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Linux Error Codes Errno.h

Macro: int ENFILE There are too many distinct file openings in the entire system. Link bubrek November 3, 2010, 11:46 am i have to make stronge grip on C++ please help me by sending handout/notes and practices Link Cancel reply Leave a Comment Name Email Macro: int ENETDOWN A socket operation failed because the network was down. Macro: int EDESTADDRREQ No default destination address was set for the socket. weblink

Portability Note: In many older Unix systems, this condition was indicated by EWOULDBLOCK, which was a distinct error code different from EAGAIN. Link Felix Frank October 21, 2010, 8:16 am Hi, good thinking, but this article desperately lacks a reference to perror. To save myself, and a few others, some time in the future... /usr/include/asm-generic/errno-base.h #ifndef _ASM_GENERIC_ERRNO_BASE_H #define _ASM_GENERIC_ERRNO_BASE_H #define EPERM 1 /* Operation not permitted */ #define ENOENT 2 /* No such Richard, Stevens; Stephen A., Rago (May 24, 2013). http://www.thegeekstuff.com/2010/10/linux-error-codes

Valid error numbers are all nonzero; errno is never set to zero by any system call or library function. Referee did not fully understand accepted paper UV lamp to disinfect raw sushi fish slices How should I deal with a difficult group and a DM that doesn't help? Publishing a mathematical research article on research which is already done? See Creating a Socket.

c linux errno share|improve this question edited Feb 18 '15 at 0:01 Peter Mortensen 10.3k1369107 asked Feb 2 '09 at 16:49 Barth 4,15194581 add a comment| 14 Answers 14 active oldest Most functions indicate that they detected an error by returning a special value, typically NULL for functions that return pointers, and −1 for functions that return integers. You have to detect the failure and handle the error. This error never occurs on GNU/Hurd systems.

You can use the select function to find out when the pending operation has completed; see Waiting for I/O. ISBN978-0321637734. You can choose to have functions resume after a signal that is handled, rather than failing with EINTR; see Interrupted Primitives. you could try here Macro: int EINTR Interrupted function call; an asynchronous signal occurred and prevented completion of the call.

You have to include errno.h header file to use external variable errno. Library functions store only values greater than zero. In C programming language, return values represents success or failure. Macro: int ENEEDAUTH ???

You really need to know what error number 17 means. Macro: int ESHUTDOWN The socket has already been shut down. Macro: int EBACKGROUND On GNU/Hurd systems, servers supporting the term protocol return this error for certain operations when the caller is not in the foreground process group of the terminal. This error is never generated by GNU/Hurd systems, but it can result from an operation to an NFS server running another operating system.

However, on (very) old UNIX systems, there may be no and the declaration is needed. have a peek at these guys GNU Project. 2014-02-08. All rights reserved | Terms of Service virtsync errno.h - C Error Codes in Linux All the Linux/C error codes are listed below. But you gave nothing special more than formatting the contents of the linux errno headers.

Retrieved 27 February 2015. In multithreaded programs it is a macro executing a function that returns the last error of the caller thread. In C programming language, there is an external variable called "errno". http://cygnussoft.com/linux-error/linux-error-25-on-boot-up.html I will be posting instruction guides, how-to, troubleshooting tips and tricks on Linux, database, hardware, security and web.

Macro: int EREMOTE An attempt was made to NFS-mount a remote file system with a file name that already specifies an NFS-mounted file. (This is an error on some operating systems, If the value of errno should be preserved across a library call, it must be saved: if (somecall() == -1) { int errsv = errno; printf("somecall() failed\n"); if (errsv == ...) Macro: int EGRATUITOUS This error code has no purpose.

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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 more hot questions question feed lang-c about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation Bash 101 Hacks eBook Sed and Awk 101 Hacks eBook Vim 101 Hacks eBook Nagios Core 3 eBook Copyright © 2008–2015 Ramesh Natarajan. Macro: int ENOTEMPTY Directory not empty, where an empty directory was expected.

This article might be a handy reference for you, when you encounter an error number and you would like to know what it means. Macro: int ENETRESET A network connection was reset because the remote host crashed. fork can return this error. http://cygnussoft.com/linux-error/linux-error-correction.html Macro: int EAGAIN Resource temporarily unavailable; the call might work if you try again later.

Macro: int EPIPE Broken pipe; there is no process reading from the other end of a pipe. Macro: int ENXIO No such device or address. This is a “file doesn’t exist” error for ordinary files that are referenced in contexts where they are expected to already exist. share|improve this answer edited Oct 16 '13 at 12:59 user283145 answered Feb 2 '09 at 16:51 schnaader 34.3k570104 add a comment| up vote 6 down vote There's a few useful functions

Feel free to send those people a nice peer beating. –allyourcode Nov 25 '12 at 7:06 3 The problem is that perror doesn't tell you which macro equivalent the error share|improve this answer edited Feb 18 '15 at 0:09 Peter Mortensen 10.3k1369107 answered Feb 2 '09 at 16:50 dsm 8,3672963 1 I hate how the unix documentation don't associate constant In such cases, a successful return can be distinguished from an error return by setting errno to zero before the call, and then, if the call returns a status that indicates Some functions that must always block (such as connect; see Connecting) never return EAGAIN.

Tweet >Add your comment If you enjoyed this article, you might also like.. 50 Linux Sysadmin Tutorials 50 Most Frequently Used Linux Commands (With Examples) Top 25 Best Linux Performance share|improve this answer edited Jul 10 '13 at 0:47 user283145 answered Feb 2 '09 at 17:23 Commodore Jaeger 17.2k44241 14 I'd recommend avoiding strerror_r because: 1) strerror is guaranteed reentrant Macro: int EMLINK Too many links; the link count of a single file would become too large. The header file also defines macros that expand to integer constants that represent the error codes.

share|improve this answer edited Feb 17 '15 at 23:56 Peter Mortensen 10.3k1369107 answered Feb 2 '09 at 16:51 Johannes Weiß 29.4k867108 add a comment| up vote 1 down vote It means: Macro: int ENOBUFS The kernel’s buffers for I/O operations are all in use. A function returns this error when certain parameter values are valid, but the functionality they request is not available. Macro: int ENAMETOOLONG Filename too long (longer than PATH_MAX; see Limits for Files) or host name too long (in gethostname or sethostname; see Host Identification).

The following table shows list of error numbers and its descriptions in Linux operation system ERROR CODE TABLE Error number Error Code Error Description 1 EPERM Operation not permitted 2 ENOENT Macro: int ENETUNREACH A socket operation failed because the subnet containing the remote host was unreachable. more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed Macro: int ED The experienced user will know what is wrong.

Bibliography[edit] W. Every library function that returns this error code also generates a SIGPIPE signal; this signal terminates the program if not handled or blocked. You have to detect the failure and handle the error. In multithreaded programs it is a macro executing a function that returns the last error of the caller thread.