Eagain Error
Contents |
codes can’t occur on GNU systems, but they can occur using the GNU C Library on other systems. Macro: int EPERM
Error Eintr
Operation not permitted; only the owner of the file (or other resource) eagain error linux or processes with special privileges can perform the operation. Macro: int ENOENT No such file or directory. eagain definition This is a “file doesn’t exist” error for ordinary files that are referenced in contexts where they are expected to already exist. Macro: int ESRCH No process matches the
Npm Error Getaddrinfo Eagain
specified process ID. Macro: int EINTR Interrupted function call; an asynchronous signal occurred and prevented completion of the call. When this happens, you should try the call again. You can choose to have functions resume after a signal that is handled, rather than failing with EINTR; see Interrupted Primitives. Macro: int EIO Input/output error; usually used for physical read
Linux Kernel Error Codes
or write errors. Macro: int ENXIO No such device or address. The system tried to use the device represented by a file you specified, and it couldn’t find the device. This can mean that the device file was installed incorrectly, or that the physical device is missing or not correctly attached to the computer. 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 memory space. This condition never arises on GNU/Hurd systems. Macro: int ENOEXEC Invalid executable file format. This condition is detected by the exec functions; see Executing a File. 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). Macro: int ECHILD There are no child processes. This error happens on operations that are supposed to manipulate child processes, when there aren’t any processes to manipulate. Macro: int EDEADLK Deadlock
Aug 2004 on RedHat 7.3 #define EPERM 1 /* Operation not permitted */ #define ENOENT 2 /* No such file or directory */ #define ESRCH 3 /* No posix error codes such process */ #define EINTR 4 /* Interrupted system call */ #define EIO 5
Linux Errno Example
/* I/O error */ #define ENXIO 6 /* No such device or address */ #define E2BIG 7 /* Arg list c programming error codes too long */ #define ENOEXEC 8 /* Exec format error */ #define EBADF 9 /* Bad file number */ #define ECHILD 10 /* No child processes */ #define EAGAIN 11 /* Try again http://www.gnu.org/s/libc/manual/html_node/Error-Codes.html */ #define ENOMEM 12 /* Out of memory */ #define EACCES 13 /* Permission denied */ #define EFAULT 14 /* Bad address */ #define ENOTBLK 15 /* Block device required */ #define EBUSY 16 /* Device or resource busy */ #define EEXIST 17 /* File exists */ #define EXDEV 18 /* Cross-device link */ #define ENODEV 19 /* No such device */ #define ENOTDIR 20 /* http://www-numi.fnal.gov/offline_software/srt_public_context/WebDocs/Errors/unix_system_errors.html Not a directory */ #define EISDIR 21 /* Is a directory */ #define EINVAL 22 /* Invalid argument */ #define ENFILE 23 /* File table overflow */ #define EMFILE 24 /* Too many open files */ #define ENOTTY 25 /* Not a typewriter */ #define ETXTBSY 26 /* Text file busy */ #define EFBIG 27 /* File too large */ #define ENOSPC 28 /* No space left on device */ #define ESPIPE 29 /* Illegal seek */ #define EROFS 30 /* Read-only file system */ #define EMLINK 31 /* Too many links */ #define EPIPE 32 /* Broken pipe */ #define EDOM 33 /* Math argument out of domain of func */ #define ERANGE 34 /* Math result not representable */ #define EDEADLK 35 /* Resource deadlock would occur */ #define ENAMETOOLONG 36 /* File name too long */ #define ENOLCK 37 /* No record locks available */ #define ENOSYS 38 /* Function not implemented */ #define ENOTEMPTY 39 /* Directory not empty */ #define ELOOP 40 /* Too many symbolic links encountered */ #define EWOULDBLOCK EAGAIN /* Operation would block */ #define ENOMSG 42 /* No message of desired type */ #define EIDRM 43 /* Identifier removed
