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539 lines
21 KiB
539 lines
21 KiB
'\" t
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.\" Title: zsys
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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 "ZSYS" "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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zsys \- system\-level methods
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.SH "SYNOPSIS"
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.sp
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.nf
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#define UDP_FRAME_MAX 255 // Max size of UDP frame
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// Callback for interrupt signal handler
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typedef void (zsys_handler_fn) (int signal_value);
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// Initialize CZMQ zsys layer; this happens automatically when you create
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// a socket or an actor; however this call lets you force initialization
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// earlier, so e\&.g\&. logging is properly set\-up before you start working\&.
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// Not threadsafe, so call only from main thread\&. Safe to call multiple
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// times\&. Returns global CZMQ context\&.
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CZMQ_EXPORT void *
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zsys_init (void);
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// Optionally shut down the CZMQ zsys layer; this normally happens automatically
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// when the process exits; however this call lets you force a shutdown
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// earlier, avoiding any potential problems with atexit() ordering, especially
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// with Windows dlls\&.
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CZMQ_EXPORT void
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zsys_shutdown (void);
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// Get a new ZMQ socket, automagically creating a ZMQ context if this is
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// the first time\&. Caller is responsible for destroying the ZMQ socket
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// before process exits, to avoid a ZMQ deadlock\&. Note: you should not use
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// this method in CZMQ apps, use zsock_new() instead\&.
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// *** This is for CZMQ internal use only and may change arbitrarily ***
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CZMQ_EXPORT void *
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zsys_socket (int type, const char *filename, size_t line_nbr);
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// Destroy/close a ZMQ socket\&. You should call this for every socket you
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// create using zsys_socket()\&.
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// *** This is for CZMQ internal use only and may change arbitrarily ***
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CZMQ_EXPORT int
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zsys_close (void *handle, const char *filename, size_t line_nbr);
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// Return ZMQ socket name for socket type
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// *** This is for CZMQ internal use only and may change arbitrarily ***
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CZMQ_EXPORT char *
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zsys_sockname (int socktype);
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// Create a pipe, which consists of two PAIR sockets connected over inproc\&.
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// The pipe is configured to use the zsys_pipehwm setting\&. Returns the
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// frontend socket successful, NULL if failed\&.
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CZMQ_EXPORT zsock_t *
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zsys_create_pipe (zsock_t **backend_p);
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// Set interrupt handler; this saves the default handlers so that a
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// zsys_handler_reset () can restore them\&. If you call this multiple times
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// then the last handler will take affect\&. If handler_fn is NULL, disables
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// default SIGINT/SIGTERM handling in CZMQ\&.
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CZMQ_EXPORT void
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zsys_handler_set (zsys_handler_fn *handler_fn);
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// Reset interrupt handler, call this at exit if needed
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CZMQ_EXPORT void
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zsys_handler_reset (void);
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// Set default interrupt handler, so Ctrl\-C or SIGTERM will set
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// zsys_interrupted\&. Idempotent; safe to call multiple times\&.
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// *** This is for CZMQ internal use only and may change arbitrarily ***
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CZMQ_EXPORT void
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zsys_catch_interrupts (void);
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// Return 1 if file exists, else zero
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CZMQ_EXPORT bool
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zsys_file_exists (const char *filename);
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// Return size of file, or \-1 if not found
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CZMQ_EXPORT ssize_t
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zsys_file_size (const char *filename);
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// Return file modification time\&. Returns 0 if the file does not exist\&.
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CZMQ_EXPORT time_t
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zsys_file_modified (const char *filename);
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// Return file mode; provides at least support for the POSIX S_ISREG(m)
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// and S_ISDIR(m) macros and the S_IRUSR and S_IWUSR bits, on all boxes\&.
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// Returns a mode_t cast to int, or \-1 in case of error\&.
