Writing a Unix Daemon
NS
I am trying to write a UNIX daemon and I happened to come across a
sample at this link: http://www.enderunix.org/docs/eng/daemon.php
I downloaded the examped.c program and when I trying to compile it I
keep getting the following error message (since we don't have the C
compiler installed I had to use gcc compiler). The UNIX OS that I am
using is Sun 5.9
Start of error message
-----------------------------------------------------------------------------------------------------------------------------------------------------
In file included from
/tool/depot/cygnus-95q4/lib/gcc-lib/sparc-sun-solaris2.5/2.7-95q4/include/time.h:90,
from /usr/include/sys/time.h:418,
from /usr/include/sys/select.h:20,
from
/tool/depot/cygnus-95q4/lib/gcc-lib/sparc-sun-solaris2.5/2.7-95q4/include/sys/types.h:278,
from /usr/include/fcntl.h:23,
from examped.c:14:
/usr/include/sys/siginfo.h:74: syntax error before `pthread_attr_t'
In file included from
/tool/depot/cygnus-95q4/lib/gcc-lib/sparc-sun-solaris2.5/2.7-95q4/include/time.h:90,
from /usr/include/sys/time.h:418,
from /usr/include/sys/select.h:20,
from
/tool/depot/cygnus-95q4/lib/gcc-lib/sparc-sun-solaris2.5/2.7-95q4/include/sys/types.h:278,
from /usr/include/fcntl.h:23,
from examped.c:14:
/usr/include/sys/siginfo.h:284: syntax error before `int32_t'
/usr/include/sys/siginfo.h:415: syntax error before `int32_t'
-----------------------------------------------------------------------------------------------------------------------------------------------------
End of error message
I am essentially trying to build a daemon that can sense changes made
to a particular file and then do some actions based on the type of
change made to that file.
Any help in this matter is greatly appreciated.
Thanks,
NS
Gordon Burditt
>sample at this link: http://www.enderunix.org/docs/eng/daemon.php
>
> I downloaded the examped.c program and when I trying to compile it I
>keep getting the following error message (since we don't have the C
>compiler installed I had to use gcc compiler). The UNIX OS that I am
>using is Sun 5.9
If you get syntax errors in system include files, it probably means
that you forgot to include a prerequesite include file FIRST that
defines some typedefs. <sys/types.h> is often a prerequesite for <sys/*.h>.
What include file defines int32_t (<inttypes.h>?) and pthread_attr_t?
Gordon L. Burditt
Spoon
> What include file defines int32_t (<inttypes.h>?)
http://www.opengroup.org/onlinepubs/000095399/basedefs/stdint.h.html
> and pthread_attr_t?
http://www.opengroup.org/onlinepubs/000095399/basedefs/sys/types.h.html
NS
Thanks for your response. I included both <stdint.h> and <sys/types.h>
and when try to compile it I am getting following error.
Start of error message
--------------------------------------------------------------------------------
examped.c:17: stdint.h: No such file or directory
--------------------------------------------------------------------------------
End of error message
Does this mean that I don't have the stdint.h file or am I not
including any prerequisites?
Thanks and really appreciate your help.
Thanks,
NS
NS
I was able get the examped.c program (which is available at the above
mentioned link) compiled after I followed your suggestions. I had to
include the following headers to compile the sample.
#include </usr/include/sys/types.h>
#include </usr/include/sys/int_types.h>
#include <stdio.h>
#include <fcntl.h>
#include <signal.h>
#include <unistd.h>
Now I am trying to see if I create my own daemon program based on this
example.
As I mentioned earlier, what I am trying to do is to create a daemon
that will watch a specific file and upon any edits to that file, the
daemon will spawn a child process to execute certain tasks based on the
type of modification done the file and then report back to the daemon
server.
Since I am very new to writing daemons, if you could give me some
pointers or examples on how to achieve what I described, it would have
great help.
Thanks again,
NS