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/*
* Program to print default POSIX message queue attributes
*/
/*
* Copyright 2018 Joel Sherrill (joel@rtems.org)
*
* This file's license is 2-clause BSD as in this distribution's LICENSE.2 file.
*/
#include <stdlib.h>
#include <stdio.h>
#include <inttypes.h>
#include <assert.h>
#include <fcntl.h> /* For O_* constants */
#include <sys/stat.h>
#include <mqueue.h>
static void print_attr(mqd_t mqd)
{
int rc;
struct mq_attr attr;
rc = mq_getattr( mqd, &attr );
assert( rc == 0 );
printf( "mq_maxmsg: %ld\n", attr.mq_maxmsg );
printf( "mq_msgsize: %ld\n", attr.mq_msgsize );
}
int main()
{
mqd_t mqd;
puts( "*** POSIX Message Queue Default Attributes Report ***" );
mqd = mq_open( "/testq", O_CREAT|O_RDWR, 0777, NULL );
if ( mqd == (mqd_t) -1 ) {
perror("mq_open" );
}
assert( mqd != (mqd_t) -1 );
print_attr( mqd );
puts( "*** END OF POSIX Message Queue Default Attributes Report ***" );
exit( 0 );
}
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