flexnbd-c/src/common/sockutil.h

#ifndef SOCKUTIL_H

#define SOCKUTIL_H

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

/* Returns the size of the sockaddr, or 0 on error */
size_t sockaddr_size(const struct sockaddr *sa);

/* Convert a sockaddr into an address. Like inet_ntop, it returns dest if
 * successful, NULL otherwise. In the latter case, dest will contain "???"
 */
const char *sockaddr_address_string(const struct sockaddr *sa, char *dest,
				    size_t len);

/* Configure TCP keepalive on a socket */
int sock_set_keepalive_params(int fd, int time, int intvl, int probes);

/* Set the SOL_KEEPALIVE otion */
int sock_set_keepalive(int fd, int optval);

/* Set the SOL_REUSEADDR otion */
int sock_set_reuseaddr(int fd, int optval);

/* Set the tcp_keepidle option */
int sock_set_tcp_keepidle(int fd, int optval);

/* Set the tcp_keepintvl option */
int sock_set_tcp_keepintvl(int fd, int optval);

/* Set the tcp_keepcnt option */
int sock_set_tcp_keepcnt(int fd, int optval);

/* Set the tcp_nodelay option */
int sock_set_tcp_nodelay(int fd, int optval);

/* Set the tcp_cork option */
int sock_set_tcp_cork(int fd, int optval);

int sock_set_nonblock(int fd, int optval);

/* Attempt to bind the fd to the sockaddr, retrying common transient failures */
int sock_try_bind(int fd, const struct sockaddr *sa);

/* Try to call select(), retrying EINTR */
int sock_try_select(int nfds, fd_set * readfds, fd_set * writefds,
		    fd_set * exceptfds, struct timeval *timeout);

/* Try to call connect(), timing out after wait seconds */
int sock_try_connect(int fd, struct sockaddr *to, socklen_t addrlen,
		     int wait);

/* Try to call close(), retrying EINTR */
int sock_try_close(int fd);

#endif