syscall_pub.h 文件参考

浏览源代码.

函数
int	CheckRegion (const LosVmSpace *space, VADDR_T ptr, size_t len)
void *	DupUserMem (const void *ptr, size_t len, int needCopy)
int	GetFullpath (int fd, const char *path, char **fullpath)
int	UserPathCopy (const char *userPath, char **pathBuf)

函数说明

CheckRegion()

int CheckRegion	(	const LosVmSpace *	space,
		VADDR_T	ptr,
		size_t	len
	)

在文件 syscall_pub.c 第 33 行定义.

{
    LosVmMapRegion *region = LOS_RegionFind((LosVmSpace *)space, ptr);
    if (region == NULL) {
        return -1;
    }
    if (ptr + len <= region->range.base + region->range.size) {
        return 0;
    }
    return CheckRegion(space, region->range.base + region->range.size,
                       (ptr + len) - (region->range.base + region->range.size));
}

函数调用图:

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DupUserMem()

void * DupUserMem	(	const void *	ptr,
		size_t	len,
		int	needCopy
	)

在文件 syscall_pub.c 第 46 行定义.

{
    void *p = LOS_MemAlloc(OS_SYS_MEM_ADDR, len);
 
    if (p == NULL) {
        set_errno(ENOMEM);
        return NULL;
    }
 
    if (needCopy && LOS_ArchCopyFromUser(p, ptr, len) != 0) {
        LOS_MemFree(OS_SYS_MEM_ADDR, p);
        set_errno(EFAULT);
        return NULL;
    }
 
    return p;
}

函数调用图:

GetFullpath()

int GetFullpath	(	int	fd,
		const char *	path,
		char **	fullpath
	)

在文件 syscall_pub.c 第 64 行定义.

{
    int ret = 0;
    char *pathRet = NULL;
    struct file *file = NULL;
    struct stat bufRet = {0};
 
    if (path != NULL) {
        ret = UserPathCopy(path, &pathRet);
        if (ret != 0) {
            goto OUT;
        }
    }
 
    if ((pathRet != NULL) && (*pathRet == '/')) {
        *fullpath = pathRet;
        pathRet = NULL;
    } else {
        if (fd != AT_FDCWD) {
            /* Process fd convert to system global fd */
            fd = GetAssociatedSystemFd(fd);
        }
        ret = fs_getfilep(fd, &file);
        if (file) {
            ret = stat(file->f_path, &bufRet);
            if (!ret) {
                if (!S_ISDIR(bufRet.st_mode)) {
                    set_errno(ENOTDIR);
                    ret = -ENOTDIR;
                    goto OUT;
                }
            }
        }
        ret = vfs_normalize_pathat(fd, pathRet, fullpath);
    }
 
OUT:
    PointerFree(pathRet);
    return ret;
}

函数调用图:

这是这个函数的调用关系图:

UserPathCopy()

int UserPathCopy	(	const char *	userPath,
		char **	pathBuf
	)

在文件 syscall_pub.c 第 105 行定义.

{
    int ret;
 
    *pathBuf = (char *)LOS_MemAlloc(OS_SYS_MEM_ADDR, PATH_MAX + 1);
    if (*pathBuf == NULL) {
        return -ENOMEM;
    }
 
    ret = LOS_StrncpyFromUser(*pathBuf, userPath, PATH_MAX + 1);
    if (ret < 0) {
        (void)LOS_MemFree(OS_SYS_MEM_ADDR, *pathBuf);
        *pathBuf = NULL;
        return ret;
    } else if (ret > PATH_MAX) {
        (void)LOS_MemFree(OS_SYS_MEM_ADDR, *pathBuf);
        *pathBuf = NULL;
        return -ENAMETOOLONG;
    }
    (*pathBuf)[ret] = '\0';
 
    return 0;
}

函数调用图:

这是这个函数的调用关系图: