I've been looking to start using the KEvent system and I've been
experimenting with it. However I've been having several problems, with my
own code as well as samples from http://www.flugsvamp.org.
It appears I am able to create the correct structure's and register the
events. However the event never returns and never responds to any action.
For example if I use a sample which monitors the actions on a file I can
read from, and write to the file and it shows no sign of noticing.
I was wondering if it's simply a mistake of my own, however the failure for
the samples I've found has puzzled my further. I'm working on a 4.3-STABLE
machine using GCC version 2.95.3.
Here is an example of code that I am using which doesn't seem to catch any
events. Its a slightly modified version of read_test.c from flugsvamp.com
which I edit so it would compile happily.
It doesn't seem to work however.
>
#include <stdio.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include <aio.h>
#include <sys/errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/event.h>
#include <sys/time.h>
#include <sys/syscall.h>
main(int argc, char **argv)
{
int fd, kq, n;
struct kevent event[1];
struct kevent *evp[1];
char buffer[128];
struct stat st;
struct aiocb iocb;
struct timespec ts = {0, 0};
if (argc != 2)
errx(1, "Usage: %s file\n", argv[0]);
fd = open(argv[1], O_RDONLY);
if (fd < 0)
err(1, "open: %s\n", argv[1]);
lseek(fd, 0, SEEK_END);
kq = syscall(SYS_kqueue);
if (kq < 0)
err(1, "kqueue");
event[0].ident = fd;
event[0].filter = EVFILT_READ;
event[0].flags = EV_ADD | EV_ENABLE;
evp[0] = &event[0];
n = syscall(SYS_kevent, kq, 1, evp, 0, NULL, 0);
for (;;) {
n = syscall(SYS_kevent, kq, 0, NULL, 1, event, ts);
if (n < 0)
err(1, "kevent");
printf("kevent flags: 0x%x, data: 0x%x\n",
event[0].flags, event[0].data);
n = read(fd, buffer, 128);
buffer[n] = '\0';
printf("%s", buffer);
}
}
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I'd appreciate any feedback very much.
Thank you
Dominic Marks
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