disk IO convenience methods More...

#include "platform.h"
#include "gnunet_util_lib.h"
#include <sys/types.h>

Include dependency graph for disk.c:

Data Structures
struct	GNUNET_DISK_PipeHandle
	Handle used to manage a pipe. More...

struct	GetFileSizeData
	Closure for the recursion to determine the file size of a directory. More...

struct	GlobClosure

struct	GNUNET_DISK_MapHandle
	Handle for a memory-mapping operation. More...

Macros
#define	LOG(kind, ...) GNUNET_log_from (kind, "util-disk", __VA_ARGS__)

#define	LOG_STRERROR(kind, syscall) GNUNET_log_from_strerror (kind, "util-disk", syscall)

#define	LOG_STRERROR_FILE(kind, syscall, filename) GNUNET_log_from_strerror_file (kind, "util-disk", syscall, filename)

#define	COPY_BLK_SIZE 65536
	Block size for IO for copying files. More...

#define	_IFMT 0170000 /* type of file */

#define	_IFLNK 0120000 /* symbolic link */

#define	S_ISLNK(m) (((m) & _IFMT) == _IFLNK)

#define	MAP_FAILED ((void *) -1)

Functions
static int	translate_unix_perms (enum GNUNET_DISK_AccessPermissions perm)
	Translate GNUnet-internal permission bitmap to UNIX file access permission bitmap. More...

static enum GNUNET_GenericReturnValue	get_size_rec (void cls, const char fn)
	Iterate over all files in the given directory and accumulate their size. More...

enum GNUNET_GenericReturnValue	GNUNET_DISK_handle_invalid (const struct GNUNET_DISK_FileHandle *h)
	Checks whether a handle is invalid. More...

enum GNUNET_GenericReturnValue	GNUNET_DISK_file_handle_size (struct GNUNET_DISK_FileHandle fh, off_t size)
	Get the size of an open file. More...

off_t	GNUNET_DISK_file_seek (const struct GNUNET_DISK_FileHandle *h, off_t offset, enum GNUNET_DISK_Seek whence)
	Move the read/write pointer in a file. More...

enum GNUNET_GenericReturnValue	GNUNET_DISK_file_size (const char filename, uint64_t size, int include_symbolic_links, int single_file_mode)
	Get the size of the file (or directory) of the given file (in bytes). More...

enum GNUNET_GenericReturnValue	GNUNET_DISK_file_get_identifiers (const char filename, uint64_t dev, uint64_t *ino)
	Obtain some unique identifiers for the given file that can be used to identify it in the local system. More...

static char *	mktemp_name (const char *t)
	Create the name for a temporary file or directory from a template. More...

void	GNUNET_DISK_fix_permissions (const char *fn, int require_uid_match, int require_gid_match)
	Update POSIX permissions mask of a file on disk. More...

char *	GNUNET_DISK_mkdtemp (const char *t)
	Create an (empty) temporary directory on disk. More...

void	GNUNET_DISK_file_backup (const char *fil)
	Move a file out of the way (create a backup) by renaming it to "orig.NUM~" where NUM is the smallest number that is not used yet. More...

char *	GNUNET_DISK_mktemp (const char *t)
	Create an (empty) temporary file on disk. More...

enum GNUNET_GenericReturnValue	GNUNET_DISK_directory_test (const char *fil, int is_readable)
	Test if fil is a directory and listable. More...

static enum GNUNET_GenericReturnValue	file_test_internal (const char *fil, int amode)
	Check if fil can be accessed using amode. More...

enum GNUNET_GenericReturnValue	GNUNET_DISK_file_test (const char *fil)
	Check that fil corresponds to a filename (of a file that exists and that is not a directory). More...

enum GNUNET_GenericReturnValue	GNUNET_DISK_file_test_read (const char *fil)
	Check that fil corresponds to a filename and the file has read permissions. More...

enum GNUNET_GenericReturnValue	GNUNET_DISK_directory_create (const char *dir)
	Implementation of "mkdir -p". More...

enum GNUNET_GenericReturnValue	GNUNET_DISK_directory_create_for_file (const char *filename)
	Create the directory structure for storing a file. More...

ssize_t	GNUNET_DISK_file_read (const struct GNUNET_DISK_FileHandle h, void result, size_t len)
	Read the contents of a binary file into a buffer. More...

ssize_t	GNUNET_DISK_file_read_non_blocking (const struct GNUNET_DISK_FileHandle h, void result, size_t len)
	Read the contents of a binary file into a buffer. More...

