vfs_other.c 文件参考

浏览源代码.

函数
int	fstat (int fd, struct stat *buf)
int	fstat64 (int fd, struct stat64 *buf)
int	lstat (const char *path, struct stat *buffer)
int	VfsVnodePermissionCheck (const struct Vnode *node, int accMode)
int	VfsPermissionCheck (uint fuid, uint fgid, uint fileMode, int accMode)
static int	SetWorkDir (const char *dir, size_t len)
int	chdir (const char *path)
char *	getcwd (char *buf, size_t n)
int	chmod (const char *path, mode_t mode)
int	chown (const char *pathname, uid_t owner, gid_t group)
int	access (const char *path, int amode)
static struct dirent **	scandir_get_file_list (const char *dir, int *num, int(*filter)(const struct dirent *))
int	scandir (const char *dir, struct dirent ***namelist, int(*filter)(const struct dirent *), int(*compar)(const struct dirent **, const struct dirent **))
int	alphasort (const struct dirent **a, const struct dirent **b)
char *	rindex (const char *s, int c)
	locate character in string. 更多...
static char *	ls_get_fullpath (const char *path, struct dirent *pdirent)
static void	PrintFileInfo64 (const struct stat64 *stat64Info, const char *name)
static void	PrintFileInfo (const struct stat *statInfo, const char *name)
int	LsFile (const char *path)
int	LsDir (const char *path)
void	ls (const char *pathname)
	list directory contents. 更多...
char *	realpath (const char *path, char *resolved_path)
void	lsfd (void)
	查看FD 更多...
mode_t	GetUmask (void)
	获取用户创建文件掩码 更多...
mode_t	SysUmask (mode_t mask)
	给当前进程设置系统创建文件掩码,并返回进程旧掩码 更多...

函数说明

access()

int access	(	const char *	path,
		int	amode
	)

在文件 vfs_other.c 第 293 行定义.

{
    int ret;
    struct stat buf;
    struct statfs fsBuf;
 
    ret = statfs(path, &fsBuf);
    if (ret != 0) {
        if (get_errno() != ENOSYS) {
            return VFS_ERROR;
        }
        /* dev has no statfs ops, need devfs to handle this in feature */
    }
 
    if ((fsBuf.f_flags & MS_RDONLY) && ((unsigned int)amode & W_OK)) {
        set_errno(EROFS);
        return VFS_ERROR;
    }
 
    ret = stat(path, &buf);
    if (ret != 0) {
        return VFS_ERROR;
    }
 
    if (VfsPermissionCheck(buf.st_uid, buf.st_gid, buf.st_mode, amode)) {
        set_errno(EACCES);
        return VFS_ERROR;
    }
 
    return OK;
}

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alphasort()

int alphasort	(	const struct dirent **	a,
		const struct dirent **	b
	)

在文件 vfs_other.c 第 427 行定义.

{
    return strcoll((*a)->d_name, (*b)->d_name);
}

chdir()

int chdir

(

const char *

path

)

在文件 vfs_other.c 第 150 行定义.

{
    int ret;
    char *fullpath = NULL;
    char *fullpath_bak = NULL;
    struct stat statBuff;
 
 
    if (!path) {
        set_errno(EFAULT);
        return -1;
    }
 
    if (!strlen(path)) {
        set_errno(ENOENT);
        return -1;
    }
 
    if (strlen(path) > PATH_MAX) {
        set_errno(ENAMETOOLONG);
        return -1;
    }
 
    ret = vfs_normalize_path((const char *)NULL, path, &fullpath);
    if (ret < 0) {
        set_errno(-ret);
        return -1; /* build path failed */
    }
    fullpath_bak = fullpath;
    ret = stat(fullpath, &statBuff);
    if (ret < 0) {
        free(fullpath_bak);
        return -1;
    }
 
    if (!S_ISDIR(statBuff.st_mode)) {
        set_errno(ENOTDIR);
        free(fullpath_bak);
        return -1;
    }
 
    if (VfsPermissionCheck(statBuff.st_uid, statBuff.st_gid, statBuff.st_mode, EXEC_OP)) {
        set_errno(EACCES);
        free(fullpath_bak);
        return -1;
    }
 
#ifdef VFS_USING_WORKDIR
    ret = SetWorkDir(fullpath, strlen(fullpath));
    if (ret != 0) {
        PRINT_ERR("chdir path error!\n");
        ret = -1;
    }
#endif
 
    /* release normalize directory path name */
 
    free(fullpath_bak);
 
    return ret;
}

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chmod()

int chmod	(	const char *	path,
		mode_t	mode
	)

在文件 vfs_other.c 第 256 行定义.

