FD_CLR(fd, &fdset) removes the socket descriptor fd from the socket descriptor set fdset. FD_ISSET(fd, &fdset) returns nonzero if socket descriptor fd is a member of fdset. Otherwise, it returns a 0. FD_SET(fd, &fdset) adds socket descriptor fd to fdset. FD_SETSIZE is defined in as the number of socket descriptors that a process

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I set up a squid proxy inside a docker-machine using the datadog/squid image, when I access the cache.log file inside the container I see the following at the end of the logs: 2017/11/06 21:45:10|

__WSAFDIsSet function (winsock.h) - Win32 apps | Microsoft® Pointer to an fd_set structure containing the set of socket descriptors. The __WSAFDIsSet function determines whether the socket specified in the fd parameter is a member of that set. Return value. None. Remarks. Windows Phone 8: This function is supported for Windows Phone Store apps on Windows Phone 8 and later.

def get_high_socket_fd(self): if WIN32: # The child process will not have any socket handles, so # calling socket.fromfd() should produce WSAENOTSOCK even # if there is a handle of the same number. return socket.socket().detach() else: # We want to produce a socket with an fd high enough that a # freshly created child process will not have any

In Unix and related computer operating systems, a file descriptor (FD, less frequently fildes) is an abstract indicator used to access a file or other input/output resource, such as a pipe or network socket. File descriptors form part of the POSIX application programming interface. socket.fromfd (fd, family, type, proto=0) ¶ Duplicate the file descriptor fd (an integer as returned by a file object’s fileno() method) and build a socket object from the result. Address family, socket type and protocol number are as for the socket() function above. The file descriptor should refer to a socket, but this is not checked int is_net_socket(fd) { return close(dup(fd)) != 0; } Warning: untested theory with untested dependency ;-) Note that this would return misleading results if you run out of fd's. Another side effect is that if it is a file it will be flushed and its directory entry updated.