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Linux C Socket Error Codes

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SOCK_PACKET Obsolete and should not be used in new programs; see packet(7). When SO_KEEPALIVE is enabled on the socket the protocol checks in a protocol-specific manner if the other end is still alive. This page first describes common features of all three system calls, and then describes the differences between the calls. This is a “file doesn’t exist” error for ordinary files that are referenced in contexts where they are expected to already exist. this contact form

The operation of sockets is controlled by socket level options. Backdoor account in passwd file Save output of Con statement to different folder Why didn't Hans Gruber know what Mr. Was Harry's concern about Fleur's sister Gabrielle misplaced? When recvmsg() is called, msg_controllen should contain the length of the available buffer in msg_control; upon return from a successful call it will contain the length of the control message sequence. have a peek at this web-site

Linux Errno Example

MSG_WAITALL (since Linux 2.2) This flag requests that the operation block until the full request is satisfied. SOCK_SEQPACKET sockets employ the same system calls as SOCK_STREAM sockets. When the network signals an error condition to the protocol module (e.g., using a ICMP message for IP) the pending error flag is set for the socket.

According to POSIX.1-2001, the msg_controllen field of the msghdr structure should be typed as socklen_t, but glibc currently types it as size_t. EXAMPLE top An example of the use of recvfrom() is shown in getaddrinfo(3). The original destination address of the datagram that caused the error is supplied via msg_name. Strerror(errno) Link bubrek November 3, 2010, 11:46 am i have to make stronge grip on C++ please help me by sending handout/notes and practices Link Cancel reply Leave a Comment Name Email

NOTES top POSIX.1 does not require the inclusion of , and this header file is not required on Linux. Linux Errno Codes MSG_PEEK This flag causes the receive operation to return data from the beginning of the receive queue without removing that data from the queue. COLOPHON top This page is part of release 4.08 of the Linux man-pages project. http://www.thegeekstuff.com/2010/10/linux-error-codes/ See also accept(2).

Macro: int ENOSYS Function not implemented. Errno To String The system does not guarantee that it will notice all such situations. NOTES top If a zero-length datagram is pending, read(2) and recv() with a flags argument of zero provide different behavior. You really need to know what error number 17 means.

Linux Errno Codes

However, the call may still return less data than requested if a signal is caught, an error or disconnect occurs, or the next data to be received is of a different over here Macro: int EFBIG File too big; the size of a file would be larger than allowed by the system. Linux Errno Example EMFILE The per-process limit on the number of open file descriptors has been reached. Errno.h In C To understand the nature of the error these codes need to be interpreted.

The returned address is truncated if the buffer provided is too small; in this case, addrlen will return a value greater than was supplied to the call. http://globalinfoindex.com/linux-errno/linux-errno.php According to this: http://linux.die.net/man/2/socket the function returns -1 on failure, and sets errno to the appropriate error number. MSG_WAITALL (since Linux 2.2) This flag requests that the operation block until the full request is satisfied. Macro: int ETIMEDOUT A socket operation with a specified timeout received no response during the timeout period. How To Use Errno

On error, -1 is returned, and errno is set appropriately. If a message is too long to fit in the supplied buffer, excess bytes may be discarded depending on the type of socket the message is received from. However, on (very) old UNIX systems, there may be no and the declaration is needed. http://globalinfoindex.com/linux-errno/linux-error-2.php SOCK_PACKET is an obsolete socket type to receive raw packets directly from the device driver.

ee_origin is the origin code of where the error originated. Errno C++ errno Code Table The values of errno shown in this table are returned to C socket library applications when the return value is -1: errno Name Value Description EPERM 1 Not The user should supply a buffer of sufficient size.

Thus, a subsequent receive call will return the same data.

Macro: int EAGAIN Resource temporarily unavailable; the call might work if you try again later. For use with Internet stream sockets, see tcp(7). MSG_TRUNC (since Linux 2.2) For raw (AF_PACKET), Internet datagram (since Linux 2.4.27/2.6.8), netlink (since Linux 2.6.22) and UNIX datagram (since Linux 3.4) sockets: return the real length of the packet or Errno 0 Errors: Linux System Errors When system requests fail, error code are returned.

So there is one errno for each thread. Instead it would just exit the program. The error is supplied in a sock_extended_err structure: #define SO_EE_ORIGIN_NONE 0 #define SO_EE_ORIGIN_LOCAL 1 #define SO_EE_ORIGIN_ICMP 2 #define SO_EE_ORIGIN_ICMP6 3 struct sock_extended_err { uint32_t ee_errno; /* error number */ uint8_t ee_origin; his comment is here Macro: int E2BIG Argument list too long; used when the arguments passed to a new program being executed with one of the exec functions (see Executing a File) occupy too much

Macro: int ED The experienced user will know what is wrong. Macro: int EAUTH ??? Macro: int ETOOMANYREFS ??? The other fields are protocol-specific.

Macro: int EBADF Bad file descriptor; for example, I/O on a descriptor that has been closed or reading from a descriptor open only for writing (or vice versa). errno is thread-local; setting it in one thread does not affect its value in any other thread. Macro: int EPROTOTYPE The socket type does not support the requested communications protocol. Macro: int ESRCH No process matches the specified process ID.

Macro: int EPROGUNAVAIL ??? EBADF The argument sockfd is an invalid descriptor. The msg_flags field in the msghdr is set on return of recvmsg(). CONFORMING TO top POSIX.1-2001, POSIX.1-2008, 4.4BSD (these interfaces first appeared in 4.2BSD).

Is it worth sending a manned mission to a black hole? MSG_OOB This flag requests receipt of out-of-band data that would not be received in the normal data stream. ENOTCONN The socket is associated with a connection-oriented protocol and has not been connected (see connect(2) and accept(2)). To make your program portable, you should check for both codes and treat them the same.

Follow us on Google+ Follow us on Twitter Become a fan on Facebook Support Us Support this blog by purchasing one of my ebooks. 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 You can use perror in stdio.h to print an error message based on the value of errno or you can use strerror in string.h to access a string describing the error For error receives, the MSG_ERRQUEUE is set in the msghdr.

If the entire function is not available at all in the implementation, it returns ENOSYS instead. The payload of the original packet that caused the error is passed as normal data via msg_iovec. 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 This often indicates a cycle of symbolic links.