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geteuid(2freebsd)

December 1, 2017

freebsd-manpages

Manual pages for a GNU/kFreeBSD system

NAME

getuid, geteuid - get user identification

LIBRARY


.Lb libc

SYNOPSIS


.In unistd.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.

STANDARDS

The geteuid and getuid system calls are expected to conform to -p1003.1-90.

HISTORY

The getuid function appeared in AT&T v1 . The geteuid function appeared in AT&T v4 .
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