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- .Dd December 1, 2017
- .Dt GETUID 2
- .Os
- .Sh NAME
- .Nm getuid ,
- .Nm geteuid
- .Nd get user identification
- .Sh LIBRARY
- .Lb libc
- .Sh SYNOPSIS
- .In unistd.h
- .Ft uid_t
- .Fn getuid void
- .Ft uid_t
- .Fn geteuid void
- .Sh DESCRIPTION
- The
- .Fn getuid
- system call returns the real user ID of the calling process.
- The
- .Fn geteuid
- system call
- returns the effective user ID of the calling process.
- .Pp
- 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
- .Dq Em set-user-ID
- mode processes,
- .Fn getuid
- is used to determine the real-user-id of the calling process.
- .Sh ERRORS
- The
- .Fn getuid
- and
- .Fn geteuid
- system calls are always successful, and no return value is reserved to
- indicate an error.
- .Sh SEE ALSO
- .Xr getgid 2 ,
- .Xr issetugid 2 ,
- .Xr setgid 2 ,
- .Xr setreuid 2 ,
- .Xr setuid 2
- .Sh STANDARDS
- The
- .Fn geteuid
- and
- .Fn getuid
- system calls are expected to conform to
- .St -p1003.1-90 .
- .Sh HISTORY
- The
- .Fn getuid
- function appeared in
- .At v1 .
- The
- .Fn geteuid
- function appeared in
- .At v4 .
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