Programming

#include "unpipc.h"
# include    <mqueue.h>

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;
        }
    }
    printf("optind = %d,argc = %d\n",optind,argc);
    printf("argv[optiond]: %s\n", argv[optind]);
    if (optind != argc -1)
        err_quit("usage: mqcreate [ - e ] <name>");

    if ((mqd = mq_open(argv[optind], flags, FILE_MODE, NULL)) < 0) {
        printf( "strerror says open failed: %s\n",strerror(errno));
        err_quit("create mqueue failed!\n");
    }
    else
        printf("create mqueue successful\n");
    mq_close(mqd);
    exit(0);
}