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getuid(2) System Calls Manual getuid(2) NAME getuid, geteuid - Gets the real or effective user ID SYNOPSIS #include <unistd.h> uid_t getuid( void ); uid_t geteuid( void ); Application developers may want to specify an #include statement for <sys/types.h> before the one for <unistd.h> if programs are being de- veloped for multiple platforms. The additional #include statement is not required on DIGITAL UNIX systems or by ISO or X/Open standards, but may be required on other vendors' systems that conform to these stan- dards. STANDARDS Interfaces documented on this reference page conform to industry stan- dards as follows: getuid(): POSIX.1, XPG4, XPG4-UNIX Refer to the standards(5) reference page for more information about in- dustry standards and associated tags. 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. RELATED INFORMATION Functions: setuid(2), setruid(3), setreuid(2) Standards: standards(5) delim off getuid(2)