inotify usage of FreeBSD

[HofiOne]

I am not sure if it's supported, please close this issue if not.

I tried to build from source the master branch of ivykis on FreeBSD.

FreeBSD 14.1-RELEASE releng/14.1-n267679-10e31f0946d8 GENERIC amd64

I have libinotify installed

pkg info libinotify-20240724

libinotify-20240724
Name           : libinotify
Version        : 20240724
Installed on   : Fri Sep 13 12:46:22 2024 CEST
Origin         : devel/libinotify
Architecture   : FreeBSD:14:amd64

When configuring ivykis

git clone https://github.com/buytenh/ivykis.git .
autoreconf --install
./configure

i found that inotify is not detected

checking for inotify_init... no

Is this a bug in the discovery, in my env, or is this not supported at all?
TIA!

[HofiOne]

seems to me an ivykis issue on detecting inotify presence

the relevant config.log part

configure:14694: checking for inotify_init
configure:14694: clang -o conftest -I/usr/local/include/ -Wall  -L/usr/local/lib conftest.c  >&5
ld: error: undefined symbol: inotify_init
>>> referenced by conftest.c
>>>               /tmp/conftest-3e093f.o:(main)
clang: error: linker command failed with exit code 1 (use -v to see invocation)
configure:14694: $? = 1
configure: failed program was:
| /* confdefs.h */
| #define PACKAGE_NAME "ivykis"
| #define PACKAGE_TARNAME "ivykis"
| #define PACKAGE_VERSION "0.43.2"
| #define PACKAGE_STRING "ivykis 0.43.2"
| #define PACKAGE_BUGREPORT "libivykis-discuss@lists.sourceforge.net"
| #define PACKAGE_URL ""
| #define PACKAGE "ivykis"
| #define VERSION "0.43.2"
| #define HAVE_STDIO_H 1
| #define HAVE_STDLIB_H 1
| #define HAVE_STRING_H 1
| #define HAVE_INTTYPES_H 1
| #define HAVE_STDINT_H 1
| #define HAVE_STRINGS_H 1
| #define HAVE_SYS_STAT_H 1
| #define HAVE_SYS_TYPES_H 1
| #define HAVE_UNISTD_H 1
| #define STDC_HEADERS 1
| #define HAVE_DLFCN_H 1
| #define LT_OBJDIR ".libs/"
| #define HAVE_LIBC_NONSHARED 1
| #define HAVE_SYS_EVENTFD_H 1
| #define HAVE_SYS_SYSCALL_H 1
| #define HAVE_SYS_THR_H 1
| #define HAVE_PTHREAD_SPIN_TRYLOCK 1
| #define HAVE_PRAGMA_WEAK 1
| #define HAVE_CLOCK_GETTIME 1
| #define HAVE_CLOCK_MONOTONIC 1
| #define HAVE_CLOCK_MONOTONIC_FAST 1
| #define HAVE_CLOCK_REALTIME 1
| #define HAVE_EVENTFD 1
| /* end confdefs.h.  */
| /* Define inotify_init to an innocuous variant, in case <limits.h> declares inotify_init.
|    For example, HP-UX 11i <limits.h> declares gettimeofday.  */
| #define inotify_init innocuous_inotify_init
| 
| /* System header to define __stub macros and hopefully few prototypes,
|    which can conflict with char inotify_init (void); below.  */
| 
| #include <limits.h>
| #undef inotify_init
| 
| /* Override any GCC internal prototype to avoid an error.
|    Use char because int might match the return type of a GCC
|    builtin and then its argument prototype would still apply.  */
| #ifdef __cplusplus
| extern "C"
| #endif
| char inotify_init (void);
| /* The GNU C library defines this for functions which it implements
|     to always fail with ENOSYS.  Some functions are actually named
|     something starting with __ and the normal name is an alias.  */
| #if defined __stub_inotify_init || defined __stub___inotify_init
| choke me
| #endif
| 
| int
| main (void)
| {
| return inotify_init ();
|   ;
|   return 0;
| }
configure:14694: result: no

seems the inotify lib cannot be linked somehow, though it is presented

ls /usr/local/lib/libinot*
-rw-r--r--  1 root wheel 52510 Sep  5 03:04 /usr/local/lib/libinotify.a
lrwxr-xr-x  1 root wheel    19 Sep  5 03:04 /usr/local/lib/libinotify.so -> libinotify.so.0.0.0
lrwxr-xr-x  1 root wheel    19 Sep  5 03:04 /usr/local/lib/libinotify.so.0 -> libinotify.so.0.0.0
-rwxr-xr-x  1 root wheel 29848 Sep  5 03:04 /usr/local/lib/libinotify.so.0.0.0

[buytenh]

Some googling suggests that FreeBSD does not support inotify directly
in the kernel like Linux does, and that libinotify emulates the Linux
inotify system call API on top of kqueue.

The ivykis configure.ac file assumes that if inotify is supported on
the machine we are compiling on, inotify_init can be called without
having to link against any particular libraries. This assumption holds
on Linux, but it would not hold on a FreeBSD system where libinotify
is used to provide the inotify API.

I don't know whether libinotify provides a compatible enough API for
ivykis to be able to make use of, but you could try adding an
AC_CHECK_LIB([inotify], [inotify_init]) directive to configure.ac
and then regenerating the various autoconf files to see if that makes
it work.

[HofiOne]

Yes, I guess (Free)BSD uses https://github.com/libinotify-kqueue/libinotify-kqueue that is a wrapper around kqueue.

I've built a version of syslog-ng based on the modified ivykis, directory monitoring worked nicely (unfortunately there is no inotify based file polling yet, so i could not test that)
So, I guess it could work seamlessly on BSD systems as well

But, meanwhile I turned off inotify usage of syslog-ng on (Free)BSD as

• the wrapped kqueue is already supported natively in ivykis, meaningless to have a wrapper around it
• ivykis currently supports only directory monitoring via inotify

I close this for now, thanks for your time!