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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. It means you should call curl_multi_perform again without doing select() or similar in between. Macro: int EPROTOTYPE The socket type does not support the requested communications protocol. In C programming language, there is an external variable called "errno".

The return status of AND and OR lists is the exit status of the last command executed in the list." Again, we can use the true and false commands to see The values are always the same, on every operating system. Link Felix Frank October 21, 2010, 8:16 am Hi, good thinking, but this article desperately lacks a reference to perror. Among the APIs subsequently listed are write() and writev(2).

You might decide that all your functions return a status which is testable, and the value is returned via a pointer argument. if f < 0 { return 0, fmt.Errorf("math: square root of negative number %g", f) } In many cases fmt.Errorf is good enough, but since error is an interface, you can Portability Note: In many older Unix systems, this condition was indicated by EWOULDBLOCK, which was a distinct error code different from EAGAIN. EPERM The operation was prevented by a file seal; see fcntl(2).

CURLSHE_BAD_OPTION (1) An invalid option was passed to the function. Not recommended. Is there another solution that doesn't involve changing the interface to the function? In the United States is racial, ethnic, or national preference an acceptable hiring practice for departments or companies in some situations?

This problem was fixed in Linux 3.14. This condition is detected by the exec functions; see Executing a File. See CURLOPT_FTPPORT. Macro: int ENOTEMPTY Directory not empty, where an empty directory was expected.

Macro: int EHOSTDOWN The remote host for a requested network connection is down. Thus, your program will never actually see EPIPE unless it has handled or blocked SIGPIPE. Macro: int EEXIST File exists; an existing file was specified in a context where it only makes sense to specify a new file. On Linux, write() (and similar system calls) will transfer at most 0x7ffff000 (2,147,479,552) bytes, returning the number of bytes actually transferred. (This is true on both 32-bit and 64-bit systems.) BUGS

This is a “file doesn’t exist” error for ordinary files that are referenced in contexts where they are expected to already exist. The specified time-out period was reached according to the conditions. This is serious badness and things are severely screwed up if this ever occurs. Macro: int EPROCUNAVAIL ???

In the end I decided that if a function is intended to return some data, an error can only be returned through an error parameter. Data is written to a file by calling the write function. CURLMcode This is the generic return code used by functions in the libcurl multi interface. CURLE_WRITE_ERROR (23) An error occurred when writing received data to a local file, or an error was returned to libcurl from a write callback.

Macro: int ENETDOWN A socket operation failed because the network was down. else ...use returned value... Macro: int EFAULT Bad address; an invalid pointer was detected. The only way to be sure is to call fsync(2) after you are done writing all your data.

Set your limit with CURLOPT_MAXREDIRS. So a C programmer can check the returned values and can take appropriate action depending on the return value. Why they occur and possibly what you can do to fix the problem are also included. The following C code snippet tries to open a file through open system call.

Also consider curl_share_strerror. High-level I/O functions calling write See also[edit] read (system call) fwrite getchar fprintf sync (Unix) References[edit] ^ http://www.unix.com/man-page/FreeBSD/2/write/ Manual page for Write ^ https://www.gnu.org/s/hello/manual/libc/I_002fO-Primitives.html#I_002fO-Primitives I/O Primitives ^ http://pubs.opengroup.org/onlinepubs/007904875/functions/write.html ^ https://www.gnu.org/s/hello/manual/libc/Error-Codes.html GNU c error-handling share|improve this question edited Mar 31 '11 at 22:01 asked Jan 23 '11 at 20:35 Rupert Madden-Abbott 5,988104055 add a comment| 7 Answers 7 active oldest votes up vote 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.

The perror function is infinitely useful when dealing with errno (but sadly renders the point of this huge table mute). CURLE_OPERATION_TIMEDOUT (28) Operation timeout. Macro: int EMSGSIZE The size of a message sent on a socket was larger than the supported maximum size. Improving the error exit function There are a number of improvements that we can make to the error_exit function.

Don't let this happen to you! For a connectionless socket (for datagram protocols, such as UDP), you get EDESTADDRREQ instead. f, err := os.Open("filename.ext") if err != nil { log.Fatal(err) } // do something with the open *File f You can get a lot done in Go knowing just this about