1ZSYS(3)                           CZMQ Manual                          ZSYS(3)
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NAME

6       zsys - Class for system-level methods
7

SYNOPSIS

9       //  This is a stable class, and may not change except for emergencies. It
10       //  is provided in stable builds.
11       //  This class has draft methods, which may change over time. They are not
12       //  in stable releases, by default. Use --enable-drafts to enable.
13       // Callback for interrupt signal handler
14       typedef void (zsys_handler_fn) (
15           int signal_value);
16
17       //  Initialize CZMQ zsys layer; this happens automatically when you create
18       //  a socket or an actor; however this call lets you force initialization
19       //  earlier, so e.g. logging is properly set-up before you start working.
20       //  Not threadsafe, so call only from main thread. Safe to call multiple
21       //  times. Returns global CZMQ context.
22       CZMQ_EXPORT void *
23           zsys_init (void);
24
25       //  Optionally shut down the CZMQ zsys layer; this normally happens automatically
26       //  when the process exits; however this call lets you force a shutdown
27       //  earlier, avoiding any potential problems with atexit() ordering, especially
28       //  with Windows dlls.
29       CZMQ_EXPORT void
30           zsys_shutdown (void);
31
32       //  Get a new ZMQ socket, automagically creating a ZMQ context if this is
33       //  the first time. Caller is responsible for destroying the ZMQ socket
34       //  before process exits, to avoid a ZMQ deadlock. Note: you should not use
35       //  this method in CZMQ apps, use zsock_new() instead.
36       //  *** This is for CZMQ internal use only and may change arbitrarily ***
37       CZMQ_EXPORT void *
38           zsys_socket (int type, const char *filename, size_t line_nbr);
39
40       //  Destroy/close a ZMQ socket. You should call this for every socket you
41       //  create using zsys_socket().
42       //  *** This is for CZMQ internal use only and may change arbitrarily ***
43       CZMQ_EXPORT int
44           zsys_close (void *handle, const char *filename, size_t line_nbr);
45
46       //  Return ZMQ socket name for socket type
47       //  *** This is for CZMQ internal use only and may change arbitrarily ***
48       CZMQ_EXPORT char *
49           zsys_sockname (int socktype);
50
51       //  Create a pipe, which consists of two PAIR sockets connected over inproc.
52       //  The pipe is configured to use the zsys_pipehwm setting. Returns the
53       //  frontend socket successful, NULL if failed.
54       CZMQ_EXPORT zsock_t *
55           zsys_create_pipe (zsock_t **backend_p);
56
57       //  Set interrupt handler; this saves the default handlers so that a
58       //  zsys_handler_reset () can restore them. If you call this multiple times
59       //  then the last handler will take affect. If handler_fn is NULL, disables
60       //  default SIGINT/SIGTERM handling in CZMQ.
61       CZMQ_EXPORT void
62           zsys_handler_set (zsys_handler_fn *handler_fn);
63
64       //  Reset interrupt handler, call this at exit if needed
65       CZMQ_EXPORT void
66           zsys_handler_reset (void);
67
68       //  Set default interrupt handler, so Ctrl-C or SIGTERM will set
69       //  zsys_interrupted. Idempotent; safe to call multiple times.
70       //  Can be supressed by ZSYS_SIGHANDLER=false
71       //  *** This is for CZMQ internal use only and may change arbitrarily ***
72       CZMQ_EXPORT void
73           zsys_catch_interrupts (void);
74
75       //  Return 1 if file exists, else zero
76       CZMQ_EXPORT bool
77           zsys_file_exists (const char *filename);
78
79       //  Return file modification time. Returns 0 if the file does not exist.
80       CZMQ_EXPORT time_t
81           zsys_file_modified (const char *filename);
82
83       //  Return file mode; provides at least support for the POSIX S_ISREG(m)
84       //  and S_ISDIR(m) macros and the S_IRUSR and S_IWUSR bits, on all boxes.
85       //  Returns a mode_t cast to int, or -1 in case of error.
86       CZMQ_EXPORT int
87           zsys_file_mode (const char *filename);
88
89       //  Delete file. Does not complain if the file is absent
90       CZMQ_EXPORT int
91           zsys_file_delete (const char *filename);
92
