http://bugzilla.kernel.org/show_bug.cgi?id=14723 Summary: Undocumented behaviour of connect() with SO_SNDTIMEO Product: Documentation Version: unspecified Platform: All OS/Version: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: man-pages AssignedTo: documentation_man-pages@xxxxxxxxxxxxxxxxxxxx ReportedBy: rchebotarev@xxxxxxxx Regression: No Setting option SO_SNDTIMEO to the socket cause connect() return with EINPROGRESS errno after timeout, but this nonstandard feature is not described in man pages of socket(7) and connect(2). Sample: int main(int argc, char *argv[]) { int sockfd, n; struct sockaddr_in serv_addr; struct timeval timeout; timeout.tv_sec = 4; timeout.tv_usec = 0; if( (sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) { perror("socket"); return -1; } if( setsockopt(sockfd, SOL_SOCKET, SO_SNDTIMEO, &timeout, sizeof(timeout)) == -1 ) { perror("setsockopt"); return -1; } bzero (&serv_addr, sizeof(serv_addr)); serv_addr.sin_family = AF_INET; serv_addr.sin_port = htons(9999); if(inet_pton(AF_INET, argv[1], &serv_addr.sin_addr) < 1) { printf("Invalid IP address value. Exit.\n"); return -1; } if(connect(sockfd, (struct sockaddr*) &serv_addr, sizeof(serv_addr)) < 0) { printf("errno = %d\n", errno); perror("connect()"); return -1; } close(sockfd); return 0; } $ time ./client 88.88.88.88 errno = 115 connect(): Operation now in progress real 0m4.001s user 0m0.000s sys 0m0.000s # tcpdump -i ppp0 -n port 9999 -ttt tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on ppp0, link-type LINUX_SLL (Linux cooked), capture size 96 bytes 000000 IP 81.25.50.166.47087 > 88.88.88.88.9999: S 3574453598:3574453598(0) win 5840 <mss 1460,sackOK,timestamp 207409345 0,nop,wscale 6> 2. 997721 IP 81.25.50.166.47087 > 88.88.88.88.9999: S 3574453598:3574453598(0) win 5840 <mss 1460,sackOK,timestamp 207410245 0,nop,wscale 6> -- Configure bugmail: http://bugzilla.kernel.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are watching the assignee of the bug. -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
