man2/getresuid.2

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  25 .\" Modified, 2003-05-26, Michael Kerrisk, <mtk-manpages@gmx.net>
  26 .TH GETRESUID 2 2003-05-26 "Linux 2.4" "Linux Programmer's Manual"
  27 .SH NAME
  28 getresuid, getresgid \- get real, effective and saved user or group ID
  29 .SH SYNOPSIS
  30 .B #define _GNU_SOURCE
  31 .br
  32 .B #include <unistd.h>
  33 .sp
  34 .BI "int getresuid(uid_t *" ruid ", uid_t *" euid ", uid_t *" suid );
  35 .br
  36 .BI "int getresgid(gid_t *" rgid ", gid_t *" egid ", gid_t *" sgid );
  37 .SH DESCRIPTION
  38 .B getresuid
  39 and
  40 .B getresgid
  41 (both introduced in Linux 2.1.44)
  42 get the real UID, effective UID, and saved set-user-ID (resp. group ID's)
  43 of the current process.
  44
  45 .SH "RETURN VALUE"
  46 On success, zero is returned.  On error, \-1 is returned, and
  47 .I errno
  48 is set appropriately.
  49 .SH ERRORS
  50 .TP
  51 .B EFAULT
  52 One of the arguments specified an address outside the calling program's
  53 address space.
  54 .SH "CONFORMING TO"
  55 This call is Linux-specific.
  56 The prototype is given by glibc since version 2.3.2
  57 provided _GNU_SOURCE is defined.
  58 .SH "SEE ALSO"
  59 .BR getuid (2),
  60 .BR setresuid (2),
  61 .BR setreuid (2),
  62 .BR setuid (2)