ssize_t	GNUNET_DISK_fn_read (const char fn, void result, size_t len)
	Read the contents of a binary file into a buffer. More...

ssize_t	GNUNET_DISK_file_write (const struct GNUNET_DISK_FileHandle h, const void buffer, size_t n)
	Write a buffer to a file. More...

ssize_t	GNUNET_DISK_file_write_blocking (const struct GNUNET_DISK_FileHandle h, const void buffer, size_t n)
	Write a buffer to a file, blocking, if necessary. More...

enum GNUNET_GenericReturnValue	GNUNET_DISK_fn_write (const char fn, const void buf, size_t buf_size, enum GNUNET_DISK_AccessPermissions mode)
	Write a buffer to a file atomically. More...

int	GNUNET_DISK_directory_scan (const char dir_name, GNUNET_FileNameCallback callback, void callback_cls)
	Scan a directory for files. More...

static bool	glob_match (const char pattern, const char str)
	Check for a simple wildcard match. More...

static enum GNUNET_GenericReturnValue	glob_cb (void cls, const char filename)
	Function called with a filename. More...

int	GNUNET_DISK_glob (const char glob_pattern, GNUNET_FileNameCallback callback, void callback_cls)
	Find all files matching a glob pattern. More...

static enum GNUNET_GenericReturnValue	remove_helper (void unused, const char fn)
	Function that removes the given directory by calling GNUNET_DISK_directory_remove(). More...

enum GNUNET_GenericReturnValue	GNUNET_DISK_directory_remove (const char *filename)
	Remove all files in a directory (rm -rf). More...

enum GNUNET_GenericReturnValue	GNUNET_DISK_file_copy (const char src, const char dst)
	Copy a file. More...

void	GNUNET_DISK_filename_canonicalize (char *fn)
	Removes special characters as ':' from a filename. More...

enum GNUNET_GenericReturnValue	GNUNET_DISK_file_change_owner (const char filename, const char user)
	Change owner of a file. More...

struct GNUNET_DISK_FileHandle *	GNUNET_DISK_file_open (const char *fn, enum GNUNET_DISK_OpenFlags flags, enum GNUNET_DISK_AccessPermissions perm)
	Open a file. More...

enum GNUNET_GenericReturnValue	GNUNET_DISK_file_close (struct GNUNET_DISK_FileHandle *h)
	Close an open file. More...

struct GNUNET_DISK_FileHandle *	GNUNET_DISK_get_handle_from_int_fd (int fno)
	Get a handle from a native integer FD. More...

struct GNUNET_DISK_FileHandle *	GNUNET_DISK_get_handle_from_native (FILE *fd)
	Get a handle from a native FD. More...

void *	GNUNET_DISK_file_map (const struct GNUNET_DISK_FileHandle h, struct GNUNET_DISK_MapHandle *m, enum GNUNET_DISK_MapType access, size_t len)
	Map a file into memory. More...

enum GNUNET_GenericReturnValue	GNUNET_DISK_file_unmap (struct GNUNET_DISK_MapHandle *h)
	Unmap a file. More...

enum GNUNET_GenericReturnValue	GNUNET_DISK_file_sync (const struct GNUNET_DISK_FileHandle *h)
	Write file changes to disk. More...

struct GNUNET_DISK_PipeHandle *	GNUNET_DISK_pipe (enum GNUNET_DISK_PipeFlags pf)
	Creates an interprocess channel. More...

struct GNUNET_DISK_PipeHandle *	GNUNET_DISK_pipe_from_fd (enum GNUNET_DISK_PipeFlags pf, int fd[2])
	Creates a pipe object from a couple of file descriptors. More...

enum GNUNET_GenericReturnValue	GNUNET_DISK_pipe_close_end (struct GNUNET_DISK_PipeHandle *p, enum GNUNET_DISK_PipeEnd end)
	Closes one half of an interprocess channel. More...

struct GNUNET_DISK_FileHandle *	GNUNET_DISK_pipe_detach_end (struct GNUNET_DISK_PipeHandle *p, enum GNUNET_DISK_PipeEnd end)
	Detaches one of the ends from the pipe. More...

enum GNUNET_GenericReturnValue	GNUNET_DISK_pipe_close (struct GNUNET_DISK_PipeHandle *p)
	Closes an interprocess channel. More...

const struct GNUNET_DISK_FileHandle *	GNUNET_DISK_pipe_handle (const struct GNUNET_DISK_PipeHandle *p, enum GNUNET_DISK_PipeEnd n)
	Get the handle to a particular pipe end. More...

enum GNUNET_GenericReturnValue	GNUNET_DISK_internal_file_handle_ (const struct GNUNET_DISK_FileHandle fh, void dst, size_t dst_len)
	Retrieve OS file handle. More...

static enum GNUNET_GenericReturnValue	purge_cfg_dir (void cls, const struct GNUNET_CONFIGURATION_Handle cfg)
	Helper function for GNUNET_DISK_purge_cfg_dir. More...

void	GNUNET_DISK_purge_cfg_dir (const char cfg_filename, const char option)
	Remove the directory given under option in section [PATHS] in configuration under cfg_filename. More...

