rosapps/net/ncftp/sio/SBind.c

   1 #include "syshdrs.h"
   2
   3 int
   4 SBind(int sockfd, const int port, const int nTries, const int reuseFlag)
   5 {
   6         unsigned int i;
   7         int on;
   8         int onsize;
   9         struct sockaddr_in localAddr;
  10
  11         localAddr.sin_family = AF_INET;
  12         localAddr.sin_addr.s_addr = htonl(INADDR_ANY);
  13         localAddr.sin_port = htons((unsigned short) port);
  14
  15         if (reuseFlag != kReUseAddrNo) {
  16                 /* This is mostly so you can quit the server and re-run it
  17                  * again right away.  If you don't do this, the OS may complain
  18                  * that the address is still in use.
  19                  */
  20                 on = 1;
  21                 onsize = (int) sizeof(on);
  22                 (void) setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
  23                         (char *) &on, onsize);
  24
  25 #ifdef SO_REUSEPORT
  26                 /* Tells kernel that it's okay to have more
  27                  * than one process originating from this
  28                  * local port.
  29                  */
  30                 on = 1;
  31                 onsize = (int) sizeof(on);
  32                 (void) setsockopt(sockfd, SOL_SOCKET, SO_REUSEPORT,
  33                         (char *) &on, onsize);
  34 #endif  /* SO_REUSEPORT */
  35         }
  36
  37         for (i=1; ; i++) {
  38                 /* Try binding a few times, in case we get Address in Use
  39                  * errors.
  40                  */
  41                 if (bind(sockfd, (struct sockaddr *) &localAddr, sizeof(struct sockaddr_in)) == 0) {
  42                         break;
  43                 }
  44                 if ((int) i == nTries) {
  45                         return (-1);
  46                 }
  47                 /* Give the OS time to clean up the old socket,
  48                  * and then try again.
  49                  */
  50                 sleep(i * 3);
  51         }
  52
  53         return (0);
  54 }       /* SBind */
  55
  56
  57
  58
  59 int
  60 SListen(int sfd, int backlog)
  61 {
  62         return (listen(sfd, (unsigned int) backlog));
  63 }       /* SListen */