Yes, I proceeded in the same way ... as Dennis Bieber suggested: so adding
of *#include <unistd.h>* resolves the issue.
On Tuesday, September 8, 2020 at 7:46:03 PM UTC+2, jonnymo wrote:
>
> What worked for you? I cloned the code from the link you provided and the
> syscall code has build errors.
>
> What I did to clear this out was:
> 1. In "syscall.cpp", I added 'unistd.h' to the includes:
> Ex:
> #include <unistd.h>
>
> 2. I did the same in callchmod.cpp,
>
> 3. Run ./build
>
> Apparently there is an issue with unistd.h not being added in certain
> areas with gcc.
>
> Cheers,
>
> Jon
>
>
>
> On Tue, Sep 8, 2020 at 9:05 AM Pavel Yermolenko <py....@sunrise.ch
> <javascript:>> wrote:
>
>>
>>
>> On Tuesday, September 8, 2020 at 4:35:43 PM UTC+2, Dennis Bieber wrote:
>>>
>>> On Tue, 08 Sep 2020 10:24:06 -0400, in
>>> gmane.comp.hardware.beagleboard.user
>>> Dennis Lee Bieber <
>>> dennis.l.bieber-re5jqeeqqe8avxtiumw...@public.gmane.org>
>>> wrote:
>>>
>>>
>>> As a follow-up, using YOUR source, I added one line (and changed
>>> the
>>> file name)
>>>
>>> -=-=-=-
>>> debian@beaglebone:~/exploring$ cat test.cpp
>>> #include<gnu/libc-version.h>
>>> #include<sys/syscall.h>
>>> #include<sys/types.h>
>>> #include<iostream>
>>> #include<signal.h>
>>>
>>> #include
>>> <unistd.h> <===================
>>>
>>> using namespace std;
>>>
>>> int main(){
>>> //gnu_get_libc_version() returns a string that identifies the
>>> //glibc version available on the system.
>>> cout << "The GNU libc version is " << gnu_get_libc_version() << endl;
>>>
>>> // process id tid is thread identifier
>>> // look inside sys/syscall.h for System Call Numbers
>>> pid_t tid; //pid_t is of type integer
>>> tid = syscall(SYS_gettid); // make a system call to get the process
>>> id
>>> cout << "The Current PID is: " << tid << endl;
>>> //can also get by calling getpid() function from signal.h
>>> cout << "The Current PID is: " << getpid() << endl;
>>>
>>> // Can get current UserID by using:
>>> int uid = syscall(SYS_getuid);
>>> cout << "It is being run by user with ID: " << uid << endl;
>>> // or getting the value from syscalls.kernelgrok.com
>>> uid = syscall(0xc7);
>>> cout << "It is being run by user with ID: " << uid << endl;
>>>
>>> return 0;
>>> }
>>> debian@beaglebone:~/exploring$
>>> -=-=-=-
>>> debian@beaglebone:~/exploring$ g++ test.cpp -o test
>>> debian@beaglebone:~/exploring$ ./test
>>> The GNU libc version is 2.28
>>> The Current PID is: 2396
>>> The Current PID is: 2396
>>> It is being run by user with ID: 1000
>>> It is being run by user with ID: 1000
>>> debian@beaglebone:~/exploring$
>>>
>>>
>>> The example program in the second edition has that line.
>>>
>>>
>>> --
>>> Dennis L Bieber
>>>
>>
>> Works ! Thanks.
>> Concerning 2nd ed, as I mentioned, I used link form 2nd edition.
>>
>> --
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>>
>
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