Accept Error Resource Temporarily Unavailable
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Socket Error Resource Temporarily Unavailable Python
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Error 35 Resource Temporarily Unavailable
like you, helping each other. Join them; it only takes a minute: Sign up ERROR on accept: Resource temporarily unavailable up vote 4 down vote favorite I am trying to create single threaded server in linux (red-hut) in C that will listen to multiple sockets. I need to use non-blocking sockets, when I set the flags error cannot fork for fetch pack resource temporarily unavailable to non-blocking like this: int flagss = fcntl(socketfds[j],F_GETFL,0); flagss |= O_NONBLOCK; fcntl(socketfds[j],F_SETFL,flagss); I get: ERROR on accept: Resource temporarily unavailable Otherwise everything works perfectly. c linux sockets share|improve this question edited Jan 19 '12 at 23:18 EboMike 52.7k14111132 asked Oct 3 '11 at 13:11 oznus 1,06911311 add a comment| 1 Answer 1 active oldest votes up vote 10 down vote Resource temporarily unavailable is EAGAIN and that's not really an error. It means "I don't have answer for you right now and you have told me not to wait, so here I am returning without answer." If you set a listening socket to non-blocking as you seem to do, accept is supposed to set errno to that value when there are no clients trying to connect. You can wait for incoming connection using the select (traditional) or poll (semantically equivalent, newer interface, preferred unless you need to run on some old unix without it) or epoll (optimized for thousands of descriptors, Linux-specific) system calls. Of course you
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more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack -bash: fork: resource temporarily unavailable 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, http://stackoverflow.com/questions/7635440/error-on-accept-resource-temporarily-unavailable helping each other. Join them; it only takes a minute: Sign up Reading socket: EAGAIN: Resource temporarily unavailable up vote 2 down vote favorite 1 I have created a socket in C++ and I needed it to have certain connection timeout. So that's what is happening: Create socket Make it NON_BLOCKING Call connect It returns -1 and http://stackoverflow.com/questions/10318191/reading-socket-eagain-resource-temporarily-unavailable errno EINPROGRESS as expected Call select Returns >0, so connection has been made Make the socket BLOCKING again Code for this part is the following: bool mastControl::prepareSocket(char * address, int port, int * sockfd) { struct sockaddr_in serv_addr; struct timeval timeout = {0,100000}; struct timeval connTimeout; struct hostent * server = NULL; fd_set socketSet; socklen_t lon; int sockOpt = 0; long socketFlags = 0; int buffersize = 8; int res = 0; int connectReturn = 0; const int WAIT_TO_RECONN = 15; server = gethostbyname(address); *sockfd = socket(AF_INET, SOCK_STREAM, 0); if (*sockfd < 0) { qDebug()<<"Impossible to open socket: "< 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 http://stackoverflow.com/questions/26755362/problems-with-epoll-and-socket-accept-in-forked-children company Business Learn more about hiring developers or posting ads with us Stack Overflow http://developerweb.net/viewtopic.php?id=6513 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 Problems with epoll and socket accept in forked children up vote 1 down vote favorite I have a little resource temporarily server/client script written in Python. The server.py creates a new socket and spawns two children. in child process I register the socket des criptor for EPOLLIN event, so I can do an accept on socket in the child. The problem is, that both children are being notificated on client request, BUT only one child does the accept, and the other one is throwing an Exception "[Errno 11] Resource temporarily unavailable". HOW can I resource temporarily unavailable prevent ALL children from getting notification, if they are not able to do an accept on socket? ---server.py--- import socket, time, os, select sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) sock.bind(('127.0.0.1', 10000)) sock.listen(256) sock.setblocking(False) for _ in range(0,2): pid = os.fork() if pid == 0: #in child poll = select.epoll() poll.register(sock.fileno(), select.EPOLLIN) while True: events = poll.poll(2) # listening for events with 2 sec timeout for fileno, event in events: if event & select.EPOLLIN: # there is data on socket available print("EPOLLIN in PID: " + str(os.getpid())) try: clientsock, addr = sock.accept() clientsock.close() print("accepted and closed in PID: " + str(os.getpid())) except Exception as e: print("PID: " + str(os.getpid()) + " " + str(e)) # we are in parent process, keep it live while True: time.sleep(10) The client fires only one request to server: ---client.py--- import socket, time, select, sys s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect(('localhost',10000)) s.setblocking(False) s.close() after executing the "client.py" I am getting the following output from server: EPOLLIN in PID: 9424 EPOLLIN in PID: 9425 PID: 9424 [Errno 11] Resource temporarily unavailable accepted and closed in PID: 9425 as you can see, both of them get an EPOLLIN, BUT only one does the actual accept, the other one throws Exception. python sockets fork epoll share|improve this question asked Nov 5 '14 at 10:50 user2624 Post reply #1 2010-03-02 12:08 PM kavinsivakumar Member Registered: 2010-03-02 Posts: 7 Re: Resource temporarily unavailable Error In Socket Hi, Now I am programming to communicate with some network printer through TCP Socket program.By sending command "\033E 1\r" to printer,causes, check the port for error normally. In my case i used following code bytesSent = send( sockfd, "\033E 1\r",sizeof("\033E 1\r"), 0); bytesRecv = recv( sockfd,recvbuf, 1024, 0 ); Here command goes to printer proper manner.But when i try to receive the recv gets blocking can not able to read anything its hanging there. Then i used Non Blocking Socket with select() method in this case i am getting "Resource temporarily unavailable". Please help me to figure out this error Thanks in Advance Regards Siva Offline Quote #2 2010-03-02 01:21 PM i3839 Oddministrator From: Amsterdam Registered: 2003-06-07 Posts: 2,227 Re: Resource temporarily unavailable Error In Socket When you do a read on a socket and there's nothing to read then this happens: 1) If you are using blocking sockets, the read call will block until data arrives. 2) If using non-blocking sockets, the read won't block, but return with an error EAGAIN/EWOULDBLOCK, which means there's nothing to read. So your real problem is the printer not sending you any data at all. The "error" is not a real error, but a way to tell you what you already knew: That there is (yet) nothing to read. If I had to guess the printer either expects you to send something else or more, or it behaves as printers do and just stopped working for no apparent reason. Offline Quote #3 2010-03-02 01:36 PM kavinsivakumar Member Registered: 2010-03-02 Posts: 7 Re: Resource temporarily unavailable Error In Socket Thanks to reply to me, But in printer port have some error.I comes to know through the LCD display of Printer.Even same thing i applied in USB Printer it gives the error report.In network printer i cant able to read even port has error. Offline Quote #4 2010-03-02 02:59 PM i3839 Oddministrator From: Amsterdam Registered: 2003-06-07 Posts: 2,227 Re: Resource temporarily unavailable Error In Socket Are you trying to print out a "1"? If not, try removing the space.I'd make sure the command you're sending is correct, and to reset theprinter before sending it new stuff. Also, what reply do you expect?And I'd try to adding a \n after the \r, or instead of it. Offline Quote #5 2010-03-03 04:45 AM kavinsivakumar Member Registered: 2010-03-02 Posts: 7 Re: Resource temporarily unavailable Error In Socket Hi, The Command "\033E 1\r" is the printe