{
    struct IATTR attr = {0};
    attr.attr_chg_mode = mode;
    attr.attr_chg_valid = CHG_MODE; /* change mode */
    int ret;
 
    ret = chattr(path, &attr);
    if (ret < 0) {
        return VFS_ERROR;
    }
 
    return OK;
}

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chown()

int chown	(	const char *	pathname,
		uid_t	owner,
		gid_t	group
	)

在文件 vfs_other.c 第 271 行定义.

{
    struct IATTR attr = {0};
    attr.attr_chg_valid = 0;
    int ret;
 
    if (owner != (uid_t)-1) {
        attr.attr_chg_uid = owner;
        attr.attr_chg_valid |= CHG_UID;
    }
    if (group != (gid_t)-1) {
        attr.attr_chg_gid = group;
        attr.attr_chg_valid |= CHG_GID;
    }
    ret = chattr(pathname, &attr);
    if (ret < 0) {
        return VFS_ERROR;
    }
 
    return OK;
}

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fstat()

int fstat	(	int	fd,
		struct stat *	buf
	)

在文件 vfs_other.c 第 51 行定义.

{
    struct file *filep = NULL;
 
    int ret = fs_getfilep(fd, &filep);
    if (ret < 0) {
        return VFS_ERROR;
    }
 
    return stat(filep->f_path, buf);//统计
}

fstat64()

int fstat64	(	int	fd,
		struct stat64 *	buf
	)

在文件 vfs_other.c 第 63 行定义.

{
    struct file *filep = NULL;
 
    int ret = fs_getfilep(fd, &filep);
    if (ret < 0) {
        return VFS_ERROR;
    }
 
    return stat64(filep->f_path, buf);
}

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getcwd()

char * getcwd	(	char *	buf,
		size_t	n
	)

this function is a POSIX compliant version, which will return current working directory.

参数

buf	the returned current directory.
size	the buffer size.

返回

the returned current directory.

在文件 vfs_other.c 第 222 行定义.

{
#ifdef VFS_USING_WORKDIR
    int ret;
    unsigned int len;
    UINTPTR lock_flags;
    LosProcessCB *curr = OsCurrProcessGet();
#endif
    if (buf == NULL) {
        set_errno(EINVAL);
        return buf;
    }
#ifdef VFS_USING_WORKDIR
    spin_lock_irqsave(&curr->files->workdir_lock, lock_flags);
    len = strlen(curr->files->workdir);
    if (n <= len) {
        set_errno(ERANGE);
        spin_unlock_irqrestore(&curr->files->workdir_lock, lock_flags);
        return NULL;
    }
    ret = memcpy_s(buf, n, curr->files->workdir, len + 1);
    if (ret != EOK) {
        set_errno(ENAMETOOLONG);
        spin_unlock_irqrestore(&curr->files->workdir_lock, lock_flags);
        return NULL;
    }
    spin_unlock_irqrestore(&curr->files->workdir_lock, lock_flags);
#else
    PRINT_ERR("NO_WORKING_DIR\n");
#endif
 
    return buf;
}

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GetUmask()

mode_t GetUmask

(

void

)

获取用户创建文件掩码

在文件 vfs_other.c 第 715 行定义.

{
    return OsCurrProcessGet()->umask;
}

函数调用图:

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ls()

void ls

(

const char *

pathname

)

list directory contents.

Description:

List information about the FILEs (the current directory by default).

注意

• The total length of parameter pathname must be less than the value defined by PATH_MAX.

参数

pathname

[IN] Type #const char* The file pathname.

返回值

<ul>None.</ul>

Dependency:

• fs.h: the header file that contains the API declaration.