Routing, Routers, Network protocols in this UNIX and Linux forum. Search Forums Show Threads Show Posts Tag Search Advanced Search Unanswered Threads Find All Thanked Posts Go to Page... unix and linux operating commands http://www.unix.com/ip-networking/147090-getting-eagain-error-while-sending.html Getting EAGAIN error while sending IP Networking Thread Tools Search this Thread Display Modes #1 10-25-2010 mr_deb Registered User Join Date: May 2008 Last Activity: 12 July http://developerweb.net/viewtopic.php?id=4267 2013, 1:41 PM EDT Posts: 27 Thanks: 1 Thanked 0 Times in 0 Posts Getting EAGAIN error while sending Hi Guys I am using one non blocking socket to send message to the servers.I am using Solaris error codes OS .I am using default buffer size for the socket.The message I am sending roughly size is 20 bytes.I am sending such 18 messages.But I am getting EAGAIN error very occasionally while sending those messages .I observed when I am rebooting the system and send those 18 messages I am getting that EGAIN error .But if Again I am sending those messages afterwards its not giving me any error .Is there any specific reason eagain error linux why its happening after re-boot. Moreover I want to know when its giving EGAIN its there any way to know how much send buffer is occupied.I dnt have acess to the code of server.So can it be problem of receiving buffer? Remove advertisements Sponsored Links mr_deb View Public Profile Find all posts by mr_deb #2 10-25-2010 jim mcnamara ...@... Join Date: Feb 2004 Last Activity: 9 October 2016, 11:34 AM EDT Location: NM Posts: 10,830 Thanks: 449 Thanked 968 Times in 899 Posts You have to delay the send with a timer in a loop, say retry 10 times, then throw a fatal error or just log an error and go on to the next send(); Code: struct timespec tsp={0, 200}; // note you may well sleep longer than the interval.... int rc=0; int i=0; fprintf(stderr, "%s: OSS port blocking a send\n", now()); for(i=0; i< 10; i++) { nanosleep(&tsp, NULL); if( (rc=send(s, p, len, 0)>0) ) { fprintf(stdout, "%s: OSS port send completed\n"); break; } } you have to handle the problem in your code; Remove advertisements Sponsored Links jim mcnamara View Public Profile Find all posts by jim mcnamara #3 10-25-2010 ygemici sed_shell@LNU Join Date: Feb 2010 Last Activity: 10 August 2015, 5:22 PM EDT Location: istanbul
Post reply #1 2005-12-14 07:27 PM duncang Member From: UK Registered: 2004-04-30 Posts: 30 Re: Strategy for EAGAIN on non-blocking sockets Hi What would be a reasonable strategy for handling EAGAIN when reading from a non-blocking TCP socket ? I'm definitely expecting data (according to my protocol) so it's probably just a brief network delay. Going into a tight retry loop works, but doesn't seem a good way to approach things. Should I back off for a moment, e.g. // wait a while tv.tv_sec = 0; tv.tv_usec = 250; select(0, NULL, NULL, NULL, &tv); & if so, how long, or do something else ? tia D - Offline Quote #2 2005-12-14 09:13 PM RobSeace Administrator From: Boston, MA Registered: 2002-06-12 Posts: 3,822 Website Re: Strategy for EAGAIN on non-blocking sockets Well, you almost have it right with that select(), except you're just using it as a pure sleep()-like delay, instead of taking advantage of its intended use: checking for input on the socket FD! ;-) So, really, you want something more like this: fd_set rset; struct timeval timeout; /* ... */ for (;;) { i = read (sockfd, buf, MAX_READ); if (i < 0) { if (errno == EINTR) { continue; /* perfectly normal; try again */ } else if (errno == EAGAIN) { FD_ZERO (&rset); FD_SET (sockfd, &rset); timeout.tv_sec = MAX_IDLE_SECS; timeout.tv_usec = MAX_IDLE_USECS; i = select (sockfd + 1, &rset, NULL, NULL, &timeout); if (i < 0) { /* error; log/die/whatever and close() socket */ } else if (i == 0) { /* timed out without receiving any data; log/die/whatever and close() */ } /* else, socket is now readable, so loop back up and do the read() again */ } else { /* some real error; log/die/whatever and close() socket */ } } else if (i == 0) { /* the connection has been closed by your peer; clean-up and close() */ } else { /* you got some data; do whatever with it... */ } } Where MAX_IDLE_* just define how long you're willing to wait for data to arrive before giving up on the connection as dead/inactive... It's ok to make that a relatively large value, if you're ok with that... There's no need to wake up periodically and check for data to read, because that's the whole point of select(): telling you when there is data to read... Offline Quote #3 2005-12-14 09:37 PM i3839 Oddministrator From: Amsterdam Registered: 2003-06-07 Posts: 2,229 Re: Strategy for EAGAIN on non-blocking sockets An alternative would be to temporary set the socket to blocking mode, and to non-blocking again after the recv(). Or use blocking sockets and pass the MSG_DONTWAIT flag to recv() everywhere except in this c