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CZMQ_EXPORT int
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zsys_file_mode (const char *filename);
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// Delete file\&. Does not complain if the file is absent
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CZMQ_EXPORT int
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zsys_file_delete (const char *filename);
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// Check if file is \*(Aqstable\*(Aq
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CZMQ_EXPORT bool
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zsys_file_stable (const char *filename);
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// Create a file path if it doesn\*(Aqt exist\&. The file path is treated as a
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// printf format\&.
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CZMQ_EXPORT int
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zsys_dir_create (const char *pathname, \&.\&.\&.);
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// Remove a file path if empty; the pathname is treated as printf format\&.
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CZMQ_EXPORT int
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zsys_dir_delete (const char *pathname, \&.\&.\&.);
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// Move to a specified working directory\&. Returns 0 if OK, \-1 if this failed\&.
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CZMQ_EXPORT int
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zsys_dir_change (const char *pathname);
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// Set private file creation mode; all files created from here will be
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// readable/writable by the owner only\&.
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CZMQ_EXPORT void
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zsys_file_mode_private (void);
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// Reset default file creation mode; all files created from here will use
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// process file mode defaults\&.
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CZMQ_EXPORT void
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zsys_file_mode_default (void);
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// Return the CZMQ version for run\-time API detection; returns version
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// number into provided fields, providing reference isn\*(Aqt null in each case\&.
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CZMQ_EXPORT void
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zsys_version (int *major, int *minor, int *patch);
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// Format a string using printf formatting, returning a freshly allocated
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// buffer\&. If there was insufficient memory, returns NULL\&. Free the returned
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// string using zstr_free()\&.
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CZMQ_EXPORT char *
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zsys_sprintf (const char *format, \&.\&.\&.);
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// Format a string with a va_list argument, returning a freshly allocated
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// buffer\&. If there was insufficient memory, returns NULL\&. Free the returned
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// string using zstr_free()\&.
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CZMQ_EXPORT char *
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zsys_vprintf (const char *format, va_list argptr);
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// Create UDP beacon socket; if the routable option is true, uses
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// multicast (not yet implemented), else uses broadcast\&. This method
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// and related ones might _eventually_ be moved to a zudp class\&.
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// *** This is for CZMQ internal use only and may change arbitrarily ***
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CZMQ_EXPORT SOCKET
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zsys_udp_new (bool routable);
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// Close a UDP socket
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// *** This is for CZMQ internal use only and may change arbitrarily ***
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CZMQ_EXPORT int
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zsys_udp_close (SOCKET handle);
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// Send zframe to UDP socket, return \-1 if sending failed due to
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// interface having disappeared (happens easily with WiFi)
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// *** This is for CZMQ internal use only and may change arbitrarily ***
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CZMQ_EXPORT int
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zsys_udp_send (SOCKET udpsock, zframe_t *frame, inaddr_t *address, int addrlen);
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// Receive zframe from UDP socket, and set address of peer that sent it
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// The peername must be a char [INET_ADDRSTRLEN] array\&.
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// *** This is for CZMQ internal use only and may change arbitrarily ***
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CZMQ_EXPORT zframe_t *
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zsys_udp_recv (SOCKET udpsock, char *peername, int peerlen);
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// Handle an I/O error on some socket operation; will report and die on
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// fatal errors, and continue silently on "try again" errors\&.
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// *** This is for CZMQ internal use only and may change arbitrarily ***
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CZMQ_EXPORT void
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zsys_socket_error (const char *reason);
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// Return current host name, for use in public tcp:// endpoints\&. Caller gets
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// a freshly allocated string, should free it using zstr_free()\&. If the host
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// name is not resolvable, returns NULL\&.
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CZMQ_EXPORT char *
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zsys_hostname (void);
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// Move the current process into the background\&. The precise effect depends
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// on the operating system\&. On POSIX boxes, moves to a specified working
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// directory (if specified), closes all file handles, reopens stdin, stdout,
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// and stderr to the null device, and sets the process to ignore SIGHUP\&. On
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// Windows, does nothing\&. Returns 0 if OK, \-1 if there was an error\&.
