bsd/man/man2/getuid.2

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  34 .\"     @(#)getuid.2    8.1 (Berkeley) 6/4/93
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  36 .Dd June 4, 1993
  37 .Dt GETUID 2
  38 .Os BSD 4
  39 .Sh NAME
  40 .Nm getuid ,
  41 .Nm geteuid
  42 .Nd get user identification
  43 .Sh SYNOPSIS
  44 .Fd #include <sys/types.h>
  45 .Fd #include <unistd.h>
  46 .Ft uid_t
  47 .Fn getuid void
  48 .Ft uid_t
  49 .Fn geteuid void
  50 .Sh DESCRIPTION
  51 The
  52 .Fn getuid
  53 function returns the real user ID of the calling process.
  54 The
  55 .Fn geteuid
  56 function
  57 returns the effective user ID of the calling process.
  58 .Pp
  59 The real user ID is that of the user who has invoked the program.
  60 As the effective user ID
  61 gives the process additional permissions during
  62 execution of
  63 .Dq Em set-user-ID
  64 mode processes,
  65 .Fn getuid
  66 is used to determine the real-user-id of the calling process.
  67 .Sh ERRORS
  68 The
  69 .Fn getuid
  70 and
  71 .Fn geteuid
  72 functions are always successful, and no return value is reserved to
  73 indicate an error.
  74 .Sh SEE ALSO
  75 .Xr getgid 2 ,
  76 .Xr setreuid 2
  77 .Sh STANDARDS
  78 .Fn Geteuid
  79 and
  80 .Fn getuid
  81 functions conform to
  82 .St -p1003.1-88 .