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getuid(2) [osf1 man page]

getuid(2)							System Calls Manual							 getuid(2)

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 developed for multiple platforms. The additional #include statement is not required on Tru64 UNIX systems or by ISO or X/Open standards, but may be required on other vendors' systems that conform to these standards. STANDARDS
Interfaces documented on this reference page conform to industry standards as follows: getuid(): POSIX.1, XPG4, XPG4-UNIX Refer to the standards(5) reference page for more information about industry 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)

Check Out this Related Man Page

GETUID(2)						      BSD System Calls Manual							 GETUID(2)

getuid, geteuid -- get user identification LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <unistd.h> #include <sys/types.h> uid_t getuid(void); uid_t geteuid(void); DESCRIPTION
The getuid() system call returns the real user ID of the calling process. The geteuid() system call 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() system calls are always successful, and no return value is reserved to indicate an error. SEE ALSO
getgid(2), issetugid(2), setgid(2), setreuid(2), setuid(2) STANDARDS
The geteuid() and getuid() system calls are expected to conform to ISO/IEC 9945-1:1990 (``POSIX.1''). HISTORY
The getuid() and geteuid() functions appeared in Version 7 AT&T UNIX. BSD
June 4, 1993 BSD
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