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CZMQ_EXPORT int
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zsys_daemonize (const char *workdir);
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// Drop the process ID into the lockfile, with exclusive lock, and switch
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// the process to the specified group and/or user\&. Any of the arguments
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// may be null, indicating a no\-op\&. Returns 0 on success, \-1 on failure\&.
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// Note if you combine this with zsys_daemonize, run after, not before
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// that method, or the lockfile will hold the wrong process ID\&.
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CZMQ_EXPORT int
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zsys_run_as (const char *lockfile, const char *group, const char *user);
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// Returns true if the underlying libzmq supports CURVE security\&.
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// Uses a heuristic probe according to the version of libzmq being used\&.
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CZMQ_EXPORT bool
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zsys_has_curve (void);
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// Configure the number of I/O threads that ZeroMQ will use\&. A good
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// rule of thumb is one thread per gigabit of traffic in or out\&. The
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// default is 1, sufficient for most applications\&. If the environment
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// variable ZSYS_IO_THREADS is defined, that provides the default\&.
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// Note that this method is valid only before any socket is created\&.
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CZMQ_EXPORT void
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zsys_set_io_threads (size_t io_threads);
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// Configure the number of sockets that ZeroMQ will allow\&. The default
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// is 1024\&. The actual limit depends on the system, and you can query it
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// by using zsys_socket_limit ()\&. A value of zero means "maximum"\&.
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// Note that this method is valid only before any socket is created\&.
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CZMQ_EXPORT void
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zsys_set_max_sockets (size_t max_sockets);
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// Return maximum number of ZeroMQ sockets that the system will support\&.
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CZMQ_EXPORT size_t
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zsys_socket_limit (void);
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// Configure the maximum allowed size of a message sent\&.
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// The default is INT_MAX\&.
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CZMQ_EXPORT void
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zsys_set_max_msgsz (int max_msgsz);
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// Return maximum message size\&.
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CZMQ_EXPORT int
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zsys_max_msgsz (void);
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// Configure the default linger timeout in msecs for new zsock instances\&.
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// You can also set this separately on each zsock_t instance\&. The default
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// linger time is zero, i\&.e\&. any pending messages will be dropped\&. If the
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// environment variable ZSYS_LINGER is defined, that provides the default\&.
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// Note that process exit will typically be delayed by the linger time\&.
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CZMQ_EXPORT void
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zsys_set_linger (size_t linger);
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// Configure the default outgoing pipe limit (HWM) for new zsock instances\&.
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// You can also set this separately on each zsock_t instance\&. The default
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// HWM is 1,000, on all versions of ZeroMQ\&. If the environment variable
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// ZSYS_SNDHWM is defined, that provides the default\&. Note that a value of
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// zero means no limit, i\&.e\&. infinite memory consumption\&.
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CZMQ_EXPORT void
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zsys_set_sndhwm (size_t sndhwm);
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// Configure the default incoming pipe limit (HWM) for new zsock instances\&.
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// You can also set this separately on each zsock_t instance\&. The default
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// HWM is 1,000, on all versions of ZeroMQ\&. If the environment variable
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// ZSYS_RCVHWM is defined, that provides the default\&. Note that a value of
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// zero means no limit, i\&.e\&. infinite memory consumption\&.
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CZMQ_EXPORT void
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zsys_set_rcvhwm (size_t rcvhwm);
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// Configure the default HWM for zactor internal pipes; this is set on both
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// ends of the pipe, for outgoing messages only (sndhwm)\&. The default HWM is
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// 1,000, on all versions of ZeroMQ\&. If the environment var ZSYS_ACTORHWM is
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// defined, that provides the default\&. Note that a value of zero means no
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// limit, i\&.e\&. infinite memory consumption\&.