参见

ls

在文件 vfs_other.c 第 600 行定义.

{
    struct stat statInfo = { 0 };
    char *path = NULL;
    int ret;
 
    if (pathname == NULL) {
#ifdef VFS_USING_WORKDIR
        UINTPTR lock_flags;
        LosProcessCB *curr = OsCurrProcessGet();
 
        /* open current working directory */
 
        spin_lock_irqsave(&curr->files->workdir_lock, lock_flags);
        path = strdup(curr->files->workdir);
        spin_unlock_irqrestore(&curr->files->workdir_lock, lock_flags);
#else
        path = strdup("/");
#endif
        if (path == NULL) {
            return;
        }
    } else {
        ret = vfs_normalize_path(NULL, pathname, &path);
        if (ret < 0) {
            set_errno(-ret);
            return;
        }
    }
 
    ret = stat(path, &statInfo);
    if (ret < 0) {
        perror("ls error");
        free(path);
        return;
    }
 
    if (statInfo.st_mode & S_IFDIR) { /* list all directory and file */
        ret = LsDir((pathname == NULL) ? path : pathname);
    } else { /* show the file infomation */
        ret = LsFile(path);
    }
    if (ret < 0) {
        perror("ls error");
    }
 
    free(path);
    return;
}

函数调用图:

ls_get_fullpath()

static char * ls_get_fullpath ( const char *  path, struct dirent *  pdirent  )

static

在文件 vfs_other.c 第 442 行定义.

{
    char *fullpath = NULL;
    int ret;
 
    if (path[1] != '\0') {
        /* 2, The position of the path character: / and the end character '/0' */
        fullpath = (char *)malloc(strlen(path) + strlen(pdirent->d_name) + 2);
        if (fullpath == NULL) {
            goto exit_with_nomem;
        }
 
        /* 2, The position of the path character: / and the end character '/0' */
        ret = snprintf_s(fullpath, strlen(path) + strlen(pdirent->d_name) + 2,
                         strlen(path) + strlen(pdirent->d_name) + 1, "%s/%s", path, pdirent->d_name);
        if (ret < 0) {
            free(fullpath);
            set_errno(ENAMETOOLONG);
            return NULL;
        }
    } else {
        /* 2, The position of the path character: / and the end character '/0' */
        fullpath = (char *)malloc(strlen(pdirent->d_name) + 2);
        if (fullpath == NULL) {
            goto exit_with_nomem;
        }
 
        /* 2, The position of the path character: / and the end character '/0' */
        ret = snprintf_s(fullpath, strlen(pdirent->d_name) + 2, strlen(pdirent->d_name) + 1,
                         "/%s", pdirent->d_name);
        if (ret < 0) {
            free(fullpath);
            set_errno(ENAMETOOLONG);
            return NULL;
        }
    }
    return fullpath;
 
exit_with_nomem:
    set_errno(ENOSPC);
    return (char *)NULL;
}

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LsDir()

int LsDir

(

const char *

path

)

在文件 vfs_other.c 第 553 行定义.

{
    struct stat statInfo = { 0 };
    struct stat64 stat64Info = { 0 };
    DIR *d = NULL;
    char *fullpath = NULL;
    char *fullpath_bak = NULL;
    struct dirent *pdirent = NULL;
 
    d = opendir(path);
    if (d == NULL) {
        return -1;
    }
 
    PRINTK("Directory %s:\n", path);
    do {
        pdirent = readdir(d);
        if (pdirent == NULL) {
            break;
        } else {
            if (!strcmp(pdirent->d_name, ".") || !strcmp(pdirent->d_name, "..")) {
                continue;
            }
            (void)memset_s(&statInfo, sizeof(struct stat), 0, sizeof(struct stat));
            (void)memset_s(&stat64Info, sizeof(struct stat), 0, sizeof(struct stat));
            fullpath = ls_get_fullpath(path, pdirent);
            if (fullpath == NULL) {
                (void)closedir(d);
                return -1;
            }
 
            fullpath_bak = fullpath;
            if (stat64(fullpath, &stat64Info) == 0) {
                PrintFileInfo64(&stat64Info, pdirent->d_name);
            } else if (stat(fullpath, &statInfo) == 0) {
                PrintFileInfo(&statInfo, pdirent->d_name);
            } else {
                PRINTK("BAD file: %s\n", pdirent->d_name);
            }
            free(fullpath_bak);
        }
    } while (1);
    (void)closedir(d);
 
    return 0;
}

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lsfd()

void lsfd

(

void

)

查看FD

在文件 vfs_other.c 第 689 行定义.

