man2/getuid.2

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   3 .\" Copyright 1993 Rickard E. Faith (faith@cs.unc.edu)
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  26 .TH GETUID 2 1993-07-23 "Linux" "Linux Programmer's Manual"
  27 .SH NAME
  28 getuid, geteuid \- get user identity
  29 .SH SYNOPSIS
  30 .B #include <unistd.h>
  31 .br
  32 .B #include <sys/types.h>
  33 .sp
  34 .B uid_t getuid(void);
  35 .br
  36 .B uid_t geteuid(void);
  37 .SH DESCRIPTION
  38 .BR getuid ()
  39 returns the real user ID of the calling process.
  40
  41 .BR geteuid ()
  42 returns the effective user ID of the calling process.
  43 .SH ERRORS
  44 These functions are always successful.
  45 .SH "CONFORMING TO"
  46 POSIX.1-2001, 4.3BSD.
  47 .SH NOTES
  48 .SS History
  49 In Unix V6 the
  50 .BR getuid ()
  51 call returned (euid << 8) + uid.
  52 Unix V7 introduced separate calls
  53 .BR getuid ()
  54 and
  55 .BR geteuid ().
  56 .SH "SEE ALSO"
  57 .BR getresuid (2),
  58 .BR setreuid (2),
  59 .BR setuid (2),
  60 .BR credentials (7)