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C/C++ code:
/* -----mqcreate1.c-------- */
#include <unistd.h>
#include <sys/types.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <mqueue.h>
#include <stdio.h>
#define FILE_MODE (S_IRUSR | S_IWUSR | S_IROTH | S_IRGRP)
int main(int argc, char **argv)
{
int c, flags;
mqd_t mqd;

flags = O_RDWR | O_CREAT;

while ((c = getopt(argc, argv, "e")) != -1)
{
switch (c)
{
case 'e': flags |= O_EXCL;
break;
}
}
if (optind != argc -1)
{
perror("usage:mqcreate [-e] <name>");
exit(1);
}

mqd = mq_open(argv[optind], flags, FILE_MODE, NULL );
if (mqd == -1)
{
perror("mq_open error");
}
printf("mqd = %d\n", mqd);
mq_close(mqd);
exit(0);
}




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