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Questions tagged [eintr]

EINTR is a POSIX error code indicating that a system call was interrupted by a signal. Consider using this tag alongside more popular tags such as [signals] or [posix] for questions about this error.

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When to check for EINTR and repeat the function call?

I am programming a user application for a embedded Linux system, and I am using the common functions such as open, close, read, ioctl, etc. for the devices. Now, I read about EINTR, indicates that the function was interrupted by a signal, but I am…
stefangachter
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EINTR and non-blocking calls

As is known, some blocking calls like read and write would return -1 and set errno to EINTR, and we need handle this. My question is: Does this apply for non-blocking calls, e.g, set socket to O_NONBLOCK? Since some articles and sources I have read…
haohaolee
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System call interrupted by a signal still has to be completed

A lot of system calls like close( fd ) Can be interrupted by a signal. In this case usually -1 is returned and errno is set EINTR. The question is what is the right thing to do? Say, I still want this fd to be closed. What I can come up with…
Shamdor
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Proper error handling for fclose impossible (according to manpage)?

So I'm studying fclose manpage for quite I while and my conclusion is that if fclose is interrupted by some signal, according to the manpage there is no way to recover...? Am I missing some point? Usually, with unbuffered POSIX functions (open,…
boo-hoo
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Unit testing error conditions - EINTR

In short, how do you unit test an error condition such as EINTR on a system call. One particular example I'm working on, which could be a case all by itself, is whether it's necessary to call fclose again when it returns EOF with (errno==EINTR). The…
Michael Smith
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ERROR: could not open file "base/.../...": Interrupted system call

After trying to run PostgreSQL 9.1 on Amazon Web Services this error has been turning up in the database and application logs. Reinstalling on a different AWS VM has not helped. Strangely the error goes a way after a few moments of activity, only to…
Paul R Rogers
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System calls and EINTR error code

Is there any expert out there that can help me 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…
Efstathios Chatzikyriakidis
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Why does select() keep failing with EINTR errno?

I have a C++ application that includes this function: int mySelect(const int fdMaxPlus1, fd_set *readFDset, fd_set *writeFDset, struct timeval *timeout) { retry: const int selectReturn = ::select(fdMaxPlus1,…
WilliamKF
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Blocking functions and EINTR

Many POSIX blocking functions return EINTR in case of a signal. The idea is that signal handler sets a flag first (say 'stop' flag in case of SIGINT), then the blocking function unblocks returning EINTR and the application sees the flag and performs…
Martin Sustrik
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python: functions from math and os modules are interrupted by EINTR

I have linux board on samsung SoC s3c6410 (ARM11). I build rootfs with buildroot: Python 2.7.1, uClibc-0.9.31. Linux kernel: Linux buildroot 2.6.28.6 #177 Mon Oct 3 12:50:57 EEST 2011 armv6l GNU/Linux My app, written on python, in some mysterios…
void
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Handling EINTR (with goto?)

Background: This is a follow-up question to this thread about handling EINTR for system calls in C++ (Linux/GCC). Regardless of whether or not I intend to profile my application, it seems like I should be handling system calls setting errno to…
Chris Tonkinson
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Python: Do I need to catch EINTR in a pipe-reading loop

tl;dr Should I handle EINTR "system call interrupted" errors when reading a pipe in Python, and if so, how do I test such code? Description In the traceback below, self._dataq is a multiprocessing.Queue (technically, I'm using the billiard library,…
wkschwartz
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When does the wait() function (in LINUX) respond to interrupts?

I have c code as such int childid; int parentid; void siginthandler(int param) { // if this is the parent process if(getpid() == parentid){ //handler code which sends SIGINT signal to child process kill(childid, SIGINT); } else // if this is…
piedpiper
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Any workarounds for Python's select and handling of EINTR in Linux?

In one of my recent projects I happened to have in the same process (a Python program, its a multithreaded application): a Boost::Python module to a library that linked against the AVT PvAPI SDK, i.e. in the widest sense a driver to get image…
moooeeeep
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epoll_wait() returns EINTR infinitely

I have a thread responsible for polling various fds. I am using epoll_wait with timeout set. Following is the code snippet: do { n = epoll_wait(epollFd, eventsList, eventsTotal, timeoutMS); } while ((n<0) && (errno == EINTR)); eventsList…
himdeep pathak
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