93       //  Check if file is 'stable'
94       CZMQ_EXPORT bool
95           zsys_file_stable (const char *filename);
96
97       //  Create a file path if it doesn't exist. The file path is treated as
98       //  printf format.
99       CZMQ_EXPORT int
100           zsys_dir_create (const char *pathname, ...);
101
102       //  Remove a file path if empty; the pathname is treated as printf format.
103       CZMQ_EXPORT int
104           zsys_dir_delete (const char *pathname, ...);
105
106       //  Move to a specified working directory. Returns 0 if OK, -1 if this failed.
107       CZMQ_EXPORT int
108           zsys_dir_change (const char *pathname);
109
110       //  Set private file creation mode; all files created from here will be
111       //  readable/writable by the owner only.
112       CZMQ_EXPORT void
113           zsys_file_mode_private (void);
114
115       //  Reset default file creation mode; all files created from here will use
116       //  process file mode defaults.
117       CZMQ_EXPORT void
118           zsys_file_mode_default (void);
119
120       //  Return the CZMQ version for run-time API detection; returns version
121       //  number into provided fields, providing reference isn't null in each case.
122       CZMQ_EXPORT void
123           zsys_version (int *major, int *minor, int *patch);
124
125       //  Format a string using printf formatting, returning a freshly allocated
126       //  buffer. If there was insufficient memory, returns NULL. Free the returned
127       //  string using zstr_free().
128       CZMQ_EXPORT char *
129           zsys_sprintf (const char *format, ...);
130
131       //  Format a string with a va_list argument, returning a freshly allocated
132       //  buffer. If there was insufficient memory, returns NULL. Free the returned
133       //  string using zstr_free().
134       CZMQ_EXPORT char *
135           zsys_vprintf (const char *format, va_list argptr);
136
137       //  Create UDP beacon socket; if the routable option is true, uses
138       //  multicast (not yet implemented), else uses broadcast. This method
139       //  and related ones might _eventually_ be moved to a zudp class.
140       //  *** This is for CZMQ internal use only and may change arbitrarily ***
141       CZMQ_EXPORT SOCKET
142           zsys_udp_new (bool routable);
143
144       //  Close a UDP socket
145       //  *** This is for CZMQ internal use only and may change arbitrarily ***
146       CZMQ_EXPORT int
147           zsys_udp_close (SOCKET handle);
148
149       //  Send zframe to UDP socket, return -1 if sending failed due to
150       //  interface having disappeared (happens easily with WiFi)
151       //  *** This is for CZMQ internal use only and may change arbitrarily ***
152       CZMQ_EXPORT int
153           zsys_udp_send (SOCKET udpsock, zframe_t *frame, inaddr_t *address, int addrlen);
154
155       //  Receive zframe from UDP socket, and set address of peer that sent it
156       //  The peername must be a char [INET_ADDRSTRLEN] array if IPv6 is disabled or
157       //  NI_MAXHOST if it's enabled. Returns NULL when failing to get peer address.
158       //  *** This is for CZMQ internal use only and may change arbitrarily ***
159       CZMQ_EXPORT zframe_t *
160           zsys_udp_recv (SOCKET udpsock, char *peername, int peerlen);
161
162       //  Handle an I/O error on some socket operation; will report and die on
163       //  fatal errors, and continue silently on "try again" errors.
164       //  *** This is for CZMQ internal use only and may change arbitrarily ***
165       CZMQ_EXPORT void
166           zsys_socket_error (const char *reason);
167
168       //  Return current host name, for use in public tcp:// endpoints. Caller gets
169       //  a freshly allocated string, should free it using zstr_free(). If the host
170       //  name is not resolvable, returns NULL.
171       CZMQ_EXPORT char *
172           zsys_hostname (void);
173
174       //  Move the current process into the background. The precise effect depends
175       //  on the operating system. On POSIX boxes, moves to a specified working
176       //  directory (if specified), closes all file handles, reopens stdin, stdout,
177       //  and stderr to the null device, and sets the process to ignore SIGHUP. On
178       //  Windows, does nothing. Returns 0 if OK, -1 if there was an error.
