GETUID Section: Linux Programmer's Manual (2) Updated: 23 July 2025 Index   NAME getuid, geteuid - get user identity   SYNOPSIS #include <unistd.h> #include <sys/types.h> uid_t getuid(void); uid_t geteuid(void);   DESCRIPTION getuid returns the real user ID of the current process. geteuid returns the effective user ID of the current process. The real ID corresponds to the ID of the calling process. The effective ID corresponds to the set ID bit on the file being executed.   ERRORS These functions are always successful.   CONFORMING TO POSIX, BSD 4.3.   SEE ALSO   Index NAME SYNOPSIS DESCRIPTION ERRORS CONFORMING TO SEE ALSO This document was created by using the manual pages. Time: 11:56:06 GMT, March 24, 2025