Mixing
ANSIC IPC message queue What is the type's meaning in struct msgbuf
As the title saying, I have a trouble with getting clear about the meaning of struct msgbuf's member variable "type"
struct msgbuf
{
long type;
char text[100];
};
I have no idea about when can it be used and for what, so can anyone give me a hand please....
unix ipc message-queue ansi-c
asked Nov 20 '18 at 15:47
anonymousanonymous
326
add a comment |
As the title saying, I have a trouble with getting clear about the meaning of struct msgbuf's member variable "type"
struct msgbuf
{
long type;
char text[100];
};
I have no idea about when can it be used and for what, so can anyone give me a hand please....
unix ipc message-queue ansi-c
asked Nov 20 '18 at 15:47
anonymousanonymous
326
add a comment |
As the title saying, I have a trouble with getting clear about the meaning of struct msgbuf's member variable "type"
struct msgbuf
{
long type;
char text[100];
};
I have no idea about when can it be used and for what, so can anyone give me a hand please....
unix ipc message-queue ansi-c
asked Nov 20 '18 at 15:47
anonymousanonymous
326
As the title saying, I have a trouble with getting clear about the meaning of struct msgbuf's member variable "type"
struct msgbuf
{
long type;
char text[100];
};
I have no idea about when can it be used and for what, so can anyone give me a hand please....
unix ipc message-queue ansi-c
unix ipc message-queue ansi-c
asked Nov 20 '18 at 15:47
anonymousanonymous
326
asked Nov 20 '18 at 15:47
anonymousanonymous
326
asked Nov 20 '18 at 15:47
anonymousanonymous
326
asked Nov 20 '18 at 15:47
anonymousanonymous
326
asked Nov 20 '18 at 15:47
anonymousanonymous
326
326
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
If the question is related msgsnd() and msgrcv() calls, then:
You can freely use it however you want.
Except one rule: it must be greater than zero.
msgrcv() call have an option (parameter msgtyp) to receive a message of wanted type from the queue. See more information from manpage of msgsnd:
If msgtyp is 0, then the first message in the queue is read.
If msgtyp is greater than 0, then the first message in the queue of
type msgtyp is read, unless MSG_EXCEPT was specified in msgflg, in
which case the first message in the queue of type not equal to msgtyp
will be read.
answered Nov 20 '18 at 16:07
SKiSKi
5,6141446
Thank you, I figured it out just after asking this question, hah
– anonymous
Nov 22 '18 at 2:29
add a comment |
Your Answer
StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53396656%2fansic-ipc-message-queue-what-is-the-types-meaning-in-struct-msgbuf%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
If the question is related msgsnd() and msgrcv() calls, then:
You can freely use it however you want.
Except one rule: it must be greater than zero.
msgrcv() call have an option (parameter msgtyp) to receive a message of wanted type from the queue. See more information from manpage of msgsnd:
If msgtyp is 0, then the first message in the queue is read.
If msgtyp is greater than 0, then the first message in the queue of
type msgtyp is read, unless MSG_EXCEPT was specified in msgflg, in
which case the first message in the queue of type not equal to msgtyp
will be read.
answered Nov 20 '18 at 16:07
SKiSKi
5,6141446
Thank you, I figured it out just after asking this question, hah
– anonymous
Nov 22 '18 at 2:29
add a comment |
If the question is related msgsnd() and msgrcv() calls, then:
You can freely use it however you want.
Except one rule: it must be greater than zero.
msgrcv() call have an option (parameter msgtyp) to receive a message of wanted type from the queue. See more information from manpage of msgsnd:
If msgtyp is 0, then the first message in the queue is read.
If msgtyp is greater than 0, then the first message in the queue of
type msgtyp is read, unless MSG_EXCEPT was specified in msgflg, in
which case the first message in the queue of type not equal to msgtyp
will be read.
answered Nov 20 '18 at 16:07
SKiSKi
5,6141446
Thank you, I figured it out just after asking this question, hah
– anonymous
Nov 22 '18 at 2:29
add a comment |
If the question is related msgsnd() and msgrcv() calls, then:
You can freely use it however you want.
Except one rule: it must be greater than zero.
msgrcv() call have an option (parameter msgtyp) to receive a message of wanted type from the queue. See more information from manpage of msgsnd:
If msgtyp is 0, then the first message in the queue is read.
If msgtyp is greater than 0, then the first message in the queue of
type msgtyp is read, unless MSG_EXCEPT was specified in msgflg, in
which case the first message in the queue of type not equal to msgtyp
will be read.
answered Nov 20 '18 at 16:07
SKiSKi
5,6141446
If the question is related msgsnd() and msgrcv() calls, then:
You can freely use it however you want.
Except one rule: it must be greater than zero.
msgrcv() call have an option (parameter msgtyp) to receive a message of wanted type from the queue. See more information from manpage of msgsnd:
If msgtyp is 0, then the first message in the queue is read.
If msgtyp is greater than 0, then the first message in the queue of
type msgtyp is read, unless MSG_EXCEPT was specified in msgflg, in
which case the first message in the queue of type not equal to msgtyp
will be read.
answered Nov 20 '18 at 16:07
SKiSKi
5,6141446
answered Nov 20 '18 at 16:07
SKiSKi
5,6141446
answered Nov 20 '18 at 16:07
SKiSKi
5,6141446
answered Nov 20 '18 at 16:07
SKiSKi
5,6141446
5,6141446
Thank you, I figured it out just after asking this question, hah
– anonymous
Nov 22 '18 at 2:29
add a comment |
Thank you, I figured it out just after asking this question, hah
– anonymous
Nov 22 '18 at 2:29
Thank you, I figured it out just after asking this question, hah
– anonymous
Nov 22 '18 at 2:29
Thank you, I figured it out just after asking this question, hah
– anonymous
Nov 22 '18 at 2:29
add a comment |
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53396656%2fansic-ipc-message-queue-what-is-the-types-meaning-in-struct-msgbuf%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
