11/18/2023 0 Comments Posix message queueSee our policies on allowed topics for more details.Ĥ. Questions that straddle the line between learning programming and learning other tech topics are ok: we don't expect beginners to know how exactly to categorize their question. Tech support and hardware recommendation questions count as "completely unrelated". Self promotion from first time posters without prior participation in the subreddit is explicitly forbidden.ĭo not post questions that are completely unrelated to programming, software engineering, and related fields. When in doubt, message the mods and ask them to review your post. Your post should not "feel spammy".ĭistinguishing between tasteless and tasteful self-promotion is inherently subjective. In short, your posting history should not be predominantly self-promotional and your resource should be high-quality and complete. When posting some resource or tutorial you've made, you must follow our self-promotion policies. See our policies on acceptable speech and conduct for more details. Disagreement and technical critiques are ok, but personal attacks are not.Ībusive, racist, or derogatory comments are absolutely not tolerated. Communicate to others the same way you would at your workplace. No unprofessional/derogatory speechįollow reddiquette: behave professionally and civilly at all times. See conceptual questions guidelines for more info. If your question is similar to one in the FAQ, explain how it's different. Read our FAQ and search old posts before asking your question. Many conceptual questions have already been asked and answered. See debugging question guidelines for more info. If you got an error, include the full error message. The output you expected, and what you got instead.A minimal, easily runnable, and well-formatted program that illustrates your problem.If you need help debugging, you must include: Since Linux 3.Welcome to LearnProgramming! New? READ ME FIRST! Posting guidelines Frequently asked questions Subreddit rules Message the moderators Asking debugging questions Mq_msgsize values that are assigned to a message queue that isĬreated with a call to mq_open(3) in which the attr argument is The program below can be used to show the default mq_maxmsg and Layered on top of the mq_getsetattr(2) system call. On Linux, mq_getattr() and mq_setattr() are library functions │ mq_getattr(), mq_setattr() │ Thread safety │ MT-Safe │ Is returned, with errno set to indicate the error.ĮRRORS top EBADF The message queue descriptor specified in mqdes isĮINVAL newattr->mq_flags contained set bits other thanįor an explanation of the terms used in this section, see On success mq_getattr() and mq_setattr() return 0 on error, -1 The same information that is returned by mq_getattr(). It points to is used to return an mq_attr structure that contains If the oldattr field is not NULL, then the buffer that Only attribute that can be modified is the setting of the Supplied in the mq_attr structure pointed to by newattr. Mq_setattr() sets message queue attributes using information The mq_curmsgs field returns the number of messages currently Place ceilings on the values for these fields are described in Both of theseįields must have a value greater than zero. Size of messages that may be placed on the queue. The mq_msgsize field is an upper limit on the Limit on the number of messages that may be placed on the queue The mq_maxmsg and mq_msgsize fields are set when the message The mq_flags field contains flags associated with the open Long mq_curmsgs /* # of messages currently in queue */ Long mq_flags /* Flags: 0 or O_NONBLOCK */ Mq_getattr() returns an mq_attr structure in the buffer pointed SYNOPSIS top #include int mq_getattr(mqd_t mqdes, struct mq_attr * attr ) int mq_setattr(mqd_t mqdes, const struct mq_attr *restrict newattr, struct mq_attr *restrict oldattr ) DESCRIPTION top mq_getattr() and mq_setattr() respectively retrieve and modifyĪttributes of the message queue referred to by the message queue Mq_getattr, mq_setattr - get/set message queue attributes Mq_getattr(3) Library Functions Manual mq_getattr(3) NAME top
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