{
    struct filelist *f_list = NULL;
    unsigned int i = 3; /* file start fd */
    int ret;
    struct Vnode *node = NULL;
 
    f_list = &tg_filelist;
 
    PRINTK("   fd    filename\n");
    ret = sem_wait(&f_list->fl_sem);
    if (ret < 0) {
        PRINTK("sem_wait error, ret=%d\n", ret);
        return;
    }
 
    while (i < CONFIG_NFILE_DESCRIPTORS) {
        node = files_get_openfile(i);//bitmap对应位 为 1的
        if (node) {
            PRINTK("%5d   %s\n", i, f_list->fl_files[i].f_path);//打印fd 和 路径
        }
        i++;
    }
    (void)sem_post(&f_list->fl_sem);
}

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LsFile()

int LsFile

(

const char *

path

)

在文件 vfs_other.c 第 537 行定义.

{
    struct stat64 stat64Info;
    struct stat statInfo;
 
    if (stat64(path, &stat64Info) == 0) {
        PrintFileInfo64(&stat64Info, path);
    } else if (stat(path, &statInfo) == 0) {
        PrintFileInfo(&statInfo, path);
    } else {
        return -1;
    }
 
    return 0;
}

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lstat()

int lstat	(	const char *	path,
		struct stat *	buffer
	)

在文件 vfs_other.c 第 75 行定义.

{
    return stat(path, buffer);
}

PrintFileInfo()

static void PrintFileInfo ( const struct stat *  statInfo, const char *  name  )

static

在文件 vfs_other.c 第 511 行定义.

{
    mode_t mode;
    char str[UGO_NUMS][UGO_NUMS + 1] = {0};
    char dirFlag;
    int i;
 
    for (i = 0; i < UGO_NUMS; i++) {
        mode = statInfo->st_mode >> (uint)(USER_MODE_SHIFT - i * UGO_NUMS);
        str[i][0] = (mode & READ_OP) ? 'r' : '-';
        str[i][1] = (mode & WRITE_OP) ? 'w' : '-';
        str[i][UGO_NUMS - 1] = (mode & EXEC_OP) ? 'x' : '-';
    }
 
    if (S_ISDIR(statInfo->st_mode)) {
        dirFlag = 'd';
    } else if (S_ISLNK(statInfo->st_mode)) {
        dirFlag = 'l';
    } else {
        dirFlag = '-';
    }
 
    PRINTK("%c%s%s%s %-8lld u:%-5d g:%-5d %-10s\n", dirFlag,
           str[0], str[1], str[UGO_NUMS - 1], statInfo->st_size, statInfo->st_uid, statInfo->st_gid, name);
}

这是这个函数的调用关系图:

PrintFileInfo64()

static void PrintFileInfo64 ( const struct stat64 *  stat64Info, const char *  name  )

static

在文件 vfs_other.c 第 485 行定义.

{
    mode_t mode;
    char str[UGO_NUMS][UGO_NUMS + 1] = {0};
    char dirFlag;
    int i;
 
    for (i = 0; i < UGO_NUMS; i++) {
        mode = stat64Info->st_mode >> (uint)(USER_MODE_SHIFT - i * UGO_NUMS);
        str[i][0] = (mode & READ_OP) ? 'r' : '-';
        str[i][1] = (mode & WRITE_OP) ? 'w' : '-';
        str[i][UGO_NUMS - 1] = (mode & EXEC_OP) ? 'x' : '-';
    }
 
    if (S_ISDIR(stat64Info->st_mode)) {
        dirFlag = 'd';
    } else if (S_ISLNK(stat64Info->st_mode)) {
        dirFlag = 'l';
    } else {
        dirFlag = '-';
    }
 
    PRINTK("%c%s%s%s %-8lld u:%-5d g:%-5d %-10s\n", dirFlag,
           str[0], str[1], str[UGO_NUMS - 1], stat64Info->st_size, stat64Info->st_uid, stat64Info->st_gid, name);
}

这是这个函数的调用关系图:

realpath()

char * realpath	(	const char *	path,
		char *	resolved_path
	)

在文件 vfs_other.c 第 651 行定义.

