getuid(2) [netbsd man page]
GETUID(2) BSD 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 ISO/IEC 9945-1:1990 (``POSIX.1''). HISTORY
The getuid() function appeared in Version 4 AT&T UNIX. BSD
April 3, 2010 BSD
Check Out this Related Man Page
GETUID(2) Linux Programmer's Manual GETUID(2) 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 calling process. geteuid() returns the effective user ID of the calling process. ERRORS
These functions are always successful. CONFORMING TO
POSIX.1-2001, 4.3BSD. NOTES
History In UNIX V6 the getuid() call returned (euid << 8) + uid. UNIX V7 introduced separate calls getuid() and geteuid(). The original Linux getuid() and geteuid() system calls supported only 16-bit user IDs. Subsequently, Linux 2.4 added getuid32() and geteuid32(), supporting 32-bit IDs. The glibc getuid() and geteuid() wrapper functions transparently deal with the variations across ker- nel versions. SEE ALSO
getresuid(2), setreuid(2), setuid(2), credentials(7) COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. Linux 2010-11-22 GETUID(2)