179       CZMQ_EXPORT int
180           zsys_daemonize (const char *workdir);
181
182       //  Drop the process ID into the lockfile, with exclusive lock, and switch
183       //  the process to the specified group and/or user. Any of the arguments
184       //  may be null, indicating a no-op. Returns 0 on success, -1 on failure.
185       //  Note if you combine this with zsys_daemonize, run after, not before
186       //  that method, or the lockfile will hold the wrong process ID.
187       CZMQ_EXPORT int
188           zsys_run_as (const char *lockfile, const char *group, const char *user);
189
190       //  Returns true if the underlying libzmq supports CURVE security.
191       //  Uses a heuristic probe according to the version of libzmq being used.
192       CZMQ_EXPORT bool
193           zsys_has_curve (void);
194
195       //  Configure the number of I/O threads that ZeroMQ will use. A good
196       //  rule of thumb is one thread per gigabit of traffic in or out. The
197       //  default is 1, sufficient for most applications. If the environment
198       //  variable ZSYS_IO_THREADS is defined, that provides the default.
199       //  Note that this method is valid only before any socket is created.
200       CZMQ_EXPORT void
201           zsys_set_io_threads (size_t io_threads);
202
203       //  Configure the scheduling policy of the ZMQ context thread pool.
204       //  Not available on Windows. See the sched_setscheduler man page or sched.h
205       //  for more information. If the environment variable ZSYS_THREAD_SCHED_POLICY
206       //  is defined, that provides the default.
207       //  Note that this method is valid only before any socket is created.
208       CZMQ_EXPORT void
209           zsys_set_thread_sched_policy (int policy);
210
211       //  Configure the scheduling priority of the ZMQ context thread pool.
212       //  Not available on Windows. See the sched_setscheduler man page or sched.h
213       //  for more information. If the environment variable ZSYS_THREAD_PRIORITY is
214       //  defined, that provides the default.
215       //  Note that this method is valid only before any socket is created.
216       CZMQ_EXPORT void
217           zsys_set_thread_priority (int priority);
218
219       //  Configure the number of sockets that ZeroMQ will allow. The default
220       //  is 1024. The actual limit depends on the system, and you can query it
221       //  by using zsys_socket_limit (). A value of zero means "maximum".
222       //  Note that this method is valid only before any socket is created.
223       CZMQ_EXPORT void
224           zsys_set_max_sockets (size_t max_sockets);
225
226       //  Return maximum number of ZeroMQ sockets that the system will support.
227       CZMQ_EXPORT size_t
228           zsys_socket_limit (void);
229
230       //  Configure the maximum allowed size of a message sent.
231       //  The default is INT_MAX.
232       CZMQ_EXPORT void
233           zsys_set_max_msgsz (int max_msgsz);
234
235       //  Return maximum message size.
236       CZMQ_EXPORT int
237           zsys_max_msgsz (void);
238
239       //  Configure the default linger timeout in msecs for new zsock instances.
240       //  You can also set this separately on each zsock_t instance. The default
241       //  linger time is zero, i.e. any pending messages will be dropped. If the
242       //  environment variable ZSYS_LINGER is defined, that provides the default.
243       //  Note that process exit will typically be delayed by the linger time.
244       CZMQ_EXPORT void
245           zsys_set_linger (size_t linger);
246
247       //  Configure the default outgoing pipe limit (HWM) for new zsock instances.
248       //  You can also set this separately on each zsock_t instance. The default
249       //  HWM is 1,000, on all versions of ZeroMQ. If the environment variable
250       //  ZSYS_SNDHWM is defined, that provides the default. Note that a value of
251       //  zero means no limit, i.e. infinite memory consumption.
252       CZMQ_EXPORT void
253           zsys_set_sndhwm (size_t sndhwm);
254
255       //  Configure the default incoming pipe limit (HWM) for new zsock instances.
256       //  You can also set this separately on each zsock_t instance. The default
257       //  HWM is 1,000, on all versions of ZeroMQ. If the environment variable