{
    int ret, result;
    char *new_path = NULL;
    struct stat buf;
 
    ret = vfs_normalize_path(NULL, path, &new_path);
    if (ret < 0) {
        ret = -ret;
        set_errno(ret);
        return NULL;
    }
 
    result = stat(new_path, &buf);//获取统计信息,即属性信息
 
    if (resolved_path == NULL) {
        if (result != ENOERR) {
            free(new_path);
            return NULL;
        }
        return new_path;
    }
 
    ret = strcpy_s(resolved_path, PATH_MAX, new_path);
    if (ret != EOK) {
        ret = -ret;
        set_errno(ret);
        free(new_path);
        return NULL;
    }
 
    free(new_path);
    if (result != ENOERR) {
        return NULL;
    }
    return resolved_path;
}

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rindex()

char * rindex	(	const char *	s,
		int	c
	)

locate character in string.

Description:

The API function returns a pointer to the last occurrence of the character c in the string s.

注意

• The parameter s must point a valid string, which end with the terminating null byte.

参数

s	[IN] Type #const char* A pointer to string.
c	[IN] Type int The character.

返回值

#char*

a pointer to the matched character or NULL if the character is not found.

Dependency:

• fs.h: the header file that contains the API declaration.

参见

rindex

在文件 vfs_other.c 第 432 行定义.

{
    if (s == NULL) {
        return NULL;
    }
 
    /* Don't bother tracing - strrchr can do that */
    return (char *)strrchr(s, c);
}

scandir()

int scandir	(	const char *	dir,
		struct dirent ***	namelist,
		int(*)(const struct dirent *)	filter,
		int(*)(const struct dirent **, const struct dirent **)	compar
	)

在文件 vfs_other.c 第 391 行定义.

{
    int n = 0;
    struct dirent **list = NULL;
 
    if ((dir == NULL) || (namelist == NULL)) {
        return -1;
    }
 
    list = scandir_get_file_list(dir, &n, filter);
    if (list == NULL) {
        return -1;
    }
 
    /* Change to return to the array size */
    *namelist = (struct dirent **)malloc(n * sizeof(struct dirent *));
    if (*namelist == NULL && n > 0) {
        *namelist = list;
    } else if (*namelist != NULL) {
        (void)memcpy_s(*namelist, n * sizeof(struct dirent *), list, n * sizeof(struct dirent *));
        free(list);
    } else {
        free(list);
    }
 
    /* Sort array */
 
    if (compar && *namelist) {
        qsort((void *)*namelist, (size_t)n, sizeof(struct dirent *), (int (*)(const void *, const void *))*compar);
    }
 
    return n;
}

函数调用图:

scandir_get_file_list()

static struct dirent ** scandir_get_file_list ( const char *  dir, int *  num, int(*)(const struct dirent *)  filter  )

static

在文件 vfs_other.c 第 325 行定义.

{
    DIR *od = NULL;
    int listSize = MAX_DIR_ENT;
    int n = 0;
    struct dirent **list = NULL;
    struct dirent **newList = NULL;
    struct dirent *ent = NULL;
    struct dirent *p = NULL;
    int err;
 
    od = opendir(dir);
    if (od == NULL) {
        return NULL;
    }
 
    list = (struct dirent **)malloc(listSize * sizeof(struct dirent *));
    if (list == NULL) {
        (void)closedir(od);
        return NULL;
    }
 
    for (ent = readdir(od); ent != NULL; ent = readdir(od)) {
        if (filter && !filter(ent)) {
            continue;
        }
 
        if (n == listSize) {
            listSize += MAX_DIR_ENT;
            newList = (struct dirent **)malloc(listSize * sizeof(struct dirent *));
            if (newList == NULL) {
                break;
            }
 
            err = memcpy_s(newList, listSize * sizeof(struct dirent *), list, n * sizeof(struct dirent *));
            if (err != EOK) {
                free(newList);
                break;
            }
            free(list);
            list = newList;
        }
 
        p = (struct dirent *)malloc(sizeof(struct dirent));
        if (p == NULL) {
            break;
        }
 
