#5060: iteratee: epollControl: permission denied (Operation not permitted)
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Reporter: pacak | Owner:
Type: bug | Status: new
Priority: normal | Component: GHCi
Version: 7.0.3 | Keywords:
Testcase: | Blockedby:
Os: Linux | Blocking:
Architecture: x86_64 (amd64) | Failure: Incorrect result at runtime
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Comment(by pacak):
Replying to [comment:5 tibbe]:
> Replying to [comment:4 pacak]:
> That's odd. The I/O manager should be using `epoll` on Linux.
It should. But if it really used it - iteratee would be completly broken
in all regular file operations. It uses the same interface to poll fd for
data. This works for sockets and stuff but fails for regular files:
{{{
#include <sys/epoll.h>
#include <stdio.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <errno.h>
int main(int argc, char *argv[]) {
int fd = open("/etc/passwd", O_RDONLY);
int efd = epoll_create(5);
struct epoll_event ev = { 0, { 0 } };
ev.events = EPOLLOUT;
ev.data.fd = fd;
if (epoll_ctl(efd, EPOLL_CTL_ADD, fd, &ev) < 0) {
perror("Failed to add fd to event set");
}
return 0;
}
}}}
It seems, that they do not support poll at all.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5060#comment:6>
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