Tips To Fix Sendmsg Error

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    Over the past few weeks, some users have reported an error to us when submitting a message. The purpose of sendmsg () is to send a message over a simple socket with or without connection. Typically, when s is a connectionless socket, the message is sent to the point indicated by msghdr. If this message is too long to attempt to use the underlying protocol, sendmsg () will stop and no data will be sent.

    I’m having trouble programming UDP sockets. I want to use the sendmsg () and recvmsg () APIs to be able to communicate between the borrower and the server. The customer code is returned definitively with a 105 ENOBUFS error. I have no idea why it is showing this key factual error, because as per the description of these APIs it is written

    sendmsg error

      ENOBUFSThe network system result queue is full. In most cases, this means that the interface has stopped transmitting, but this could be due to a momentary overload. (This usually cannot happen on Linux. Packages are simply discarded silently when the best device queue is full.) 

    sendmsg error

    So this error is not common and I ran into this one. If anyone has similar problems, please share the information. I am looking for a solution, not a turnkey solution. Also don’t use the alternative API. Forwork you will need the next part related to the code.

    Server Code

    Is Sendmsg Atomic?

    sendmsg can be an atomic operation. With UDP, you should be able to read more than one datagram at a time.call. If you do use sockets for datagrams, see what the experts say that the I / O vector has enough buffer space to hold a great incoming datagram.

      #include #include # enable #include #include #include #include #define PORT 32000#define BUFSIZE 8192int main ()    int sockfd, n;    struct sockaddr_in servaddr, cliaddr;    socklen_t len;    mesg [1000]; char char message_control_array [BUFSIZE];    int add = 1;    struct iovec io;    int ret = 0;    interval ttval = 255;    / * The structure of the message header to display when calling recvmsg * /    header struct msghdr;    / * This structure usually contains separate additional messages * /    struct cmsghdr * cmsg;    / * Fill in the tax variables. * /    header.msg_name = & servaddr;    header.msg_namelen = sizeof Sockaddr_in); (struct header.msg_control Message_control_array; = header.msg_controller = BUFSIZE;   .Msg_iov = & io;    header.message; msg_iov-> iov_base = header.msg_iov-> iov_len 1000; = header.msg_iovlen is 1;    / * Create UDP socket * /    in case ((sockfd = socket (AF_INET, SOCK_DGRAM, IPPROTO_UDP)) <0)                printf ("Error 1: socket  n");            Exit (1);        ret matches setsockopt (sockfd, IPPROTO_IP, IP_TTL, & ttlval, sizeof (ttlval));    if (ret == -1)                printf ("setsockopt refuses Errno ip_ttl,% d  n", errno);        bzero (& servaddr, sizeof (servaddr));    servaddr.sin_family implies AF_INET;    servaddr.sin_addr.s_addr = htonl (INADDR_ANY);    servaddr.sin_port = htons (PORT);    if ((bind (sockfd, (struct sockaddr *) & servaddr, sizeof (servaddr))) == -1)                printf ("Error 2: binding  n");            Exit (1);        during (1)  // len implies sizeof (cliaddr);  // if ((n matches recvfrom (sockfd, mesg, 1000,0, (struct sockaddr *) & cliaddr, & len)) == -1)  in case ((n = recvmsg (sockfd, & header, 0)) == -1)                printf ("recvmsg error !!!!!!!!!!!!!  n  n");        / * Return the received packet to the sender [client] * /    // sendto (sockfd, mesg, n, 0, (struct sockaddr *) & cliaddr, sizeof (cliaddr));    printf ("---------------------------------------------- - ---------- --------  No ");    mesg [n] means 0;   Printf ("Get all of the following:  n");    printf ("% s  n", message);    printf ("Information usually comes from the structure msghdr  n");    printf ("Local address% s  n", inet_ntoa (servaddr.sin_addr.s_addr));    source printf ("Address range% d  n", (int) header.msg_namelen);    versus (cmsg = CMSG_FIRSTHDR (& header); cmsg! matches NULL; cmsg = CMSG_NXTHDR (& header, cmsg))                printf ("number% d structure cmsg  n", count ++);            //if      printf ("---------------------------------------------- - ---------- --------  No ");Returns 0; 

    Client Code

    What is send in Linux?

    DESIGNATION. The system calls send (), sendto (), and in addition sendmsg () are used to send a message to a different socket. The send () contact can only be used if this socket is on a connected pipeline (so the intended recipient is also known). The only difference between send () and write () is the presence of flags.

      / * UDP Client Example * /# enable #include #include #include #include #include #include #include #define PORT 3200#define BUFSIZE 512int main (int argc, char ** argv)    int sockfd, n;    struct sockaddr_in servaddr, cliaddr;    the string to send the character [BUFSIZE];    char recvline [BUFSIZE];    int ret = 0;    interval ttval = 255;            / * required to publish additional data using sendmsg () call * /            header struct msghdr;    struct cmsghdr * cmsg;    struct iovec io;    where (argument 2) ! =            printf ("Usage:% s   n", argv [0]);            Exit (1);        sockfd = socket (AF_INET, SOCK_DGRAM, IPPROTO_UDP);    ret stands for setockopt (sockfd, IPPROTO_IP, IP_TTL, & ttlval, sizeof (ttlval));    every time (ret == -1)                printf ("setsockopt does not work for IP_TTL. Error% d  n", error);        bzero (& servaddr, sizeof (servaddr));    servaddr.sin_family = AF_INET;    servaddr.sin_addr.s_addr = inet_addr (argv [1]);    servaddr.sin_port = htons (PORT);    header.msg_name is & servaddr;    header.msg_namelen means Sockaddr_in size); (struct header.msg_iov is & io;    header.msg_iov-> iov_base = send string;   Header .msg_iov-> iov_len = BUFSIZE;    header.msg_iovlen = 1;    during (1)     tryagain: printf ("Please enter a string to actually send  n");     // scanf ("% s", send string);     if ever ((fgets (send string, 100, stdin)) == NULL)                  printf ("Error reading stdin  n  n");             I will try again;         header.msg_iov-> iov_len. = .strlen (send string) .- .1; ... ... ... .printf ("kddkdd.% d.% d.% s  n", .sizeof (send string), .strlen (send string вки),. send string); ... ... ... ... ... ... ... .//sendto(sockfd,sendline,strlen(sendline),0,(struct .sockaddr. *) & servaddr, sizeof (servaddr)); ... ! ... ... ... .if. ((sendmsg (sockfd ,. & header, .0)). == .- 1) ! ! ! ! ... ... ... ... ... ... ! ! ... ... ... ... ... ? ... ... ... ... .printf ("Error. in .sendmsg,  t. [Error. =.% d]  n", .error); ** cr ** ** cr **. ... ... ...#if .0 ... ** cr ** ** cr **. ... ... .if. ((n = recvfrom (sockfd, recvline, 10000,0, NULL, NULL)). == .- 1) :. ... ... ... ... ; ... ... ... ! ! ! ! ... ... ... ... ... , .printf ("recvfrom .error  n"); ... ... ... -. ... ... ... ... ... ! ... ! ... ... .end (1); ... ... ! ! ... ... ... ... ... .recvline [n] = 0; ... ... ... ... .fputs (recvline, stdout); ... ... ... .printf ("package. sent  n  n");#end if ... ... ... ... ... ... ... ... ... .Back .0; 

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  •   [root @ localhost .udp] # ../client 30.5.42.194Enter a subject to sendsuravError in sendmsg, [errno = 105]Enter the string to send     

    I am using RHEL (Red Hat 4.1.2-48) with kernel 2.6.18-194.el5 with gcc option 4.1.2

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