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Linux Socket Get Last Error


Thanks! SOCK_PACKET is an obsolete socket type to receive raw packets directly from the device driver. Sending structured dataSockets are a perfect vehicle for sending unstructured binary byte-streams or ASCII streams of data (such as HTML pages over HTTP, or e-mail over SMTP). In other words, the boundaries of the messages that the writer provides are preserved for the reader.Now, look at the bottom of Figure 1. http://softacoustik.com/linux-errno/linux-socket-error-107.php

In such cases, a successful return can be distinguished from an error return by setting errno to zero before the call, and then, if the call returns a status that indicates The following table shows list of error numbers and its descriptions in Linux operation system ERROR CODE TABLE Error number Error Code Error Description 1 EPERM Operation not permitted 2 ENOENT E2BIG Argument list too long (POSIX.1) EACCES Permission denied (POSIX.1) EADDRINUSE Address already in use (POSIX.1) EADDRNOTAVAIL Address not available (POSIX.1) EAFNOSUPPORT Address family not supported (POSIX.1) EAGAIN Resource temporarily unavailable Build your next development project on Linux with IBM trial software, available for download directly from developerWorks.Discuss Get involved in the developerWorks community by participating in developerWorks blogs. http://stackoverflow.com/questions/27096985/getting-error-code-when-creating-a-socket-in-linux

Linux Errno Example

See getprotoent(3) on how to map protocol name strings to protocol numbers. SOCK_RAW Provides raw network protocol access. Listing 4 shows some of the options that netstat provides and the features they enable.Listing 4. Out-of-band data may also be transmitted as described in send(2) and received as described in recv(2).

Browse other questions tagged c linux sockets or ask your own question. You could explain more each error so that beginners really get the problem behind it (even if it is generic). For some protocols it is possible to enable a per-socket error queue to retrieve detailed information about the error; see IP_RECVERR in ip(7). Errno To String In general, you should code like this: #include #include int main(void) { int s; s = socket(...); if (s < 0) { fprintf(stderr, "socket() failed: %s\n", strerror(errno)); exit(1); }

The man page for many library functions will indicate that they return -1 on error, and set errno. You can run into trouble here as well, because not all compilers align the elements of a structure in the same way. ResourcesLearn The TCP State Machine includes eleven states. check here The functions setsockopt(2) and getsockopt(2) are used to set and get options, respectively.

Display name:*(Must be between 3 – 31 characters.) By clicking Submit, you agree to the developerWorks terms of use. Errno Windows Not the answer you're looking for? You might find a new tool that you can't do without. The UDP layer of the stack keeps track of the quantities of the writes and ensures that when the receiver on the right gets the data through the socket, it arrives

Linux Errno 22

Tim Jones ([email protected]), Consultant Engineer, Emulex Close [x] M. A stream socket must be in a connected state before any data may be sent or received on it. Linux Errno Example Luckily, there's a way to get around the TIME_WAIT state. Errno C++ Ignoring the return status here would result in an incomplete send and subsequent loss of data.Back to topPitfall 2.

After the TIME_WAIT state has exited, the socket is removed, and the address can be rebound without issue.Waiting for TIME_WAIT to finish can be annoying, especially if you're developing a socket this page This documentation is archived and is not being maintained. for example for the "getaddrinfo" function i can do this: //Resolve the server address and port result = (struct addrinfo *) calloc(1, sizeof(struct addrinfo)); iResult = getaddrinfo("google.com", DEFAULT_PORT, &hints, &result); if if (s < 0) { perror("socket"); exit(1); } Wrapping it all up - error handling need not be complex and verbose. How To Use Errno

Notices Welcome to LinuxQuestions.org, a friendly and active Linux Community. Remarks The WSAGetLastError function returns the last error that occurred for the calling thread. Many Thanks! –Yahya Uddin Nov 24 '14 at 2:38 nit: #define errno (*__get_errno()) would be legal, it's not necessarily a variable, it's a macro "which expands to a modifiable http://softacoustik.com/linux-errno/linux-socket-error-code-110.php Framing capabilities of UDP and the lack of framing in TCPThe top of Figure 1 illustrates a UDP client and server.

Avoiding the "Address In Use" error using the SO_REUSEADDR socket optionint sock, ret, on; struct sockaddr_in servaddr; /* Create a new stream (TCP) socket */ sock = socket( AF_INET, SOCK_STREAM, 0 Errno 0 Putting the socket call and the test for < 0 in one statement, the above code could look like this, and you'll be a real UNIX pro: #include #include COLOPHON top This page is part of release 4.08 of the Linux man-pages project.

But all the rest did!

So the above example could be replaced with: if (s < 0) { fprintf(stderr, "socket() failed: %m\n"); exit(1); } And to make it all simpler, there is the perror function, which Converting Game of Life images to lists Why does Luke ignore Yoda's advice? Better if you could help me by sending code in personel. Errno 13 But you gave nothing special more than formatting the contents of the linux errno headers.

The structure could also be packed to minimize wasted space, further misaligning the elements in the structure.Fortunately, there are solutions to this problem that ensure consistent interpretation of data by both To specifically reset the extended error code, use the WSASetLastError function call with the iError parameter set to zero. Remember: when checking out the man page of a utility, follow the related or "see also" tools. useful reference There are two flags in the open call.

LinuxQuestions.org > Forums > Non-*NIX Forums > Programming Socket Error codes User Name Remember Me? The currently understood formats include: Name Purpose Man page AF_UNIX, AF_LOCAL Local communication unix(7) AF_INET IPv4 Internet protocols ip(7) AF_INET6 IPv6 Internet protocols ipv6(7) AF_IPX IPX - Novell protocols AF_NETLINK Kernel Requirements Minimum supported client Windows 8.1, Windows Vista [desktop apps | Windows Store apps] Minimum supported server Windows Server 2003 [desktop apps | Windows Store apps] Minimum supported phone Windows Phone 8 Header Winsock2.h If a function call's return value indicates that error or other relevant data was returned in the error code, WSAGetLastError should be called immediately.

Comments Close [x] developerWorks: Sign in Required fields are indicated with an asterisk (*). See ASP.NET Ajax CDN Terms of Use – http://www.asp.net/ajaxlibrary/CDN.ashx. ]]> Latest LQ Deal: Linux Power User Bundle Blogs Recent The Ethereal network protocol analyzer provides the functionality of tcpdump but with a graphical UI and scalable plug-in architecture. If you need to reset your password, click here.

EINVAL Invalid flags in type. Since Linux 2.6.27, the type argument serves a second purpose: in addition to specifying a socket type, it may include the bitwise OR of any of the following values, to modify The socket cannot be created until sufficient resources are freed. asked 1 year ago viewed 1586 times active 1 year ago Related 48Get IP address of an interface on Linux13Find original owning process of a Linux socket1Data is not received correctly

TCP is a stream-based protocol that assumes the data being communicated is unstructured, as shown in Figure 1.Figure 1. Peer socket closureOne of the interesting aspects of UNIX is that you can view almost everything as a file. Ethereal is a professional protocol analyzer that can help debug application layer protocols. Valid error numbers are all nonzero; errno is never set to zero by any system call or library function.