Error Writing To Socket Bad Address
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Error Writing To Socket Broken Pipe
a minute: Sign up write() bad address up vote 3 down vote favorite I am trying to write out the size in bytes of a string that is defined as #define PATHA "/tmp/matrix_a" using the code rtn=write(data,(strlen(PATHA)*sizeof(char)),sizeof(int)); if(rtn < 0)
Error Writing To Socket Invalid Argument
perror("Writing data_file 2 "); I get back Writing data_file 2 : Bad address What exactly about this is a bad address? The data file descriptor is open, and writes correctly immediately before and after the above code segment. The data to be written to the file data needs to be raw, and not ASCII. I have also tried defining the string as a char[] with the same issue c linux share|improve this question edited Dec 5 '12 at 23:39 asked Dec 5 3cdaemon error writing to socket '12 at 22:37 fotg 314519 add a comment| 5 Answers 5 active oldest votes up vote 2 down vote accepted The second argument to write() is the address of the bytes you want to write, but you are passing the bytes you want to write themselves. In order to get an address, you must store those bytes in a variable (you can't take the address of the result of an expression). For example: size_t patha_len = strlen(PATHA); rtn = write(data, &patha_len, sizeof patha_len); share|improve this answer answered Dec 5 '12 at 23:48 caf 155k14193324 add a comment| up vote 3 down vote The second argument to write() is the buffer and third argument is the size: ssize_t write(int fd, const void *buf, size_t count); The posted code passes the length which is interpreted as an address which is incorrect. The compiler should have emitted a warning about this (don't ignore compiler warnings and compile with the warning level at the highest level). Change to: rtn=write(data, PATHA, strlen(PATHA)); Note sizeof(char) is guaranteed to be 1 so it can be omitted from the size calculation. share|improve this answer answered Dec 5 '12 at 22:40 hmjd 88.8k8115178 Correct, though not as ASCII text, instead as raw binary data. –fotg Dec 5 '12 at 23:40 @nos, I see that you are correct. I must admit that never occurred to me and has already been answered. –hmjd Dec 6 '12 at 8:38
HCL Search Reviews Search ISOs Go to Page... LinuxQuestions.org > Forums > Linux Forums > Linux - Newbie ERROR writing to error writing to authentication socket socket: Bad address User Name Remember Me? Password Linux - Newbie bad address errno This Linux forum is for members that are new to Linux. Just starting out and have a question? bad address error linux If it is not in the man pages or the how-to's this is the place! Notices Welcome to LinuxQuestions.org, a friendly and active Linux Community. You are currently http://stackoverflow.com/questions/13733776/write-bad-address viewing LQ as a guest. By joining our community you will have the ability to post topics, receive our newsletter, use the advanced search, subscribe to threads and access many other special features. Registration is quick, simple and absolutely free. Join our community today! Note that registered members see fewer ads, and ContentLink is completely disabled once you http://www.linuxquestions.org/questions/linux-newbie-8/error-writing-to-socket-bad-address-4175420587/ log in. Are you new to LinuxQuestions.org? Visit the following links: Site Howto | Site FAQ | Sitemap | Register Now If you have any problems with the registration process or your account login, please contact us. If you need to reset your password, click here. Having a problem logging in? Please visit this page to clear all LQ-related cookies. Introduction to Linux - A Hands on Guide This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter. For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out t
Search Username Password Remember Me? Register Lost Password? facebook google twitter rss Free Web Developer Tools Advanced Search Forum Programming Languages C Programming Socket write() error - simple socket program Thread: http://forums.devshed.com/programming-42/socket-write-error-simple-socket-program-631031.html Socket write() error - simple socket program Share This Thread Tweet This + 1 this Post To Linkedin Subscribe to this Thread Subscribe to This Thread August 10th, 2009,09:30 PM #1 No Profile Picture Superman859 View Profile View Forum Posts Contributing User Devshed Newbie (0 - 499 posts) Join Date Mar 2007 Posts 313 Rep error writing Power 32 Socket write() error - simple socket program I'm taking a network programming class this upcoming Fall, but it's been a long time since I did any work in C/C++ so I've started a little ahead to give myself some time to get used to C/C++ again. I'm working with Unix Network Programming (V1, 3rd, Stevens) and on the last exercise of chapter 1, error writing to which involves modifying a daytime server program to write each byte individually rather than print the whole character array - this is where the problem arises. When I compile the new version, I first receive this error: warning: passing argument 2 of ‘Write’ makes pointer from integer without a cast Note: Write is capitalized being a wrapper class for write() (lowercase) - the function is correct capitalized. When I run the server and then request info with the client, I receive this error on the server: write error: Bad address I believe "write error" is coded into the Write() wrapper function possibly. Anyways - not sure what the problem is, but it seems like a simple writing issue of a character array. Code: int main(int argc, char **argv) { int listenfd, connfd; struct sockaddr_in servaddr; char buff[MAXLINE]; time_t ticks; listenfd = Socket(AF_INET, SOCK_STREAM, 0); bzero(&servaddr, sizeof(servaddr)); servaddr.sin_family = AF_INET; servaddr.sin_addr.s_addr = htonl(INADDR_ANY); servaddr.sin_port = htons(9999); /* daytime server */ Bind(listenfd, (SA *) &servaddr, sizeof(servaddr)); Listen(listenfd, LISTENQ); for ( ; ; ) { connfd = Accept(listenfd, (SA *) NULL, NULL); ticks = time(NULL); snprintf(buff, sizeof(buff), "%.24s\r\n", ctime(&ticks)); //Write(connfd, buff, strlen(buff)); this is the