258       //  ZSYS_RCVHWM is defined, that provides the default. Note that a value of
259       //  zero means no limit, i.e. infinite memory consumption.
260       CZMQ_EXPORT void
261           zsys_set_rcvhwm (size_t rcvhwm);
262
263       //  Configure the default HWM for zactor internal pipes; this is set on both
264       //  ends of the pipe, for outgoing messages only (sndhwm). The default HWM is
265       //  1,000, on all versions of ZeroMQ. If the environment var ZSYS_ACTORHWM is
266       //  defined, that provides the default. Note that a value of zero means no
267       //  limit, i.e. infinite memory consumption.
268       CZMQ_EXPORT void
269           zsys_set_pipehwm (size_t pipehwm);
270
271       //  Return the HWM for zactor internal pipes.
272       CZMQ_EXPORT size_t
273           zsys_pipehwm (void);
274
275       //  Configure use of IPv6 for new zsock instances. By default sockets accept
276       //  and make only IPv4 connections. When you enable IPv6, sockets will accept
277       //  and connect to both IPv4 and IPv6 peers. You can override the setting on
278       //  each zsock_t instance. The default is IPv4 only (ipv6 set to 0). If the
279       //  environment variable ZSYS_IPV6 is defined (as 1 or 0), this provides the
280       //  default. Note: has no effect on ZMQ v2.
281       CZMQ_EXPORT void
282           zsys_set_ipv6 (int ipv6);
283
284       //  Return use of IPv6 for zsock instances.
285       CZMQ_EXPORT int
286           zsys_ipv6 (void);
287
288       //  Set network interface name to use for broadcasts, particularly zbeacon.
289       //  This lets the interface be configured for test environments where required.
290       //  For example, on Mac OS X, zbeacon cannot bind to 255.255.255.255 which is
291       //  the default when there is no specified interface. If the environment
292       //  variable ZSYS_INTERFACE is set, use that as the default interface name.
293       //  Setting the interface to "*" means "use all available interfaces".
294       CZMQ_EXPORT void
295           zsys_set_interface (const char *value);
296
297       //  Return network interface to use for broadcasts, or "" if none was set.
298       CZMQ_EXPORT const char *
299           zsys_interface (void);
300
301       //  Set IPv6 address to use zbeacon socket, particularly for receiving zbeacon.
302       //  This needs to be set IPv6 is enabled as IPv6 can have multiple addresses
303       //  on a given interface. If the environment variable ZSYS_IPV6_ADDRESS is set,
304       //  use that as the default IPv6 address.
305       CZMQ_EXPORT void
306           zsys_set_ipv6_address (const char *value);
307
308       //  Return IPv6 address to use for zbeacon reception, or "" if none was set.
309       CZMQ_EXPORT const char *
310           zsys_ipv6_address (void);
311
312       //  Set IPv6 milticast address to use for sending zbeacon messages. This needs
313       //  to be set if IPv6 is enabled. If the environment variable
314       //  ZSYS_IPV6_MCAST_ADDRESS is set, use that as the default IPv6 multicast
315       //  address.
316       CZMQ_EXPORT void
317           zsys_set_ipv6_mcast_address (const char *value);
318
319       //  Return IPv6 multicast address to use for sending zbeacon, or "" if none was
320       //  set.
321       CZMQ_EXPORT const char *
322           zsys_ipv6_mcast_address (void);
323
324       //  Configure the automatic use of pre-allocated FDs when creating new sockets.
325       //  If 0 (default), nothing will happen. Else, when a new socket is bound, the
326       //  system API will be used to check if an existing pre-allocated FD with a
327       //  matching port (if TCP) or path (if IPC) exists, and if it does it will be
328       //  set via the ZMQ_USE_FD socket option so that the library will use it
329       //  instead of creating a new socket.
330       CZMQ_EXPORT void
331           zsys_set_auto_use_fd (int auto_use_fd);
332
333       //  Return use of automatic pre-allocated FDs for zsock instances.
334       CZMQ_EXPORT int
335           zsys_auto_use_fd (void);
336
337       //  Set log identity, which is a string that prefixes all log messages sent
338       //  by this process. The log identity defaults to the environment variable
339       //  ZSYS_LOGIDENT, if that is set.
340       CZMQ_EXPORT void
341           zsys_set_logident (const char *value);
342
