#include#include #include "SysCallBase.h" int main() { SysCallBase sc; int uid = getuid(); bool exists = sc.CheckId(SYS_getuid, uid); if (exists) { std::cout << "User ID exists" << std::endl; } else { std::cout << "User ID does not exist" << std::endl; } return 0; }
#includeThis code checks if a user with the username "root" exists on the system using the getpwnam system call. Package library: This code uses the standard C library and the system header files.#include #include "SysCallBase.h" int main() { SysCallBase sc; passwd* entry = getpwnam("root"); bool exists = sc.CheckId(SYS_getpwnam, entry); if (exists) { std::cout << "User exists" << std::endl; } else { std::cout << "User does not exist" << std::endl; } return 0; }