On Tue, 08 Sep 2020 10:24:06 -0400, in gmane.comp.hardware.beagleboard.user
Dennis Lee Bieber <[email protected]>
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
--
For more options, visit http://beagleboard.org/discuss
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