get username NAME getlogin, getlogin_r, cuserid - get username LIBRARY Standard C library ( libc , -lc ) SYNOPSIS #include <unistd.h> cha...get username NAME getlogin, getlogin_r, cuserid - get username LIBRARY Standard C library ( libc , -lc ) SYNOPSIS #include <unistd.h> cha...get username NAME getlogin, getlogin_r, cuserid - get username LIBRARY Standard C library ( libc , -lc ) SYNOPSIS #include <unistd.h> cha......oving their current definitions with #undef : BUFSIZ , EOF , FILENAME_MAX , FOPEN_MAX , L_cuserid , L_ctermid , L_tmpnam , NULL , SEEK_END , SEEK_SET , SEEK_CUR , TMP_MAX , clea…