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GETUID(2) System Calls Manual GETUID(2) NAME getuid, geteuid - get user identification LIBRARY Standard C Library (libc, -lc) SYNOPSIS #include <unistd.h> uid_t getuid(void); uid_t geteuid(void); DESCRIPTION The getuid() function returns the real user ID of the calling process. The geteuid() function returns the effective user ID of the calling process. The real user ID is that of the user who has invoked the program. As the effective user ID gives the process additional permissions during execution of "set-user-ID" mode processes, getuid() is used to determine the real-user-id of the calling process. ERRORS The getuid() and geteuid() functions are always successful, and no return value is reserved to indicate an error. SEE ALSO getgid(2), setreuid(2) STANDARDS The geteuid() and getuid() functions conform to IEEE Std 1003.1-1990 ("POSIX.1"). HISTORY The getuid() function appeared in Version 4 AT&T UNIX. NetBSD 8.0 April 3, 2010 NetBSD 8.0