lib/libasyn/asyn_synch.c

   1 /*      asyn_synch() - step back to synch               Author: Kees J. Bot
   2  *                                                              7 Jul 1997
   3  */
   4 #include "asyn.h"
   5
   6 int asyn_synch(asynchio_t *asyn, int fd)
   7 /* No more asynchronous operations on this file descriptor. */
   8 {
   9         asynfd_t *afd;
  10         int op;
  11
  12         if ((unsigned) fd >= FD_SETSIZE) { errno= EBADF; return -1; }
  13         afd= &asyn->asyn_afd[fd];
  14
  15         for (op= 0; op < SEL_NR; op++) {
  16                 if (afd->afd_state[op] != IDLE) {
  17                         errno= EAGAIN;
  18                         return -1;
  19                 }
  20         }
  21
  22         /* Make sure the file flags are as they once were. */
  23         if (afd->afd_seen && fcntl(fd, F_SETFL, afd->afd_flags) < 0) return -1;
  24         afd->afd_seen= 0;
  25         return 0;
  26 }