Error Recvfrom

socket SYNOPSIS #include <sys/socket.h>

ssize_t recvfrom(int socket, void *restrict buffer, size_t length,
int flags, struct sockaddr *restrict address,
socklen_t *restrict address_len);
DESCRIPTION The recvfrom() function recvfrom function shall receive a message from a connection-mode or connectionless-mode socket. It is normally

Recvfrom Example

used with connectionless-mode sockets because it permits the application to retrieve the source address of received data. The recvfrom() function takes

Recvfrom Udp

the following arguments: socket Specifies the socket file descriptor. buffer Points to the buffer where the message should be stored. length Specifies the length in bytes of the buffer pointed to by the

Recvfrom Struct

buffer argument. flags Specifies the type of message reception. Values of this argument are formed by logically OR'ing zero or more of the following values: MSG_PEEK Peeks at an incoming message. The data is treated as unread and the next recvfrom() or similar function shall still return this data. MSG_OOB Requests out-of-band data. The significance and semantics of out-of-band data are protocol-specific. MSG_WAITALL On SOCK_STREAM sockets this requests recvfrom error 10054 that the function block until the full amount of data can be returned. The function may return the smaller amount of data if the socket is a message-based socket, if a signal is caught, if the connection is terminated, if MSG_PEEK was specified, or if an error is pending for the socket. address A null pointer, or points to a sockaddr structure in which the sending address is to be stored. The length and format of the address depend on the address family of the socket. address_len Specifies the length of the sockaddr structure pointed to by the address argument. The recvfrom() function shall return the length of the message written to the buffer pointed to by the buffer argument. For message-based sockets, such as [RS] SOCK_RAW, SOCK_DGRAM, and SOCK_SEQPACKET, the entire message shall be read in a single operation. If a message is too long to fit in the supplied buffer, and MSG_PEEK is not set in the flags argument, the excess bytes shall be discarded. For stream-based sockets, such as SOCK_STREAM, message boundaries shall be ignored. In this case, data shall be returned to the user as soon as it becomes available, and no data shall be discarded.

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here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of http://stackoverflow.com/questions/10621508/recvfrom-function-returns-1-with-no-error this site About Us Learn more about Stack Overflow the company Business http://stackoverflow.com/questions/32921833/c-recvfrom-error-22 Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up recvfrom error recvfrom function returns -1 with no error up vote 1 down vote favorite The title pretty much says it all. I have a receiving thread waiting for input from a client, but when nothing is read, instead of returning 0 bytes read, it returns -1 yet no errors are returned. Any hints has to why this function would behave like that? Thanks EDIT: recvfrom error 10054 This is the receiving code sockaddr_in remote; remote.sin_family = AF_UNSPEC; remote.sin_addr.s_addr = inet_addr( _host.c_str() ); remote.sin_port = htons( atoi( _port.c_str() ) ); int remoteSize = sizeof(remote); bytesRead = recvfrom(_os.socket, (char*)buffer, bufferSize, 0,(SOCKADDR*)&remote, &remoteSize); _error = WSAGetLastError(); When I'm executing, bytesRead is -1 and _error is 0. c++ network-programming udp winsock share|improve this question edited May 16 '12 at 15:48 Griwes 5,96021858 asked May 16 '12 at 15:13 nevero 1,29732142 can u post ur code? –Mohamed Jameel May 16 '12 at 15:15 How are you determining that no error is returned? –Mat May 16 '12 at 15:21 WSAGetLastError is your friend in this situation. A value of 0 would have meant that the connection was closed. Any value > 0 is the number of bytes read. Invoke WSAGetLastError() to determine the cause. –Jaywalker May 16 '12 at 15:22 -1 is the value of SOCKET_ERROR, which is returned from recvfrom() when a failure occurs. Use WSAGetLastError() to determine reason for failure. –hmjd May 16 '12 at 15:23 Any reasons why you are using WinSock directly, instead of Boost.Asio? &ndas

here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up c- recvfrom error 22 up vote 0 down vote favorite Okay first here is the code: int recvMast_sock; struct sockaddr_in serv_addr, cli_addr; socklen_t cli_len; if ((recvMast_sock = socket(AF_INET, SOCK_DGRAM, 0)) == -1) { critErr("listen:socket="); } fillSockaddrAny(&serv_addr, UDP_NODE_LISTEN_PORT);// fills the sockaddr_in works fine elsewhere if ((bind(recvMast_sock, (struct sockaddr*) &serv_addr, sizeof serv_addr)) < 0) { critErr("listen:bind recv_mast_sock:"); } recvReturn_i = recvfrom(recvMast_sock, &recvBuff[0], (size_t)1, 0, (struct sockaddr*) &cli_addr, &cli_len); if(recvReturn_i <0) printf("recv error%d\n",errno); critErr is a function to handle errors which also includes a print of the error and an exit. This runs ins a thread, if this is of an relevance. If I compile and run this on a Zedboard (ZYNQ-7000 SoC) which has an ARM Cortex A9 and Linaro Linux which is based on precise Ubuntu. It prints error 22 but still has the received value in recvBuff[0]. Running this in my VM with xubuntu it works fine. Error 22 equals EINVAL which is described as Invalid argument. In the manpage of recvfrom(2) it states EINVAL means that the MSG_OOB flag is set but I dont use any flags 0. Before leaving on friday I started an apt-get upgrade because I hope it is a faulty library or something like this. I can check back at monday but maybe someone here has another idea what is wrong. c linux sockets linaro share|improve this question edited Oct 6 '15 at 21:43 asked Oct 3 '15 at 11:06 Kami Kaze 1348 2 I highly doubt this has something to do with the architecture, instead check that the setup is ok. –iharob Oct 3 '15 at 11:07 setup in what kind of sense. The installation of the linux or the hardware? Networking works normal except for that. Its not the first call to a recvfrom. –Kami