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CZMQ_EXPORT void
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zsys_set_pipehwm (size_t pipehwm);
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// Return the HWM for zactor internal pipes\&.
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CZMQ_EXPORT size_t
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zsys_pipehwm (void);
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// Configure use of IPv6 for new zsock instances\&. By default sockets accept
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// and make only IPv4 connections\&. When you enable IPv6, sockets will accept
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// and connect to both IPv4 and IPv6 peers\&. You can override the setting on
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// each zsock_t instance\&. The default is IPv4 only (ipv6 set to 0)\&. If the
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// environment variable ZSYS_IPV6 is defined (as 1 or 0), this provides the
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// default\&. Note: has no effect on ZMQ v2\&.
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CZMQ_EXPORT void
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zsys_set_ipv6 (int ipv6);
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// Return use of IPv6 for zsock instances\&.
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CZMQ_EXPORT int
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zsys_ipv6 (void);
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// Set network interface name to use for broadcasts, particularly zbeacon\&.
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// This lets the interface be configured for test environments where required\&.
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// For example, on Mac OS X, zbeacon cannot bind to 255\&.255\&.255\&.255 which is
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// the default when there is no specified interface\&. If the environment
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// variable ZSYS_INTERFACE is set, use that as the default interface name\&.
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// Setting the interface to "*" means "use all available interfaces"\&.
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CZMQ_EXPORT void
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zsys_set_interface (const char *value);
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// Return network interface to use for broadcasts, or "" if none was set\&.
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CZMQ_EXPORT const char *
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zsys_interface (void);
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// Set IPv6 address to use zbeacon socket, particularly for receiving zbeacon\&.
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// This needs to be set IPv6 is enabled as IPv6 can have multiple addresses
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// on a given interface\&. If the environment variable ZSYS_IPV6_ADDRESS is set,
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// use that as the default IPv6 address\&.
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CZMQ_EXPORT void
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zsys_set_ipv6_address (const char *value);
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// Return IPv6 address to use for zbeacon reception, or "" if none was set\&.
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CZMQ_EXPORT const char *
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zsys_ipv6_address (void);
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// Set IPv6 milticast address to use for sending zbeacon messages\&. This needs
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// to be set if IPv6 is enabled\&. If the environment variable
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// ZSYS_IPV6_MCAST_ADDRESS is set, use that as the default IPv6 multicast
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// address\&.
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CZMQ_EXPORT void
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zsys_set_ipv6_mcast_address (const char *value);
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// Return IPv6 multicast address to use for sending zbeacon, or "" if none was
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// set\&.
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CZMQ_EXPORT const char *
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zsys_ipv6_mcast_address (void);
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// Configure the automatic use of pre\-allocated FDs when creating new sockets\&.
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// If 0 (default), nothing will happen\&. Else, when a new socket is bound, the
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// system API will be used to check if an existing pre\-allocated FD with a
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// matching port (if TCP) or path (if IPC) exists, and if it does it will be
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// set via the ZMQ_USE_FD socket option so that the library will use it
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// instead of creating a new socket\&.
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CZMQ_EXPORT void
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zsys_set_auto_use_fd (int auto_use_fd);
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// Return use of automatic pre\-allocated FDs for zsock instances\&.
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CZMQ_EXPORT int
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zsys_auto_use_fd (void);
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// Set log identity, which is a string that prefixes all log messages sent
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// by this process\&. The log identity defaults to the environment variable
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// ZSYS_LOGIDENT, if that is set\&.
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CZMQ_EXPORT void
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zsys_set_logident (const char *value);
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// Set stream to receive log traffic\&. By default, log traffic is sent to
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// stdout\&. If you set the stream to NULL, no stream will receive the log
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// traffic (it may still be sent to the system facility)\&.