Detailed Description

disk IO convenience methods

Author: Christian Grothoff; Nils Durner

Definition in file disk.c.

Macro Definition Documentation

◆ LOG

#define LOG	(	kind,
		...
	)	GNUNET_log_from (kind, "util-disk", __VA_ARGS__)

Definition at line 30 of file disk.c.

◆ LOG_STRERROR

#define LOG_STRERROR	(	kind,
		syscall
	)	GNUNET_log_from_strerror (kind, "util-disk", syscall)

Definition at line 32 of file disk.c.

◆ LOG_STRERROR_FILE

#define LOG_STRERROR_FILE	(	kind,
		syscall,
		filename
	)	GNUNET_log_from_strerror_file (kind, "util-disk", syscall, filename)

Definition at line 35 of file disk.c.

◆ COPY_BLK_SIZE

#define COPY_BLK_SIZE 65536

Block size for IO for copying files.

Definition at line 41 of file disk.c.

◆ _IFMT

#define _IFMT 0170000 /* type of file */

Definition at line 58 of file disk.c.

◆ _IFLNK

#define _IFLNK 0120000 /* symbolic link */

Definition at line 59 of file disk.c.

◆ S_ISLNK

#define S_ISLNK ( m ) (((m) & _IFMT) == _IFLNK)

Definition at line 60 of file disk.c.

◆ MAP_FAILED

#define MAP_FAILED ((void *) -1)

Definition at line 1375 of file disk.c.

Function Documentation

◆ translate_unix_perms()

static int translate_unix_perms ( enum GNUNET_DISK_AccessPermissions perm )

static

Translate GNUnet-internal permission bitmap to UNIX file access permission bitmap.

Parameters

perm	file permissions, GNUnet style

Returns: file permissions, UNIX style

Definition at line 108 of file disk.c.

 {
   int mode;
  
   mode = 0;
   if (perm & GNUNET_DISK_PERM_USER_READ)
     mode |= S_IRUSR;
   if (perm & GNUNET_DISK_PERM_USER_WRITE)
     mode |= S_IWUSR;
   if (perm & GNUNET_DISK_PERM_USER_EXEC)
     mode |= S_IXUSR;
   if (perm & GNUNET_DISK_PERM_GROUP_READ)
     mode |= S_IRGRP;
   if (perm & GNUNET_DISK_PERM_GROUP_WRITE)
     mode |= S_IWGRP;
   if (perm & GNUNET_DISK_PERM_GROUP_EXEC)
     mode |= S_IXGRP;
   if (perm & GNUNET_DISK_PERM_OTHER_READ)
     mode |= S_IROTH;
   if (perm & GNUNET_DISK_PERM_OTHER_WRITE)
     mode |= S_IWOTH;
   if (perm & GNUNET_DISK_PERM_OTHER_EXEC)
     mode |= S_IXOTH;
  
   return mode;
 }

Referenced by GNUNET_DISK_file_close().

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◆ get_size_rec()

static enum GNUNET_GenericReturnValue get_size_rec	(	void *	cls,
		const char *	fn
	)

static

Iterate over all files in the given directory and accumulate their size.

Parameters

cls	closure of type `struct GetFileSizeData`
fn	current filename we are looking at

Returns: GNUNET_SYSERR on serious errors, otherwise GNUNET_OK

Definition at line 108 of file disk.c.

