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Unix Error Eintr


The system call blocks. Cache coherence related questions are kind of out of scope of the article. Macro: int ERANGE Range error; used by mathematical functions when the result value is not representable because of overflow or underflow. This is fine for accept, along with the functions such as read, write, select and open. http://crimsonskysoftware.com/unix-error/unix-error-110.html

EDIT: Please note that to make blocking fuctions like recv return EINTR you may have to use sigaction() with SA_RESTART set to zero instead of signal() on some operating systems. RudoffSnippet view - 2004View all »Common terms and phrasesAF_INET ancillary data application argument bind blocked broadcast caller checksum child client and server connected socket connfd const daemon datalink default define descriptor How is the 3rd listing supposed to behave differently from the 2nd one?? errno is thread-local; setting it in one thread does not affect its value in any other thread. http://www-numi.fnal.gov/offline_software/srt_public_context/WebDocs/Errors/unix_system_errors.html

Eintr Errno

See Creating a Socket. Every library function that returns this error code also generates a SIGPIPE signal; this signal terminates the program if not handled or blocked. Remember that file descriptors include things like sockets.ENLINK -- The function call would cause a file to have more than LINK_MAX links.ENAMETOOLONG -- You've created a path name longer than PATH_MAX, But I have cases when the EALREADY error code was returned for a blocking socket (this is the very point I'm arguing about).

developerWorks technical events and webcasts: Stay current with developerWorks technical events and webcasts. In any case, I insist that listing2 and listing3 have no different behavior. That seems even worse than doing it the other way round. Linux Kernel Error Codes This happens not only when you use link (see Hard Links) but also when you rename a file with rename (see Renaming Files).

Options Unfold by Ambroz Bizjak (guest), 07 Nov 2012 12:35 Fold Ambroz Bizjak (guest) 07 Nov 2012 12:37 By "check if signal is pending" I mean check the flag, not some Eintr Linux Linux adopts the pleasant “Liberal Behavior” I have described. For example, if you call setpgid() on a system without job control, you'll get an ENOSYS error.ENOTDIR -- The specified path name needs to be a directory, but it isn't. This error is never generated by GNU/Hurd systems, but it can result from an operation to an NFS server running another operating system.

On GNU/Hurd systems, this error can happen for many calls when the object does not support the particular operation; it is a generic indication that the server knows nothing to do Eintr Signal For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Most people agree that SA_RESTART does not dispense you from testing EINTR everywhere, if you want to be safe. Check out how this page has evolved in the past.

Eintr Linux

Solutions? http://cboard.cprogramming.com/c-programming/124120-errno-==-eintr-means-what-thank-u.html All rights reserved. Eintr Errno To give you a real world example of incorrectly implemented blocking function, here's a problem we encountered with ZeroMQ couple of years ago: Ctrl+C did not work when ZeroMQ library was Eintr Select They can be used to index into the sys_errlist array and output with perror.

I found an explanation and a useful macro for primitives in GNU libc documentation: TEMP_FAILURE_RETRY Example: TEMP_FAILURE_RETRY (read_return = read((int)example_fifo, buffer, (size_t)n)); if (read_return==-1){ fprintf(stderr, "reader.c: read_fifo: read(): %s \n", strerror(errno)); http://crimsonskysoftware.com/unix-error/unix-error-6739.html I've programmed on platforms that had E_OK, EOK, and ENOERROR in their errno.h, and I've seen loads of code that includes something like Listing 4. Reply Options Unfold by martin_sustrik, 07 Nov 2012 09:58 Fold Ambroz Bizjak (guest) 07 Nov 2012 11:18 set file descriptor to non-blocking; sigprocmask() to block SIGINT; if (stop) { // handle However, consider this example (pretty common ZeroMQ use case): User calls zmq_recv (a blocking function) to get some work. Eintr Error

  • How do really talented people in academia think about people who are less capable than them?
  • Can the editor of a book add citations of individual chapters to his own citation count?
  • perror( "Error opening file" ); printf( "Error opening file: %s\n", strerror( errno ) ); } return EXIT_SUCCESS; }When you run this program, you'll see something like Listing 2.Listing 2.
  • really helpful.
  • When you get this error, you can be sure that this particular function will always fail with ENOSYS unless you install a new version of the C library or the operating
  • Or give up on portability and use some API that solves this proble, like, say, Solaris event ports (just post an event from the handler, or put the port into alert
  • But it's not, so you can't.
  • Macro: int EBADF Bad file descriptor; for example, I/O on a descriptor that has been closed or reading from a descriptor open only for writing (or vice versa).

SEE ALSO top errno(1), err(3), error(3), perror(3), strerror(3) COLOPHON top This page is part of release 4.08 of the Linux man-pages project. Is there any guarantee that you cannot get EINTR if the packet has been transmitted? In BSD and GNU, the number of open files is controlled by a resource limit that can usually be increased. Check This Out Hosting by jambit GmbH.

Macro: int EISDIR File is a directory; you cannot open a directory for writing, or create or remove hard links to it. Read Eintr This can mean that the device file was installed incorrectly, or that the physical device is missing or not correctly attached to the computer. Richard Stevens,Bill Fenner,Andrew M.

By default, you have the SA_RESTART behavior, so you don't have to worry about EINTR, if you don't play with signals.

Macro: int EPROCUNAVAIL ??? In order to become a pilot, should an individual have an above average mathematical ability? SXA Page Design vs Page Standard Values vs Page Branch Template What are the German equivalents of “First World War”, “World War I”, and “WWI”? Eintr Socket This seems to be what Linux does (whether this is against the Spec, is, as I say, a matter of interpretation, though most people seem to think that indeed it is).

Solaris adopts the “Unforgiving Behavior” that seems to be the literal interpretation of the Spec. Let us call this the “Unforgiving Behavior” in what follows (I will later explain that this is how Solaris behaves). By Sinensis in forum C Programming Replies: 2 Last Post: 10-21-2008, 04:40 PM Need help with my code By brietje698 in forum C++ Programming Replies: 2 Last Post: 07-31-2007, 02:54 PM this contact form It is probably a good idea to delay for a few seconds before trying it again, to allow time for other processes to release scarce resources.

When do I preferably check for EINTR and repeat the function call? If the connection cannot be established immediately and O_NONBLOCK is not set for the file descriptor for the socket, connect() shall block for up to an unspecified timeout interval until the thank u! Then he processes the work.

fraction line in French Is there a formal way of saying 'hog'? Besides that, this doesn't seem to work anyway. If you're lucky, the function's man page lists all of its possible return values and what they mean in the context of this particular function. The first two listings are trying to explain why EINTR error exists at all and explore what would happen if it doesn't exist.

Reply Options Unfold by martin_sustrik, 11 Nov 2014 16:07 Fold Iurie Solomon (guest) 28 Mar 2016 17:21 in alternative, u can use the fcntl (filedes, F_SETFL, new_flags) with the O_NONBLOCK macro: He is one of the IETF's Routing Area Directors, responsible for approving all routing-related documents that get published as RFCs. However, interrupting the program using Ctrl+C kills it immediately, which may be a problem if we want to do some clean-up, for example, release some system-wide resources. Macro: int ENOSPC No space left on device; write operation on a file failed because the disk is full.

So, I think the example should be expanded showing how to install the SIGINT handler by using sigaction.