Posix消息队列的基本操作——发送消息

#include <unistd.h>
#include <mqueue.h>
#include <stdlib.h>
#include <stdio.h>

int main(int argc, char** argv)
{
mqd_t   mqd;
void    *ptr;
size_t  len;
size_t  prio;

if(argc != 4)
{
printf("usage: mqsend <name> <#bytes> <priority>");
}
len = atoi(argv[2]);
prio = atoi(argv[3]);
mqd = mq_open(argv[1], O_WRONLY);

ptr = calloc(len, sizeof(char));

mq_send(mqd, ptr, len, prio);

exit(0);
}