Thanks Bryan. Indeed in the zone /opt/local/bin/touch is used.
But I still see the issue:
open(filename, O_WRONLY|O_NONBLOCK|O_CREAT|O_NOCTTY, 0666) is a file open
operation and should result in no IN_CREATE event if the file exists
(O_CREAT - Create the file if it does not exist).
I used the following C program to test this file open behavior on Linux and
SmartOS, as you can see, on SmartOS, it causes a IN_CREATE inotify event,
while on Linux, it triggers nothing. This happens both in global zone and
OS zone.
I am confused.
Thanks,
--Youzhong
-----------------------------------------------------------
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
int main(int argc, char *argv[])
{
int fd;
char *filename;
if(argc > 1) {
filename = argv[1];
} else {
printf("No filename specified!\n");
exit(1);
}
fd = open(filename, O_WRONLY|O_NONBLOCK|O_CREAT|O_NOCTTY, 0666);
if(fd == -1) {
perror("open");
exit(1);
}
close(fd);
return 0;
}
On Wed, Dec 10, 2014 at 1:05 PM, Bryan Cantrill <bryancantr...@gmail.com>
wrote:
>
> The touch differences can be explained by the touch(1) that you're using:
> in the global zone, you're using /usr/bin/touch, but in the non-global, I
> imagine that you're using /opt/local/bin/touch. These two implementations
> differ, so not a huge surprise that their implementation details differ.
>
> As for FIONREAD: indeed, that seems screwed up -- it seems to be returning
> the number of bytes instead of storing in in the specified argument. I'll
> get that fixed today...
>
> - Bryan
>
>
>
> On Wed, Dec 10, 2014 at 8:00 AM, Youzhong Yang via smartos-discuss <
> smartos-discuss@lists.smartos.org> wrote:
>
>> Hello again,
>>
>> I downloaded smartos latest image (joyent_20141127T173954Z) and tested
>> inotify using it.
>>
>> Two issues were observed:
>>
>> 1. ioctl(fd, FIONREAD, ...) does not work as expected. It does not return
>> the number of bytes that are available to be read on an inotify instance.
>>
>> 2. In an OS zone, touching a file always generates an IN_CREATE event,
>> even though the file already exists. This only happens in an OS zone, not
>> in global zone.
>>
>> Attached is the test program I used for testing. Just compile and run it,
>> then in another terminal window, 'touch /tmp/file' twice. Please look at
>> the details at the end of this e-mail.
>>
>> Thanks,
>>
>> -Youzhong
>>
>> --- In global zone ---
>> [root@batfs5999 /var/tmp]# ./inotify
>> ioctl = 64, errno = 0, bufsize = 0
>> got 48 bytes
>> :: mask 256
>> -> New file file created
>> :: mask 4
>> -> file ATTRIB
>> ioctl = 32, errno = 0, bufsize = 0
>> got 24 bytes
>> :: mask 4
>> -> file ATTRIB
>>
>> --- In OS zone ---
>> [root@batfs5999-cifs0 /var/tmp]# ./inotify
>> ioctl = 64, errno = 0, bufsize = 0
>> got 48 bytes
>> :: mask 256
>> -> New file file created
>> :: mask 4
>> -> file ATTRIB
>> ioctl = 64, errno = 0, bufsize = 0
>> got 48 bytes
>> :: mask 256
>> -> New file file created
>> :: mask 4
>> -> file ATTRIB
>>
>> --- On Linux ---
>> % ./inotify
>> ioctl = 0, errno = 0, bufsize = 32
>> got 32 bytes
>> :: mask 256
>> -> New file file created
>> ioctl = 0, errno = 0, bufsize = 32
>> got 32 bytes
>> :: mask 4
>> -> file ATTRIB
>> ioctl = 0, errno = 0, bufsize = 32
>> got 32 bytes
>> :: mask 4
>> -> file ATTRIB
>>
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