Windows _read

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Use the feof or ferror function to distinguish a read error from an end-of-file condition. If size or count is 0, fread returns 0 and the buffer contents are unchanged.

If stream or buffer is a null pointer, fread invokes the invalid parameter handler, as described in Parameter Validation. The fread function reads up to count items of size bytes from the input stream and stores them in buffer. The file pointer associated with stream if there is one is increased by the number of bytes actually read.

If the given stream is opened in text mode , Windows-style newlines are converted into Unix-style newlines. The replacement has no effect on the file pointer or the return value.

The file-pointer position is indeterminate if an error occurs. The value of a partially read item cannot be determined. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Feedback will be sent to Microsoft: By pressing the submit button, your feedback will be used to improve Microsoft products and services. Privacy policy. Returns 0 if successful. Returns -1 to indicate an error.

On error, errno is set to one of these values:. EINVAL , which indicates that either the array pfds is a null pointer or that an invalid value for textmode was passed in. A pipe resembles a file because it has a file pointer, a file descriptor, or both, and it can be read from or written to by using the Standard Library input and output functions.

However, a pipe does not represent a specific file or device. Instead, it represents temporary storage in memory that is independent of the program's own memory and is controlled entirely by the operating system. The program can use both sides of the pipe or close the one that it doesn't need. This eliminates the need to create temporary files to pass information to other programs. Connect and share knowledge within a single location that is structured and easy to search.

MSDN says closesocket is the function to use. In Winsock applications, a socket descriptor is not a file descriptor and must be used with the Winsock functions. Sockets are represented by standard file descriptors in Berkeley Sockets, so the close function can be used to close sockets as well as regular files.

While nothing in Windows Sockets prevents an implementation from using regular file handles to identify sockets, nothing requires it either. On Windows, sockets must be closed by using the closesocket routine. On Windows, using the close function to close a socket is incorrect and the effects of doing so are undefined by this specification.

However, even despite the above, some of the Windows file functions might work with sockets in practice:. MSDN's overview of socket handles states:. A socket handle can optionally be a file handle in Windows Sockets 2. The short answer is no. Sockets handles on Windows are not file handles as they are on Unix. But that's likely where it ends. Just look at the source of read and write as seen in the CRT sources.

Socket error codes may not bubble to the file API as you think. So if your call to write hits a socket error, it might try to map the return value via GetLastError, which still returns success. In Windows NT, however, it appears they may usually be one and the same. The problem is, the first argument is an RTL-specific handle, not an operating system file handle.