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#include <sys/select.h>
#include <sys/time.h>

...
fd_set rset_backup, rset, wset_backup, wset;  // Declare the descriptor sets
int maxfdp = 0;
struct timeval timeout_backup, timeout;
int retval;

/* The descriptor sets */
FD_ZERO(&rset_backup);  // Clear all bits
FD_SET(fd_read1, &rset_backup);  // Set the bit
FD_SET(fd_read2, &rset_backup);

FD_ZERO(&wset);
FD_SET(fd_write1, &wset_backup);
// FD_CLR(fd, &wset_backup);   // Clear the bit for fd

maxfdp = (fd_read1 > fd_read2) ? fd_read1 : fd_read2;
if (fd_write1 > maxfdp)
  maxfdp = fd_write1;

/* Timeout: 2.3 seconds */
timeout_backup.tv_sec = 2;
timeout_backup.tv_usec = 300;

for (;;) {
  rset = rset_backup;
  wset = wset_backup;
  timeout = timeout_backup;  // Linux's select() can modify timeout
  retval = select(maxfdp + 1,
                  &rset,  // Ready for reading?  Can be NULL.
                  &wset,  // Ready for writing?  Can be NULL.
                  NULL, // Have an exception condition pending?  Can be NULL.
                  &timeout  // Can be NULL.
                  );

  if (retval > 0) {  // Positive counts of ready descriptors
    if (FD_ISSET(fd_read1, &rset)) {
      // fd_read1 is readable
     ...
    }
    if (FD_ISSET(fd_read2, &rset)) {
      // fd_read2 is readable
     ...
    }
    if (FD_ISSET(fd_write1, &wset)) {
      // fd_write1 is writable
     ...
    }
  }
  else if (retval == 0) {  // Timeout
    // Linux (but not on most other systems) reflects the amount of time not slept in 'timeout'.
    ...
  }
  else {  // retval < 0
    // Error
    ...
  }
}
...