SBind.c

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#include "syshdrs.h"
 
int
SBind(int sockfd, const int port, const int nTries, const int reuseFlag)
{
    unsigned int i;
    int on;
    int onsize;
    struct sockaddr_in localAddr;
 
    localAddr.sin_family = AF_INET;
    localAddr.sin_addr.s_addr = htonl(INADDR_ANY);
    localAddr.sin_port = htons((unsigned short) port);
 
    if (reuseFlag != kReUseAddrNo) {
        /* This is mostly so you can quit the server and re-run it
         * again right away.  If you don't do this, the OS may complain
         * that the address is still in use.
         */
        on = 1;
        onsize = (int) sizeof(on);
        (void) setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
            (char *) &on, onsize);
 
#ifdef SO_REUSEPORT
        /* Tells kernel that it's okay to have more
         * than one process originating from this
         * local port.
         */
        on = 1;
        onsize = (int) sizeof(on);
        (void) setsockopt(sockfd, SOL_SOCKET, SO_REUSEPORT,
            (char *) &on, onsize);
#endif  /* SO_REUSEPORT */
    }
 
    for (i=1; ; i++) {
        /* Try binding a few times, in case we get Address in Use
         * errors.
         */
        if (bind(sockfd, (struct sockaddr *) &localAddr, sizeof(struct sockaddr_in)) == 0) {
            break;
        }
        if ((int) i == nTries) {
            return (-1);
        }
        /* Give the OS time to clean up the old socket,
         * and then try again.
         */
        sleep(i * 3);
    }
 
    return (0);
}   /* SBind */
 
 
 
 
int
SListen(int sfd, int backlog)
{
    return (listen(sfd, (unsigned int) backlog));
}   /* SListen */