Socket disconnect detection and re-connect under Linux

One using the return value of the Select function (for situations where there must be data interaction within a certain time period)

#include <sys/select.h>

int select (int maxfd + 1, fd_set *readset, Fd_set *writeset, fd_set *exceptset, const struct Timeval * Timeou　　T); Maximum file description Multibyte 1, check readability, check for writeable check out-of-band data, a pointer to the TIMEVAL structure, to determine the maximum time for select to wait I/O.       If it is empty, it will wait forever. 　　　　　　　　　　　　　　　　　 Definition of Timeval structure: struct Timeval {long tv_sec;//seconds long tv_usec;//microseconds }

Socket disconnect detection and re-connect under Linux