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A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/. 2016-03-15 ERRNO(3) Copyright and license for this manual page HTML If you specify the SA_RESTART flag, return from that handler will resume a primitive; otherwise, return from that handler will cause EINTR. So it seems that only blocking functions may fail because of EINTR, including read() and write(), yet if these functions never block, they also will never fail with EINTR and if Can we say "He is accountable but not blamable" ? http://dssoundware.com/error-codes/eintr-error-4.php

This trick is even applicable in libraries. Browse other questions tagged nonblocking eintr or ask your own question. I've misunderstood you. Macro: int EMFILE The current process has too many files open and can’t open any more. http://www.gnu.org/s/libc/manual/html_node/Error-Codes.html

Eintr Errno

Similarly, if write is interrupted after transferring some of the data in an application's buffer, the operation system could either fail the system call with errno set to EINTR or allow students who have girlfriends/are married/don't come in weekends...? Below is a list of the symbolic error names that are defined on Linux. Reply Options Unfold by Alex (guest), 21 Oct 2014 13:40 Fold Ulf Samuelsson (guest) 11 Nov 2014 15:08 Receive is the easy case.

Third, even EINTR is not completely water-proof. Macro: int ENOBUFS The kernel’s buffers for I/O operations are all in use. Is there any guarantee that you cannot get EINTR if the packet has been transmitted? Eintr Signal Not the answer you're looking for?

it's fork()'s error. Eintr Linux Valid error numbers are all nonzero; errno is never set to zero by any system call or library function. Where (or to whom) do sold items go? http://250bpm.com/blog:12 In it, you'll get: The week's top questions and answers Important community announcements Questions that need answers see an example newsletter By subscribing, you agree to the privacy policy and terms

Looking for a term like "fundamentalism", but without a religious connotation Download manager that automatically continues "failed" downloads What is the difference between SAN and SNI SSL certificates? Linux Errno Example EDIT: Ambroz Bizjak suggests to use pselect (and similar functions) to deal with the race condition above. 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. If the signal handler returns, the system faces the question: what should happen next?

Eintr Linux

ENOBUFS No buffer space available (POSIX.1 (XSI STREAMS option)) ENODATA No message is available on the STREAM head read queue (POSIX.1) ENODEV No such device (POSIX.1) ENOENT No such file or http://man7.org/linux/man-pages/man3/errno.3.html Reply Options Unfold by Nico (guest), 16 Dec 2012 22:05 Fold martin_sustrik 16 Dec 2012 22:07 Except that messing with signal handlers is not an option when you are implementing a Eintr Errno C libraries in many older Unix systems have EWOULDBLOCK as a separate error code. Eintr Select POSIX.1 semantics for interrupted reads and writes changed with the 2001 version of the standard.

http://www.ibm.com/developerworks/linux/library/l-reent.html Cheers! Ouch. Macro: int EFAULT Bad address; an invalid pointer was detected. Signal handlers are set by the main module and should not be changed randomly in the background by the libraries. Linux Kernel Error Codes

If I know that I want to ignore EINTR in certain operations, I can do it with this call retry (goto again). thank u! Macro: int EROFS An attempt was made to modify something on a read-only file system. navigate here Macro: int ECONNRESET A network connection was closed for reasons outside the control of the local host, such as by the remote machine rebooting or an unrecoverable protocol violation.

errno is thread-local; setting it in one thread does not affect its value in any other thread. Posix Error Codes Macro: int EPROTOTYPE The socket type does not support the requested communications protocol. Macro: int ENETRESET A network connection was reset because the remote host crashed.

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My question is: Does this apply for non-blocking calls, e.g, set socket to O_NONBLOCK? This condition never arises on GNU/Hurd systems. You can use select to find out when the operation will be possible; see Waiting for I/O. Eintr Read Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the

The morale of this story is that common advice to just restart the blocking function when EINTR is returned doesn't quite work: volatile int stop = 0; void handler (int) { How to insert equation numbers with lstlisting? You use non-blocking sockets and in the select() you always monitor your sockets and the read end of the pipe. If the value equals -1, that indicates a failure and errno should be set to show what kind of failure.

This error means you got lucky and the system noticed; it might just hang. fork can return this error. As a result, the signal handler can only execute during the pselect(), so it is safe to only check the flag after pselect() returns. When do I preferably check for EINTR and repeat the function call?

Some of these error codes can’t occur on GNU systems, but they can occur using the GNU C Library on other systems. The problem here is that you have to somehow force the blocking function to exit when signal happens. perror function : We need to pass some string . Do "accountable", "responsible", "answerable" imply "blamable"?

In any case, I insist that listing2 and listing3 have no different behavior. Some functions that must always block (such as connect; see Connecting) never return EAGAIN. Macro: int EPROGMISMATCH ??? 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

In all the example programs I have, sometimes it is done, e.g. How can I tether a camera to a laptop, to show its menus and functions for teaching purposes? Reply Options Unfold by Nico (guest), 16 Dec 2012 22:04 Fold Nico (guest) 16 Dec 2012 22:05 FYI, this technique goes back a long time. Browse other questions tagged c libraries signals posix or ask your own question.

Your read call just failed, because it was interrupted by a signal. Need help remembering the name of an adventure more hot questions question feed lang-c about us tour help blog chat data legal privacy policy work here advertising info mobile contact us By Kross7 in forum C++ Programming Replies: 12 Last Post: 04-12-2007, 03:25 PM Personal Program that is making me go wtf? This way, the caller can decide if they want to retry my function, right? (Or perhaps my understanding of signals is flawed?) c libraries signals posix share|improve this question edited Dec