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Any library function can alter the value stored before return, whether or not they detect errors. c linux errno share|improve this question asked Dec 9 '13 at 15:31 oldnavy 2816 add a comment| 3 Answers 3 active oldest votes up vote 7 down vote It is defined One way of figuring out is to trace an invocation of the compiler. But im supposed to install ethereal network only... http://globalinfoindex.com/linux-error/linux-error-header.php

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. Browse other questions tagged c linux errno or ask your own question. Macro: int ENEEDAUTH ??? This error happens on operations that are supposed to manipulate child processes, when there aren’t any processes to manipulate. https://en.wikipedia.org/wiki/Errno.h

Linux Errno Example

Reply Link Nix Craft January 16, 2014, 7:21 pmInstall ncurses-devel. A few functions require the caller to preset errno to zero and test it afterwards to see if an error was detected. The system does not guarantee that it will notice all such situations.

When you call aio_cancel, the normal result is for the operations affected to complete with this error; see Cancel AIO Operations. This often indicates a cycle of symbolic links. What went wrong and what could have been done better? Strerror Reply Link Edward April 17, 2012, 6:23 amOh!

The file was the wrong type for the operation, or a data file had the wrong format. Posix Error Codes Macro: int EPROCUNAVAIL ??? Macro: int ENOLCK No locks available. a fantastic read The errno macro expands to an lvalue with type int, sometimes with the extern and/or volatile type specifiers depending upon the platform,[2] containing the last error code generated in any function

Macro: int ENOTSUP Not supported. Errno C++ 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. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own. The header file also defines macros that expand to integer constants that represent the error codes.

Posix Error Codes

Having a problem installing a new program? Macro: int ECONNREFUSED A remote host refused to allow the network connection (typically because it is not running the requested service). Linux Errno Example Example linux c/c++ program for i2c1Different realloc behaviour in linux and osx1Adding paths to header files in the Linux kernel1832How to find all files containing specific text on Linux?0can't create a Errno.h In C Ubuntu Logo, Ubuntu and Canonical Canonical Ltd.

Retrieved 2015-05-08. ^ Stevens & Rago 2013, p.14. weblink Macro: int ERESTART Macro: int ECHRNG Macro: int EL2NSYNC Macro: int EL3HLT Macro: int EL3RST Macro: int ELNRNG Macro: int EUNATCH Macro: int ENOCSI Macro: int EL2HLT Macro: int EBADE Macro: For your information, I'm running Ubuntu 7.10 with the latest Linux kernel version 2.6.22 and has perform all available updates. Macro: int ENOTDIR A file that isn’t a directory was specified when a directory is required. How To Use Errno

From the FAQ: Quote: Q 1.2: What's up with the name change? Retrieved 2013-09-12. ^ errno.h:system error numbers–Base Definitions Reference, The Single UNIX® Specification, Issue 7 from The Open Group ^ "Error numbers - cppreference.com". Here is a sample command to compile and use ncurses: $ gcc -o output input.c -lncurses
$ ./output Sysadmin because even developers need heroes!!! navigate here Retrieved 2015-05-08. ^ Stevens & Rago 2013, p.14.

I occasionally google C error codes, but always end up grepping through /usr/include to find the answer. Errno To String Some of these are marked POSIX.1, indicating that the name is defined by POSIX.1-2001, or C99, indicating that the name is defined by C99. This error never occurs on GNU/Hurd systems.

The GNU C Library (glibc).

Macro: int EPROGMISMATCH ??? What can I do about a rock climbing ban? More power nixCraft! Errno.h Linux Kernel Macro: int EINPROGRESS An operation that cannot complete immediately was initiated on an object that has non-blocking mode selected.

This indicates an internal confusion in the file system which is due to file system rearrangements on the server host for NFS file systems or corruption in other file systems. Macro: int EPROCLIM This means that the per-user limit on new process would be exceeded by an attempted fork. This left the project in an awkward position. his comment is here Every library function that returns this error code also generates a SIGPIPE signal; this signal terminates the program if not handled or blocked.

Macro: int ESRCH No process matches the specified process ID. Macro: int EADDRNOTAVAIL The requested socket address is not available; for example, you tried to give a socket a name that doesn’t match the local host name. E2BIG Argument list too long (POSIX.1) EACCES Permission denied (POSIX.1) EADDRINUSE Address already in use (POSIX.1) EADDRNOTAVAIL Address not available (POSIX.1) EAFNOSUPPORT Address family not supported (POSIX.1) EAGAIN Resource temporarily unavailable Macro: int ENOSPC No space left on device; write operation on a file failed because the disk is full.

A world with a special political system Can a un-used NONCLUSTERED INDEX still enhance query speed? how do I get the latest version of the header files? It indicates that the shortage is expected to pass, so your program can try the call again later and it may succeed. Macro: int EPROGUNAVAIL ???

Macro: int ENOTEMPTY Directory not empty, where an empty directory was expected. Vim: what are all the possible swapfile extensions? See Socket Addresses. help needed urgently .

Macro: int ENOMEM No memory available. Bibliography[edit] W. You can use select to find out when the operation will be possible; see Waiting for I/O. Macro: int EAFNOSUPPORT The address family specified for a socket is not supported; it is inconsistent with the protocol being used on the socket.

strtol("0xfffffffff",NULL,0) on systems with a 32-bit wide long EILSEQ (Required since 1994 Amendment 1 to C89 standard)[3] Results from an illegal byte sequence, e.g. strtol("0xfffffffff",NULL,0) on systems with a 32-bit wide long EILSEQ (Required since 1994 Amendment 1 to C89 standard)[3] Results from an illegal byte sequence, e.g. Macro: int EMSGSIZE The size of a message sent on a socket was larger than the supported maximum size. You get this error when you try to transmit data over a socket, without first specifying a destination for the data.

Macro: int EILSEQ While decoding a multibyte character the function came along an invalid or an incomplete sequence of bytes or the given wide character is invalid. Macro: int EWOULDBLOCK In the GNU C Library, this is another name for EAGAIN (above).