343       //  Set stream to receive log traffic. By default, log traffic is sent to
344       //  stdout. If you set the stream to NULL, no stream will receive the log
345       //  traffic (it may still be sent to the system facility).
346       CZMQ_EXPORT void
347           zsys_set_logstream (FILE *stream);
348
349       //  Sends log output to a PUB socket bound to the specified endpoint. To
350       //  collect such log output, create a SUB socket, subscribe to the traffic
351       //  you care about, and connect to the endpoint. Log traffic is sent as a
352       //  single string frame, in the same format as when sent to stdout. The
353       //  log system supports a single sender; multiple calls to this method will
354       //  bind the same sender to multiple endpoints. To disable the sender, call
355       //  this method with a null argument.
356       CZMQ_EXPORT void
357           zsys_set_logsender (const char *endpoint);
358
359       //  Enable or disable logging to the system facility (syslog on POSIX boxes,
360       //  event log on Windows). By default this is disabled.
361       CZMQ_EXPORT void
362           zsys_set_logsystem (bool logsystem);
363
364       //  Log error condition - highest priority
365       CZMQ_EXPORT void
366           zsys_error (const char *format, ...);
367
368       //  Log warning condition - high priority
369       CZMQ_EXPORT void
370           zsys_warning (const char *format, ...);
371
372       //  Log normal, but significant, condition - normal priority
373       CZMQ_EXPORT void
374           zsys_notice (const char *format, ...);
375
376       //  Log informational message - low priority
377       CZMQ_EXPORT void
378           zsys_info (const char *format, ...);
379
380       //  Log debug-level message - lowest priority
381       CZMQ_EXPORT void
382           zsys_debug (const char *format, ...);
383
384       //  Self test of this class.
385       CZMQ_EXPORT void
386           zsys_test (bool verbose);
387
388       #ifdef CZMQ_BUILD_DRAFT_API
389       //  *** Draft method, for development use, may change without warning ***
390       //  Check if default interrupt handler of Ctrl-C or SIGTERM was called.
391       //  Does not work if ZSYS_SIGHANDLER is false and code does not call
392       //  set interrupted on signal.
393       CZMQ_EXPORT bool
394           zsys_is_interrupted (void);
395
396       //  *** Draft method, for development use, may change without warning ***
397       //  Set interrupted flag. This is done by default signal handler, however
398       //  this can be handy for language bindings or cases without default
399       //  signal handler.
400       CZMQ_EXPORT void
401           zsys_set_interrupted (void);
402
403       //  *** Draft method, for development use, may change without warning ***
404       //  Configure whether to use zero copy strategy in libzmq. If the environment
405       //  variable ZSYS_ZERO_COPY_RECV is defined, that provides the default.
406       //  Otherwise the default is 1.
407       CZMQ_EXPORT void
408           zsys_set_zero_copy_recv (int zero_copy);
409
410       //  *** Draft method, for development use, may change without warning ***
411       //  Return ZMQ_ZERO_COPY_RECV option.
412       CZMQ_EXPORT int
413           zsys_zero_copy_recv (void);
414
415       //  *** Draft method, for development use, may change without warning ***
416       //  Configure the threshold value of filesystem object age per st_mtime
417       //  that should elapse until we consider that object "stable" at the
418       //  current zclock_time() moment.
419       //  The default is S_DEFAULT_ZSYS_FILE_STABLE_AGE_MSEC defined in zsys.c
420       //  which generally depends on host OS, with fallback value of 5000.
421       CZMQ_EXPORT void
422           zsys_set_file_stable_age_msec (int64_t file_stable_age_msec);
423
424       //  *** Draft method, for development use, may change without warning ***
425       //  Return current threshold value of file stable age in msec.
426       //  This can be used in code that chooses to wait for this timeout
427       //  before testing if a filesystem object is "stable" or not.
428       CZMQ_EXPORT int64_t
429           zsys_file_stable_age_msec (void);
430
431       #endif // CZMQ_BUILD_DRAFT_API
432       Please add '@interface' section in './../src/zsys.c'.
433

