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288 lines
9.1 KiB
288 lines
9.1 KiB
6 years ago
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'\" t
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.\" Title: zdir
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.\" Author: [see the "AUTHORS" section]
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.\" Generator: DocBook XSL Stylesheets v1.76.1 <http://docbook.sf.net/>
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.\" Date: 12/31/2016
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.\" Manual: CZMQ Manual
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.\" Source: CZMQ 4.0.2
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.\" Language: English
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.\"
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.TH "ZDIR" "3" "12/31/2016" "CZMQ 4\&.0\&.2" "CZMQ Manual"
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.\" -----------------------------------------------------------------
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.\" * Define some portability stuff
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.\" -----------------------------------------------------------------
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.\" http://bugs.debian.org/507673
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.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.ie \n(.g .ds Aq \(aq
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.el .ds Aq '
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.\" -----------------------------------------------------------------
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.\" * set default formatting
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.\" -----------------------------------------------------------------
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.\" disable hyphenation
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.nh
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.\" disable justification (adjust text to left margin only)
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.ad l
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.\" -----------------------------------------------------------------
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.\" * MAIN CONTENT STARTS HERE *
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.\" -----------------------------------------------------------------
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.SH "NAME"
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zdir \- work with file\-system directories
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.SH "SYNOPSIS"
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.sp
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.nf
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// This is a stable class, and may not change except for emergencies\&. It
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// is provided in stable builds\&.
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// Create a new directory item that loads in the full tree of the specified
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// path, optionally located under some parent path\&. If parent is "\-", then
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// loads only the top\-level directory, and does not use parent as a path\&.
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CZMQ_EXPORT zdir_t *
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zdir_new (const char *path, const char *parent);
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// Destroy a directory tree and all children it contains\&.
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CZMQ_EXPORT void
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zdir_destroy (zdir_t **self_p);
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// Return directory path
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CZMQ_EXPORT const char *
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zdir_path (zdir_t *self);
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// Return last modification time for directory\&.
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CZMQ_EXPORT time_t
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zdir_modified (zdir_t *self);
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// Return total hierarchy size, in bytes of data contained in all files
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// in the directory tree\&.
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CZMQ_EXPORT off_t
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zdir_cursize (zdir_t *self);
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// Return directory count
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CZMQ_EXPORT size_t
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zdir_count (zdir_t *self);
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// Returns a sorted list of zfile objects; Each entry in the list is a pointer
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// to a zfile_t item already allocated in the zdir tree\&. Do not destroy the
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// original zdir tree until you are done with this list\&.
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// Caller owns return value and must destroy it when done\&.
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CZMQ_EXPORT zlist_t *
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zdir_list (zdir_t *self);
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// Remove directory, optionally including all files that it contains, at
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// all levels\&. If force is false, will only remove the directory if empty\&.
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// If force is true, will remove all files and all subdirectories\&.
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CZMQ_EXPORT void
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zdir_remove (zdir_t *self, bool force);
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// Calculate differences between two versions of a directory tree\&.
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// Returns a list of zdir_patch_t patches\&. Either older or newer may
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// be null, indicating the directory is empty/absent\&. If alias is set,
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// generates virtual filename (minus path, plus alias)\&.
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// Caller owns return value and must destroy it when done\&.
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CZMQ_EXPORT zlist_t *
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zdir_diff (zdir_t *older, zdir_t *newer, const char *alias);
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// Return full contents of directory as a zdir_patch list\&.
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// Caller owns return value and must destroy it when done\&.
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CZMQ_EXPORT zlist_t *
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zdir_resync (zdir_t *self, const char *alias);
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// Load directory cache; returns a hash table containing the SHA\-1 digests
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// of every file in the tree\&. The cache is saved between runs in \&.cache\&.
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// Caller owns return value and must destroy it when done\&.
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CZMQ_EXPORT zhash_t *
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zdir_cache (zdir_t *self);
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// Print contents of directory to open stream
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CZMQ_EXPORT void
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zdir_fprint (zdir_t *self, FILE *file, int indent);
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// Print contents of directory to stdout
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CZMQ_EXPORT void
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zdir_print (zdir_t *self, int indent);
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// Create a new zdir_watch actor instance:
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//
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// zactor_t *watch = zactor_new (zdir_watch, NULL);
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//
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// Destroy zdir_watch instance:
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//
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// zactor_destroy (&watch);
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//
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// Enable verbose logging of commands and activity:
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//
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// zstr_send (watch, "VERBOSE");
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//
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// Subscribe to changes to a directory path:
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//
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// zsock_send (watch, "ss", "SUBSCRIBE", "directory_path");
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//
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// Unsubscribe from changes to a directory path:
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//
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// zsock_send (watch, "ss", "UNSUBSCRIBE", "directory_path");
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//
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// Receive directory changes:
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// zsock_recv (watch, "sp", &path, &patches);
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//
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// // Delete the received data\&.
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// free (path);
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// zlist_destroy (&patches);
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CZMQ_EXPORT void
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zdir_watch (zsock_t *pipe, void *unused);
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// Self test of this class\&.
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CZMQ_EXPORT void
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zdir_test (bool verbose);
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Please add \*(Aq@interface\*(Aq section in \*(Aq\&./\&.\&./src/zdir\&.c\*(Aq\&.
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.fi
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.SH "DESCRIPTION"
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.sp
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The zdir class gives access to the file system index\&. It will load a directory tree (a directory plus all child directories) into a zdir structure and then let you navigate that structure\&. It exists mainly to wrap non\-portable OS functions to do this\&.
