getuid(2) System Calls Manual getuid(2) getuid, geteuid - LIBRARY Standard C library (libc, -lc) #include uid_t getuid(void); uid_t geteuid(void); getuid() (ID) . geteuid() . These functions are always successful and never modify errno. POSIX.1-2008. POSIX.1-2001, 4.3BSD. UNIX V6 getuid() (euid << 8) + uid. UNIX V7 getuid() geteuid(). getuid() geteuid() Linux 16- . Linux 2.4 getuid32() geteuid32(), 32- . glibc getuid() geteuid() . Alpha getuid() geteuid() getxuid(), UID. glibc getuid() geteuid() . syscall(2). . getresuid(2), setreuid(2), setuid(2), credentials(7) Azamat Hackimov , Dmitry Bolkhovskikh , Vladislav , Yuri Kozlov ; GNU 3 , . . , , . Linux man-pages 6.06 31 2023 . getuid(2)