GETUID(2FREEBSD) - man page online | system calls

Get user identification.

June 4, 1993
GETUID(2)                            BSD System Calls Manual                            GETUID(2)

NAME 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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getuid(2freebsd) referred by
refer to getgid(2) | getuid(2) | issetugid(2freebsd) | setgid(2) | setreuid(2) | setuid(2)