 {
   struct GetFileSizeData *gfsd = cls;
  
 #if defined(HAVE_STAT64) && \
   ! (defined(_FILE_OFFSET_BITS) && _FILE_OFFSET_BITS == 64)
   struct stat64 buf;
  
   if (0 != stat64 (fn, &buf))
   {
     LOG_STRERROR_FILE (GNUNET_ERROR_TYPE_DEBUG, "stat64", fn);
     return GNUNET_SYSERR;
   }
 #else
   struct stat buf;
  
   if (0 != stat (fn, &buf))
   {
     LOG_STRERROR_FILE (GNUNET_ERROR_TYPE_DEBUG, "stat", fn);
     return GNUNET_SYSERR;
   }
 #endif
   if ((S_ISDIR (buf.st_mode)) && (gfsd->single_file_mode == GNUNET_YES))
   {
     errno = EISDIR;
     return GNUNET_SYSERR;
   }
   if ((! S_ISLNK (buf.st_mode)) || (gfsd->include_sym_links == GNUNET_YES))
     gfsd->total += buf.st_size;
   if ((S_ISDIR (buf.st_mode)) && (0 == access (fn, X_OK)) &&
       ((! S_ISLNK (buf.st_mode)) || (gfsd->include_sym_links == GNUNET_YES)))
   {
     if (GNUNET_SYSERR == GNUNET_DISK_directory_scan (fn, &get_size_rec, gfsd))
       return GNUNET_SYSERR;
   }
   return GNUNET_OK;
 }

◆ mktemp_name()

static char* mktemp_name ( const char * t )

static

Create the name for a temporary file or directory from a template.

Parameters

t	template (without XXXXX or "/tmp/")

Returns: name ready for passing to 'mktemp' or 'mkdtemp', NULL on error

Definition at line 292 of file disk.c.

 {
   const char *tmpdir;
   char *tmpl;
   char *fn;
  
   if ((t[0] != '/') && (t[0] != '\\'))
   {
     /* FIXME: This uses system codepage on W32, not UTF-8 */
     tmpdir = getenv ("TMPDIR");
     if (NULL == tmpdir)
       tmpdir = getenv ("TMP");
     if (NULL == tmpdir)
       tmpdir = getenv ("TEMP");
     if (NULL == tmpdir)
       tmpdir = "/tmp";
     GNUNET_asprintf (&tmpl, "%s/%s%s", tmpdir, t, "XXXXXX");
   }
   else
   {
     GNUNET_asprintf (&tmpl, "%s%s", t, "XXXXXX");
   }
   fn = tmpl;
   return fn;
 }

References getenv(), GNUNET_asprintf(), and t.

Referenced by GNUNET_DISK_directory_create(), and GNUNET_DISK_mkdtemp().

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◆ file_test_internal()

static enum GNUNET_GenericReturnValue file_test_internal	(	const char *	fil,
		int	amode
	)

static

Check if fil can be accessed using amode.

Parameters

fil	file to check for
amode	access mode

Returns: GNUnet error code

Definition at line 380 of file disk.c.

 {
   struct stat filestat;
   int ret;
   char *rdir;
  
   rdir = GNUNET_STRINGS_filename_expand (fil);
   if (rdir == NULL)
     return GNUNET_SYSERR;
  
   ret = stat (rdir, &filestat);
   if (0 != ret)
   {
     if (errno != ENOENT)
     {
       LOG_STRERROR_FILE (GNUNET_ERROR_TYPE_DEBUG, "stat", rdir);
       GNUNET_free (rdir);
       return GNUNET_SYSERR;
     }
     GNUNET_free (rdir);
     return GNUNET_NO;
   }
   if (! S_ISREG (filestat.st_mode))
   {
     GNUNET_free (rdir);
     return GNUNET_NO;
   }
   if (access (rdir, amode) < 0)
   {
     LOG_STRERROR_FILE (GNUNET_ERROR_TYPE_DEBUG, "access", rdir);
     GNUNET_free (rdir);
     return GNUNET_SYSERR;
   }
   GNUNET_free (rdir);
   return GNUNET_YES;
 }

◆ glob_match()

static bool glob_match	(	const char *	pattern,
		const char *	str
	)

static

Check for a simple wildcard match.

Only asterisks are allowed. Asterisks match everything, including slashes.

Parameters

pattern	pattern with wildcards
str	string to match against

Returns: true on match, false otherwise

Definition at line 916 of file disk.c.

 {
   /* Position in the input string */
   const char *str_pos = str;
   /* Position in the pattern */
   const char *pat_pos = pattern;
   /* Backtrack position in string */
   const char *str_bt = NULL;
   /* Backtrack position in pattern */
   const char *pat_bt = NULL;
  
   for (;;)
   {
     if (*pat_pos == '*')
     {
       str_bt = str_pos;
       pat_bt = pat_pos++;
     }
     else if (*pat_pos == *str_pos)
     {
       if ('\0' == *pat_pos)
         return true;
       str_pos++;
       pat_pos++;
     }
     else
     {
       if (NULL == str_bt)
         return false;
       /* Backtrack to match one more
          character as part of the asterisk. */
       str_pos = str_bt + 1;
       if ('\0' == *str_pos)
         return false;
       pat_pos = pat_bt;
     }
   }
 }

◆ glob_cb()

static enum GNUNET_GenericReturnValue glob_cb	(	void *	cls,
		const char *	filename
	)

static

Function called with a filename.

