On 09/07/2022 10:10, zeneca wrote:
Le 9/07/22 à 10:18, Richard Kettlewell a écrit :
zeneca <pasIci@ailleur.fr> writes:
Le 8/07/22 à 18:37, Martin Gregorie a écrit :
On Fri, 08 Jul 2022 18:05:40 +0200, Deloptes wrote:
zeneca wrote:
I am trying to compile a small prog with inotify but compilation
fail:
Inotify.c:19:8: warning: implicit declaration of function
‘q’
[-Wimplicit-function-declaration]
fd = inotify_init();
^~~~~~~~~~~~
Inotify.c:27:8: warning: implicit declaration of function
‘inotify_add_watch’ [-Wimplicit-function-declaration]
wd = inotify_add_watch( fd,
"/sys/bus/w1/devices/28-000003f1a254/temperature", IN_MODIFY |
IN_DELETE ); ..
..
Any idea??
Many thanks
how are you calling the compiler. You should be using -I (for the
includes)
and -L (for the library path)
something like
gcc -I/usr/include -L/usr/lib -l somelib source.c -o output.bin
This is a bad guess for two reasons:
* GCC already searches in the right places, there is no need to specify
extra -I or -L options for system headers and libraries.
* The error isn’t about a #include file or library not being found.
Adding -I or -L options will not make any difference.
Looks like your source should have the following among the other
includes:
#include <sys/inotify.h>
Have you run "man inotify" and read its descriptionof the inotify
APIs?
#include <linux/inotify.h>
That will not work. As the man page says, it should be <sys/inotify.h>.
As I said, there is no /usr/include/sys/ directory on Raspberry
On Centos7.9 there are
/usr/include/sys/inotify.h AND
/usr/include/linux/inotify.h
on Centos7.9 the very same program run with #include <linux/inotify.h>
but compile fail on raspberry.
$find /usr/include -name inotify.h
/usr/include/linux/inotify.h
/usr/include/arm-linux-gnueabihf/bits/inotify.h /usr/include/arm-linux-gnueabihf/sys/inotify.h
On my pi these are 3 different file lengths
$ ls -l /usr/include/linux/inotify.h
-rw-r--r-- 1 root root 2914 Mar 31 2018 /usr/include/linux/inotify.h
$ ls -l /usr/include/arm-linux-gnueabihf/bits/inotify.h
-rw-r--r-- 1 root root 1079 Feb 6 2019 /usr/include/arm-linux-gnueabihf/bits/inotify.h
$ ls -l /usr/include/arm-linux-gnueabihf/sys/inotify.h
-rw-r--r-- 1 root root 3837 Feb 6 2019 /usr/include/arm-linux-gnueabihf/sys/inotify.h
This suggests that (a) there is an implicit preload of the include path
/usr/include/arm-linux-gnueabihf/
and (b) that if <sys/inotify.h> works that is in fact the correct file
Or (c) that richard and the man page are wrong.
--
“Ideas are inherently conservative. They yield not to the attack of
other ideas but to the massive onslaught of circumstance"
- John K Galbraith
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