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.sp
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Please add \fI@discuss\fR section in \fI\&./\&.\&./src/zdir\&.c\fR\&.
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.SH "EXAMPLE"
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.PP
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\fBFrom zdir_test method\fR.
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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// need to create a file in the test directory we\*(Aqre watching
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// in order to ensure the directory exists
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zfile_t *initfile = zfile_new ("\&./zdir\-test\-dir", "initial_file");
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assert (initfile);
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zfile_output (initfile);
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fprintf (zfile_handle (initfile), "initial file\en");
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zfile_close (initfile);
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zfile_destroy (&initfile);
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zdir_t *older = zdir_new ("zdir\-test\-dir", NULL);
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assert (older);
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if (verbose) {
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printf ("\en");
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zdir_dump (older, 0);
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}
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zdir_t *newer = zdir_new ("\&.", NULL);
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assert (newer);
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zlist_t *patches = zdir_diff (older, newer, "/");
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assert (patches);
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while (zlist_size (patches)) {
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zdir_patch_t *patch = (zdir_patch_t *) zlist_pop (patches);
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zdir_patch_destroy (&patch);
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}
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zlist_destroy (&patches);
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zdir_destroy (&older);
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zdir_destroy (&newer);
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zdir_t *nosuch = zdir_new ("does\-not\-exist", NULL);
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assert (nosuch == NULL);
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// zdir_watch test:
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zactor_t *watch = zactor_new (zdir_watch, NULL);
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assert (watch);
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if (verbose) {
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zsock_send (watch, "s", "VERBOSE");
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assert (zsock_wait (watch) == 0);
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}
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zclock_sleep (1001); // wait for initial file to become \*(Aqstable\*(Aq
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zsock_send (watch, "si", "TIMEOUT", 100);
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assert (zsock_wait (watch) == 0);
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zsock_send (watch, "ss", "SUBSCRIBE", "zdir\-test\-dir");
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assert (zsock_wait (watch) == 0);
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zsock_send (watch, "ss", "UNSUBSCRIBE", "zdir\-test\-dir");
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assert (zsock_wait (watch) == 0);
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zsock_send (watch, "ss", "SUBSCRIBE", "zdir\-test\-dir");
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assert (zsock_wait (watch) == 0);
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zfile_t *newfile = zfile_new ("zdir\-test\-dir", "test_abc");
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zfile_output (newfile);
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fprintf (zfile_handle (newfile), "test file\en");
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zfile_close (newfile);
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zpoller_t *watch_poll = zpoller_new (watch, NULL);
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// poll for a certain timeout before giving up and failing the test\&.
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assert (zpoller_wait (watch_poll, 1001) == watch);
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// wait for notification of the file being added
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char *path;
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int rc = zsock_recv (watch, "sp", &path, &patches);
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assert (rc == 0);
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assert (streq (path, "zdir\-test\-dir"));
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free (path);
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assert (zlist_size (patches) == 1);
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zdir_patch_t *patch = (zdir_patch_t *) zlist_pop (patches);
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assert (streq (zdir_patch_path (patch), "zdir\-test\-dir"));
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zfile_t *patch_file = zdir_patch_file (patch);
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assert (streq (zfile_filename (patch_file, ""), "zdir\-test\-dir/test_abc"));
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zdir_patch_destroy (&patch);
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zlist_destroy (&patches);
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// remove the file
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zfile_remove (newfile);
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zfile_destroy (&newfile);
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// poll for a certain timeout before giving up and failing the test\&.
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assert (zpoller_wait (watch_poll, 1001) == watch);
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// wait for notification of the file being removed
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rc = zsock_recv (watch, "sp", &path, &patches);
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assert (rc == 0);
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assert (streq (path, "zdir\-test\-dir"));
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free (path);
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assert (zlist_size (patches) == 1);
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patch = (zdir_patch_t *) zlist_pop (patches);
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assert (streq (zdir_patch_path (patch), "zdir\-test\-dir"));
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patch_file = zdir_patch_file (patch);
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assert (streq (zfile_filename (patch_file, ""), "zdir\-test\-dir/test_abc"));
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zdir_patch_destroy (&patch);
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zlist_destroy (&patches);
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zpoller_destroy (&watch_poll);
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zactor_destroy (&watch);
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// clean up by removing the test directory\&.
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zdir_t *testdir = zdir_new ("zdir\-test\-dir", NULL);
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zdir_remove (testdir, true);
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zdir_destroy (&testdir);
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.SH "AUTHORS"
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.sp
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The czmq manual was written by the authors in the AUTHORS file\&.
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.SH "RESOURCES"
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.sp
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Main web site: \m[blue]\fB\%\fR\m[]
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.sp
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Report bugs to the email <\m[blue]\fBzeromq\-dev@lists\&.zeromq\&.org\fR\m[]\&\s-2\u[1]\d\s+2>
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.SH "COPYRIGHT"
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.sp
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Copyright (c) the Contributors as noted in the AUTHORS file\&. This file is part of CZMQ, the high\-level C binding for 0MQ: http://czmq\&.zeromq\&.org\&. This Source Code Form is subject to the terms of the Mozilla Public License, v\&. 2\&.0\&. If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla\&.org/MPL/2\&.0/\&. LICENSE included with the czmq distribution\&.
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.SH "NOTES"
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.IP " 1." 4
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zeromq-dev@lists.zeromq.org
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.RS 4
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\%mailto:zeromq-dev@lists.zeromq.org
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.RE
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