        (void)memcpy_s((void *)p, sizeof(struct dirent), (void *)ent, sizeof(struct dirent));
        list[n] = p;
 
        n++;
    }
 
    if (closedir(od) < 0) {
        while (n--) {
            free(list[n]);
        }
        free(list);
        return NULL;
    }
 
    *num = n;
    return list;
}

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SetWorkDir()

static int SetWorkDir ( const char *  dir, size_t  len  )

static

在文件 vfs_other.c 第 132 行定义.

{
  errno_t ret;
  uint lock_flags;
  LosProcessCB *curr = OsCurrProcessGet();
 
  spin_lock_irqsave(&curr->files->workdir_lock, lock_flags);
  ret = strncpy_s(curr->files->workdir, PATH_MAX, dir, len);
  curr->files->workdir[PATH_MAX - 1] = '\0';
  spin_unlock_irqrestore(&curr->files->workdir_lock, lock_flags);
  if (ret != EOK) {
      return -1;
  }
 
  return 0;
}

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SysUmask()

mode_t SysUmask

(

mode_t

mask

)

给当前进程设置系统创建文件掩码,并返回进程旧掩码

在文件 vfs_other.c 第 720 行定义.

{
    UINT32 intSave;
    mode_t umask;
    mode_t oldUmask;
    umask = mask & UMASK_FULL;
    SCHEDULER_LOCK(intSave);
    oldUmask = OsCurrProcessGet()->umask;
    OsCurrProcessGet()->umask = umask;
    SCHEDULER_UNLOCK(intSave);
    return oldUmask;
}

函数调用图:

VfsPermissionCheck()

int VfsPermissionCheck	(	uint	fuid,
		uint	fgid,
		uint	fileMode,
		int	accMode
	)

在文件 vfs_other.c 第 87 行定义.

{
    uint uid = OsCurrUserGet()->effUserID;
    mode_t tmpMode = fileMode;
 
    if (uid == fuid) {
        tmpMode >>= USER_MODE_SHIFT;
    } else if (LOS_CheckInGroups(fgid)) {
        tmpMode >>= GROUP_MODE_SHIFT;
    }
 
    tmpMode &= (READ_OP | WRITE_OP | EXEC_OP);
 
    if (((uint)accMode & tmpMode) == accMode) {
        return 0;
    }
 
    tmpMode = 0;
    if (S_ISDIR(fileMode)) {
        if (IsCapPermit(CAP_DAC_EXECUTE)
            || (!((uint)accMode & WRITE_OP) && IsCapPermit(CAP_DAC_READ_SEARCH))) {
            tmpMode |= EXEC_OP;
        }
    } else {
        if (IsCapPermit(CAP_DAC_EXECUTE) && (fileMode & MODE_IXUGO)) {
            tmpMode |= EXEC_OP;
        }
    }
 
    if (IsCapPermit(CAP_DAC_WRITE)) {
        tmpMode |= WRITE_OP;
    }
 
    if (IsCapPermit(CAP_DAC_READ_SEARCH)) {
        tmpMode |= READ_OP;
    }
 
    if (((uint)accMode & tmpMode) == accMode) {
        return 0;
    }
 
    return 1;
}

函数调用图:

这是这个函数的调用关系图:

VfsVnodePermissionCheck()

int VfsVnodePermissionCheck	(	const struct Vnode *	node,
		int	accMode
	)

在文件 vfs_other.c 第 80 行定义.

{
    uint fuid = node->uid;
    uint fgid = node->gid;
    uint fileMode = node->mode;
    return VfsPermissionCheck(fuid, fgid, fileMode, accMode);
}

函数调用图:

这是这个函数的调用关系图: