author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Wed, 15 Sep 2010 14:02:55 +0300 | |
branch | RCL_3 |
changeset 64 | c44f36bb61a3 |
parent 0 | e4d67989cc36 |
permissions | -rw-r--r-- |
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/** @file ../include/ftw.h |
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@internalComponent |
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*/ |
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/** @fn ftw(const char *path, int (*fn)(const char *, const struct stat *, int), int nfds) |
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@param path |
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@param fn |
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@param nfds |
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@return If the tree is exhausted, ftw() shall return 0. |
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If the function pointed to by fn returns a non-zero value, ftw() shall stop its tree traversal and |
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return whatever value was returned by the function pointed to by fn. |
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If ftw() detects an error, it shall return -1 and set errno to indicate the error. |
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The ftw() function shall recursively descend the directory hierarchy rooted in path. |
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For each object in the hierarchy, ftw() shall call the function pointed to by fn, |
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passing it a pointer to a null-terminated character string containing the name of the object, |
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a pointer to a stat structure containing information about the object, and an integer.Possible values of the integer are: |
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FTW_D |
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For a directory. |
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FTW_DNR |
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For a directory that cannot be read. |
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FTW_F |
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For a file. |
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FTW_SL |
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For a symbolic link (but see also FTW_NS below). |
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FTW_NS |
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For an object other than a symbolic link on which stat() could not successfully be executed. |
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If the object is a symbolic link and stat() failed, |
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it is unspecified whether ftw() passes FTW_SL or FTW_NS to the user-supplied function. |
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The argument nfds should be in the range [1, {OPEN_MAX}]. |
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Errors: |
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[EACCES] |
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Search permission is denied for any component of path or read permission is denied for path. |
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[ELOOP] |
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A loop exists in symbolic links encountered during resolution of the path argument. |
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[ENAMETOOLONG] |
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The length of the path argument exceeds {PATH_MAX} or a pathname component is longer than {NAME_MAX}. |
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[ENOENT] |
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A component of path does not name an existing file or path is an empty string. |
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[ENOTDIR] |
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A component of path is not a directory. |
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[EOVERFLOW] |
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A field in the stat structure cannot be represented correctly in the current programming environment |
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for one or more files found in the file hierarchy. |
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Examples: |
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@code |
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/* Detailed description: Sample usage of ftw system call |
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* Preconditions: Function fn with the specified prototype should be defined and |
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* should have atleast two objects in the current working directory. |
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*/ |
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#include <ftw.h> |
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#include <stdlib.h> |
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#include <stdio.h> |
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if (ftw(".", fn, 2) != 0) { |
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perror("ftw"); exit(2); |
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} |
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else |
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{ |
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printf("ftw call succeded"); |
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} |
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@endcode |
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Output |
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@code |
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ftw call succeded |
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@endcode |
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@see stat() |
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@capability Deferred @ref RFs::Entry(const TDesC16&, TEntry&) |
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@publishedAll |
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@externallyDefinedApi |
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*/ |
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/** @fn ftw64(const char *path, int (*fn)(const char *, const struct stat64 *, int), int nfds) |
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@param path |
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@param fn |
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@param nfds |
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@return If the tree is exhausted, ftw64() shall return 0. |
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If the function pointed to by fn returns a non-zero value, ftw64() shall stop its tree traversal and |
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return whatever value was returned by the function pointed to by fn. |
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If ftw64() detects an error, it shall return -1 and set errno to indicate the error. |
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For full documentation see: http://www.unix.org/version2/whatsnew/lfs20mar.html#3.0 |
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@see ftw() |
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@publishedAll |
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@externallyDefinedApi |
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*/ |
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/** @def FTW_F |
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Regular File. Valid flags for the 3rd argument to the function that is passed as the second argument to ftw(3) and nftw(3). |
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@publishedAll |
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@externallyDefinedApi |
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*/ |
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/** @def FTW_D |
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Valid flags for the 3rd argument to the function that is passed as the second argument to ftw(3) and nftw(3). |
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Directory. |
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@publishedAll |
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@externallyDefinedApi |
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*/ |
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/** @def FTW_DNR |
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Directory without read permission. |
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@publishedAll |
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@externallyDefinedApi |
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*/ |
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/** @def FTW_DP |
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Directory with subdirectories visited. A file on which stat could not successfully be |
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executed. |
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@publishedAll |
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@externallyDefinedApi |
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*/ |
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/** @def FTW_NS |
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A file on which stat could not successfully be executed. |
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@publishedAll |
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@externallyDefinedApi |
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*/ |
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/** @def FTW_SL |
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Symbolic link. |
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@publishedAll |
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@externallyDefinedApi |
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*/ |
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/** @def FTW_SLN |
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Sym link that names a nonexistent file. |
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@publishedAll |
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@externallyDefinedApi |
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*/ |
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/** @def FTW_PHYS |
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Flags for use as the 4th argument to nftw(3). These may be ORed together. |
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Physical walk, don't follow sym links. |
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@publishedAll |
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@released |
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*/ |
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/** @def FTW_MOUNT |
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The walk does not cross a mount point. |
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@publishedAll |
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@released |
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*/ |
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/** @def FTW_DEPTH |
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Subdirs visited before the dir itself. |
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@publishedAll |
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@released |
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*/ |
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/** @def FTW_CHDIR |
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Change to a directory before reading it. |
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@publishedAll |
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@released |
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*/ |
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