c - unistd.h and c99 on Linux -

-

यह सरल। सी फ़ाइल: 

  #include & lt; unistd.h & gt; शून्य परीक्षण () {चार स्ट्रिंग [40]; gethostname (स्ट्रिंग, 40); }

... सामान्य रूप से संकलित होने पर, ठीक काम करता है: 

  $ cc -Wall -c -o tmp.o tmp.c $

... परन्तु C99 मोड में संकलित होने पर, एक चेतावनी दी जाती है: 

  $ cc -Wall -std = c99 -c -o tmp.o tmp.c Tmp.c: फ़ंक्शन `टेस्ट ': tmp.c: 5: चेतावनी: फ़ंक्शन` gethostname' $

के परिणामस्वरूप घोषणा। परिणामी। ओ फ़ाइल ठीक है, और लिंक जोड़ना है मैं सिर्फ चेतावनी से छुटकारा चाहूंगा मैं इसे अपने ही .h फाइल में घोषणाओं के जरिए इसे प्राप्त कर सकता हूं।

सीएम 99 के बारे में क्या है जिसका मतलब है कि unistd.h में घोषणाएं शामिल नहीं हुई हैं? सीएएम के निकोलस को छोड़ने के बाद क्या यह दूर किया जा सकता है?

मुझे अन्य मानक लिब्स के लिए एक ही समस्या दिखाई देती है।

gethostname ()

से आदमी gethostname

:

फ़ीचर टेस्ट मैक्रो के लिए आवश्यकताएँ glibc (देखें feature_test_macros (7)): 

  gethostname (): _BSD_SOURCE || _XOPEN_SOURCE & gt; = 500 sethostname (): _BSD_SOURCE || (_XOPEN_SOURCE & amp; _XOPEN_SOURCE & lt; 500)

ऐसा: 

  #define _BSD_SOURCE #include & lt; unistd.h & gt; शून्य परीक्षण () {चार स्ट्रिंग [40]; gethostname (स्ट्रिंग, 40); }

धूर्त विवरण:

यदि आप -std-c99 विकल्प निर्दिष्ट नहीं करते हैं, तो features.h (जो कि unistd.h द्वारा निहित है) _BSD_SOURCE को सेट करने के लिए डिफ़ॉल्ट रूप से gethostname () शामिल हो जाता है हालांकि, -std = c99 निर्दिष्ट करने से कंपाइलर स्वतः __ STRICT_ANSI __ को परिभाषित करता है, जिसके बदले में features.h परिभाषित नहीं करने के लिए _BSD_SOURCE , जब तक कि आप इसे अपनी स्वयं की फीचर मैक्रो परिभाषा (ऊपर के रूप में) से बाध्य नहीं करते।


Comments

Post a Comment

Popular posts from this blog

paypal - How to know the URL referrer in PHP? -

-
I'm new to integrating PayPal with sites, so easily from the service I can use Can the available method be? What am I trying to do, when the user clicks on "Return to my website", I want my return URL to know that the referrer is PayPal so I can send it automatically to the homepage . how to do this? I tried $ _ SERVER ['HTTP_REFERER'] but it does not seem like anything. During the IPN conversation I set the cookie and session (though I am not sure whether I am correcting it or doing this right), but on returning to my website, it does not seem to recognize any session . If I use it by using $ _ SERVER ['HTTP_REFERER'] , then I'm afraid it's a security risk, is not it? If so, is there any other way I remember? help please. Should you really know the referrer? Set the PayPal Return URL to a "secret" URL which is always redirected to the homepage. If someone reaches there and gets redirected without coming from PayPal, then ...
Read more

oauth - Facebook OAuth2 Logout does not remove fb_ cookie -

-
This is used to work so I'm not sure what's wrong the user just logs in to Facebook properly Is capable of Logging problem. I log out the user logout by redirecting them to the php script. $ facebook-> GetLogoutUrl (); When users click on that link, they are logged out from the Facebook page. However, when they return to my site, I find that the FB_ cookie is still there. PHP SDK still gives user FB session details. The strange thing is that www.facebook.com shows that I am already logged out of Facebook. What can be wrong here? Thanks, I've been stumped: (. OK, finally, what did I do? > GetLogoutUrl () with a next = address url on my logout script which will remove the Facebook cookie by setSession (null) .
Read more

wpf - Line breaks and indenting for the XAML of a saved FlowDocument? -

-
Is there a way to format XAM generated when a flow document is saved? Currently, all of this is run simultaneously in one line, and I want to break it into my elements, with line break and indenting it makes it a little easier to read. Here is the code I'm using to save a FlowDocument in a WPF RichTextBox as a XAML file: // entire document around TextRange textRange Create a TextRange side = new TextRange (myRichTextBox.Document.ContentStart, myRichTextBox.Document .contentEnd); // save the file using the file (file stream fs = file. Create (filename)) {textRange.Save (fs, DataFormats.Xaml); } Savings work fine, but as I mentioned, JPAM has been generated, all this goes together, no indentation or line breaks for its various elements Is: & lt; Section xmlns = "http://schemas.microsoft.com/winfx/2006/xaml/presentation" xml: space = "preserve" Tekstelinement = "left" Lainhait = "auto" Hashipineshn = enabled = "false...
Read more