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CZMQ_EXPORT void
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zsys_set_logstream (FILE *stream);
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// Sends log output to a PUB socket bound to the specified endpoint\&. To
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// collect such log output, create a SUB socket, subscribe to the traffic
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// you care about, and connect to the endpoint\&. Log traffic is sent as a
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// single string frame, in the same format as when sent to stdout\&. The
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// log system supports a single sender; multiple calls to this method will
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// bind the same sender to multiple endpoints\&. To disable the sender, call
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// this method with a null argument\&.
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CZMQ_EXPORT void
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zsys_set_logsender (const char *endpoint);
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// Enable or disable logging to the system facility (syslog on POSIX boxes,
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// event log on Windows)\&. By default this is disabled\&.
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CZMQ_EXPORT void
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zsys_set_logsystem (bool logsystem);
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// Log error condition \- highest priority
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CZMQ_EXPORT void
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zsys_error (const char *format, \&.\&.\&.);
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// Log warning condition \- high priority
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CZMQ_EXPORT void
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zsys_warning (const char *format, \&.\&.\&.);
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// Log normal, but significant, condition \- normal priority
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CZMQ_EXPORT void
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zsys_notice (const char *format, \&.\&.\&.);
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// Log informational message \- low priority
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CZMQ_EXPORT void
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zsys_info (const char *format, \&.\&.\&.);
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// Log debug\-level message \- lowest priority
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CZMQ_EXPORT void
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zsys_debug (const char *format, \&.\&.\&.);
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// Self test of this class
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CZMQ_EXPORT void
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zsys_test (bool verbose);
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// Global signal indicator, TRUE when user presses Ctrl\-C or the process
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// gets a SIGTERM signal\&.
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CZMQ_EXPORT extern volatile int zsys_interrupted;
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// Deprecated name for this variable
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CZMQ_EXPORT extern volatile int zctx_interrupted;
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Please add \*(Aq@interface\*(Aq section in \*(Aq\&./\&.\&./src/zsys\&.c\*(Aq\&.
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.fi
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.SH "DESCRIPTION"
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.sp
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The zsys class provides a portable wrapper for system calls\&. We collect them here to reduce the number of weird #ifdefs in other classes\&. As far as possible, the bulk of CZMQ classes are fully portable\&.
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.sp
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Please add \fI@discuss\fR section in \fI\&./\&.\&./src/zsys\&.c\fR\&.
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.SH "EXAMPLE"
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.PP
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\fBFrom zsys_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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zsys_catch_interrupts ();
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// Check capabilities without using the return value
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int rc = zsys_has_curve ();
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if (verbose) {
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char *hostname = zsys_hostname ();
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zsys_info ("host name is %s", hostname);
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free (hostname);
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zsys_info ("system limit is %zu ZeroMQ sockets", zsys_socket_limit ());
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}
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zsys_set_linger (0);
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zsys_set_sndhwm (1000);
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zsys_set_rcvhwm (1000);
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|
zsys_set_pipehwm (2500);
|
|
assert (zsys_pipehwm () == 2500);
|
|
zsys_set_ipv6 (0);
|
|
|
|
// Test pipe creation
|
|
zsock_t *pipe_back;
|
|
zsock_t *pipe_front = zsys_create_pipe (&pipe_back);
|
|
zstr_send (pipe_front, "Hello");
|
|
char *string = zstr_recv (pipe_back);
|
|
assert (streq (string, "Hello"));
|
|
free (string);
|
|
zsock_destroy (&pipe_back);
|
|
zsock_destroy (&pipe_front);
|
|
|
|
// Test file manipulation
|
|
rc = zsys_file_delete ("nosuchfile");
|
|
assert (rc == \-1);
|
|
|
|
bool rc_bool = zsys_file_exists ("nosuchfile");
|
|
assert (rc_bool != true);
|
|
|
|
rc = (int) zsys_file_size ("nosuchfile");
|
|
assert (rc == \-1);
|
|
|
|
time_t when = zsys_file_modified ("\&.");
|
|
assert (when > 0);
|
|
|
|
int mode = zsys_file_mode ("\&.");
|
|
assert (S_ISDIR (mode));
|
|
assert (mode & S_IRUSR);
|
|
assert (mode & S_IWUSR);
|
|
|
|
zsys_file_mode_private ();
|
|
rc = zsys_dir_create ("%s/%s", "\&.", "\&.testsys/subdir");
|
|
assert (rc == 0);
|
|
when = zsys_file_modified ("\&./\&.testsys/subdir");
|
|
assert (when > 0);
|
|
assert (!zsys_file_stable ("\&./\&.testsys/subdir"));
|
|
rc = zsys_dir_delete ("%s/%s", "\&.", "\&.testsys/subdir");
|
|
assert (rc == 0);
|
|
rc = zsys_dir_delete ("%s/%s", "\&.", "\&.testsys");
|
|
assert (rc == 0);
|
|
zsys_file_mode_default ();
|
|
assert (zsys_dir_change ("\&.") == 0);
|
|
|
|
int major, minor, patch;
|
|
zsys_version (&major, &minor, &patch);
|
|
assert (major == CZMQ_VERSION_MAJOR);
|
|
assert (minor == CZMQ_VERSION_MINOR);
|
|
assert (patch == CZMQ_VERSION_PATCH);
|
|
|
|
string = zsys_sprintf ("%s %02x", "Hello", 16);
|
|
assert (streq (string, "Hello 10"));
|
|
free (string);
|
|
|
|
char *str64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890,\&.";
|
|
int num10 = 1234567890;
|
|
string = zsys_sprintf ("%s%s%s%s%d", str64, str64, str64, str64, num10);
|
|
assert (strlen (string) == (4 * 64 + 10));
|
|
free (string);
|
|
|
|
// Test logging system
|
|
zsys_set_logident ("czmq_selftest");
|
|
zsys_set_logsender ("inproc://logging");
|
|
void *logger = zsys_socket (ZMQ_SUB, NULL, 0);
|
|
assert (logger);
|
|
rc = zmq_connect (logger, "inproc://logging");
|
|
assert (rc == 0);
|
|
rc = zmq_setsockopt (logger, ZMQ_SUBSCRIBE, "", 0);
|
|
assert (rc == 0);
|
|
|
|
if (verbose) {
|
|
zsys_error ("This is an %s message", "error");
|
|
zsys_warning ("This is a %s message", "warning");
|
|
zsys_notice ("This is a %s message", "notice");
|
|
zsys_info ("This is a %s message", "info");
|
|
zsys_debug ("This is a %s message", "debug");
|
|
zsys_set_logident ("hello, world");
|
|
zsys_info ("This is a %s message", "info");
|
|
zsys_debug ("This is a %s message", "debug");
|
|
|
|
// Check that logsender functionality is working
|
|
char *received = zstr_recv (logger);
|
|
assert (received);
|
|
zstr_free (&received);
|
|
}
|
|
zsys_close (logger, NULL, 0);
|
|
.fi
|
|
.if n \{\
|
|
.RE
|
|
.\}
|
|
.sp
|
|
.SH "AUTHORS"
|
|
.sp
|
|
The czmq manual was written by the authors in the AUTHORS file\&.
|
|
.SH "RESOURCES"
|
|
.sp
|
|
Main web site: \m[blue]\fB\%\fR\m[]
|
|
.sp
|
|
Report bugs to the email <\m[blue]\fBzeromq\-dev@lists\&.zeromq\&.org\fR\m[]\&\s-2\u[1]\d\s+2>
|
|
.SH "COPYRIGHT"
|
|
.sp
|
|
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\&.
|
|
.SH "NOTES"
|
|
.IP " 1." 4
|
|
zeromq-dev@lists.zeromq.org
|
|
.RS 4
|
|
\%mailto:zeromq-dev@lists.zeromq.org
|
|
.RE
|
|
|