Eintr Error 4
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codes can’t occur on GNU systems, but they can occur using the GNU C Library on other systems. Macro: int EPERM Operation not permitted; only
Linux Kernel Error Codes
the owner of the file (or other resource) or processes with special posix error codes privileges can perform the operation. Macro: int ENOENT No such file or directory. This is a “file doesn’t exist”
Enxio
error for ordinary files that are referenced in contexts where they are expected to already exist. Macro: int ESRCH No process matches the specified process ID. Macro: int EINTR Interrupted function linux errno to string 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 or write errors. Macro: int ENXIO No such device or address. efault 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 avoided; allocating a system resource would have resulted in a deadlock situation. The system does not guarantee that it will notice all
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just like you, helping each other. Join them; it only takes a minute: Sign up System calls and EINTR error code up vote 3 down vote favorite Is there any expert out there that can help me http://www.gnu.org/s/libc/manual/html_node/Error-Codes.html with the following? I have the following system calls in C: access() unlink() setsockopt() fcntl() setsid() socket() bind() listen() I want to know if they may fail with error code -1 and errno EINTR/EAGAIN. Should I have to handle EINTR/EAGAIN for these? The documentation do not refer anything related to EINTR/EAGAIN but many people I see handle it. Which is the correct? Here is how I register signal handlers : https://gitorious.org/zepto-web-server/zepto-web-server/source/b1b03b9ecccfe9646e34caf3eb04689e2bbc54dd:src/signal-dispatcher-utility.c With this configuration: http://stackoverflow.com/questions/25729901/system-calls-and-eintr-error-code https://gitorious.org/zepto-web-server/zepto-web-server/source/b1b03b9ecccfe9646e34caf3eb04689e2bbc54dd:src/server-signals-support-utility.c Also here is a commit that I added some EINTR/EAGAIN handling in some system calls that I know that return EINTR or EAGAIN : https://gitorious.org/zepto-web-server/zepto-web-server/commit/b1b03b9ecccfe9646e34caf3eb04689e2bbc54dd c posix interrupt system-calls eintr share|improve this question edited Sep 8 '14 at 18:32 asked Sep 8 '14 at 17:33 Efstathios Chatzikyriakidis 244114 Depending on the platform, on the system call and the SA_RESTART flag, the system call may or may not fail with EINTR. (read in pep-0475) –J.F. Sebastian Sep 8 '14 at 17:37 possible duplicate of Which system calls can return EINTR or EAGAIN error codes? –Andrew Medico Sep 8 '14 at 17:48 I have enabled SA_RESTART. However, I have read that it should be nice to handle also EINTR explicitly. –Efstathios Chatzikyriakidis Sep 8 '14 at 18:06 Any other ideas? Should I handle EINTR for the calls or the SA_RESTART is enough? –Efstathios Chatzikyriakidis Sep 8 '14 at 18:34 EINTR and EAGAIN mean different things. I would recommend always writing code to handle EINTR. If you get EAGAIN when you didn't ask for it, there's a serious logic error either in your program or in the kernel. –tmyklebu Sep 8 '14 at 18:39 | show 1 more comment 3 Answers 3 active oldest votes up vote 1 down vote accepted See ht
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 http://stackoverflow.com/questions/6870158/epoll-wait-fails-due-to-eintr-how-to-remedy-this Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack 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, helping each other. Join them; it only takes a minute: Sign up epoll_wait fails due to EINTR , how error codes to remedy this? up vote 2 down vote favorite My epoll_wait fails due to EINTR. My gdb trace shows this: enter code here 221 in ../nptl/sysdeps/pthread/createthread.c (gdb) 224 in ../nptl/sysdeps/pthread/createthread.c (gdb) [New Thread 0x40988490 (LWP 3589)] 227 in ../nptl/sysdeps/pthread/createthread.c (gdb) epoll_wait error in start timer: Measurement will befor entire duration of execution epoll_wait: Interrupted system call [Thread 0x40988490 (LWP 3589) exited] This string " epoll_wait error eintr error 4 in start timer: Measurement will befor entire duration of execution" is printed by me in stderr. I am not able to make out, how to remedy this EINTR so that epoll_wait can work. Any idea how this EINTR is generated by GDB trace? Please help me (This is urgent). Thanks in advance. c linux system-calls epoll interrupted-exception share|improve this question asked Jul 29 '11 at 7:54 kingsmasher1 3,1051447100 add a comment| 1 Answer 1 active oldest votes up vote 12 down vote accepted Certain signal handler will interrupt epoll_wait(), select() and similar system calls on any Unix or Linux. This is by design so you can interrupt these system calls. You cannot directly remedy it. The typical solution is to explicitly check the errno for EINTR and to execute epoll_wait() again: int nr; do { nr = epoll_wait(epfd, events, maxevents, timeout); } while (nr < 0 && errno == EINTR); Also see: gdb error: Unable to execute epoll_wait: (4) Interrupted system call share|improve this answer answered Jul 29 '11 at 8:16 Codo 38.9k883129 Thanks a lot, i think this will work. Let me try out, will get back tou you in few mins, after i check