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.oh...@sunrise.ch> 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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