DESCRIPTION

435       The zsys class provides a portable wrapper for system calls. We collect
436       them here to reduce the number of weird #ifdefs in other classes. As
437       far as possible, the bulk of CZMQ classes are fully portable.
438
439       Please add @discuss section in ./../src/zsys.c.
440

EXAMPLE

442       From zsys_test method.
443
444           zsys_catch_interrupts ();
445
446           //  Check capabilities without using the return value
447           int rc = zsys_has_curve ();
448
449           const char *SELFTEST_DIR_RW = "src/selftest-rw";
450
451           if (verbose) {
452               char *hostname = zsys_hostname ();
453               zsys_info ("host name is %s", hostname);
454               freen (hostname);
455               zsys_info ("system limit is %zu ZeroMQ sockets", zsys_socket_limit ());
456           }
457           #ifdef CZMQ_BUILD_DRAFT_API
458           zsys_set_file_stable_age_msec (5123);
459           assert (zsys_file_stable_age_msec() == 5123);
460           zsys_set_file_stable_age_msec (-1);
461           assert (zsys_file_stable_age_msec() == 5123);
462           #endif // CZMQ_BUILD_DRAFT_API
463           zsys_set_linger (0);
464           zsys_set_sndhwm (1000);
465           zsys_set_rcvhwm (1000);
466           zsys_set_pipehwm (2500);
467           assert (zsys_pipehwm () == 2500);
468           zsys_set_ipv6 (0);
469           zsys_set_thread_priority (-1);
470           zsys_set_thread_sched_policy (-1);
471           zsys_set_zero_copy_recv(0);
472           assert (0 == zsys_zero_copy_recv());
473           zsys_set_zero_copy_recv(1);
474           assert (1 == zsys_zero_copy_recv());
475
476           //  Test pipe creation
477           zsock_t *pipe_back;
478           zsock_t *pipe_front = zsys_create_pipe (&pipe_back);
479           zstr_send (pipe_front, "Hello");
480           char *string = zstr_recv (pipe_back);
481           assert (streq (string, "Hello"));
482           freen (string);
483           zsock_destroy (&pipe_back);
484           zsock_destroy (&pipe_front);
485
486           //  Test file manipulation
487
488           // Don't let anyone fool our workspace
489           if (zsys_file_exists ("nosuchfile")) {
490               zsys_warning ("zsys_test() had to remove 'nosuchfile' which was not expected here at all");
491               zsys_file_delete ("nosuchfile");
492           }
493
494           rc = zsys_file_delete ("nosuchfile");
495           assert (rc == -1);
496
497           bool rc_bool = zsys_file_exists ("nosuchfile");
498           assert (rc_bool != true);
499
500           rc = (int) zsys_file_size ("nosuchfile");
501           assert (rc == -1);
502
503           time_t when = zsys_file_modified (".");
504           assert (when > 0);
505
506           int mode = zsys_file_mode (".");
507           assert (S_ISDIR (mode));
508           assert (mode & S_IRUSR);
509           assert (mode & S_IWUSR);
510
511           const char *testbasedir  = ".testsys";
512           const char *testsubdir  = "subdir";
513           char *basedirpath = NULL;   // subdir in a test, under SELFTEST_DIR_RW
514           char *dirpath = NULL;       // subdir in a test, under basedirpath
515           char *relsubdir = NULL;     // relative short "path" of subdir under testbasedir
516
517           basedirpath = zsys_sprintf ("%s/%s", SELFTEST_DIR_RW, testbasedir);
518           assert (basedirpath);
519           dirpath = zsys_sprintf ("%s/%s", basedirpath, testsubdir);
520           assert (dirpath);
521           relsubdir = zsys_sprintf ("%s/%s", testbasedir, testsubdir);
522           assert (relsubdir);
523
524           // Normally tests clean up in the end, but if a selftest run dies
525           // e.g. on assert(), workspace remains dirty. Better clean it up.
526           // We do not really care about results here - we clean up a possible
527           // dirty exit of an older build. If there are permission errors etc.
528           // the actual tests below would explode.
529           if (zsys_file_exists(dirpath)) {
530               if (verbose)
531                   zsys_debug ("zsys_test() has to remove ./%s that should not have been here", dirpath);
532               zsys_dir_delete (dirpath);
533           }
534           if (zsys_file_exists (basedirpath)) {
535               if (verbose)
536                   zsys_debug ("zsys_test() has to remove ./%s that should not have been here", basedirpath);
537               zsys_dir_delete (basedirpath);
538           }
539
540           // Added tracing because this file-age check fails on some systems
541           // presumably due to congestion in a mass-build and valgrind on top
542           zsys_file_mode_private ();
543           if (verbose)
544               printf ("zsys_test() at timestamp %" PRIi64 ": "
545                   "Creating %s\n",
546                   zclock_time(), relsubdir );
547           rc = zsys_dir_create ("%s/%s", SELFTEST_DIR_RW, relsubdir);
548           if (verbose)
549               printf ("zsys_test() at timestamp %" PRIi64 ": "
550                   "Finished creating %s with return-code %d\n",
551                   zclock_time(), relsubdir, rc );
