?? timeoutconn.c
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#include <sys/types.h>#include <sys/socket.h>#include <netinet/in.h>#include <arpa/inet.h>#include "ndelay.h"#include "select.h"#include "error.h"#include "readwrite.h"#include "ip.h"#include "byte.h"#include "timeoutconn.h"int timeoutconn(s,ip,port,timeout)int s;struct ip_address *ip;unsigned int port;int timeout;{ char ch; struct sockaddr_in sin; char *x; fd_set wfds; struct timeval tv; byte_zero(&sin,sizeof(sin)); byte_copy(&sin.sin_addr,4,ip); x = (char *) &sin.sin_port; x[1] = port; port >>= 8; x[0] = port; sin.sin_family = AF_INET; if (ndelay_on(s) == -1) return -1; /* XXX: could bind s */ if (connect(s,(struct sockaddr *) &sin,sizeof(sin)) == 0) { ndelay_off(s); return 0; } if ((errno != error_inprogress) && (errno != error_wouldblock)) return -1; FD_ZERO(&wfds); FD_SET(s,&wfds); tv.tv_sec = timeout; tv.tv_usec = 0; if (select(s + 1,(fd_set *) 0,&wfds,(fd_set *) 0,&tv) == -1) return -1; if (FD_ISSET(s,&wfds)) { int dummy; dummy = sizeof(sin); if (getpeername(s,(struct sockaddr *) &sin,&dummy) == -1) { read(s,&ch,1); return -1; } ndelay_off(s); return 0; } errno = error_timeout; /* note that connect attempt is continuing */ return -1;}?? 快捷鍵說明
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