Parameters

cls	closure
filename	complete filename (absolute path)

Returns: GNUNET_OK to continue to iterate, GNUNET_NO to stop iteration with no error, GNUNET_SYSERR to abort iteration with error!

Definition at line 916 of file disk.c.

 {
   struct GlobClosure *gc = cls;
   const char *fn;
  
   fn = strrchr (filename, DIR_SEPARATOR);
   fn = (NULL == fn) ? filename : (fn + 1);
  
   LOG (GNUNET_ERROR_TYPE_DEBUG,
        "checking glob '%s' against '%s'\n",
        gc->glob,
        fn);
  
   if (glob_match (gc->glob, fn))
   {
     enum GNUNET_GenericReturnValue cbret;
  
     LOG (GNUNET_ERROR_TYPE_DEBUG,
          "found glob match '%s'\n",
          filename);
     gc->nres++;
     cbret = gc->cb (gc->cls, filename);
     if (GNUNET_OK != cbret)
       return cbret;
   }
   return GNUNET_OK;
 }

Referenced by GNUNET_DISK_directory_remove().

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◆ remove_helper()

static enum GNUNET_GenericReturnValue remove_helper	(	void *	unused,
		const char *	fn
	)

static

Function that removes the given directory by calling GNUNET_DISK_directory_remove().

Parameters

unused	not used
fn	directory to remove

Returns: GNUNET_OK

Definition at line 1009 of file disk.c.

 {
   (void) unused;
   (void) GNUNET_DISK_directory_remove (fn);
   return GNUNET_OK;
 }

◆ GNUNET_DISK_internal_file_handle_()

enum GNUNET_GenericReturnValue GNUNET_DISK_internal_file_handle_	(	const struct GNUNET_DISK_FileHandle *	fh,
		void *	dst,
		size_t	dst_len
	)

Retrieve OS file handle.

Parameters

fh	GNUnet file descriptor
dst	destination buffer
dst_len	length of dst

Returns: GNUNET_OK on success, GNUNET_SYSERR otherwise

Definition at line 1617 of file disk.c.

 {
   if (NULL == fh)
     return GNUNET_SYSERR;
   if (dst_len < sizeof(int))
     return GNUNET_SYSERR;
   *((int *) dst) = fh->fd;
   return GNUNET_OK;
 }

References GNUNET_break, GNUNET_DISK_PIPE_END_READ, GNUNET_DISK_PIPE_END_WRITE, and p.

Referenced by GNUNET_NETWORK_fdset_handle_set(), and start_process().

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◆ purge_cfg_dir()

static enum GNUNET_GenericReturnValue purge_cfg_dir	(	void *	cls,
		const struct GNUNET_CONFIGURATION_Handle *	cfg
	)

static

Helper function for GNUNET_DISK_purge_cfg_dir.

Parameters

cls	a `const char *` with the option to purge
cfg	our configuration

Returns: GNUNET_OK on success

Definition at line 1617 of file disk.c.

 {
   const char *option = cls;
   char *tmpname;
  
   if (GNUNET_OK !=
       GNUNET_CONFIGURATION_get_value_filename (cfg, "PATHS", option, &tmpname))
   {
     GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, "PATHS", option);
     return GNUNET_NO;
   }
   if (GNUNET_SYSERR == GNUNET_DISK_directory_remove (tmpname))
   {
     GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR, "remove", tmpname);
     GNUNET_free (tmpname);
     return GNUNET_OK;
   }
   GNUNET_free (tmpname);
   return GNUNET_OK;
 }

Referenced by GNUNET_DISK_purge_cfg_dir().

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Data Structures

Macros

Functions

Detailed Description

Macro Definition Documentation

◆ LOG

◆ LOG_STRERROR

◆ LOG_STRERROR_FILE

◆ COPY_BLK_SIZE

◆ _IFMT

◆ _IFLNK

◆ S_ISLNK

◆ MAP_FAILED

Function Documentation

◆ translate_unix_perms()

◆ get_size_rec()

◆ mktemp_name()

◆ file_test_internal()

◆ glob_match()

◆ glob_cb()

◆ remove_helper()

◆ GNUNET_DISK_internal_file_handle_()

◆ purge_cfg_dir()