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This program should print out the default attribute settings for a
POSIX message queue.
#include <mqueue.h>
#include <stdio.h>
main()
{
mqd_t mqfd;
struct mq_attr mqstat;
int status;
/* this should create it */
mqfd = mq_open("myipc",O_WRONLY|O_CREAT,NULL);
if ( (int)mqfd == -1 ) {
perror( "Unable to open message queue" );
exit( 1 );
}
status = mq_getattr(mqfd, &mqstat);
if ( !status ) {
printf( "mq_maxmsg: %d\n", mqstat.mq_maxmsg );
printf( "mq_msgsize: %d\n", mqstat.mq_msgsize );
printf( "mq_curmsgs: %d\n", mqstat.mq_curmsgs );
} else {
perror( "Unable to get attributes on message queue" );
exit( 1 );
}
/* this should delete it */
(void) mq_close( mqfd );
exit( 0 );
}
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