
    if (ret != 0) {
        return -EFAULT;
    }
    ret = uname(&tmpName);
    if (ret < 0) {
        return ret;
    }
    ret = LOS_ArchCopyToUser(name, &tmpName, sizeof(struct utsname));
    if (ret != 0) {
        return -EFAULT;
    }
    return ret;
}

函数调用图: