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6db92b9 Jul 6, 2016
@hintjens @uDude @myd7349 @xakon @sonneveld @monsdar @nsfw @ltg1710 @igorw
192 lines (166 sloc) 4.98 KB
/* =====================================================================
zhelpers.h
Helper header file for example applications.
=====================================================================
*/
#ifndef __ZHELPERS_H_INCLUDED__
#define __ZHELPERS_H_INCLUDED__
// Include a bunch of headers that we will need in the examples
#include <zmq.h>
#include <assert.h>
#include <signal.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#if (!defined (WIN32))
# include <sys/time.h>
#endif
#if (defined (WIN32))
# include <windows.h>
#endif
// Version checking, and patch up missing constants to match 2.1
#if ZMQ_VERSION_MAJOR == 2
# error "Please upgrade to ZeroMQ/3.2 for these examples"
#endif
// On some version of Windows, POSIX subsystem is not installed by default.
// So define srandom and random ourself.
#if (defined (WIN32))
# define srandom srand
# define random rand
#endif
// Provide random number from 0..(num-1)
#define randof(num) (int) ((float) (num) * random () / (RAND_MAX + 1.0))
// Receive 0MQ string from socket and convert into C string
// Caller must free returned string. Returns NULL if the context
// is being terminated.
static char *
s_recv (void *socket) {
char buffer [256];
int size = zmq_recv (socket, buffer, 255, 0);
if (size == -1)
return NULL;
return strndup (buffer, sizeof(buffer) - 1);
// remember that the strdup family of functions use malloc/alloc for space for the new string. It must be manually
// freed when you are done with it. Failure to do so will allow a heap attack.
}
// Convert C string to 0MQ string and send to socket
static int
s_send (void *socket, char *string) {
int size = zmq_send (socket, string, strlen (string), 0);
return size;
}
// Sends string as 0MQ string, as multipart non-terminal
static int
s_sendmore (void *socket, char *string) {
int size = zmq_send (socket, string, strlen (string), ZMQ_SNDMORE);
return size;
}
// Receives all message parts from socket, prints neatly
//
static void
s_dump (void *socket)
{
int rc;
zmq_msg_t message;
rc = zmq_msg_init (&message);
assert (rc == 0);
puts ("----------------------------------------");
// Process all parts of the message
do {
int size = zmq_msg_recv (&message, socket, 0);
assert (size >= 0);
// Dump the message as text or binary
char *data = (char*)zmq_msg_data (&message);
assert (data != 0);
int is_text = 1;
int char_nbr;
for (char_nbr = 0; char_nbr < size; char_nbr++) {
if ((unsigned char) data [char_nbr] < 32
|| (unsigned char) data [char_nbr] > 126) {
is_text = 0;
}
}
printf ("[%03d] ", size);
for (char_nbr = 0; char_nbr < size; char_nbr++) {
if (is_text) {
printf ("%c", data [char_nbr]);
} else {
printf ("%02X", (unsigned char) data [char_nbr]);
}
}
printf ("\n");
} while (zmq_msg_more (&message));
rc = zmq_msg_close (&message);
assert (rc == 0);
}
#if (!defined (WIN32))
// Set simple random printable identity on socket
// Caution:
// DO NOT call this version of s_set_id from multiple threads on MS Windows
// since s_set_id will call rand() on MS Windows. rand(), however, is not
// reentrant or thread-safe. See issue #521.
static void
s_set_id (void *socket)
{
char identity [10];
sprintf (identity, "%04X-%04X", randof (0x10000), randof (0x10000));
zmq_setsockopt (socket, ZMQ_IDENTITY, identity, strlen (identity));
}
#else
// Fix #521 for MS Windows.
static void
s_set_id(void *socket, intptr_t id)
{
char identity [10];
sprintf(identity, "%04X", (int)id);
zmq_setsockopt(socket, ZMQ_IDENTITY, identity, strlen(identity));
}
#endif
// Sleep for a number of milliseconds
static void
s_sleep (int msecs)
{
#if (defined (WIN32))
Sleep (msecs);
#else
struct timespec t;
t.tv_sec = msecs / 1000;
t.tv_nsec = (msecs % 1000) * 1000000;
nanosleep (&t, NULL);
#endif
}
// Return current system clock as milliseconds
static int64_t
s_clock (void)
{
#if (defined (WIN32))
SYSTEMTIME st;
GetSystemTime (&st);
return (int64_t) st.wSecond * 1000 + st.wMilliseconds;
#else
struct timeval tv;
gettimeofday (&tv, NULL);
return (int64_t) (tv.tv_sec * 1000 + tv.tv_usec / 1000);
#endif
}
// Print formatted string to stdout, prefixed by date/time and
// terminated with a newline.
static void
s_console (const char *format, ...)
{
time_t curtime = time (NULL);
struct tm *loctime = localtime (&curtime);
char *formatted = (char*)malloc (20);
strftime (formatted, 20, "%y-%m-%d %H:%M:%S ", loctime);
printf ("%s", formatted);
free (formatted);
va_list argptr;
va_start (argptr, format);
vprintf (format, argptr);
va_end (argptr);
printf ("\n");
}
#endif // __ZHELPERS_H_INCLUDED__