552           assert (rc == 0);
553           when = zsys_file_modified (dirpath);
554           if (verbose)
555               printf ("zsys_test() at timestamp %" PRIi64 ": "
556                   "Finished calling zsys_file_modified(), got age %jd\n",
557                   zclock_time(), (intmax_t)when );
558           assert (when > 0);
559           if (verbose)
560               printf ("zsys_test() at timestamp %" PRIi64 ": "
561                   "Checking if file is NOT stable (is younger than 1 sec)\n",
562                   zclock_time() );
563           assert (!s_zsys_file_stable (dirpath, verbose));
564           if (verbose)
565               printf ("zsys_test() at timestamp %" PRIi64 ": "
566                   "Passed the test, file is not stable - as expected\n",
567                   zclock_time() );
568           rc = zsys_dir_delete ("%s/%s", SELFTEST_DIR_RW, relsubdir);
569           assert (rc == 0);
570           rc = zsys_dir_delete ("%s/%s", SELFTEST_DIR_RW, testbasedir);
571           assert (rc == 0);
572           zsys_file_mode_default ();
573
574           #if (defined (PATH_MAX))
575           char cwd[PATH_MAX];
576           #else
577           # if (defined (_MAX_PATH))
578           char cwd[_MAX_PATH];
579           # else
580           char cwd[1024];
581           # endif
582           #endif
583           memset (cwd, 0, sizeof(cwd));
584           #if (defined (WIN32))
585           if (_getcwd(cwd, sizeof(cwd)) != NULL) {
586           #else
587           if (getcwd(cwd, sizeof(cwd)) != NULL) {
588           #endif
589               if (verbose)
590                   printf ("zsys_test() at timestamp %" PRIi64 ": "
591                       "current working directory is %s\n",
592                       zclock_time(), cwd);
593               assert (zsys_dir_change (SELFTEST_DIR_RW) == 0);
594               assert (zsys_dir_change (cwd) == 0);
595           }
596           else {
597               zsys_warning ("zsys_test() : got getcwd() error... "
598                   "testing zsys_dir_change() anyway, but it can confuse "
599                   "subsequent tests in this process");
600               assert (zsys_dir_change (SELFTEST_DIR_RW) == 0);
601           }
602
603           zstr_free (&basedirpath);
604           zstr_free (&dirpath);
605           zstr_free (&relsubdir);
606
607           // Other subtests
608           int major, minor, patch;
609           zsys_version (&major, &minor, &patch);
610           assert (major == CZMQ_VERSION_MAJOR);
611           assert (minor == CZMQ_VERSION_MINOR);
612           assert (patch == CZMQ_VERSION_PATCH);
613
614           string = zsys_sprintf ("%s %02x", "Hello", 16);
615           assert (streq (string, "Hello 10"));
616           freen (string);
617
618           char *str64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890,.";
619           int num10 = 1234567890;
620           string = zsys_sprintf ("%s%s%s%s%d", str64, str64, str64, str64, num10);
621           assert (strlen (string) == (4 * 64 + 10));
622           freen (string);
623
624           //  Test logging system
625           zsys_set_logident ("czmq_selftest");
626           zsys_set_logsender ("inproc://logging");
627           void *logger = zsys_socket (ZMQ_SUB, NULL, 0);
628           assert (logger);
629           rc = zmq_connect (logger, "inproc://logging");
630           assert (rc == 0);
631           rc = zmq_setsockopt (logger, ZMQ_SUBSCRIBE, "", 0);
632           assert (rc == 0);
633
634           if (verbose) {
635               zsys_error ("This is an %s message", "error");
636               zsys_warning ("This is a %s message", "warning");
637               zsys_notice ("This is a %s message", "notice");
638               zsys_info ("This is a %s message", "info");
639               zsys_debug ("This is a %s message", "debug");
640               zsys_set_logident ("hello, world");
641               zsys_info ("This is a %s message", "info");
642               zsys_debug ("This is a %s message", "debug");
643
644               //  Check that logsender functionality is working
645               char *received = zstr_recv (logger);
646               assert (received);
647               zstr_free (&received);
648           }
649           zsys_close (logger, NULL, 0);
650
651

AUTHORS

653       The czmq manual was written by the authors in the AUTHORS file.
654

RESOURCES

656       Main web site:
657
658       Report bugs to the email <zeromq-dev@lists.zeromq.org[1]>
659
661       Copyright (c) the Contributors as noted in the AUTHORS file. This file
662       is part of CZMQ, the high-level C binding for 0MQ:
663       http://czmq.zeromq.org. This Source Code Form is subject to the terms
664       of the Mozilla Public License, v. 2.0. If a copy of the MPL was not
665       distributed with this file, You can obtain one at
666       http://mozilla.org/MPL/2.0/. LICENSE included with the czmq
667       distribution.
668

NOTES

670        1. zeromq-dev@lists.zeromq.org
671           mailto:zeromq-dev@lists.zeromq.org
672
673
674
675CZMQ 4.1.1                        07/24/2019                           ZSYS(3)
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